Saikū climate — normals and trends

Q: What is the climate of Saikū?

Saikū has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.5 °C and it receives 1,807 mm of precipitation per year.

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

The hottest day measured in Saikū between 1940 and 2025 was 17 August 2020, reaching 37.7 °C.

Q: What is the coldest day in Saikū?

The coldest day measured in Saikū between 1940 and 2025 was 27 February 1981, at -2.9 °C.

Q: Does it snow in Saikū?

Yes. Saikū gets on average 2.3 cm of snow per year and has around 1 frost days.

Q: Has the climate of Saikū warmed?

Yes: Saikū warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Saikū?

The wettest day measured in Saikū between 1940 and 2025 was 12 October 2019, with 257 mm of rain in 24 hours.

Q: What was the windiest day in Saikū?

The windiest day measured in Saikū between 1940 and 2025 was 26 September 1959, with winds reaching 101.8 km/h.

Q: What is the warmest month in Saikū?

The warmest month in Saikū is August (27.2 °C on average); the coldest is January (6.5 °C).

Q: How much does it rain in Saikū?

Saikū receives on average 1,807 mm of precipitation per year, spread over about 139 rainy days.

Q: Is it sunny in Saikū?

Saikū gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

Saikū (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 16.5 °C and it receives 1,807 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 (27.2 °C on average) and the coldest is January (6.5 °C). Rainfall peaks in September.

Saikū averages 1 frost days, 29 hot days (≥ 30 °C) and 139 rainy days per year.

Saikū has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.

The number of frost days there went from about 3 to 0 per year over the period.

The hottest day of the period reached 37.7 °C (on 17 August 2020) and the coldest -2.9 °C (on 27 February 1981).

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

SaikūMie

coords: 34.53°, 136.63°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthSeptemberDriest monthJanuary

Mean daily temperature

16.5°C

Average daily high

19.4°C

Average daily low

13.9°C

Annual rainfall

1,807mm

Sunshine / day

8.9h

Mean relative humidity

72%

Average peak wind

21.7km/h

Seasonal range

20.7°C

Frost days (< 0 °C)

1 d/yr

Hot days (≥ 30 °C)

29 d/yr

Rainy days (≥ 1 mm)

139 d/yr

Annual snowfall

2.3 cm

Average feels-like high

19.1 °C

Average feels-like low

12.4 °C

Average peak gust

43.1 km/h

Tropical nights (≥ 20 °C)

102 d/yr

Solar radiation

15.4 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.3 °C

since 1940

+0.3 °C per decade · r² = 0.66 · 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

