Weather in Xi’an

Xi’an is in China at 34.3°N. The 2001–2020 NASA POWER daily record describes a continental climate with a wide temperature swing. Rain is wet season runs from June to September, inside an annual total of 692 mm. The wettest month is September at 125 mm; the driest is December at 6 mm.

July is the warmest month (average 27.6°C, high 33.5°C) and January is the coolest (average 0.9°C, low -3.9°C). From the coolest night in January (-3.9°C) to the hottest afternoon in July (33.5°C), the raw range is 37.4°C. On this site the months that score closest to a 22°C day, lighter rain, and moderate humidity are April, May, and September.

Rainfall pattern

The wet season in Xi’an starts in June and ends in September (June, July, August, and September). September is the core of it at 125 mm. December is the other extreme, with 6 mm.

Humidity peaks near 69%. That usually lines up with the wetter months rather than the hottest ones.

How warm Xi’an gets

The heat peaks in July, when the typical afternoon is 33.5°C. The opposite pole is January, when mornings average -3.9°C.

Across the year the mean afternoon high is 20.9°C. If you want the smallest day–night shock, look at months where the high and low sit close together; July nights still hold 21.8°C.

What stands out month by month

The year bottoms out in January. Plan for -3.9°C at night and 5.7°C in the afternoon. February stands apart from the months beside it: 10.2°C / -1.2°C and 13 mm. March brings 23 mm and 5 rainy days; temperatures run from 3.3°C to 17.1°C. In April, Xi’an averages 23.7°C by day and 9.2°C at night, with 40 mm of rain. May: 28.4°C high, 14.3°C low, 69 mm rain, 51% humidity. June is when the wet season typically starts in Xi’an: highs near 32.6°C, and rainfall jumps to 84 mm (10 rainy days).

Peak heat arrives in July: 33.5°C by day, 21.8°C at night, and 61% humidity. In August, Xi’an averages 32.0°C by day and 20.8°C at night, with 114 mm of rain. By September the wet season is ending. Xi’an still sees about 125 mm, but the next month is usually leaner. October brings 60 mm and 10 rainy days; temperatures run from 9.5°C to 20.6°C. November stands apart from the months beside it: 13.8°C / 2.4°C and 27 mm. December is the driest month, averaging only 6 mm across 2 rainy days. Highs sit near 7.0°C.

When the score favours a visit

The three months with the highest comfort score are April, May, and September: April (16.4°C average, 40 mm, 52% humidity); May (21.3°C average, 69 mm, 51% humidity); September (20.9°C average, 125 mm, 69% 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 June–September instead of the score.

Xi’an and other cities in China

Wuzhong is about 481 km away: Xi’an is 2.2°C warmer than Wuzhong in its hottest month and 463 mm wetter over the year than Wuzhong. Wuzhong’s wettest month is August (50 mm) versus September here.

Chongqing is about 568 km away: Xi’an is 0.8°C cooler than Chongqing in its hottest month and 450 mm drier over the year than Chongqing. Chongqing’s wettest month is June (205 mm) versus September here.

Chengdu is about 606 km away: Xi’an is about as warm as Chengdu at the hot peak and 298 mm drier over the year than Chengdu. Chengdu’s wettest month is July (224 mm) versus September here.