Rui’an climate

Name: Rui’an
Address: CN

Rui’an is warmest in July, with average highs of 30 °C, and coldest in January, when nights average 5.4 °C. June is the wettest month (284 mm) and December the driest (50 mm). Figures are 1991–2020 climate normals.

Across a full year Rui’an averages 1,672 mm of rain, 130 days above 25 °C and 2 days below freezing.

China · population 927,383 · 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 30 °C
Coldest month January 5.4 °C
Driest month December 50 mm
Wettest month June 284 mm
Least cloud October 51 % cloud
Hottest on record August 36 °C
Coldest on record February -4.7 °C
Warmest sea August 28 °C

What to expectRui’an through the year

Rui’an has a clear annual cycle: average daily highs run from 12 °C in January to 30 °C in July, a swing of 19 °C in mean temperature across the year.

Counted across a normal year, 130 days a year reach 25 °C, 38 of them reach 30 °C, 2 nights drop below freezing. The warmest reading in the 1991–2020 record is 36 °C, in August.

Rain is strongly seasonal. June averages 284 mm against 50 mm in December — 5.6 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Rui’an is warmest in August at 28 °C and coldest in February at 13 °C. Sea temperature lags the air by a month or two, which is why late summer swims warmer than early summer at the same air temperature.

Month by month

Month	Avg high	Rainfall	Cloud
January	11.8 °C	56 mm	60 %
February	12.7 °C	63 mm	67 %
March	15.3 °C	110 mm	72 %
April	19.6 °C	124 mm	76 %
May	23.7 °C	184 mm	79 %
June	27.0 °C	284 mm	88 %
July	30.0 °C	201 mm	75 %
August	30.0 °C	266 mm	70 %
September	27.5 °C	181 mm	65 %
October	23.6 °C	80 mm	51 %
November	19.1 °C	72 mm	58 %
December	14.0 °C	50 mm	52 %

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	11.8 °C	5.4 °C	8.6 °C	21.5 °C	-3.9 °C	0	0	1
February	12.7 °C	6.5 °C	9.5 °C	23.8 °C	-4.7 °C	0	0	0
March	15.3 °C	9.4 °C	12.2 °C	24.4 °C	0.3 °C	0	0	0
April	19.6 °C	13.9 °C	16.5 °C	28.3 °C	5.6 °C	1	0	0
May	23.7 °C	18.8 °C	21.1 °C	31.9 °C	10.2 °C	10	0	0
June	27.0 °C	22.9 °C	24.7 °C	33.7 °C	14.7 °C	23	4	0
July	30.0 °C	25.8 °C	27.7 °C	34.7 °C	19.8 °C	31	16	0
August	30.0 °C	25.7 °C	27.6 °C	35.8 °C	21.0 °C	31	15	0
September	27.5 °C	22.7 °C	24.9 °C	34.9 °C	13.7 °C	26	3	0
October	23.6 °C	17.8 °C	20.6 °C	31.1 °C	8.7 °C	8	0	0
November	19.1 °C	13.1 °C	16.0 °C	27.6 °C	2.8 °C	1	0	0
December	14.0 °C	7.3 °C	10.6 °C	24.0 °C	-4.6 °C	0	0	1

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	56 mm	9	11 h/day	60 %	74 %	12 km/h	14.3 °C
February	63 mm	10	11 h/day	67 %	78 %	12 km/h	13.3 °C
March	110 mm	14	12 h/day	72 %	81 %	12 km/h	13.9 °C
April	124 mm	14	13 h/day	76 %	83 %	12 km/h	16.3 °C
May	184 mm	16	14 h/day	79 %	86 %	12 km/h	20.6 °C
June	284 mm	19	14 h/day	88 %	89 %	13 km/h	24.2 °C
July	201 mm	19	14 h/day	75 %	88 %	15 km/h	27.0 °C
August	266 mm	22	13 h/day	70 %	87 %	14 km/h	28.1 °C
September	181 mm	15	12 h/day	65 %	81 %	13 km/h	26.9 °C
October	80 mm	8	12 h/day	51 %	76 %	13 km/h	23.2 °C
November	72 mm	8	11 h/day	58 %	76 %	12 km/h	19.6 °C
December	50 mm	7	10 h/day	52 %	72 %	12 km/h	16.2 °C

How Rui’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
Rui’an	30 °C	5.4 °C	1,672 mm	130
Wenzhou · China	30 °C	4.5 °C	1,749 mm	138
Fuding · China	32 °C	5.3 °C	1,808 mm	156
Lishui · China	33 °C	3.0 °C	1,429 mm	163
Taizhou · China	32 °C	3.5 °C	1,540 mm	143
Fu’an · China	33 °C	5.6 °C	1,601 mm	176
Guli · China	33 °C	2.1 °C	1,537 mm	158

Planning a trip? See the best time to visit Rui’an.

QuestionsCommon questions about Rui’an’s climate

When is the best time to visit Rui’an?

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

In July, the warmest month, daily highs average 30 °C. About 38 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 5.4 °C in January, the coldest month. A normal year has 2 nights below freezing.

Which month is wettest in Rui’an?

June, averaging 284 mm over 19 days with rain. The driest month is December with 50 mm. The year as a whole averages 1,672 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 Rui’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
Data point: 27.776°, 120.659° (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.