Monthly Climate
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Best time to visit Rio das Ostras

July is the best time to visit Rio das Ostras for general sightseeing, with average highs of 25 °C and about 5 wet days. The comfortable season runs roughly May to August.

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 July comfort 91/100
A beach holiday June sea 23 °C
The least cloud July 42 % average cloud cover
The least rain July 31 mm
Warmth February 30 °C
Cooler weather July 25 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days Beach
1 July 91 25 °C 5 86
2 June 89 25 °C 6 87
3 August 88 25 °C 6 84
4 May 82 25 °C 9 83
5 September 79 26 °C 10 76
6 October 72 27 °C 12 75
7 April 70 27 °C 12 82
8 November 63 27 °C 17 71
9 February 59 30 °C 12 77
10 March 56 29 °C 18 74
11 December 56 28 °C 18 73
12 January 56 29 °C 16 72

For a beach holiday

June scores highest, with a sea temperature of 23 °C and air temperatures around 25 °C. The sea never reaches 20 °C here.

Month Sea Air Sunshine Beach score
January 24 °C 29 °C 68 % 72
February 24 °C 30 °C 59 % 77
March 25 °C 29 °C 63 % 74
April 25 °C 27 °C 52 % 82
May 24 °C 25 °C 49 % 83
June 23 °C 25 °C 43 % 87
July 22 °C 25 °C 42 % 86
August 22 °C 25 °C 43 % 84
September 21 °C 26 °C 55 % 76
October 22 °C 27 °C 66 % 75
November 22 °C 27 °C 73 % 71
December 24 °C 28 °C 70 % 73

When to think twice

January scores lowest with about 16 wet days and highs near 29 °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 29.4 °C 199 mm 68 %
February 29.9 °C 132 mm 59 %
March 28.7 °C 171 mm 63 %
April 27.3 °C 84 mm 52 %
May 25.3 °C 64 mm 49 %
June 24.8 °C 33 mm 43 %
July 24.5 °C 31 mm 42 %
August 25.0 °C 34 mm 43 %
September 25.8 °C 71 mm 55 %
October 26.7 °C 105 mm 66 %
November 26.9 °C 192 mm 73 %
December 28.4 °C 209 mm 70 %

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.