Weather in Guangzhou

Guangzhou is in China at 23.1°N. The 2001–2020 NASA POWER daily record describes a humid subtropical climate. Rain is wet season runs from March to September, inside an annual total of 1730 mm. The wettest month is June at 332 mm; the driest is December at 30 mm.

July is the warmest month (average 28.6°C, high 31.7°C) and January is the coolest (average 14.6°C, low 8.8°C). From the coolest night in January (8.8°C) to the hottest afternoon in July (31.7°C), the raw range is 22.9°C. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are March, November, and December.

Rainfall pattern

The wet season in Guangzhou starts in March and ends in September (March, April, May, June, July, August, and September). June is the core of it at 332 mm. December is the other extreme, with 30 mm.

A rainy day here is a day with at least 1 mm in the NASA POWER series. June averages 23 such days; December averages 5.

Hot and cool months in Guangzhou

Monthly average highs run from 20.5°C in January to 31.7°C in July. Nights follow the same curve: 8.8°C in January and 25.4°C in July.

Mean high across all twelve months is 27.6°C and mean low is 18.4°C. These are 20-year grid averages, so a city station can read a few degrees warmer or cooler.

What stands out month by month

January is the coolest month, with lows around 8.8°C and highs near 20.5°C. Rainfall is 49 mm. March is when the wet season typically starts in Guangzhou: highs near 26.1°C, and rainfall jumps to 96 mm (12 rainy days). April: 29.1°C high, 19.3°C low, 152 mm rain, 78% humidity. In May, Guangzhou averages 30.7°C by day and 22.9°C at night, with 298 mm of rain. June is the wettest month — 332 mm and 23 rainy days, with 88% humidity.

Peak heat arrives in July: 31.7°C by day, 25.4°C at night, and 87% humidity. September closes the wet season: 178 mm over 16 rainy days, then the calendar dries. In October, Guangzhou averages 29.0°C by day and 19.3°C at night, with 56 mm of rain. November: 26.3°C high, 14.8°C low, 42 mm rain, 73% humidity. December is the driest month, averaging only 30 mm across 5 rainy days. Highs sit near 21.5°C.

Best months to visit Guangzhou

The three months with the highest comfort score are March, November, and December: March (20.6°C average, 96 mm, 74% humidity); November (20.5°C average, 42 mm, 73% humidity); December (15.5°C average, 30 mm, 67% humidity). They fall in calendar order. The score rewards averages near 22°C, lower rainfall, and humidity near 60%. It is a climate score, not a festival or price calendar.

If you want the wet season itself — fewer crowds, greener landscape, heavier rain — aim at March–September instead of the score.

How Guangzhou compares inside China

Dongguan is about 52 km away: Guangzhou is about as warm as Dongguan at the hot peak and 96 mm wetter over the year than Dongguan. Dongguan’s wettest month is June (325 mm) versus June here.

Wuhan is about 836 km away: Guangzhou is 0.5°C cooler than Wuhan in its hottest month and 398 mm wetter over the year than Wuhan. Wuhan’s wettest month is July (222 mm) versus June here.

Chongqing is about 978 km away: Guangzhou is about as warm as Chongqing at the hot peak and 587 mm wetter over the year than Chongqing. Chongqing’s wettest month is June (205 mm) versus June here.