Monthly Climate
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Best time to visit Chiba

May is the best time to visit Chiba for general sightseeing, with average highs of 22 °C and about 12 wet days. The comfortable season runs roughly May to June. The sea stays above 20 °C from June to October.

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 May comfort 81/100
A beach holiday August sea 26 °C
The least cloud January 46 % average cloud cover
The least rain December 79 mm
Warmth August 30 °C
Cooler weather January 8.6 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 May 81 22 °C 12 47
2 October 79 21 °C 14 55
3 June 73 24 °C 15 62
4 April 70 17 °C 12 21
5 November 69 16 °C 11 34
6 September 67 26 °C 15 75
7 July 61 28 °C 12 78
8 August 58 30 °C 11 81
9 December 51 11 °C 8 21
10 March 49 12 °C 13 4
11 February 42 9.4 °C 9 12
12 January 42 8.6 °C 8 15

For a beach holiday

August scores highest, with a sea temperature of 26 °C and air temperatures around 30 °C. The sea is above 20 °C from June to October.

Month Sea Air Sunshine Beach score
January 14 °C 8.6 °C 46 % 15
February 13 °C 9.4 °C 54 % 12
March 13 °C 12 °C 60 % 4
April 15 °C 17 °C 63 % 21
May 18 °C 22 °C 69 % 47
June 21 °C 24 °C 80 % 62
July 23 °C 28 °C 73 % 78
August 26 °C 30 °C 62 % 81
September 25 °C 26 °C 66 % 75
October 22 °C 21 °C 63 % 55
November 19 °C 16 °C 58 % 34
December 16 °C 11 °C 49 % 21

When to think twice

January scores lowest with about 8 wet days and highs near 8.6 °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 8.6 °C 87 mm 46 %
February 9.4 °C 85 mm 54 %
March 12.5 °C 143 mm 60 %
April 17.3 °C 136 mm 63 %
May 21.6 °C 147 mm 69 %
June 24.5 °C 189 mm 80 %
July 28.2 °C 154 mm 73 %
August 29.6 °C 118 mm 62 %
September 26.2 °C 208 mm 66 %
October 21.0 °C 242 mm 63 %
November 16.0 °C 122 mm 58 %
December 11.1 °C 79 mm 49 %

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.