Itoshima climate — normals and trends

Q: What is the climate of Itoshima?

Itoshima has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.5 °C and it receives 1,636 mm of precipitation per year.

Q: What is the hottest day ever recorded in Itoshima?

The hottest day measured in Itoshima between 1940 and 2025 was 19 September 2024, reaching 36.4 °C.

Q: What is the coldest day in Itoshima?

The coldest day measured in Itoshima between 1940 and 2025 was 18 February 1968, at -6.2 °C.

Q: Does it snow in Itoshima?

Yes. Itoshima gets on average 8.4 cm of snow per year and has around 2 frost days.

Q: Has the climate of Itoshima warmed?

Yes: Itoshima warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Itoshima?

The wettest day measured in Itoshima between 1940 and 2025 was 24 June 2012, with 179 mm of rain in 24 hours.

Q: What was the windiest day in Itoshima?

The windiest day measured in Itoshima between 1940 and 2025 was 10 September 1956, with winds reaching 60.2 km/h.

Q: What is the warmest month in Itoshima?

The warmest month in Itoshima is August (27.5 °C on average); the coldest is January (6.3 °C).

Q: How much does it rain in Itoshima?

Itoshima receives on average 1,636 mm of precipitation per year, spread over about 146 rainy days.

Q: Is it sunny in Itoshima?

Itoshima gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.

Itoshima (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.5 °C and it receives 1,636 mm of precipitation per year.

These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.

The warmest month is August (27.5 °C on average) and the coldest is January (6.3 °C). Rainfall peaks in June.

Itoshima averages 2 frost days, 34 hot days (≥ 30 °C) and 146 rainy days per year.

Itoshima has warmed by +2.6 °C between 1940 and 2025, or +0.31 °C per decade. This trend is statistically significant.

The number of frost days there went from about 4 to 0 per year over the period.

The hottest day of the period reached 36.4 °C (on 19 September 2024) and the coldest -6.2 °C (on 18 February 1968).

Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.

Climate normals · ERA5

ItoshimaFukuoka

coords: 33.54°, 130.18°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJuneDriest monthDecember

Mean daily temperature

16.5°C

Average daily high

19.3°C

Average daily low

13.9°C

Annual rainfall

1,636mm

Sunshine / day

8.1h

Mean relative humidity

75%

Average peak wind

15.3km/h

Seasonal range

21.2°C

Frost days (< 0 °C)

2 d/yr

Hot days (≥ 30 °C)

34 d/yr

Rainy days (≥ 1 mm)

146 d/yr

Annual snowfall

8.4 cm

Average feels-like high

19.6 °C

Average feels-like low

13.4 °C

Average peak gust

37.4 km/h

Tropical nights (≥ 20 °C)

102 d/yr

Solar radiation

14.1 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.6 °C

since 1940

+0.3 °C per decade · r² = 0.75 · p = < 0.001

19402025

Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).

A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.