37.7 °C

17 August 2020

Coldest day

-2.9 °C

27 February 1981

Wettest day

257 mm

12 October 2019

Windiest day

101.8 km/h

26 September 1959

Strongest gust

229.7 km/h

26 September 1959

Hottest feels-like

43.3 °C

27 July 2024

Coldest feels-like

-10.7 °C

26 February 1981

Snowiest day

17.0 cm

15 February 1968

Sunniest day

14.0 h

3 June 1940

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days	Frost days
2025	36.0 °C6 August 2025	0.0 °C8 February 2025	17.7 °C	1,547 mm	74	0
2024	36.9 °C9 August 2024	1.3 °C24 January 2024	18.5 °C	1,939 mm	71	0
2023	35.2 °C18 July 2023	-0.9 °C25 January 2023	18.2 °C	1,730 mm	69	2
2022	36.2 °C3 August 2022	1.6 °C17 February 2022	17.7 °C	1,722 mm	58	0
2021	35.5 °C8 August 2021	0.1 °C9 January 2021	17.9 °C	2,204 mm	39	0
2020	37.7 °C17 August 2020	1.5 °C10 February 2020	18.0 °C	1,923 mm	42	0
2019	34.8 °C1 August 2019	1.8 °C10 January 2019	17.9 °C	1,990 mm	44	0
2018	37.0 °C23 July 2018	-0.4 °C25 January 2018	17.8 °C	2,139 mm	44	2
2017	35.0 °C24 August 2017	0.3 °C15 January 2017	17.2 °C	1,719 mm	49	0
2016	35.9 °C8 August 2016	-0.6 °C25 January 2016	18.0 °C	1,979 mm	41	2
2015	35.1 °C11 August 2015	1.5 °C9 February 2015	17.6 °C	2,245 mm	33	0
2014	33.7 °C25 July 2014	1.2 °C6 February 2014	16.8 °C	1,654 mm	23	0
2013	37.4 °C11 August 2013	1.4 °C27 January 2013	17.3 °C	1,624 mm	50	0
2012	33.5 °C26 July 2012	-0.3 °C3 February 2012	16.7 °C	1,632 mm	29	1
2011	33.9 °C18 August 2011	-0.3 °C16 January 2011	17.0 °C	2,146 mm	31	1
2010	34.8 °C23 July 2010	1.2 °C14 January 2010	17.5 °C	1,898 mm	59	0
2009	32.9 °C19 July 2009	2.0 °C25 January 2009	17.2 °C	2,029 mm	24	0
2008	35.5 °C19 August 2008	1.2 °C24 February 2008	17.2 °C	1,949 mm	43	0
2007	34.9 °C17 August 2007	2.6 °C5 February 2007	17.5 °C	1,392 mm	27	0
2006	33.3 °C27 July 2006	-0.3 °C4 February 2006	16.8 °C	1,970 mm	26	1
2005	34.3 °C10 August 2005	0.4 °C2 February 2005	16.9 °C	1,240 mm	43	0
2004	35.7 °C20 July 2004	0.1 °C22 January 2004	17.8 °C	2,067 mm	39	0
2003	33.8 °C3 September 2003	-1.0 °C29 January 2003	16.7 °C	2,057 mm	27	2
2002	34.3 °C1 August 2002	0.8 °C3 January 2002	16.9 °C	1,561 mm	33	0
2001	37.2 °C4 August 2001	0.2 °C15 January 2001	17.0 °C	1,624 mm	43	0
2000	34.9 °C22 July 2000	0.8 °C16 February 2000	17.0 °C	1,752 mm	34	0
1999	32.4 °C28 August 1999	-1.0 °C4 February 1999	17.1 °C	1,547 mm	29	2
1998	34.8 °C16 August 1998	0.2 °C25 January 1998	17.9 °C	2,245 mm	41	0
1997	33.3 °C30 August 1997	-1.9 °C22 January 1997	16.6 °C	1,507 mm	33	1
1996	33.8 °C15 August 1996	-0.3 °C20 February 1996	16.0 °C	1,502 mm	23	1
1995	36.1 °C19 August 1995	0.5 °C31 January 1995	16.5 °C	1,356 mm	47	0
1994	36.5 °C5 August 1994	1.1 °C30 January 1994	17.5 °C	1,635 mm	47	0
1993	32.0 °C27 August 1993	1.7 °C15 February 1993	16.3 °C	1,997 mm	8	0
1992	33.8 °C27 July 1992	2.6 °C8 March 1992	16.6 °C	1,986 mm	20	0
1991	35.5 °C24 July 1991	-0.1 °C25 February 1991	17.0 °C	2,238 mm	34	1
1990	35.6 °C4 August 1990	-0.2 °C25 January 1990	17.4 °C	1,642 mm	40	1
1989	31.8 °C9 August 1989	1.7 °C29 January 1989	16.9 °C	1,862 mm	16	0
1988	32.2 °C29 August 1988	0.5 °C3 February 1988	16.2 °C	1,873 mm	17	0
1987	33.3 °C26 July 1987	0.5 °C26 January 1987	16.9 °C	1,281 mm	33	0
1986	32.6 °C3 September 1986	0.1 °C16 February 1986	16.0 °C	1,349 mm	17	0
