Ya'an climate

Name: Ya'an
Address: CN

Ya'an is warmest in July, with average highs of 28 °C, and coldest in January, when nights average 2.1 °C. August is the wettest month (354 mm) and December the driest (44 mm). Figures are 1991–2020 climate normals.

Across a full year Ya'an averages 1,714 mm of rain, 97 days above 25 °C and 11 days below freezing.

China · population 612,056 · 1991–2020 normals

Temperature below 0 °C to above 30 °C Rain band height is that month’s share of the wettest month

Warmest month July 28 °C
Coldest month January 2.1 °C
Driest month December 44 mm
Wettest month August 354 mm
Least cloud December 76 % cloud
Hottest on record July 35 °C
Coldest on record January -8.2 °C

What to expectYa'an through the year

Ya'an has a clear annual cycle: average daily highs run from 8.2 °C in January to 28 °C in July, a swing of 19 °C in mean temperature across the year.

Counted across a normal year, 97 days a year reach 25 °C, 13 of them reach 30 °C, 11 nights drop below freezing. The warmest reading in the 1991–2020 record is 35 °C, in July.

Rain is strongly seasonal. August averages 354 mm against 44 mm in December — 8.1 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	8.2 °C	46 mm	78 %
February	10.8 °C	53 mm	80 %
March	15.1 °C	80 mm	80 %
April	20.2 °C	109 mm	79 %
May	23.5 °C	137 mm	80 %
June	26.1 °C	185 mm	83 %
July	27.8 °C	303 mm	80 %
August	27.4 °C	354 mm	78 %
September	23.5 °C	205 mm	84 %
October	18.8 °C	122 mm	86 %
November	14.6 °C	76 mm	82 %
December	9.7 °C	44 mm	76 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C	Days below 0 °C
January	8.2 °C	2.1 °C	5.1 °C	17.1 °C	-8.2 °C	0	0	6
February	10.8 °C	4.0 °C	7.4 °C	21.2 °C	-4.2 °C	0	0	3
March	15.1 °C	7.6 °C	11.6 °C	28.1 °C	-0.5 °C	0	0	0
April	20.2 °C	12.6 °C	16.5 °C	31.1 °C	3.1 °C	4	0	0
May	23.5 °C	16.7 °C	20.0 °C	32.8 °C	8.1 °C	11	0	0
June	26.1 °C	19.9 °C	22.8 °C	33.1 °C	13.2 °C	20	2	0
July	27.8 °C	21.6 °C	24.6 °C	35.2 °C	14.8 °C	27	5	0
August	27.4 °C	21.3 °C	24.1 °C	34.1 °C	14.9 °C	24	6	0
September	23.5 °C	18.6 °C	20.8 °C	31.3 °C	13.0 °C	10	0	0
October	18.8 °C	14.3 °C	16.4 °C	28.0 °C	7.4 °C	1	0	0
November	14.6 °C	9.4 °C	11.9 °C	22.1 °C	0.7 °C	0	0	0
December	9.7 °C	3.9 °C	6.7 °C	17.0 °C	-7.8 °C	0	0	3

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	46 mm	13	10 h/day	78 %	81 %	6.3 km/h
February	53 mm	13	11 h/day	80 %	81 %	6.8 km/h
March	80 mm	15	12 h/day	80 %	79 %	7.2 km/h
April	109 mm	14	13 h/day	79 %	78 %	7.2 km/h
May	137 mm	16	14 h/day	80 %	77 %	6.8 km/h
June	185 mm	17	14 h/day	83 %	81 %	6.3 km/h
July	303 mm	22	14 h/day	80 %	84 %	6.3 km/h
August	354 mm	22	13 h/day	78 %	84 %	6.4 km/h
September	205 mm	20	12 h/day	84 %	85 %	6.2 km/h
October	122 mm	20	11 h/day	86 %	84 %	6.0 km/h
November	76 mm	15	11 h/day	82 %	83 %	6.4 km/h
December	44 mm	12	10 h/day	76 %	81 %	6.2 km/h

How Ya'an compares

The same four figures for nearby destinations, so the numbers above have something to be read against. Summer high is the warmest month's average high; winter low is the coldest month's average low.

Destination	Summer high	Winter low	Rain per year	Days above 25 °C
Ya'an	28 °C	2.1 °C	1,714 mm	97
Meishan · China	30 °C	3.3 °C	1,158 mm	137
Leshan · China	30 °C	3.9 °C	1,239 mm	135
Chengdu · China	30 °C	2.6 °C	1,055 mm	137
Ziyang · China	30 °C	3.6 °C	1,058 mm	141
Deyang · China	30 °C	2.3 °C	956 mm	128
Zigong · China	31 °C	4.5 °C	1,099 mm	143

Planning a trip? See the best time to visit Ya'an.

QuestionsCommon questions about Ya'an’s climate

When is the best time to visit Ya'an?

That depends on what you want, so the honest answer is a comparison rather than a single month. May, June, September sit closest to 20 °C on average, July is the warmest month and December the driest. The month-by-month table above has the full picture.

How hot does Ya'an get?

In July, the warmest month, daily highs average 28 °C. About 13 days a year pass 30 °C. The highest value in the 1991–2020 record is 35 °C.

How cold does it get in winter?

Nights average 2.1 °C in January, the coldest month. A normal year has 11 nights below freezing.

Which month is wettest in Ya'an?

August, averaging 354 mm over 22 days with rain. The driest month is December with 44 mm. The year as a whole averages 1,714 mm.

Are these figures a forecast?

No. They are 1991–2020 climate normals: the average of thirty years, which describes what a month is usually like in Ya'an rather than what any particular week will bring. Individual years can differ substantially from the normal.

Data sources and method

ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
Open-Meteo — Open-Meteo.com. CC BY 4.0
NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
GeoNames — GeoNames.org. CC BY 4.0

Normal period: 1991–2020
Dataset version: era5-1991-2020-scores1.1
Last processed: 1 August 2026

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: monthly rankings, daylight hours, beach and comfort scores. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.