Tonga climate — normals and trends

Q: What is the climate of Tonga?

Tonga has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 22.6 °C and it receives 1,298 mm of precipitation per year.

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

The hottest day measured in Tonga between 1940 and 2025 was 22 February 2016, reaching 37.3 °C.

Q: What is the coldest day in Tonga?

The coldest day measured in Tonga between 1940 and 2025 was 10 December 1975, at 12.4 °C.

Q: Does it snow in Tonga?

Almost never: Tonga sees virtually no snow, with about 0 frost days per year.

Q: Has the climate of Tonga warmed?

Yes: Tonga warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Tonga?

The wettest day measured in Tonga between 1940 and 2025 was 8 July 2023, with 103 mm of rain in 24 hours.

Q: What was the windiest day in Tonga?

The windiest day measured in Tonga between 1940 and 2025 was 17 March 1959, with winds reaching 20.0 km/h.

Q: What is the warmest month in Tonga?

The warmest month in Tonga is February (24.5 °C on average); the coldest is August (21.0 °C).

Q: How much does it rain in Tonga?

Tonga receives on average 1,298 mm of precipitation per year, spread over about 225 rainy days.

Q: Is it sunny in Tonga?

Tonga gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.

Tonga (Cameroon) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 22.6 °C and it receives 1,298 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 February (24.5 °C on average) and the coldest is August (21.0 °C). Rainfall peaks in September.

Tonga averages 0 frost days, 86 hot days (≥ 30 °C) and 225 rainy days per year.

Tonga has warmed by +1.7 °C between 1940 and 2025, or +0.20 °C per decade. This trend is statistically significant.

The hottest day of the period reached 37.3 °C (on 22 February 2016) and the coldest 12.4 °C (on 10 December 1975).

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

TongaWest Region

coords: 4.97°, 10.70°
period: 1940–2025 · 86 yrs

AwTropical savannaWarmest monthFebruaryColdest monthAugustWettest monthSeptemberDriest monthJanuary

Mean daily temperature

22.6°C

Average daily high

27.9°C

Average daily low

19.1°C

Annual rainfall

1,298mm

Sunshine / day

9.8h

Mean relative humidity

82%

Average peak wind

10.4km/h

Seasonal range

3.5°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

86 d/yr

Rainy days (≥ 1 mm)

225 d/yr

Annual snowfall

0.0 cm

Average feels-like high

31.0 °C

Average feels-like low

21.5 °C

Average peak gust

30.1 km/h

Tropical nights (≥ 20 °C)

68 d/yr

Solar radiation

17.9 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.7 °C

since 1940

+0.2 °C per decade · r² = 0.72 · 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

