Tosu climate — normals and trends

Q: What is the climate of Tosu?

Tosu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.6 °C and it receives 1,865 mm of precipitation per year.

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

The hottest day measured in Tosu between 1940 and 2025 was 27 August 2024, reaching 37.4 °C.

Q: What is the coldest day in Tosu?

The coldest day measured in Tosu between 1940 and 2025 was 1 February 1940, at -9.0 °C.

Q: Does it snow in Tosu?

Yes. Tosu gets on average 6.0 cm of snow per year and has around 34 frost days.

Q: Has the climate of Tosu warmed?

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

Q: What is the wettest day in Tosu?

The wettest day measured in Tosu between 1940 and 2025 was 6 July 2018, with 223 mm of rain in 24 hours.

Q: What was the windiest day in Tosu?

The windiest day measured in Tosu between 1940 and 2025 was 27 September 1991, with winds reaching 60.6 km/h.

Q: What is the warmest month in Tosu?

The warmest month in Tosu is August (26.8 °C on average); the coldest is January (4.8 °C).

Q: How much does it rain in Tosu?

Tosu receives on average 1,865 mm of precipitation per year, spread over about 140 rainy days.

Q: Is it sunny in Tosu?

Tosu gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.

Tosu (Japan) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 15.6 °C and it receives 1,865 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 (26.8 °C on average) and the coldest is January (4.8 °C). Rainfall peaks in June.

Tosu averages 34 frost days, 42 hot days (≥ 30 °C) and 140 rainy days per year.

Tosu has warmed by +2.6 °C between 1940 and 2025, or +0.30 °C per decade. This trend is statistically significant.

The number of frost days there went from about 51 to 17 per year over the period.

The hottest day of the period reached 37.4 °C (on 27 August 2024) and the coldest -9.0 °C (on 1 February 1940).

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

TosuSaga

coords: 33.37°, 130.52°
period: 1940–2025 · 86 yrs

CfaHumid subtropicalWarmest monthAugustColdest monthJanuaryWettest monthJuneDriest monthJanuary

Mean daily temperature

15.6°C

Average daily high

19.9°C

Average daily low

11.6°C

Annual rainfall

1,865mm

Sunshine / day

8.0h

Mean relative humidity

76%

Average peak wind

13.0km/h

Seasonal range

22.0°C

Frost days (< 0 °C)

34 d/yr

Hot days (≥ 30 °C)

42 d/yr

Rainy days (≥ 1 mm)

140 d/yr

Annual snowfall

6.0 cm

Average feels-like high

20.2 °C

Average feels-like low

11.1 °C

Average peak gust

31.4 km/h

Tropical nights (≥ 20 °C)

86 d/yr

Solar radiation

13.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+2.6 °C

since 1940

+0.3 °C per decade · r² = 0.73 · 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

