Cilegon climate — normals and trends

Q: What is the climate of Cilegon?

Cilegon has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 26.5 °C and it receives 2,090 mm of precipitation per year.

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

The hottest day measured in Cilegon between 1940 and 2025 was 1 November 1997, reaching 33.4 °C.

Q: What is the coldest day in Cilegon?

The coldest day measured in Cilegon between 1940 and 2025 was 5 September 1977, at 20.7 °C.

Q: Does it snow in Cilegon?

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

Q: Has the climate of Cilegon warmed?

Yes: Cilegon warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

Q: What is the wettest day in Cilegon?

The wettest day measured in Cilegon between 1940 and 2025 was 9 November 1978, with 147 mm of rain in 24 hours.

Q: What was the windiest day in Cilegon?

The windiest day measured in Cilegon between 1940 and 2025 was 30 November 2017, with winds reaching 34.5 km/h.

Q: What is the warmest month in Cilegon?

The warmest month in Cilegon is May (27.0 °C on average); the coldest is January (26.1 °C).

Q: How much does it rain in Cilegon?

Cilegon receives on average 2,090 mm of precipitation per year, spread over about 285 rainy days.

Q: Is it sunny in Cilegon?

Cilegon gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.

Cilegon (Indonesia) has a tropical rainforest climate (Af) under the Köppen-Geiger classification. Its mean annual temperature is 26.5 °C and it receives 2,090 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 May (27.0 °C on average) and the coldest is January (26.1 °C). Rainfall peaks in January.

Cilegon averages 0 frost days, 82 hot days (≥ 30 °C) and 285 rainy days per year.

Cilegon has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.

The hottest day of the period reached 33.4 °C (on 1 November 1997) and the coldest 20.7 °C (on 5 September 1977).

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

CilegonBanten

coords: -6.01°, 106.05°
period: 1940–2025 · 86 yrs

AfTropical rainforestWarmest monthMayColdest monthJanuaryWettest monthJanuaryDriest monthAugust

Mean daily temperature

26.5°C

Average daily high

29.1°C

Average daily low

24.6°C

Annual rainfall

2,090mm

Sunshine / day

10.5h

Mean relative humidity

83%

Average peak wind

11.9km/h

Seasonal range

0.9°C

Frost days (< 0 °C)

0 d/yr

Hot days (≥ 30 °C)

82 d/yr

Rainy days (≥ 1 mm)

285 d/yr

Annual snowfall

0.0 cm

Average feels-like high

35.0 °C

Average feels-like low

28.9 °C

Average peak gust

27.2 km/h

Tropical nights (≥ 20 °C)

365 d/yr

Solar radiation

19.2 MJ/m²

Has the climate changed?

One stripe per year, 1940 to 2025

+1.4 °C

since 1940

+0.2 °C per decade · r² = 0.82 · 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

