Monthly Climate
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Best time to visit Saint-Louis

January is the best time to visit Saint-Louis for general sightseeing, with average highs of 28 °C and about 0 wet days. The comfortable season runs roughly December to May. The sea stays above 20 °C from May to December.

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 January comfort 83/100
A beach holiday June sea 24 °C
The least cloud May 24 % average cloud cover
The least rain May 0 mm
Warmth October 32 °C
Cooler weather January 28 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 January 83 28 °C 0 86
2 February 82 28 °C 0 82
3 March 80 28 °C 0 82
4 April 80 28 °C 0 84
5 December 78 29 °C 0 95
6 May 77 28 °C 0 90
7 June 71 29 °C 0 98
8 November 68 31 °C 0 92
9 July 66 30 °C 2 98
10 October 61 32 °C 3 88
11 August 58 30 °C 9 83
12 September 57 31 °C 8 80

For a beach holiday

June scores highest, with a sea temperature of 24 °C and air temperatures around 29 °C. The sea is above 20 °C from May to December.

Month Sea Air Sunshine Beach score
January 20 °C 28 °C 42 % 86
February 19 °C 28 °C 39 % 82
March 19 °C 28 °C 27 % 82
April 19 °C 28 °C 27 % 84
May 21 °C 28 °C 24 % 90
June 24 °C 29 °C 28 % 98
July 26 °C 30 °C 45 % 98
August 28 °C 30 °C 61 % 83
September 28 °C 31 °C 55 % 80
October 28 °C 32 °C 39 % 88
November 25 °C 31 °C 48 % 92
December 22 °C 29 °C 48 % 95

When to think twice

September scores lowest with about 8 wet days and highs near 31 °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 27.5 °C 3 mm 42 %
February 27.9 °C 2 mm 39 %
March 28.4 °C under 1 mm 27 %
April 28.0 °C under 1 mm 27 %
May 28.3 °C under 1 mm 24 %
June 28.9 °C 1 mm 28 %
July 29.5 °C 16 mm 45 %
August 30.1 °C 67 mm 61 %
September 31.0 °C 62 mm 55 %
October 32.3 °C 17 mm 39 %
November 31.5 °C 1 mm 48 %
December 29.0 °C 2 mm 48 %

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.