Hwaseong-si climate

Name: Hwaseong-si
Address: KR

Hwaseong-si is warmest in August, with average highs of 27 °C, and coldest in January, when nights average -4.4 °C. July is the wettest month (301 mm) and January the driest (22 mm). Figures are 1991–2020 climate normals.

Across a full year Hwaseong-si averages 1,224 mm of rain, 68 days above 25 °C and 87 days below freezing.

South Korea · population 640,890 · 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 August 27 °C
Coldest month January -4.4 °C
Driest month January 22 mm
Wettest month July 301 mm
Least cloud October 44 % cloud
Hottest on record August 37 °C
Coldest on record January -17 °C
Warmest sea August 23 °C

What to expectHwaseong-si through the year

Hwaseong-si has a clear annual cycle: average daily highs run from 1.6 °C in January to 27 °C in August, a swing of 26 °C in mean temperature across the year.

Counted across a normal year, 68 days a year reach 25 °C, 6 of them reach 30 °C, 87 nights drop below freezing. The warmest reading in the 1991–2020 record is 37 °C, in August.

Rain is strongly seasonal. July averages 301 mm against 22 mm in January — 14 times as much. Planning around the dry months matters more here than planning around temperature.

The sea off Hwaseong-si is warmest in August at 23 °C and coldest in February at 4.0 °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	1.6 °C	22 mm	55 %
February	3.7 °C	30 mm	49 %
March	8.4 °C	41 mm	48 %
April	14.2 °C	78 mm	50 %
May	19.4 °C	105 mm	54 %
June	23.6 °C	134 mm	64 %
July	26.4 °C	301 mm	71 %
August	27.5 °C	244 mm	62 %
September	23.9 °C	127 mm	54 %
October	18.2 °C	60 mm	44 %
November	10.8 °C	55 mm	49 %
December	3.9 °C	28 mm	51 %

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	1.6 °C	-4.4 °C	-1.3 °C	13.6 °C	-16.6 °C	0	0	28
February	3.7 °C	-2.6 °C	0.4 °C	15.8 °C	-16.1 °C	0	0	23
March	8.4 °C	1.5 °C	4.7 °C	19.8 °C	-6.7 °C	0	0	10
April	14.2 °C	6.9 °C	10.3 °C	25.2 °C	-0.5 °C	0	0	0
May	19.4 °C	12.3 °C	15.6 °C	30.4 °C	5.6 °C	1	0	0
June	23.6 °C	17.4 °C	20.2 °C	30.5 °C	11.6 °C	8	0	0
July	26.4 °C	21.8 °C	23.8 °C	35.1 °C	16.8 °C	22	2	0
August	27.5 °C	22.7 °C	24.9 °C	36.6 °C	15.4 °C	27	4	0
September	23.9 °C	18.1 °C	20.9 °C	31.1 °C	10.5 °C	10	0	0
October	18.2 °C	11.6 °C	14.8 °C	26.8 °C	0.7 °C	0	0	0
November	10.8 °C	4.4 °C	7.7 °C	21.7 °C	-8.5 °C	0	0	4
December	3.9 °C	-2.2 °C	1.0 °C	14.8 °C	-12.1 °C	0	0	22

Rain, sun and wind month by month

Month	Rainfall	Wet days	Daylight	Cloud cover	Humidity	Wind	Sea temp
January	22 mm	4	9.9 h/day	55 %	64 %	22 km/h	5.6 °C
February	30 mm	4	11 h/day	49 %	65 %	22 km/h	4.0 °C
March	41 mm	6	12 h/day	48 %	70 %	22 km/h	4.8 °C
April	78 mm	7	13 h/day	50 %	72 %	22 km/h	7.8 °C
May	105 mm	7	14 h/day	54 %	76 %	20 km/h	11.7 °C
June	134 mm	8	15 h/day	64 %	81 %	18 km/h	16.4 °C
July	301 mm	15	14 h/day	71 %	87 %	19 km/h	20.6 °C
August	244 mm	14	14 h/day	62 %	84 %	18 km/h	23.4 °C
September	127 mm	8	12 h/day	54 %	76 %	18 km/h	23.1 °C
October	60 mm	6	11 h/day	44 %	70 %	19 km/h	19.9 °C
November	55 mm	7	10 h/day	49 %	69 %	21 km/h	15.2 °C
December	28 mm	6	9.6 h/day	51 %	66 %	22 km/h	9.7 °C

How Hwaseong-si 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
Hwaseong-si	27 °C	-4.4 °C	1,224 mm	68
Suwon · South Korea	28 °C	-6.2 °C	1,146 mm	93
Gunpo · South Korea	28 °C	-6.1 °C	1,139 mm	85
Anyang-si · South Korea	28 °C	-6.1 °C	1,209 mm	84
Osan · South Korea	29 °C	-5.8 °C	1,148 mm	100
Incheon · South Korea	28 °C	-6.1 °C	1,152 mm	71
Bucheon-si · South Korea	28 °C	-6.4 °C	1,153 mm	83

Planning a trip? See the best time to visit Hwaseong-si.

QuestionsCommon questions about Hwaseong-si’s climate

When is the best time to visit Hwaseong-si?

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

How hot does Hwaseong-si get?

In August, the warmest month, daily highs average 27 °C. About 6 days a year pass 30 °C. The highest value in the 1991–2020 record is 37 °C.

How cold does it get in winter?

Nights average -4.4 °C in January, the coldest month. A normal year has 87 nights below freezing.

Which month is wettest in Hwaseong-si?

July, averaging 301 mm over 15 days with rain. The driest month is January with 22 mm. The year as a whole averages 1,224 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 Hwaseong-si 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: 37.207°, 126.817° (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.