33.4 °C

1 November 1997

Coldest day

20.7 °C

5 September 1977

Wettest day

147 mm

9 November 1978

Windiest day

34.5 km/h

30 November 2017

Strongest gust

70.6 km/h

9 February 2001

Hottest feels-like

41.6 °C

16 November 2023

Coldest feels-like

22.8 °C

5 September 1977

Sunniest day

12.1 h

13 November 1948

Year	Hottest day	Coldest day	Annual mean	Rainfall	Hot days
2025	32.0 °C13 June 2025	24.1 °C15 August 2025	27.3 °C	2,612 mm	174
2024	32.7 °C28 October 2024	23.6 °C25 July 2024	27.7 °C	2,312 mm	247
2023	32.9 °C17 October 2023	22.8 °C1 September 2023	27.3 °C	1,648 mm	188
2022	32.0 °C14 May 2022	23.5 °C30 June 2022	27.0 °C	2,395 mm	133
2021	32.2 °C18 December 2021	23.6 °C27 July 2021	27.2 °C	2,118 mm	153
2020	32.0 °C11 May 2020	22.8 °C31 July 2020	27.2 °C	2,576 mm	154
2019	32.0 °C23 October 2019	21.8 °C6 August 2019	27.2 °C	1,607 mm	200
2018	32.1 °C16 November 2018	21.8 °C6 August 2018	27.1 °C	1,816 mm	145
2017	31.6 °C13 March 2017	23.8 °C21 September 2017	27.2 °C	1,966 mm	140
2016	32.0 °C15 May 2016	24.3 °C25 June 2016	27.4 °C	3,083 mm	184
2015	32.2 °C27 October 2015	22.4 °C15 September 2015	27.1 °C	1,841 mm	185
2014	32.6 °C10 October 2014	23.2 °C15 September 2014	27.0 °C	2,203 mm	170
2013	31.9 °C28 March 2013	23.9 °C14 July 2013	27.1 °C	2,631 mm	148
2012	31.7 °C15 October 2012	22.0 °C2 September 2012	27.0 °C	1,893 mm	139
2011	31.8 °C12 October 2011	23.4 °C27 August 2011	26.9 °C	1,778 mm	111
2010	32.4 °C22 May 2010	23.6 °C15 January 2010	27.1 °C	2,805 mm	144
2009	32.1 °C14 September 2009	22.8 °C14 July 2009	26.9 °C	1,892 mm	140
2008	31.2 °C29 November 2008	22.1 °C23 July 2008	26.6 °C	2,153 mm	65
2007	32.0 °C26 November 2007	22.6 °C12 September 2007	26.9 °C	1,958 mm	119
2006	31.8 °C2 October 2006	22.1 °C8 August 2006	26.8 °C	1,922 mm	124
2005	31.5 °C8 April 2005	23.3 °C10 August 2005	26.8 °C	2,057 mm	102
2004	31.5 °C18 October 2004	22.5 °C4 June 2004	26.8 °C	1,859 mm	118
2003	31.4 °C6 April 2003	21.7 °C6 August 2003	26.8 °C	1,925 mm	108
2002	32.4 °C17 October 2002	21.3 °C15 August 2002	26.8 °C	1,752 mm	123
2001	31.3 °C12 November 2001	21.9 °C6 July 2001	26.5 °C	2,305 mm	50
2000	31.3 °C11 September 2000	22.5 °C20 August 2000	26.5 °C	2,054 mm	62
1999	31.0 °C20 April 1999	22.4 °C21 August 1999	26.5 °C	2,313 mm	63
1998	32.1 °C26 May 1998	23.9 °C21 November 1998	27.1 °C	3,373 mm	165
1997	33.4 °C1 November 1997	21.0 °C18 August 1997	26.9 °C	1,391 mm	154
1996	31.2 °C7 May 1996	23.4 °C4 August 1996	26.7 °C	2,551 mm	93
1995	31.8 °C27 April 1995	23.3 °C30 July 1995	26.8 °C	2,660 mm	130
1994	31.7 °C12 October 1994	21.3 °C29 July 1994	26.7 °C	1,838 mm	112
1993	31.3 °C14 May 1993	23.3 °C23 January 1993	26.6 °C	2,310 mm	94
1992	31.8 °C10 June 1992	22.9 °C15 May 1992	26.3 °C	2,740 mm	63
1991	32.0 °C8 October 1991	22.6 °C18 August 1991	26.5 °C	2,132 mm	91
1990	31.8 °C21 April 1990	22.6 °C28 July 1990	26.5 °C	2,335 mm	76
1989	30.9 °C6 June 1989	23.2 °C31 July 1989	26.5 °C	2,227 mm	55
1988	31.4 °C2 June 1988	23.3 °C30 July 1988	26.6 °C	2,182 mm	58
1987	32.4 °C21 September 1987	23.0 °C16 July 1987	26.8 °C	1,901 mm	141
1986	30.8 °C2 December 1986	21.1 °C19 August 1986	26.4 °C	2,440 mm	41