37.3 °C

22 February 2016

Coldest day

12.4 °C

10 December 1975

Wettest day

103 mm

8 July 2023

Windiest day

20.0 km/h

17 March 1959

Strongest gust

53.6 km/h

6 May 2008

Hottest feels-like

39.7 °C

28 March 2024

Coldest feels-like

11.3 °C

10 December 1975

Sunniest day

11.9 h

23 July 1943

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	36.4 °C8 March 2025	16.9 °C11 January 2025	23.7 °C	1,345 mm	143
2024	36.7 °C27 February 2024	17.6 °C18 January 2024	24.2 °C	1,056 mm	177
2023	36.4 °C27 February 2023	17.6 °C17 January 2023	23.8 °C	1,423 mm	134
2022	35.6 °C1 March 2022	17.1 °C24 December 2022	23.4 °C	1,396 mm	141
2021	36.6 °C5 March 2021	18.1 °C17 December 2021	23.7 °C	1,191 mm	126
2020	37.0 °C18 March 2020	13.9 °C26 January 2020	23.8 °C	1,236 mm	154
2019	36.0 °C21 February 2019	18.1 °C24 December 2019	23.5 °C	1,487 mm	127
2018	37.2 °C6 February 2018	16.2 °C5 January 2018	23.3 °C	1,311 mm	125
2017	37.2 °C23 February 2017	17.0 °C27 December 2017	23.5 °C	1,291 mm	146
2016	37.3 °C22 February 2016	17.0 °C30 January 2016	23.6 °C	1,368 mm	141
2015	34.9 °C27 January 2015	13.9 °C11 January 2015	23.3 °C	1,293 mm	135
2014	35.5 °C24 February 2014	16.7 °C7 January 2014	23.1 °C	1,454 mm	112
2013	34.8 °C1 March 2013	13.4 °C17 December 2013	23.0 °C	1,346 mm	93
2012	35.7 °C27 March 2012	17.3 °C26 December 2012	23.1 °C	1,246 mm	119
2011	35.2 °C15 March 2011	15.8 °C1 January 2011	23.1 °C	1,243 mm	132
2010	36.5 °C31 January 2010	16.4 °C11 December 2010	23.6 °C	1,330 mm	134
2009	34.5 °C18 December 2009	17.4 °C5 June 2009	23.3 °C	1,205 mm	124
2008	34.8 °C3 March 2008	14.7 °C1 February 2008	23.0 °C	1,152 mm	100
2007	35.9 °C7 February 2007	14.3 °C3 January 2007	22.9 °C	1,538 mm	110
2006	34.6 °C8 February 2006	17.4 °C31 December 2006	23.0 °C	1,159 mm	119
2005	36.2 °C19 February 2005	14.7 °C8 January 2005	23.1 °C	1,111 mm	130
2004	35.8 °C26 March 2004	17.5 °C3 December 2004	23.1 °C	1,380 mm	114
2003	36.2 °C8 February 2003	17.2 °C4 July 2003	23.0 °C	1,327 mm	118
2002	34.9 °C19 February 2002	16.5 °C3 February 2002	22.8 °C	1,226 mm	81
2001	34.8 °C20 February 2001	16.8 °C4 January 2001	22.6 °C	1,198 mm	94
2000	36.1 °C26 February 2000	15.9 °C17 December 2000	22.6 °C	1,379 mm	90
1999	33.0 °C27 March 1999	17.2 °C17 December 1999	22.4 °C	1,419 mm	73
1998	36.0 °C13 March 1998	15.7 °C7 January 1998	23.5 °C	1,115 mm	118
1997	34.9 °C23 February 1997	16.1 °C14 February 1997	22.8 °C	1,279 mm	81
1996	34.5 °C26 February 1996	17.6 °C20 July 1996	22.7 °C	1,412 mm	98
1995	34.1 °C3 March 1995	16.9 °C23 January 1995	22.7 °C	1,429 mm	85
1994	33.7 °C21 February 1994	16.1 °C13 December 1994	22.7 °C	1,570 mm	77
1993	33.8 °C15 February 1993	14.9 °C8 February 1993	22.6 °C	1,516 mm	66
1992	35.2 °C22 February 1992	15.4 °C12 January 1992	22.5 °C	1,219 mm	72
1991	33.7 °C13 February 1991	17.5 °C18 October 1991	22.4 °C	1,221 mm	66
1990	35.0 °C25 March 1990	17.4 °C26 February 1990	22.6 °C	1,404 mm	78
1989	34.6 °C26 February 1989	15.4 °C12 January 1989	22.4 °C	1,274 mm	78
1988	35.2 °C26 February 1988	16.9 °C24 December 1988	22.7 °C	1,395 mm	84
1987	33.8 °C25 February 1987	16.6 °C21 December 1987	23.0 °C	1,308 mm	101
1986	33.2 °C2 February 1986	15.0 °C22 December 1986	22.3 °C	1,422 mm	50