Records for the period

Hottest day

36.4 °C

19 September 2024

Coldest day

-6.2 °C

18 February 1968

Wettest day

179 mm

24 June 2012

Windiest day

60.2 km/h

10 September 1956

Strongest gust

202.3 km/h

31 August 1987

Hottest feels-like

43.9 °C

5 August 2024

Coldest feels-like

-11.7 °C

16 February 1977

Snowiest day

26.3 cm

15 February 1968

Sunniest day

13.8 h

2 June 1942

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	34.6 °C24 July 2025	-1.0 °C10 January 2025	17.5 °C	1,549 mm	73	3
2024	36.4 °C19 September 2024	0.9 °C24 January 2024	18.5 °C	1,868 mm	71	0
2023	34.7 °C3 August 2023	-2.2 °C24 January 2023	18.1 °C	1,680 mm	55	3
2022	34.6 °C2 July 2022	0.4 °C17 February 2022	17.7 °C	1,262 mm	55	0
2021	34.6 °C5 August 2021	-1.3 °C8 January 2021	17.9 °C	2,027 mm	44	3
2020	35.3 °C25 August 2020	0.6 °C31 December 2020	17.7 °C	1,938 mm	38	0
2019	35.2 °C3 August 2019	3.1 °C27 January 2019	17.8 °C	1,607 mm	38	0
2018	36.1 °C14 August 2018	-0.7 °C6 February 2018	17.4 °C	1,495 mm	57	3
2017	33.9 °C4 August 2017	1.3 °C25 January 2017	17.3 °C	1,496 mm	49	0
2016	34.2 °C6 August 2016	-2.5 °C24 January 2016	17.9 °C	2,078 mm	50	2
2015	33.9 °C7 August 2015	0.8 °C9 February 2015	17.2 °C	2,021 mm	25	0
2014	35.1 °C30 July 2014	1.3 °C22 January 2014	17.0 °C	1,634 mm	14	0
2013	34.1 °C18 August 2013	-1.5 °C8 February 2013	17.5 °C	1,611 mm	54	1
2012	34.8 °C31 July 2012	-0.9 °C2 February 2012	16.9 °C	1,813 mm	44	2
2011	34.6 °C12 July 2011	-2.2 °C16 January 2011	17.1 °C	1,648 mm	53	3
2010	34.9 °C6 August 2010	0.6 °C13 January 2010	17.4 °C	1,599 mm	53	0
2009	33.1 °C7 August 2009	-0.5 °C24 January 2009	17.4 °C	1,420 mm	26	1
2008	35.1 °C11 August 2008	0.2 °C18 February 2008	17.2 °C	1,512 mm	42	0
2007	34.1 °C11 August 2007	1.3 °C3 February 2007	17.9 °C	1,334 mm	47	0
2006	34.2 °C4 August 2006	0.4 °C5 February 2006	17.2 °C	1,853 mm	41	0
2005	34.4 °C4 August 2005	-1.0 °C18 December 2005	17.0 °C	1,076 mm	38	1
2004	34.5 °C20 June 2004	-1.7 °C22 January 2004	17.9 °C	1,785 mm	54	2
2003	34.7 °C6 August 2003	0.1 °C5 January 2003	17.3 °C	1,666 mm	28	0
2002	33.3 °C27 July 2002	2.0 °C2 January 2002	17.4 °C	1,244 mm	41	0
2001	34.6 °C3 August 2001	-0.9 °C15 January 2001	17.3 °C	1,785 mm	48	1
2000	34.5 °C29 July 2000	0.9 °C8 February 2000	17.1 °C	1,619 mm	48	0
1999	33.9 °C9 August 1999	-0.8 °C3 February 1999	17.2 °C	1,762 mm	30	1
1998	34.2 °C20 September 1998	-0.6 °C24 January 1998	18.1 °C	1,726 mm	54	1
1997	34.2 °C19 August 1997	0.0 °C22 January 1997	17.1 °C	1,993 mm	41	0
1996	35.7 °C12 August 1996	-1.7 °C2 February 1996	16.6 °C	1,347 mm	36	1
1995	35.3 °C23 August 1995	0.0 °C31 January 1995	16.4 °C	1,459 mm	44	0
1994	35.0 °C17 July 1994	-0.6 °C24 January 1994	17.5 °C	1,091 mm	63	1
1993	31.6 °C25 August 1993	1.3 °C28 January 1993	16.3 °C	2,472 mm	7	0
1992	33.3 °C28 August 1992	1.4 °C17 February 1992	16.8 °C	1,511 mm	31	0
1991	33.4 °C28 July 1991	-1.5 °C23 February 1991	16.7 °C	2,117 mm	22	3
1990	35.9 °C31 August 1990	-0.9 °C26 January 1990	17.7 °C	1,627 mm	61	4
1989	32.7 °C19 July 1989	0.9 °C3 February 1989	17.0 °C	1,695 mm	33	0
1988	33.6 °C9 August 1988	0.2 °C3 February 1988	16.3 °C	1,553 mm	17	0
1987	33.0 °C29 July 1987	0.1 °C3 February 1987	16.7 °C	1,916 mm	20	0
1986	33.2 °C1 August 1986	-0.6 °C3 January 1986	16.1 °C	1,463 mm	30	3