1985	31.2 °C29 March 1985	22.9 °C7 July 1985	26.5 °C	2,065 mm	44
1984	31.1 °C29 October 1984	22.3 °C16 September 1984	26.3 °C	2,821 mm	27
1983	32.0 °C19 August 1983	23.2 °C6 August 1983	26.9 °C	2,660 mm	113
1982	31.7 °C27 October 1982	21.1 °C26 August 1982	26.5 °C	2,016 mm	65
1981	31.3 °C24 May 1981	23.3 °C14 January 1981	26.5 °C	2,793 mm	59
1980	31.1 °C24 May 1980	23.4 °C19 July 1980	26.6 °C	2,361 mm	63
1979	31.6 °C16 October 1979	22.6 °C21 July 1979	26.5 °C	2,457 mm	86
1978	31.1 °C9 March 1978	23.2 °C28 September 1978	26.5 °C	2,889 mm	61
1977	32.3 °C26 October 1977	20.7 °C5 September 1977	26.4 °C	2,130 mm	51
1976	31.3 °C21 October 1976	22.3 °C15 September 1976	26.2 °C	1,837 mm	38
1975	30.6 °C21 May 1975	22.9 °C11 July 1975	26.2 °C	2,207 mm	25
1974	31.2 °C19 October 1974	22.9 °C9 January 1974	26.1 °C	2,305 mm	27
1973	31.3 °C16 October 1973	23.2 °C9 August 1973	26.5 °C	3,060 mm	42
1972	32.6 °C18 October 1972	22.5 °C9 June 1972	26.2 °C	1,545 mm	59
1971	30.8 °C18 June 1971	22.4 °C13 September 1971	25.9 °C	1,831 mm	20
1970	31.2 °C28 April 1970	23.0 °C31 August 1970	26.4 °C	2,136 mm	51
1969	31.8 °C16 August 1969	22.7 °C29 August 1969	26.5 °C	1,490 mm	75
1968	31.1 °C1 April 1968	22.7 °C11 November 1968	26.1 °C	2,338 mm	29
1967	31.9 °C13 October 1967	22.3 °C30 July 1967	26.1 °C	1,793 mm	55
1966	31.0 °C11 May 1966	22.6 °C23 July 1966	26.3 °C	1,908 mm	36
1965	31.6 °C25 September 1965	22.0 °C31 August 1965	26.2 °C	1,717 mm	62
1964	31.2 °C2 May 1964	22.6 °C2 August 1964	26.4 °C	2,016 mm	57
1963	31.9 °C3 October 1963	21.8 °C26 August 1963	26.6 °C	1,516 mm	148
1962	31.4 °C10 May 1962	22.5 °C4 August 1962	26.3 °C	2,488 mm	49
1961	32.4 °C29 September 1961	21.5 °C9 August 1961	26.4 °C	1,816 mm	98
1960	31.4 °C26 October 1960	23.4 °C2 July 1960	26.5 °C	2,107 mm	48
1959	32.6 °C22 October 1959	22.1 °C5 August 1959	26.3 °C	2,180 mm	59
1958	31.3 °C6 June 1958	23.3 °C17 June 1958	26.5 °C	2,803 mm	106
1957	32.1 °C11 November 1957	22.6 °C18 August 1957	26.4 °C	1,790 mm	60
1956	30.7 °C8 May 1956	22.1 °C23 September 1956	26.0 °C	1,921 mm	20
1955	30.6 °C7 October 1955	22.9 °C27 July 1955	25.8 °C	2,511 mm	16
1954	30.7 °C5 March 1954	22.7 °C13 September 1954	25.8 °C	2,482 mm	10
1953	31.5 °C21 October 1953	22.2 °C9 August 1953	26.2 °C	1,200 mm	56
1952	30.6 °C8 March 1952	22.3 °C15 July 1952	26.1 °C	2,012 mm	16
1951	31.6 °C3 November 1951	22.2 °C2 September 1951	26.1 °C	1,596 mm	35
1950	30.0 °C20 March 1950	22.4 °C22 November 1950	25.9 °C	1,765 mm	1
1949	32.1 °C14 April 1949	21.8 °C10 August 1949	26.2 °C	726 mm	89
1948	31.2 °C16 October 1948	22.2 °C8 January 1948	26.1 °C	871 mm	26
1947	29.9 °C5 March 1947	22.2 °C30 September 1947	25.9 °C	1,500 mm	0
1946	30.8 °C8 November 1946	21.4 °C18 August 1946	25.8 °C	1,544 mm	9
1945	30.2 °C9 October 1945	21.7 °C18 September 1945	25.6 °C	1,862 mm	3
1944	30.1 °C10 October 1944	22.1 °C6 August 1944	25.6 °C	1,996 mm	1
1943	30.1 °C1 July 1943	21.7 °C17 July 1943	25.6 °C	1,429 mm	6
1942	29.9 °C17 October 1942	22.4 °C23 November 1942	25.6 °C	2,245 mm	0
1941	30.8 °C30 August 1941	21.9 °C21 June 1941	25.9 °C	1,816 mm	25
1940	31.2 °C4 November 1940	21.7 °C18 August 1940	25.8 °C	1,625 mm	30