1985	33.0 °C30 July 1985	-0.3 °C31 January 1985	16.5 °C	1,877 mm	35	1
1984	32.8 °C5 July 1984	-1.5 °C7 February 1984	15.8 °C	1,292 mm	29	4
1983	34.5 °C4 August 1983	0.6 °C23 January 1983	16.5 °C	1,906 mm	36	0
1982	30.8 °C4 August 1982	-0.3 °C29 January 1982	16.2 °C	2,162 mm	3	2
1981	33.5 °C18 July 1981	-2.9 °C27 February 1981	15.8 °C	1,443 mm	18	3
1980	31.4 °C23 July 1980	0.2 °C18 January 1980	16.0 °C	2,256 mm	7	0
1979	32.9 °C31 July 1979	1.2 °C3 February 1979	16.9 °C	2,080 mm	26	0
1978	34.1 °C23 August 1978	0.3 °C1 February 1978	16.7 °C	1,580 mm	46	0
1977	34.2 °C14 July 1977	-1.7 °C16 February 1977	16.9 °C	1,917 mm	25	3
1976	33.7 °C14 August 1976	0.5 °C21 January 1976	15.9 °C	1,839 mm	13	0
1975	32.3 °C18 July 1975	0.5 °C18 February 1975	16.5 °C	2,234 mm	22	0
1974	32.1 °C6 August 1974	-0.2 °C12 February 1974	16.1 °C	2,270 mm	19	2
1973	33.6 °C10 August 1973	0.2 °C25 February 1973	16.4 °C	1,888 mm	35	0
1972	33.6 °C8 August 1972	1.5 °C25 February 1972	16.5 °C	2,447 mm	24	0
1971	32.4 °C8 August 1971	0.2 °C2 February 1971	16.0 °C	2,024 mm	24	0
1970	33.0 °C5 August 1970	0.1 °C5 February 1970	15.7 °C	2,049 mm	23	0
1969	35.2 °C13 August 1969	-0.5 °C6 February 1969	16.0 °C	1,767 mm	27	1
1968	33.4 °C22 July 1968	-0.1 °C21 February 1968	15.9 °C	2,026 mm	12	1
1967	34.6 °C25 August 1967	-1.4 °C16 January 1967	16.3 °C	1,947 mm	34	3
1966	32.3 °C30 July 1966	-0.8 °C20 January 1966	15.6 °C	1,979 mm	14	2
1965	33.1 °C12 August 1965	-0.4 °C3 February 1965	15.1 °C	1,762 mm	15	2
1964	32.9 °C26 August 1964	0.4 °C27 February 1964	16.8 °C	1,619 mm	48	0
1963	34.3 °C18 July 1963	-1.1 °C24 January 1963	16.1 °C	1,643 mm	26	5
1962	34.3 °C9 August 1962	0.9 °C14 February 1962	16.5 °C	1,872 mm	34	0
1961	34.2 °C17 July 1961	0.2 °C2 February 1961	17.0 °C	1,815 mm	37	0
1960	34.2 °C1 August 1960	-0.3 °C25 January 1960	16.8 °C	1,846 mm	30	1
1959	33.5 °C2 September 1959	-1.0 °C18 January 1959	17.3 °C	2,388 mm	43	2
1958	32.9 °C1 August 1958	0.0 °C4 January 1958	16.6 °C	2,106 mm	21	0
1957	32.5 °C1 August 1957	0.5 °C12 February 1957	16.0 °C	1,965 mm	11	0
1956	35.2 °C2 August 1956	-0.1 °C9 January 1956	16.2 °C	2,006 mm	32	1
1955	33.7 °C9 August 1955	-0.1 °C28 January 1955	16.8 °C	1,844 mm	28	1
1954	34.5 °C9 August 1954	0.5 °C22 February 1954	16.5 °C	2,110 mm	20	0
1953	34.4 °C21 August 1953	0.3 °C23 February 1953	16.1 °C	1,894 mm	23	0
1952	33.0 °C25 August 1952	-0.8 °C5 February 1952	15.5 °C	1,933 mm	25	2
1951	33.1 °C30 July 1951	-1.0 °C22 January 1951	15.5 °C	1,504 mm	22	1
1950	31.5 °C22 August 1950	-0.3 °C7 January 1950	15.7 °C	2,037 mm	3	1
1949	32.6 °C6 August 1949	0.3 °C17 January 1949	15.3 °C	1,593 mm	10	0
1948	30.4 °C26 July 1948	0.7 °C24 February 1948	16.0 °C	1,495 mm	4	0
1947	33.2 °C12 August 1947	-2.5 °C16 February 1947	14.7 °C	1,178 mm	28	14
1946	33.1 °C14 July 1946	0.4 °C12 March 1946	15.6 °C	1,369 mm	16	0
1945	30.9 °C10 August 1945	-1.0 °C4 February 1945	15.2 °C	2,154 mm	3	4
1944	31.5 °C30 August 1944	0.0 °C1 February 1944	15.4 °C	1,204 mm	7	0
1943	31.9 °C15 August 1943	-1.5 °C13 January 1943	15.1 °C	1,046 mm	6	5
1942	33.2 °C4 August 1942	-1.7 °C14 February 1942	15.5 °C	1,101 mm	26	10
1941	30.7 °C18 August 1941	-1.7 °C1 February 1941	15.4 °C	2,021 mm	3	10
1940	30.7 °C24 July 1940	-1.5 °C28 January 1940	15.0 °C	1,146 mm	4	19