37.4 °C

27 August 2024

Coldest day

-9.0 °C

1 February 1940

Wettest day

223 mm

6 July 2018

Windiest day

60.6 km/h

27 September 1991

Strongest gust

163.4 km/h

31 August 1987

Hottest feels-like

43.4 °C

3 August 2024

Coldest feels-like

-13.9 °C

16 January 1963

Snowiest day

22.1 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	35.4 °C31 July 2025	-4.1 °C11 February 2025	16.7 °C	1,837 mm	77	42
2024	37.4 °C27 August 2024	-2.9 °C25 December 2024	17.7 °C	2,205 mm	79	18
2023	35.2 °C5 August 2023	-3.8 °C25 January 2023	17.1 °C	1,920 mm	59	22
2022	34.6 °C1 July 2022	-4.1 °C19 January 2022	16.8 °C	1,426 mm	64	25
2021	35.6 °C5 August 2021	-4.1 °C8 January 2021	17.0 °C	2,329 mm	52	17
2020	35.3 °C25 August 2020	-1.9 °C19 February 2020	16.6 °C	2,396 mm	39	9
2019	35.5 °C2 August 2019	-2.1 °C4 January 2019	16.8 °C	1,780 mm	46	10
2018	35.8 °C14 August 2018	-4.2 °C8 February 2018	16.6 °C	1,879 mm	64	33
2017	34.7 °C30 July 2017	-3.9 °C25 January 2017	16.2 °C	1,755 mm	50	28
2016	35.6 °C11 August 2016	-5.0 °C25 January 2016	17.1 °C	2,386 mm	58	20
2015	35.0 °C8 August 2015	-2.9 °C3 January 2015	16.3 °C	2,290 mm	30	17
2014	35.0 °C30 July 2014	-3.0 °C19 December 2014	16.1 °C	1,807 mm	25	19
2013	36.2 °C20 August 2013	-2.6 °C11 January 2013	16.6 °C	1,798 mm	62	21
2012	35.2 °C31 July 2012	-3.3 °C2 February 2012	16.0 °C	2,031 mm	43	32
2011	34.8 °C4 August 2011	-3.5 °C16 January 2011	16.4 °C	1,960 mm	60	30
2010	35.6 °C4 September 2010	-3.0 °C27 January 2010	16.6 °C	1,928 mm	59	17
2009	34.3 °C7 August 2009	-3.0 °C24 January 2009	16.8 °C	1,587 mm	55	16
2008	36.6 °C11 August 2008	-3.7 °C18 February 2008	16.4 °C	1,797 mm	56	17
2007	34.7 °C19 September 2007	-3.0 °C3 February 2007	17.2 °C	1,543 mm	69	8
2006	35.3 °C8 August 2006	-3.8 °C13 February 2006	16.5 °C	2,231 mm	45	24
2005	34.5 °C24 June 2005	-3.4 °C27 February 2005	16.2 °C	1,352 mm	55	37
2004	35.2 °C12 August 2004	-3.0 °C22 January 2004	16.9 °C	1,992 mm	62	20
2003	34.1 °C6 August 2003	-2.1 °C8 January 2003	16.5 °C	1,894 mm	33	20
2002	33.8 °C27 July 2002	-2.4 °C14 December 2002	16.7 °C	1,496 mm	62	11
2001	35.1 °C3 August 2001	-3.1 °C18 January 2001	16.4 °C	1,826 mm	59	23
2000	34.2 °C29 July 2000	-2.7 °C29 January 2000	16.2 °C	1,833 mm	50	20
1999	33.6 °C25 July 1999	-2.5 °C14 February 1999	16.3 °C	1,890 mm	35	22
1998	34.9 °C20 September 1998	-4.9 °C25 January 1998	17.2 °C	2,018 mm	68	13
1997	33.8 °C19 August 1997	-2.6 °C4 December 1997	16.1 °C	2,252 mm	50	21
1996	35.5 °C12 August 1996	-3.7 °C11 February 1996	15.7 °C	1,641 mm	46	31
1995	34.8 °C23 August 1995	-3.9 °C31 December 1995	15.4 °C	1,747 mm	43	32
1994	36.8 °C17 July 1994	-2.9 °C24 January 1994	16.7 °C	1,233 mm	70	30
1993	32.2 °C8 August 1993	-2.7 °C22 January 1993	15.3 °C	2,835 mm	9	24
1992	33.4 °C28 August 1992	-2.8 °C20 January 1992	15.9 °C	1,684 mm	37	17
1991	33.8 °C28 July 1991	-4.0 °C22 February 1991	15.9 °C	2,509 mm	35	25
1990	35.5 °C29 July 1990	-5.6 °C17 January 1990	16.7 °C	1,916 mm	64	19
1989	33.0 °C22 August 1989	-2.2 °C30 January 1989	16.1 °C	1,884 mm	42	14
1988	33.9 °C9 August 1988	-2.5 °C11 February 1988	15.3 °C	1,866 mm	26	29
1987	33.2 °C30 August 1987	-2.9 °C11 January 1987	15.8 °C	2,377 mm	22	26
1986	33.4 °C2 August 1986	-4.0 °C3 January 1986	15.2 °C	1,741 mm	40	46
1985	35.1 °C29 August 1985	-4.3 °C18 December 1985	15.8 °C	2,095 mm	48	35