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

29.8 °C

+0.7 °C

Hot days (≥ 30 °C)

174 d/yr

+92

Frost days (< 0 °C)

0 d/yr

Annual rainfall

2612 mm

+522 mm

Month by month

	High	vs. normal	Precipitation	vs. normal
Jan	29.2 °C	+0.8 °C	337 mm	+72 mm
Feb	29.8 °C	+1.2 °C	205 mm	-43 mm
Mar	30.0 °C	+1.0 °C	198 mm	-27 mm
Apr	29.8 °C	+0.4 °C	294 mm	+86 mm
May	30.5 °C	+0.9 °C	246 mm	+85 mm
Jun	29.8 °C	+0.5 °C	220 mm	+102 mm
Jul	29.7 °C	+0.7 °C	84 mm	-14 mm
Aug	29.5 °C	+0.4 °C	183 mm	+94 mm
Sep	29.9 °C	+0.5 °C	137 mm	+41 mm
Oct	30.3 °C	+0.6 °C	169 mm	+30 mm
Nov	29.7 °C	+0.5 °C	284 mm	+81 mm
Dec	29.3 °C	+0.7 °C	256 mm	+15 mm

The year's extremes

Hottest day

32.0 °C

13 Jun 2025

Coldest day

24.1 °C

15 Aug 2025

Wettest day

116.0 mm

18 Jun 2025

Windiest day

26.8 km/h

18 Dec 2025

Strongest gust

55.4 km/h

20 Nov 2025

Hottest feels-like

40.6 °C

26 Sep 2025

Coldest feels-like

27.2 °C

18 Dec 2025

Sunniest day

12.0 h

3 Jan 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 Cilegon?

Cilegon has a tropical rainforest climate (Köppen Af). Over 1940-2025, the average annual temperature is 26.5 °C and it receives 2,090 mm of precipitation per year.

What is the hottest day ever recorded in Cilegon?

The hottest day measured in Cilegon between 1940 and 2025 was 1 November 1997, reaching 33.4 °C.

What is the coldest day in Cilegon?

The coldest day measured in Cilegon between 1940 and 2025 was 5 September 1977, at 20.7 °C.

Does it snow in Cilegon?

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

Has the climate of Cilegon warmed?

Yes: Cilegon warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.

What is the wettest day in Cilegon?

The wettest day measured in Cilegon between 1940 and 2025 was 9 November 1978, with 147 mm of rain in 24 hours.

What was the windiest day in Cilegon?

The windiest day measured in Cilegon between 1940 and 2025 was 30 November 2017, with winds reaching 34.5 km/h.

What is the warmest month in Cilegon?

The warmest month in Cilegon is May (27.0 °C on average); the coldest is January (26.1 °C).

How much does it rain in Cilegon?

Cilegon receives on average 2,090 mm of precipitation per year, spread over about 285 rainy days.

Is it sunny in Cilegon?

Cilegon gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.

Are there tropical nights in Cilegon?

Yes: Cilegon has on average 365 tropical nights per year (temperature staying above 20 °C), over 1940-2025.

What was the most extreme apparent temperature in Cilegon?

In Cilegon, between 1940 and 2025, the highest apparent temperature reached 41.6 °C on 16 November 2023, and the lowest was 22.8 °C on 5 September 1977.

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