1985	33.6 °C4 March 1985	15.6 °C6 December 1985	22.1 °C	1,557 mm	42
1984	34.0 °C15 February 1984	12.6 °C16 December 1984	22.4 °C	1,323 mm	63
1983	36.9 °C19 March 1983	14.1 °C9 January 1983	22.8 °C	1,175 mm	97
1982	32.9 °C8 March 1982	15.9 °C11 February 1982	22.1 °C	1,541 mm	41
1981	33.1 °C14 February 1981	16.6 °C1 December 1981	22.2 °C	1,355 mm	59
1980	34.0 °C19 February 1980	16.2 °C14 December 1980	22.3 °C	1,555 mm	75
1979	33.2 °C6 February 1979	16.7 °C9 December 1979	22.2 °C	1,410 mm	55
1978	33.5 °C21 February 1978	15.6 °C12 January 1978	22.2 °C	1,383 mm	61
1977	33.6 °C7 March 1977	16.7 °C29 December 1977	22.4 °C	1,028 mm	57
1976	31.1 °C16 February 1976	16.3 °C25 January 1976	21.8 °C	1,294 mm	15
1975	32.7 °C12 March 1975	12.4 °C10 December 1975	21.7 °C	1,381 mm	37
1974	32.9 °C11 February 1974	15.0 °C28 December 1974	21.8 °C	1,591 mm	40
1973	33.9 °C6 February 1973	16.9 °C10 September 1973	22.5 °C	1,496 mm	84
1972	32.7 °C22 December 1972	16.4 °C29 October 1972	22.3 °C	1,310 mm	56
1971	32.7 °C5 February 1971	14.0 °C21 December 1971	21.9 °C	1,546 mm	37
1970	34.4 °C18 February 1970	15.4 °C3 December 1970	22.2 °C	1,401 mm	66
1969	34.5 °C13 February 1969	17.0 °C5 November 1969	22.2 °C	1,519 mm	46
1968	32.8 °C4 April 1968	16.6 °C2 November 1968	22.1 °C	1,504 mm	37
1967	33.5 °C7 March 1967	16.5 °C20 January 1967	22.0 °C	1,435 mm	49
1966	34.5 °C6 March 1966	16.7 °C1 September 1966	22.7 °C	1,154 mm	101
1965	32.6 °C6 March 1965	16.6 °C4 February 1965	22.4 °C	1,051 mm	49
1964	34.6 °C26 February 1964	17.3 °C2 August 1964	22.6 °C	910 mm	109
1963	35.0 °C18 February 1963	17.1 °C2 January 1963	22.7 °C	1,027 mm	95
1962	34.2 °C3 February 1962	16.9 °C4 January 1962	22.1 °C	1,195 mm	68
1961	34.6 °C7 March 1961	16.6 °C1 August 1961	22.3 °C	1,111 mm	91
1960	33.5 °C25 February 1960	17.5 °C26 August 1960	22.4 °C	1,336 mm	82
1959	34.6 °C9 March 1959	17.1 °C23 June 1959	22.5 °C	1,072 mm	101
1958	35.2 °C3 March 1958	16.7 °C28 July 1958	22.3 °C	1,121 mm	83
1957	33.1 °C24 February 1957	17.0 °C11 January 1957	21.9 °C	1,237 mm	45
1956	33.9 °C11 February 1956	16.7 °C19 August 1956	21.7 °C	1,339 mm	46
1955	33.8 °C16 February 1955	16.8 °C22 September 1955	22.0 °C	1,362 mm	69
1954	33.2 °C4 March 1954	14.2 °C4 August 1954	21.8 °C	1,198 mm	41
1953	33.2 °C6 February 1953	16.7 °C10 August 1953	22.0 °C	1,357 mm	60
1952	33.6 °C3 March 1952	16.7 °C11 August 1952	22.2 °C	1,466 mm	66
1951	34.3 °C3 March 1951	17.6 °C13 July 1951	22.2 °C	1,433 mm	61
1950	33.1 °C25 February 1950	14.2 °C9 August 1950	21.9 °C	997 mm	67
1949	35.0 °C16 February 1949	16.9 °C16 August 1949	22.3 °C	1,234 mm	89
1948	33.5 °C18 February 1948	16.8 °C23 July 1948	22.0 °C	1,359 mm	67
1947	33.8 °C22 February 1947	15.8 °C10 September 1947	22.1 °C	1,125 mm	71
1946	35.4 °C23 February 1946	16.7 °C3 January 1946	22.1 °C	1,266 mm	87
1945	33.7 °C18 February 1945	16.0 °C5 February 1945	22.2 °C	1,333 mm	107
1944	33.9 °C9 February 1944	16.7 °C4 February 1944	22.3 °C	1,055 mm	94
1943	32.6 °C7 March 1943	15.4 °C26 July 1943	21.6 °C	972 mm	40
1942	33.5 °C12 February 1942	15.2 °C19 July 1942	21.8 °C	1,248 mm	67
1941	33.6 °C17 February 1941	16.3 °C22 December 1941	22.2 °C	1,102 mm	90
1940	33.0 °C20 February 1940	16.3 °C2 August 1940	21.9 °C	1,121 mm	50

