Kaiyuan climate

Name: Kaiyuan
Address: CN

Kaiyuan is warmest in May, with average highs of 28 °C, and coldest in January, when nights average 8.1 °C. July is the wettest month (178 mm) and February the driest (11 mm). Figures are 1991–2020 climate normals.

Across a full year Kaiyuan averages 844 mm of rain, 192 days above 25 °C and 1 days below freezing.

China · population 198,423 · 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 May 28 °C
Coldest month January 8.1 °C
Driest month February 11 mm
Wettest month July 178 mm
Least cloud March 41 % cloud
Hottest on record May 36 °C
Coldest on record December -6.1 °C

What to expectKaiyuan through the year

Kaiyuan has a clear annual cycle: average daily highs run from 19 °C in January to 28 °C in May, a swing of 11 °C in mean temperature across the year.

Counted across a normal year, 192 days a year reach 25 °C, 34 of them reach 30 °C, 1 nights drop below freezing. The warmest reading in the 1991–2020 record is 36 °C, in May.

Rain is strongly seasonal. July averages 178 mm against 11 mm in February — 16 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	18.6 °C	19 mm	52 %
February	21.5 °C	11 mm	43 %
March	25.5 °C	22 mm	41 %
April	27.9 °C	33 mm	45 %
May	28.5 °C	82 mm	61 %
June	28.1 °C	130 mm	85 %
July	27.0 °C	178 mm	86 %
August	26.8 °C	176 mm	80 %
September	25.7 °C	103 mm	72 %
October	23.6 °C	52 mm	65 %
November	21.2 °C	22 mm	52 %
December	18.4 °C	15 mm	54 %

Temperature month by month

Month	Avg high	Avg low	Mean	Record high	Record low	Days above 25 °C	Days above 30 °C
January	18.6 °C	8.1 °C	13.0 °C	27.8 °C	-2.8 °C	1	0
February	21.5 °C	9.7 °C	15.3 °C	30.7 °C	-0.3 °C	7	0
March	25.5 °C	13.0 °C	19.0 °C	33.0 °C	2.9 °C	20	3
April	27.9 °C	16.2 °C	21.7 °C	35.2 °C	5.7 °C	24	10
May	28.5 °C	18.6 °C	23.1 °C	36.1 °C	11.3 °C	26	11
June	28.1 °C	20.1 °C	23.6 °C	35.3 °C	14.5 °C	27	6
July	27.0 °C	19.9 °C	23.0 °C	32.9 °C	15.0 °C	26	2
August	26.8 °C	19.4 °C	22.7 °C	32.5 °C	13.0 °C	26	1
September	25.7 °C	18.0 °C	21.5 °C	31.5 °C	10.7 °C	21	1
October	23.6 °C	15.6 °C	19.2 °C	29.5 °C	9.0 °C	12	0
November	21.2 °C	11.5 °C	16.0 °C	28.2 °C	3.6 °C	3	0
December	18.4 °C	8.3 °C	13.0 °C	26.9 °C	-6.1 °C	0	0

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	19 mm	3	11 h/day	52 %	73 %	15 km/h
February	11 mm	2	11 h/day	43 %	66 %	17 km/h
March	22 mm	4	12 h/day	41 %	62 %	19 km/h
April	33 mm	6	13 h/day	45 %	63 %	18 km/h
May	82 mm	11	13 h/day	61 %	68 %	15 km/h
June	130 mm	16	14 h/day	85 %	77 %	12 km/h
July	178 mm	20	13 h/day	86 %	81 %	10 km/h
August	176 mm	20	13 h/day	80 %	82 %	9.0 km/h
September	103 mm	15	12 h/day	72 %	79 %	9.3 km/h
October	52 mm	9	12 h/day	65 %	77 %	10 km/h
November	22 mm	3	11 h/day	52 %	74 %	12 km/h
December	15 mm	2	11 h/day	54 %	73 %	12 km/h

How Kaiyuan 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
Kaiyuan	28 °C	8.1 °C	844 mm	192
Mengzi · China	27 °C	8.2 °C	1,403 mm	148
Wenshan City · China	27 °C	7.4 °C	1,099 mm	145
Kunming · China	25 °C	4.9 °C	1,463 mm	55
Qujing · China	23 °C	2.7 °C	1,276 mm	40
Jianshui · China	24 °C	4.5 °C	1,888 mm	45
Xingyi · China	27 °C	4.2 °C	1,474 mm	137

Where Kaiyuan ranks

Ranking	Position	Value
Places with the best weather in Asia year-round	15th of 50	81/100
Places with the best weather in Asia in March	34th of 50	92/100

Planning a trip? See the best time to visit Kaiyuan.

QuestionsCommon questions about Kaiyuan’s climate

When is the best time to visit Kaiyuan?

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

How hot does Kaiyuan get?

In May, the warmest month, daily highs average 28 °C. About 34 days a year pass 30 °C. The highest value in the 1991–2020 record is 36 °C.

How cold does it get in winter?

Nights average 8.1 °C in January, the coldest month. A normal year has 1 nights below freezing.

Which month is wettest in Kaiyuan?

July, averaging 178 mm over 20 days with rain. The driest month is February with 11 mm. The year as a whole averages 844 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 Kaiyuan 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
Data point: 23.698°, 103.304° (the coordinates the reanalysis values are taken for)
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.