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

20.8 °C

+1.4 °C

Hot days (≥ 30 °C)

74 d/yr

+45

Frost days (< 0 °C)

0 d/yr

-1

Annual rainfall

1547 mm

-260 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	10.1 °C	+0.7 °C	36 mm	-24 mm
Feb	9.2 °C	-0.8 °C	25 mm	-48 mm
Mar	14.3 °C	+1.1 °C	83 mm	-31 mm
Apr	19.5 °C	+1.6 °C	120 mm	-20 mm
May	22.1 °C	+0.3 °C	283 mm	+115 mm
Jun	27.0 °C	+2.2 °C	170 mm	-72 mm
Jul	30.7 °C	+2.1 °C	98 mm	-106 mm
Aug	32.8 °C	+2.9 °C	67 mm	-107 mm
Sep	29.6 °C	+2.8 °C	219 mm	-25 mm
Oct	22.8 °C	+1.1 °C	298 mm	+81 mm
Nov	17.2 °C	+0.3 °C	30 mm	-80 mm
Dec	13.0 °C	+1.1 °C	119 mm	+57 mm

The year's extremes

Hottest day

36.0 °C

6 Aug 2025

Coldest day

0.0 °C

8 Feb 2025

Wettest day

59.1 mm

11 Oct 2025

Windiest day

45.6 km/h

19 Mar 2025

Strongest gust

88.2 km/h

19 Mar 2025

Hottest feels-like

42.3 °C

6 Aug 2025

Coldest feels-like

-8.5 °C

8 Feb 2025

Sunniest day

14.0 h

4 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 Saikū?

Saikū has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 16.5 °C and it receives 1,807 mm of precipitation per year.

What is the hottest day ever recorded in Saikū?

The hottest day measured in Saikū between 1940 and 2025 was 17 August 2020, reaching 37.7 °C.

What is the coldest day in Saikū?

The coldest day measured in Saikū between 1940 and 2025 was 27 February 1981, at -2.9 °C.

Does it snow in Saikū?

Yes. Saikū gets on average 2.3 cm of snow per year and has around 1 frost days.

Has the climate of Saikū warmed?

Yes: Saikū warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Saikū?

The wettest day measured in Saikū between 1940 and 2025 was 12 October 2019, with 257 mm of rain in 24 hours.

What was the windiest day in Saikū?

The windiest day measured in Saikū between 1940 and 2025 was 26 September 1959, with winds reaching 101.8 km/h.

What is the warmest month in Saikū?

The warmest month in Saikū is August (27.2 °C on average); the coldest is January (6.5 °C).

How much does it rain in Saikū?

Saikū receives on average 1,807 mm of precipitation per year, spread over about 139 rainy days.

Is it sunny in Saikū?

Saikū gets on average 8.9 hours of sunshine per day, roughly 3,249 hours per year over 1940-2025.

What is the biggest single-day snowfall in Saikū?

The heaviest 24-hour snowfall measured in Saikū between 1940 and 2025 was 15 February 1968, with 17.0 cm.

Are there tropical nights in Saikū?

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

What was the most extreme apparent temperature in Saikū?

In Saikū, between 1940 and 2025, the highest apparent temperature reached 43.3 °C on 27 July 2024, and the lowest was -10.7 °C on 26 February 1981.

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