1985	33.6 °C19 August 1985	-1.2 °C30 January 1985	16.6 °C	1,950 mm	47	3
1984	33.4 °C31 July 1984	-1.4 °C7 February 1984	16.1 °C	1,397 mm	40	7
1983	33.8 °C5 August 1983	-1.7 °C14 February 1983	16.7 °C	1,679 mm	26	1
1982	32.1 °C8 August 1982	-0.8 °C29 January 1982	16.5 °C	1,992 mm	18	2
1981	33.1 °C29 July 1981	-3.6 °C26 February 1981	16.0 °C	1,600 mm	38	3
1980	31.4 °C20 July 1980	0.0 °C18 January 1980	15.7 °C	2,543 mm	3	0
1979	34.6 °C16 August 1979	-0.1 °C2 February 1979	16.6 °C	1,842 mm	31	1
1978	33.6 °C26 July 1978	0.0 °C16 February 1978	16.8 °C	1,235 mm	47	0
1977	32.8 °C27 July 1977	-4.3 °C16 February 1977	16.3 °C	1,805 mm	25	13
1976	33.2 °C22 August 1976	-1.2 °C24 January 1976	15.7 °C	2,084 mm	27	4
1975	33.8 °C29 July 1975	0.0 °C29 January 1975	16.5 °C	1,852 mm	38	0
1974	32.4 °C19 August 1974	-1.3 °C26 February 1974	15.9 °C	1,658 mm	23	4
1973	33.6 °C17 July 1973	-1.3 °C24 December 1973	16.4 °C	1,299 mm	44	1
1972	34.1 °C17 August 1972	1.1 °C3 January 1972	16.2 °C	2,425 mm	27	0
1971	34.9 °C1 August 1971	-0.8 °C4 January 1971	16.1 °C	1,713 mm	29	2
1970	33.9 °C5 August 1970	-2.8 °C5 January 1970	15.9 °C	1,549 mm	41	5
1969	33.7 °C21 August 1969	-0.1 °C16 January 1969	16.1 °C	1,472 mm	44	1
1968	32.8 °C13 August 1968	-6.2 °C18 February 1968	15.7 °C	1,612 mm	27	9
1967	34.6 °C28 July 1967	-3.0 °C16 January 1967	16.3 °C	1,349 mm	56	4
1966	32.1 °C9 August 1966	-1.4 °C20 January 1966	15.7 °C	1,722 mm	27	3
1965	33.3 °C5 August 1965	-1.4 °C3 February 1965	15.1 °C	1,924 mm	20	4
1964	34.7 °C17 August 1964	-0.2 °C14 February 1964	16.8 °C	1,509 mm	53	1
1963	33.1 °C30 July 1963	-2.1 °C16 January 1963	15.6 °C	1,961 mm	31	11
1962	33.1 °C30 July 1962	0.1 °C31 January 1962	15.9 °C	1,784 mm	28	0
1961	33.1 °C24 July 1961	-0.6 °C1 February 1961	16.9 °C	1,445 mm	54	1
1960	33.7 °C4 August 1960	-0.6 °C27 January 1960	16.5 °C	1,411 mm	41	4
1959	34.1 °C30 August 1959	-2.3 °C18 January 1959	16.7 °C	1,495 mm	31	4
1958	32.3 °C27 July 1958	-0.5 °C3 March 1958	16.4 °C	1,396 mm	34	1
1957	32.9 °C17 August 1957	-1.0 °C11 February 1957	15.6 °C	2,016 mm	16	4
1956	33.9 °C30 July 1956	-0.8 °C19 February 1956	15.5 °C	1,775 mm	32	6
1955	32.6 °C11 July 1955	-1.0 °C21 February 1955	16.3 °C	1,414 mm	32	4
1954	34.3 °C14 August 1954	0.6 °C5 February 1954	16.5 °C	1,921 mm	28	0
1953	34.3 °C16 August 1953	-0.5 °C10 February 1953	16.3 °C	1,896 mm	33	1
1952	32.3 °C17 August 1952	-0.3 °C6 February 1952	15.7 °C	1,683 mm	19	1
1951	33.8 °C17 August 1951	-0.2 °C21 January 1951	15.7 °C	1,647 mm	21	2
1950	31.3 °C17 July 1950	-0.7 °C12 March 1950	15.6 °C	1,385 mm	15	2
1949	31.2 °C24 July 1949	0.4 °C15 February 1949	15.3 °C	1,779 mm	8	0
1948	30.6 °C10 August 1948	0.9 °C30 January 1948	15.8 °C	1,605 mm	6	0
1947	31.4 °C14 August 1947	-2.3 °C16 February 1947	14.3 °C	1,193 mm	11	8
1946	32.6 °C24 July 1946	-1.3 °C10 January 1946	15.7 °C	1,079 mm	18	1
1945	31.3 °C1 August 1945	-0.6 °C18 January 1945	14.9 °C	2,009 mm	8	4
1944	30.9 °C30 July 1944	0.4 °C16 February 1944	15.3 °C	1,090 mm	8	0
1943	30.2 °C10 August 1943	-2.3 °C12 January 1943	15.0 °C	1,231 mm	3	6
1942	32.0 °C15 August 1942	-2.3 °C13 February 1942	15.3 °C	702 mm	25	9
1941	31.4 °C8 August 1941	-2.6 °C31 January 1941	15.1 °C	1,065 mm	5	7
1940	31.0 °C31 July 1940	-4.0 °C5 February 1940	14.8 °C	1,176 mm	8	15

