Do you need to know, when is the best time to go to Southeast? Then you should take a look here, what weather you can expect there during the year.
Southeast is part of China. The climate of China is very diverse, because the country is very large. Weather is tropical in south and subarctic in north, and alpine in the higher elevations of the Tibetan Plateau. Monsoon winds strongly influence the climate. During the summer the Monsoon carries warm and moist air from the south, during winter the monsoon brings cold and relatively dry weather.
When speaking about the usual weather in this area, the information is relevant for example for these popular places: Anxi, Baoting, Bo'ao, Changle, Chaozhou, Chongwu, Dabu, Danzhou, Dehua, Dongguan, Eastern Guangdong, Enping, Foshan, Fu'an, Fuding, Fujian, Fuqing, Fuzhou, Guangdong, Guangzhou, Gulangyu, Haicang, Haikou, Hainan, Houjie, Hui'an, Huizhou, Inland Fujian, Jiangmen, Jieyang, Jimei, Jinjiang, Kaiping, Liannan, Lingshui, Liu'ao, Longyan, Luoding, Maoming, Mawei, Meizhou, Mount Wuyi, Nanling National Forest Park, Nanping, Ningde, Northern Coast, Northern Guangdong, Panyu, Pearl River Delta, Pingtan, Putian, Qingyuan, Quanzhou, Sanming, Sanya, Shantou, Shaoguan, Shenzhen, Shishi, Shunde, Southern Coast, Taining, Taishan, Taxia, Tong'an, Wenchang, Western Guangdong, Wuzhishan, Xiamen, Xiang'an, Xiapu, Yangjiang, Yongding County, Zhangzhou, Zhanjiang, Zhaoqing, Zhongshan, Zhuhai.
Let's look now what weather you can expect in the area around Shenzhen and in many other cities. The warmest month here is August, the average maximum temperature is 33 ℃ (91.4 ℉). The average minimum temperature in this month is 26 ℃ (78.8 ℉). The coldest month here is January, the average maximum temperature is 20.1 ℃ (68.18 ℉). The average minimum temperature in this month is 12 ℃ (53.6 ℉). The most rainy month here is June, the average number of rainy days is 18.3. The least rainy month here is December, the average number of rainy days is 4.7. 
When travelling around Southeast, always consider the altitude of the the place as well. We should remind you, that the highest point in China is Mount Everest (8848 m) and the lowest point is Turpan Pendi (-154 m). So there are huge differences in altitudes in this country and the weather is very different in them therefore. Keep in mind, that the temperature usually decreases by 1.2 - 1.9 ℃ (2.2 - 3.5 ℉) per 200 m (656 ft), depending on the other conditions. (And we should add, that in the very special condition named thermal inversion even the temperature may be higher in higher altitudes.)
Typical (usual) weather in Southeast in January is this: The average highest temperature in Southeast in January is 20.1 ℃ (68.18 ℉). The average lowest temperature is 12 ℃ (53.6 ℉). At the beginning of January you can expect higher temperatures, the average highest temperature is around 21.1 ℃ (69.98 ℉). At the end of January you can expect higher temperatures, the average highest temperature is around 20.25 ℃ (68.45 ℉). The average number of rainy days in January is 6.3. The average rainfall is 30 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:46 (hours and minutes), in the middle of the month 10:54 and at the end of the month 11:07.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in February is this: The average highest temperature in Southeast in February is 20.4 ℃ (68.72 ℉). The average lowest temperature is 12.8 ℃ (55.04 ℉). At the beginning of February you can expect lower temperatures, the average highest temperature is around 20.25 ℃ (68.45 ℉). At the end of February you can expect higher temperatures, the average highest temperature is around 21.4 ℃ (70.52 ℉). The average number of rainy days in February is 9.6. The average rainfall is 43.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:07 (hours and minutes), in the middle of the month 11:23 and at the end of the month 11:42.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Southeast in March is this: The average highest temperature in Southeast in March is 22.4 ℃ (72.32 ℉). The average lowest temperature is 16 ℃ (60.8 ℉). At the beginning of March you can expect lower temperatures, the average highest temperature is around 21.4 ℃ (70.52 ℉). At the end of March you can expect higher temperatures, the average highest temperature is around 24.4 ℃ (75.92 ℉). The average number of rainy days in March is 10.5. The average rainfall is 68.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:42 (hours and minutes), in the middle of the month 12:01 and at the end of the month 12:21.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in April is this: The average highest temperature in Southeast in April is 26.4 ℃ (79.52 ℉). The average lowest temperature is 19.8 ℃ (67.64 ℉). At the beginning of April you can expect lower temperatures, the average highest temperature is around 24.4 ℃ (75.92 ℉). At the end of April you can expect higher temperatures, the average highest temperature is around 27.6 ℃ (81.68 ℉). The average number of rainy days in April is 12.6. The average rainfall is 173 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:21 (hours and minutes), in the middle of the month 12:40 and at the end of the month 12:58.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.