1984	35.7 °C10 August 1984	-7.6 °C20 January 1984	15.2 °C	1,593 mm	48	54
1983	34.8 °C5 August 1983	-4.8 °C14 February 1983	15.8 °C	1,911 mm	35	42
1982	32.3 °C31 July 1982	-2.9 °C3 February 1982	15.5 °C	2,122 mm	23	36
1981	33.9 °C19 July 1981	-8.7 °C23 January 1981	14.7 °C	1,726 mm	38	53
1980	31.5 °C20 July 1980	-6.5 °C10 February 1980	14.6 °C	2,915 mm	5	48
1979	34.9 °C16 August 1979	-1.9 °C23 January 1979	15.6 °C	2,137 mm	37	24
1978	34.3 °C26 July 1978	-3.5 °C2 March 1978	15.8 °C	1,282 mm	63	30
1977	33.4 °C29 July 1977	-7.7 °C6 February 1977	15.4 °C	2,077 mm	37	56
1976	32.4 °C20 August 1976	-5.7 °C24 January 1976	14.8 °C	2,451 mm	28	43
1975	33.8 °C2 August 1975	-5.3 °C24 February 1975	15.7 °C	2,118 mm	42	35
1974	33.7 °C19 August 1974	-4.5 °C27 February 1974	14.9 °C	1,784 mm	30	46
1973	34.3 °C22 July 1973	-3.8 °C27 December 1973	15.4 °C	1,535 mm	50	38
1972	34.2 °C17 August 1972	-3.1 °C29 January 1972	15.3 °C	2,641 mm	33	29
1971	35.1 °C1 August 1971	-4.7 °C11 February 1971	15.2 °C	2,010 mm	32	49
1970	34.1 °C5 August 1970	-4.3 °C18 January 1970	15.1 °C	1,704 mm	45	39
1969	34.0 °C23 August 1969	-4.1 °C20 December 1969	15.3 °C	1,697 mm	52	40
1968	34.5 °C25 July 1968	-8.9 °C18 February 1968	14.9 °C	1,833 mm	34	48
1967	34.5 °C12 August 1967	-4.3 °C16 January 1967	15.6 °C	1,481 mm	64	50
1966	34.4 °C9 August 1966	-3.9 °C20 January 1966	14.9 °C	2,003 mm	37	38
1965	33.0 °C5 August 1965	-4.4 °C17 January 1965	14.1 °C	2,097 mm	21	47
1964	34.9 °C17 August 1964	-4.4 °C13 December 1964	15.9 °C	1,609 mm	54	33
1963	32.7 °C19 July 1963	-8.5 °C16 January 1963	14.8 °C	2,168 mm	36	58
1962	33.2 °C26 July 1962	-3.8 °C1 February 1962	14.9 °C	1,959 mm	34	47
1961	34.4 °C18 July 1961	-5.0 °C20 January 1961	15.9 °C	1,586 mm	60	45
1960	34.8 °C21 August 1960	-5.6 °C13 February 1960	15.5 °C	1,571 mm	53	39
1959	34.2 °C3 August 1959	-4.0 °C12 February 1959	15.8 °C	1,844 mm	34	31
1958	33.8 °C6 August 1958	-3.4 °C17 February 1958	15.6 °C	1,579 mm	47	32
1957	32.9 °C17 August 1957	-4.3 °C28 February 1957	14.7 °C	2,378 mm	17	49
1956	34.0 °C30 July 1956	-5.2 °C15 January 1956	14.6 °C	1,955 mm	39	59
1955	32.5 °C21 July 1955	-3.7 °C4 January 1955	15.3 °C	1,664 mm	41	43
1954	34.5 °C24 August 1954	-4.0 °C23 February 1954	15.5 °C	2,063 mm	32	36
1953	34.7 °C16 August 1953	-3.9 °C17 January 1953	15.3 °C	2,094 mm	40	33
1952	33.2 °C17 July 1952	-4.0 °C27 January 1952	14.8 °C	1,886 mm	27	31
1951	33.6 °C17 August 1951	-3.4 °C8 February 1951	14.8 °C	1,865 mm	30	41
1950	32.4 °C17 July 1950	-2.9 °C29 December 1950	14.9 °C	1,485 mm	28	42
1949	31.6 °C14 August 1949	-3.4 °C17 January 1949	14.5 °C	2,063 mm	17	21
1948	31.9 °C19 August 1948	-2.7 °C24 February 1948	15.1 °C	1,719 mm	14	35
1947	32.6 °C14 August 1947	-4.0 °C5 February 1947	13.6 °C	1,405 mm	18	64
1946	35.0 °C25 July 1946	-3.5 °C4 February 1946	15.0 °C	1,107 mm	36	40
1945	32.2 °C1 August 1945	-4.3 °C19 January 1945	14.1 °C	2,324 mm	23	65
1944	31.8 °C14 August 1944	-3.6 °C17 February 1944	14.6 °C	1,307 mm	24	52
1943	31.5 °C15 August 1943	-3.5 °C14 February 1943	14.3 °C	1,288 mm	12	67
1942	34.4 °C4 August 1942	-4.9 °C12 February 1942	14.7 °C	822 mm	57	53
1941	32.4 °C8 August 1941	-5.4 °C1 February 1941	14.4 °C	1,311 mm	12	50
1940	31.6 °C30 July 1940	-9.0 °C1 February 1940	14.0 °C	1,214 mm	21	56

