Sanmenxia climate

Name: Sanmenxia
Address: CN

Sanmenxia is warmest in July, with average highs of 31 °C, and coldest in January, when nights average -4.3 °C. July is the wettest month (120 mm) and December the driest (8.9 mm). Figures are 1991–2020 climate normals.

Across a full year Sanmenxia averages 642 mm of rain, 133 days above 25 °C and 87 days below freezing.

China · population 669,307 · 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 31 °C
Coldest month January -4.3 °C
Driest month December 9 mm
Wettest month July 120 mm
Least cloud December 41 % cloud
Hottest on record June 41 °C
Coldest on record December -18 °C

What to expectSanmenxia through the year

Sanmenxia has a clear annual cycle: average daily highs run from 5.0 °C in January to 31 °C in July, a swing of 27 °C in mean temperature across the year.

Counted across a normal year, 133 days a year reach 25 °C, 67 of them reach 30 °C, 87 nights drop below freezing. The warmest reading in the 1991–2020 record is 41 °C, in June.

Rain is strongly seasonal. July averages 120 mm against 9 mm in December — 13 times as much. Planning around the dry months matters more here than planning around temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	5.0 °C	10 mm	46 %
February	8.8 °C	16 mm	53 %
March	15.2 °C	24 mm	57 %
April	21.9 °C	41 mm	57 %
May	26.7 °C	53 mm	63 %
June	30.8 °C	72 mm	60 %
July	31.3 °C	120 mm	63 %
August	29.5 °C	111 mm	60 %
September	24.9 °C	100 mm	61 %
October	19.5 °C	56 mm	56 %
November	12.5 °C	31 mm	47 %
December	6.2 °C	9 mm	41 %

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	5.0 °C	-4.3 °C	-0.0 °C	17.6 °C	-14.4 °C	0	0	29
February	8.8 °C	-1.6 °C	3.4 °C	21.8 °C	-16.6 °C	0	0	20
March	15.2 °C	3.7 °C	9.3 °C	29.4 °C	-7.7 °C	1	0	5
April	21.9 °C	10.2 °C	15.8 °C	36.0 °C	-1.7 °C	9	1	0
May	26.7 °C	15.4 °C	20.8 °C	37.6 °C	5.4 °C	21	8	0
June	30.8 °C	20.0 °C	25.3 °C	40.7 °C	11.9 °C	27	19	0
July	31.3 °C	22.5 °C	26.6 °C	40.4 °C	14.9 °C	29	21	0
August	29.5 °C	21.3 °C	25.0 °C	39.5 °C	13.0 °C	27	14	0
September	24.9 °C	16.5 °C	20.4 °C	37.3 °C	7.9 °C	16	3	0
October	19.5 °C	10.5 °C	14.7 °C	32.9 °C	-0.3 °C	3	0	0
November	12.5 °C	3.2 °C	7.6 °C	24.2 °C	-11.1 °C	0	0	6
December	6.2 °C	-2.8 °C	1.3 °C	16.5 °C	-17.8 °C	0	0	26

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind
January	10 mm	3	10 h/day	46 %	56 %	14 km/h
February	16 mm	3	11 h/day	53 %	59 %	15 km/h
March	24 mm	5	12 h/day	57 %	57 %	16 km/h
April	41 mm	6	13 h/day	57 %	56 %	17 km/h
May	53 mm	7	14 h/day	63 %	58 %	16 km/h
June	72 mm	7	14 h/day	60 %	62 %	15 km/h
July	120 mm	12	14 h/day	63 %	74 %	14 km/h
August	111 mm	11	13 h/day	60 %	76 %	14 km/h
September	100 mm	9	12 h/day	61 %	74 %	13 km/h
October	56 mm	7	11 h/day	56 %	69 %	13 km/h
November	31 mm	5	10 h/day	47 %	66 %	14 km/h
December	9 mm	2	9.8 h/day	41 %	59 %	15 km/h

How Sanmenxia 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
Sanmenxia	31 °C	-4.3 °C	642 mm	133
Yuncheng · China	32 °C	-4.0 °C	499 mm	142
Changzhi · China	31 °C	-4.7 °C	611 mm	128
Yongji · China	33 °C	-3.8 °C	680 mm	144
Huayin · China	32 °C	-3.0 °C	994 mm	145
Luoyang · China	32 °C	-4.3 °C	686 mm	148
Jiyuan · China	32 °C	-4.7 °C	646 mm	146

Where Sanmenxia ranks

Ranking	Position	Value
Places with the best weather in Asia in April	23rdof 50	95/100
Places with the best weather in the world in April	47thof 50	95/100

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

QuestionsCommon questions about Sanmenxia’s climate

When is the best time to visit Sanmenxia?

That depends on what you want, so the honest answer is a comparison rather than a single month. April, May, 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 Sanmenxia get?

In July, the warmest month, daily highs average 31 °C. About 67 days a year pass 30 °C. The highest value in the 1991–2020 record is 41 °C.

How cold does it get in winter?

Nights average -4.3 °C in January, the coldest month. A normal year has 87 nights below freezing.

Which month is wettest in Sanmenxia?

July, averaging 120 mm over 12 days with rain. The driest month is December with 9 mm. The year as a whole averages 642 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 Sanmenxia 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.