Typical (usual) weather in Southeast in May is this: The average highest temperature in Southeast in May is 28.8 ℃ (83.84 ℉). The average lowest temperature is 23.1 ℃ (73.58 ℉). At the beginning of May you can expect lower temperatures, the average highest temperature is around 27.6 ℃ (81.68 ℉). At the end of May you can expect higher temperatures, the average highest temperature is around 30.25 ℃ (86.45 ℉). The average number of rainy days in May is 15.5. The average rainfall is 239.1 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:58 (hours and minutes), in the middle of the month 13:13 and at the end of the month 13:24.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in June is this: The average highest temperature in Southeast in June is 31.7 ℃ (89.06 ℉). The average lowest temperature is 25.2 ℃ (77.36 ℉). At the beginning of June you can expect lower temperatures, the average highest temperature is around 30.25 ℃ (86.45 ℉). At the end of June you can expect higher temperatures, the average highest temperature is around 32.2 ℃ (89.96 ℉). The average number of rainy days in June is 18.3. The average rainfall is 297.4 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:24 (hours and minutes), in the middle of the month 13:30 and at the end of the month 13:30.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in July is this: The average highest temperature in Southeast in July is 32.7 ℃ (90.86 ℉). The average lowest temperature is 25.3 ℃ (77.54 ℉). At the beginning of July you can expect lower temperatures, the average highest temperature is around 32.2 ℃ (89.96 ℉). At the end of July you can expect higher temperatures, the average highest temperature is around 32.85 ℃ (91.13 ℉). The average number of rainy days in July is 17.1. The average rainfall is 334 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:30 (hours and minutes), in the middle of the month 13:23 and at the end of the month 13:12.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in August is this: The average highest temperature in Southeast in August is 33 ℃ (91.4 ℉). The average lowest temperature is 26 ℃ (78.8 ℉). At the beginning of August you can expect lower temperatures, the average highest temperature is around 32.85 ℃ (91.13 ℉). At the end of August you can expect lower temperatures, the average highest temperature is around 32.15 ℃ (89.87 ℉). The average number of rainy days in August is 17.9. The average rainfall is 377 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 13:12 (hours and minutes), in the middle of the month 12:57 and at the end of the month 12:39.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in September is this: The average highest temperature in Southeast in September is 31.3 ℃ (88.34 ℉). The average lowest temperature is 24.8 ℃ (76.64 ℉). At the beginning of September you can expect higher temperatures, the average highest temperature is around 32.15 ℃ (89.87 ℉). At the end of September you can expect lower temperatures, the average highest temperature is around 30.1 ℃ (86.18 ℉). The average number of rainy days in September is 14.7. The average rainfall is 234 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:39 (hours and minutes), in the middle of the month 12:20 and at the end of the month 12:01.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in October is this: The average highest temperature in Southeast in October is 28.9 ℃ (84.02 ℉). The average lowest temperature is 22.2 ℃ (71.96 ℉). At the beginning of October you can expect higher temperatures, the average highest temperature is around 30.1 ℃ (86.18 ℉). At the end of October you can expect lower temperatures, the average highest temperature is around 26.9 ℃ (80.42 ℉). The average number of rainy days in October is 7.3. The average rainfall is 97.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 12:01 (hours and minutes), in the middle of the month 11:42 and at the end of the month 11:23.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in November is this: The average highest temperature in Southeast in November is 24.9 ℃ (76.82 ℉). The average lowest temperature is 17.4 ℃ (63.32 ℉). At the beginning of November you can expect higher temperatures, the average highest temperature is around 26.9 ℃ (80.42 ℉). At the end of November you can expect lower temperatures, the average highest temperature is around 23.5 ℃ (74.3 ℉). The average number of rainy days in November is 5. The average rainfall is 38.2 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 11:23 (hours and minutes), in the middle of the month 11:07 and at the end of the month 10:54.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.Typical (usual) weather in Southeast in December is this: The average highest temperature in Southeast in December is 22.1 ℃ (71.78 ℉). The average lowest temperature is 13.1 ℃ (55.58 ℉). At the beginning of December you can expect higher temperatures, the average highest temperature is around 23.5 ℃ (74.3 ℉). At the end of December you can expect lower temperatures, the average highest temperature is around 21.1 ℃ (69.98 ℉). The average number of rainy days in December is 4.7. The average rainfall is 34.5 mm (look here, what this number means). When planning your travel, please, keep in mind, that actual weather may differ from these average values. The length of the day at the beginning of this month is approximately 10:54 (hours and minutes), in the middle of the month 10:46 and at the end of the month 10:45.These numbers above are valid primarily for the capital and the area around it. It is important to say, that the weather may differ significantly in different altitudes, especially in mountains.| Guangzhou | temperature: - | highest temperature: 20.8 ℃ (69.44 ℉) | lowest temperature: 11 ℃ (51.8 ℉) | rainfall: 24.3mm | rainy days: 5.1 |
| Fuzhou | temperature: - | highest temperature: 17.3 ℃ (63.14 ℉) | lowest temperature: 9.7 ℃ (49.46 ℉) | rainfall: 28.7mm | rainy days: 8.1 |
| Haikou | temperature: - | highest temperature: 22.6 ℃ (72.68 ℉) | lowest temperature: 16 ℃ (60.8 ℉) | rainfall: 34.3mm | rainy days: 8.2 |
| Xiamen | temperature: - | highest temperature: 19.7 ℃ (67.46 ℉) | lowest temperature: 12 ℃ (53.6 ℉) | rainfall: 25mm | rainy days: 4 |
| Sanya | temperature: - | highest temperature: 27.2 ℃ (80.96 ℉) | lowest temperature: 18.9 ℃ (66.02 ℉) | rainfall: 10.7mm | rainy days: 3.6 |
| Shantou | temperature: - | highest temperature: 20.2 ℃ (68.36 ℉) | lowest temperature: 12.5 ℃ (54.5 ℉) | rainfall: 38.5mm | rainy days: 5.2 |
| Shaoguan | temperature: - | highest temperature: 17.8 ℃ (64.04 ℉) | lowest temperature: 8.2 ℃ (46.76 ℉) | rainfall: 44.9mm | rainy days: 6.9 |
| Shenzhen | temperature: - | highest temperature: 22.1 ℃ (71.78 ℉) | lowest temperature: 13.1 ℃ (55.58 ℉) | rainfall: 34.5mm | rainy days: 4.7 |