Normals computed over complete calendar years 1940–2025.

A specific year

Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?

Year

Across the whole year

Average daily high

20.6 °C

+1.3 °C

Hot days (≥ 30 °C)

73 d/yr

+39

Frost days (< 0 °C)

3 d/yr

Annual rainfall

1549 mm

-87 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	9.2 °C	+0.4 °C	30 mm	-34 mm
Feb	7.8 °C	-1.6 °C	46 mm	-29 mm
Mar	13.7 °C	+1.0 °C	118 mm	+19 mm
Apr	18.2 °C	+0.7 °C	57 mm	-72 mm
May	21.8 °C	-0.1 °C	237 mm	+88 mm
Jun	26.5 °C	+1.5 °C	358 mm	+90 mm
Jul	32.1 °C	+3.2 °C	107 mm	-151 mm
Aug	31.5 °C	+1.3 °C	275 mm	+105 mm
Sep	29.8 °C	+2.9 °C	185 mm	+5 mm
Oct	24.7 °C	+2.8 °C	55 mm	-41 mm
Nov	17.7 °C	+0.9 °C	27 mm	-54 mm
Dec	13.1 °C	+1.6 °C	53 mm	-12 mm

The year's extremes

Hottest day

34.6 °C

24 Jul 2025

Coldest day

-1.0 °C

10 Jan 2025

Wettest day

112.7 mm

10 Jun 2025

Windiest day

34.2 km/h

7 Feb 2025

Strongest gust

83.9 km/h

9 May 2025

Hottest feels-like

41.1 °C

30 Aug 2025

Coldest feels-like

-7.4 °C

7 Feb 2025

Snowiest day

0.8 cm

9 Jan 2025

Sunniest day

13.6 h

5 Jun 2025

What was the weather like that day?

Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.

Date

Frequently asked questions

What is the climate of Itoshima?

Itoshima has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.5 °C and it receives 1,636 mm of precipitation per year.

What is the hottest day ever recorded in Itoshima?

The hottest day measured in Itoshima between 1940 and 2025 was 19 September 2024, reaching 36.4 °C.

What is the coldest day in Itoshima?

The coldest day measured in Itoshima between 1940 and 2025 was 18 February 1968, at -6.2 °C.

Does it snow in Itoshima?

Yes. Itoshima gets on average 8.4 cm of snow per year and has around 2 frost days.

Has the climate of Itoshima warmed?

Yes: Itoshima warmed by +2.6 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Itoshima?

The wettest day measured in Itoshima between 1940 and 2025 was 24 June 2012, with 179 mm of rain in 24 hours.

What was the windiest day in Itoshima?

The windiest day measured in Itoshima between 1940 and 2025 was 10 September 1956, with winds reaching 60.2 km/h.

What is the warmest month in Itoshima?

The warmest month in Itoshima is August (27.5 °C on average); the coldest is January (6.3 °C).

How much does it rain in Itoshima?

Itoshima receives on average 1,636 mm of precipitation per year, spread over about 146 rainy days.

Is it sunny in Itoshima?

Itoshima gets on average 8.1 hours of sunshine per day, roughly 2,957 hours per year over 1940-2025.

What is the biggest single-day snowfall in Itoshima?

The heaviest 24-hour snowfall measured in Itoshima between 1940 and 2025 was 15 February 1968, with 26.3 cm.

Are there tropical nights in Itoshima?

Yes: Itoshima has on average 102 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Itoshima?

In Itoshima, between 1940 and 2025, the highest apparent temperature reached 43.9 °C on 5 August 2024, and the lowest was -11.7 °C on 16 February 1977.

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