Monthly Climate
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Best time to visit Castanhal

September is the best time to visit Castanhal for general sightseeing, with average highs of 32 °C and about 8 wet days. The comfortable season runs roughly July 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 September comfort 60/100
The least cloud August 37 % average cloud cover
The least rain October 34 mm
Warmth October 33 °C
Cooler weather March 29 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 September 60 32 °C 8
2 October 58 33 °C 8
3 November 57 33 °C 9
4 August 56 31 °C 13
5 July 52 30 °C 18
6 March 50 29 °C 30
7 February 50 29 °C 27
8 April 50 29 °C 29
9 June 49 30 °C 21
10 May 49 29 °C 28
11 January 48 30 °C 27
12 December 48 32 °C 17

When to think twice

December scores lowest with about 17 wet days and highs near 32 °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 29.9 °C 261 mm 81 %
February 29.1 °C 343 mm 86 %
March 29.0 °C 444 mm 88 %
April 29.0 °C 419 mm 88 %
May 29.5 °C 271 mm 75 %
June 29.8 °C 124 mm 53 %
July 30.1 °C 93 mm 44 %
August 31.2 °C 52 mm 37 %
September 32.3 °C 35 mm 38 %
October 33.1 °C 34 mm 46 %
November 33.0 °C 52 mm 58 %
December 31.9 °C 110 mm 67 %

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.