Monthly Climate
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Best time to visit Sullana

August is the best time to visit Sullana for general sightseeing, with average highs of 29 °C and about 0 wet days. The comfortable season runs roughly June 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 August comfort 82/100
The least cloud August 40 % average cloud cover
The least rain August 0 mm
Warmth March 33 °C
Cooler weather August 29 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 August 82 29 °C 0
2 July 81 29 °C 0
3 September 80 29 °C 0
4 October 78 30 °C 1
5 June 77 30 °C 1
6 November 75 31 °C 2
7 May 71 32 °C 2
8 December 70 32 °C 4
9 January 65 33 °C 5
10 April 64 33 °C 7
11 February 58 33 °C 10
12 March 56 33 °C 11

When to think twice

March scores lowest with about 11 wet days and highs near 33 °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 32.8 °C 36 mm 72 %
February 32.5 °C 80 mm 83 %
March 32.8 °C 119 mm 83 %
April 32.6 °C 45 mm 66 %
May 31.8 °C 7 mm 52 %
June 29.9 °C 2 mm 45 %
July 28.8 °C 1 mm 43 %
August 28.7 °C under 1 mm 40 %
September 29.3 °C 1 mm 52 %
October 29.9 °C 3 mm 62 %
November 30.5 °C 7 mm 67 %
December 31.7 °C 17 mm 66 %

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.