Monthly Climate
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Best time to visit Chongming

October is the best time to visit Chongming for general sightseeing, with average highs of 22 °C and about 5 wet days. 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 October comfort 94/100
A beach holiday September sea 25 °C
The least cloud October 51 % average cloud cover
The least rain December 43 mm
Warmth July 30 °C
Cooler weather January 7.4 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 October 94 22 °C 5 74
2 May 85 22 °C 9 56
3 November 80 16 °C 7 37
4 April 77 17 °C 10 23
5 September 74 26 °C 10 85
6 June 69 26 °C 14 69
7 March 56 12 °C 10 10
8 December 55 10 °C 6 19
9 July 51 30 °C 14 75
10 August 50 30 °C 15 72
11 February 44 8.6 °C 8 14
12 January 40 7.4 °C 8 14

For a beach holiday

September scores highest, with a sea temperature of 25 °C and air temperatures around 26 °C. The sea is above 20 °C from June to October.

Month Sea Air Sunshine Beach score
January 8.0 °C 7.4 °C 60 % 14
February 6.9 °C 8.6 °C 62 % 14
March 9.2 °C 12 °C 66 % 10
April 13 °C 17 °C 66 % 23
May 18 °C 22 °C 67 % 56
June 22 °C 26 °C 78 % 69
July 26 °C 30 °C 69 % 75
August 27 °C 30 °C 60 % 72
September 25 °C 26 °C 56 % 85
October 22 °C 22 °C 51 % 74
November 17 °C 16 °C 53 % 37
December 12 °C 10 °C 51 % 19

When to think twice

January scores lowest with about 8 wet days and highs near 7.4 °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 7.4 °C 62 mm 60 %
February 8.6 °C 60 mm 62 %
March 12.2 °C 91 mm 66 %
April 17.4 °C 99 mm 66 %
May 22.4 °C 120 mm 67 %
June 25.6 °C 258 mm 78 %
July 29.6 °C 170 mm 69 %
August 29.5 °C 160 mm 60 %
September 26.0 °C 99 mm 56 %
October 21.5 °C 60 mm 51 %
November 16.3 °C 59 mm 53 %
December 10.1 °C 43 mm 51 %

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.