Monthly Climate
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Best time to visit San Juan

February is the best time to visit San Juan for general sightseeing, with average highs of 28 °C and about 8 wet days. The comfortable season runs roughly December to April.

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 February comfort 70/100
A beach holiday February sea 26 °C
The least cloud February 36 % average cloud cover
The least rain February 31 mm
Warmth August 31 °C
Cooler weather January 28 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 February 70 28 °C 8 89
2 January 68 28 °C 10 84
3 March 68 29 °C 9 86
4 December 63 28 °C 13 78
5 April 61 30 °C 12 78
6 November 54 29 °C 18 71
7 May 52 30 °C 16 70
8 June 51 31 °C 14 69
9 July 46 31 °C 16 65
10 October 46 30 °C 20 66
11 August 43 31 °C 18 63
12 September 42 31 °C 20 64

For a beach holiday

February scores highest, with a sea temperature of 26 °C and air temperatures around 28 °C. The sea never reaches 20 °C here.

Month Sea Air Sunshine Beach score
January 27 °C 28 °C 38 % 84
February 26 °C 28 °C 36 % 89
March 26 °C 29 °C 39 % 86
April 27 °C 30 °C 44 % 78
May 27 °C 30 °C 60 % 70
June 28 °C 31 °C 58 % 69
July 28 °C 31 °C 54 % 65
August 29 °C 31 °C 57 % 63
September 29 °C 31 °C 63 % 64
October 29 °C 30 °C 58 % 66
November 28 °C 29 °C 52 % 71
December 27 °C 28 °C 41 % 78

When to think twice

September scores lowest with about 20 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 27.9 °C 43 mm 38 %
February 28.5 °C 31 mm 36 %
March 29.3 °C 41 mm 39 %
April 29.9 °C 73 mm 44 %
May 30.4 °C 108 mm 60 %
June 31.2 °C 62 mm 58 %
July 31.4 °C 68 mm 54 %
August 31.5 °C 82 mm 57 %
September 31.1 °C 128 mm 63 %
October 30.3 °C 113 mm 58 %
November 28.9 °C 105 mm 52 %
December 28.1 °C 49 mm 41 %

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.