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

21.3 °C

+1.4 °C

Hot days (≥ 30 °C)

77 d/yr

+35

Frost days (< 0 °C)

42 d/yr

Annual rainfall

1837 mm

-28 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	9.5 °C	+0.6 °C	20 mm	-39 mm
Feb	8.2 °C	-1.8 °C	49 mm	-33 mm
Mar	15.1 °C	+1.3 °C	160 mm	+42 mm
Apr	20.1 °C	+1.0 °C	78 mm	-75 mm
May	23.2 °C	0.0 °C	341 mm	+158 mm
Jun	27.1 °C	+1.2 °C	481 mm	+135 mm
Jul	33.0 °C	+3.7 °C	86 mm	-238 mm
Aug	31.8 °C	+1.1 °C	289 mm	+110 mm
Sep	29.9 °C	+2.5 °C	187 mm	+4 mm
Oct	25.2 °C	+2.8 °C	68 mm	-32 mm
Nov	17.9 °C	+1.0 °C	26 mm	-53 mm
Dec	13.2 °C	+1.9 °C	54 mm	-6 mm

The year's extremes

Hottest day

35.4 °C

31 Jul 2025

Coldest day

-4.1 °C

11 Feb 2025

Wettest day

142.7 mm

10 Jun 2025

Windiest day

31.2 km/h

16 Jun 2025

Strongest gust

79.9 km/h

16 Jun 2025

Hottest feels-like

42.0 °C

8 Jul 2025

Coldest feels-like

-7.9 °C

10 Jan 2025

Snowiest day

0.7 cm

5 Feb 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 Tosu?

Tosu has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 15.6 °C and it receives 1,865 mm of precipitation per year.

What is the hottest day ever recorded in Tosu?

The hottest day measured in Tosu between 1940 and 2025 was 27 August 2024, reaching 37.4 °C.

What is the coldest day in Tosu?

The coldest day measured in Tosu between 1940 and 2025 was 1 February 1940, at -9.0 °C.

Does it snow in Tosu?

Yes. Tosu gets on average 6.0 cm of snow per year and has around 34 frost days.

Has the climate of Tosu warmed?

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

What is the wettest day in Tosu?

The wettest day measured in Tosu between 1940 and 2025 was 6 July 2018, with 223 mm of rain in 24 hours.

What was the windiest day in Tosu?

The windiest day measured in Tosu between 1940 and 2025 was 27 September 1991, with winds reaching 60.6 km/h.

What is the warmest month in Tosu?

The warmest month in Tosu is August (26.8 °C on average); the coldest is January (4.8 °C).

How much does it rain in Tosu?

Tosu receives on average 1,865 mm of precipitation per year, spread over about 140 rainy days.

Is it sunny in Tosu?

Tosu gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.

What is the biggest single-day snowfall in Tosu?

The heaviest 24-hour snowfall measured in Tosu between 1940 and 2025 was 15 February 1968, with 22.1 cm.

Are there tropical nights in Tosu?

Yes: Tosu has on average 86 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Tosu?

In Tosu, between 1940 and 2025, the highest apparent temperature reached 43.4 °C on 3 August 2024, and the lowest was -13.9 °C on 16 January 1963.

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