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

29.1 °C

+1.2 °C

Hot days (≥ 30 °C)

143 d/yr

+57

Frost days (< 0 °C)

0 d/yr

Annual rainfall

1346 mm

+48 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	32.9 °C	+2.1 °C	6 mm	-5 mm
Feb	34.2 °C	+2.5 °C	3 mm	-17 mm
Mar	32.6 °C	+2.2 °C	64 mm	-13 mm
Apr	29.9 °C	+1.2 °C	143 mm	+15 mm
May	28.9 °C	+1.2 °C	119 mm	-27 mm
Jun	28.2 °C	+2.0 °C	116 mm	-22 mm
Jul	25.0 °C	0.0 °C	159 mm	+19 mm
Aug	24.9 °C	-0.1 °C	119 mm	-37 mm
Sep	26.5 °C	+0.9 °C	341 mm	+142 mm
Oct	27.0 °C	+0.7 °C	208 mm	+13 mm
Nov	28.9 °C	+1.2 °C	53 mm	-22 mm
Dec	31.1 °C	+1.7 °C	15 mm	+1 mm

The year's extremes

Hottest day

36.4 °C

8 Mar 2025

Coldest day

16.9 °C

11 Jan 2025

Wettest day

71.9 mm

8 Sep 2025

Windiest day

19.7 km/h

13 Mar 2025

Strongest gust

47.2 km/h

17 Mar 2025

Hottest feels-like

39.0 °C

15 Mar 2025

Coldest feels-like

18.2 °C

11 Jan 2025

Sunniest day

11.9 h

4 May 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 Tonga?

Tonga has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 22.6 °C and it receives 1,298 mm of precipitation per year.

What is the hottest day ever recorded in Tonga?

The hottest day measured in Tonga between 1940 and 2025 was 22 February 2016, reaching 37.3 °C.

What is the coldest day in Tonga?

The coldest day measured in Tonga between 1940 and 2025 was 10 December 1975, at 12.4 °C.

Does it snow in Tonga?

Almost never: Tonga sees virtually no snow, with about 0 frost days per year.

Has the climate of Tonga warmed?

Yes: Tonga warmed by +1.7 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Tonga?

The wettest day measured in Tonga between 1940 and 2025 was 8 July 2023, with 103 mm of rain in 24 hours.

What was the windiest day in Tonga?

The windiest day measured in Tonga between 1940 and 2025 was 17 March 1959, with winds reaching 20.0 km/h.

What is the warmest month in Tonga?

The warmest month in Tonga is February (24.5 °C on average); the coldest is August (21.0 °C).

How much does it rain in Tonga?

Tonga receives on average 1,298 mm of precipitation per year, spread over about 225 rainy days.

Is it sunny in Tonga?

Tonga gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.

Are there tropical nights in Tonga?

Yes: Tonga has on average 68 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Tonga?

In Tonga, between 1940 and 2025, the highest apparent temperature reached 39.7 °C on 28 March 2024, and the lowest was 11.3 °C on 10 December 1975.

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