Monthly Climate
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Best time to visit Santa Rosa

May is the best time to visit Santa Rosa for general sightseeing, with average highs of 24 °C and about 4 wet days. The comfortable season runs roughly April to June.

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 95/100
The least cloud July 16 % average cloud cover
The least rain July 0 mm
Warmth July 30 °C
Cooler weather December 14 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 May 95 24 °C 4
2 October 94 25 °C 3
3 April 89 20 °C 6
4 June 87 28 °C 1
5 September 85 29 °C 1
6 November 83 18 °C 6
7 July 82 30 °C 0
8 August 82 30 °C 0
9 March 75 18 °C 9
10 February 68 16 °C 10
11 January 61 15 °C 10
12 December 61 14 °C 10

When to think twice

December scores lowest with about 10 wet days and highs near 14 °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 14.8 °C 146 mm 62 %
February 16.2 °C 148 mm 60 %
March 18.0 °C 111 mm 57 %
April 20.4 °C 50 mm 47 %
May 24.1 °C 28 mm 39 %
June 28.3 °C 7 mm 25 %
July 29.9 °C under 1 mm 16 %
August 29.9 °C 1 mm 17 %
September 28.9 °C 3 mm 19 %
October 24.9 °C 33 mm 33 %
November 18.5 °C 75 mm 50 %
December 14.5 °C 150 mm 59 %

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.