Monthly Climate
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Best time to visit Viamão

May is the best time to visit Viamão for general sightseeing, with average highs of 21 °C and about 9 wet days. The comfortable season runs roughly April to November.

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 87/100
The least cloud March 52 % average cloud cover
The least rain April 105 mm
Warmth January 28 °C
Cooler weather July 18 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 May 87 21 °C 9
2 April 85 24 °C 10
3 September 83 21 °C 11
4 August 83 20 °C 10
5 October 82 23 °C 12
6 June 82 19 °C 9
7 November 81 25 °C 11
8 July 78 18 °C 10
9 March 73 27 °C 12
10 December 71 28 °C 12
11 February 65 28 °C 14
12 January 65 28 °C 14

When to think twice

January scores lowest with about 14 wet days and highs near 28 °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 28.4 °C 138 mm 56 %
February 28.1 °C 129 mm 56 %
March 26.9 °C 121 mm 52 %
April 24.4 °C 105 mm 55 %
May 20.7 °C 107 mm 59 %
June 18.7 °C 116 mm 61 %
July 18.1 °C 139 mm 58 %
August 20.0 °C 123 mm 55 %
September 20.9 °C 149 mm 61 %
October 23.1 °C 173 mm 64 %
November 25.2 °C 124 mm 54 %
December 27.6 °C 129 mm 54 %

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.