Monthly Climate
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Best time to visit Cilegon

August is the best time to visit Cilegon for general sightseeing, with average highs of 30 °C and about 16 wet days.

It depends what you are going for

One month rarely wins on everything. These are the best months on each measure taken on its own.

If you want Best month On that measure
Sightseeing and walking August comfort 55/100
A beach holiday January sea 29 °C
The least cloud August 60 % average cloud cover
The least rain August 69 mm
Warmth October 30 °C
Cooler weather January 28 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 August 55 30 °C 16 68
2 September 54 30 °C 15 66
3 July 54 29 °C 17 68
4 January 50 28 °C 28 71
5 February 50 29 °C 26 70
6 December 50 28 °C 26 69
7 June 49 29 °C 20 66
8 March 49 29 °C 27 69
9 November 48 29 °C 24 66
10 April 48 29 °C 26 67
11 May 47 29 °C 23 65
12 October 46 30 °C 20 64

For a beach holiday

January scores highest, with a sea temperature of 29 °C and air temperatures around 28 °C. The sea never reaches 20 °C here.

Month Sea Air Sunshine Beach score
January 29 °C 28 °C 89 % 71
February 29 °C 29 °C 90 % 70
March 29 °C 29 °C 86 % 69
April 30 °C 29 °C 81 % 67
May 30 °C 29 °C 69 % 65
June 30 °C 29 °C 62 % 66
July 29 °C 29 °C 61 % 68
August 29 °C 30 °C 60 % 68
September 29 °C 30 °C 65 % 66
October 29 °C 30 °C 73 % 64
November 30 °C 29 °C 84 % 66
December 29 °C 28 °C 90 % 69

When to think twice

October scores lowest with about 20 wet days and highs near 30 °C. That does not make it a bad month — it depends entirely on what you are travelling for. The numbers are all here; the judgement is yours.

The full year

Month Avg high Rainfall Cloud
January 28.4 °C 290 mm 89 %
February 28.6 °C 269 mm 90 %
March 28.9 °C 241 mm 86 %
April 29.2 °C 209 mm 81 %
May 29.4 °C 159 mm 69 %
June 29.2 °C 119 mm 62 %
July 29.2 °C 92 mm 61 %
August 29.6 °C 69 mm 60 %
September 30.3 °C 72 mm 65 %
October 30.4 °C 129 mm 73 %
November 29.5 °C 215 mm 84 %
December 28.4 °C 291 mm 90 %

Data sources and method

Normal period
1991–2020
Dataset version
era5-1991-2020-scores1.1
Last processed

Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: comfort score, beach score, season boundaries. Full formulas are on the methodology page.

Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.