Monthly Climate
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Best time to visit Rosario

September is the best time to visit Rosario for general sightseeing, with average highs of 21 °C and about 6 wet days. The comfortable season runs roughly August 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 92/100
The least cloud January 38 % average cloud cover
The least rain July 36 mm
Warmth January 30 °C
Cooler weather July 15 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 September 92 21 °C 6
2 April 91 23 °C 8
3 October 88 23 °C 10
4 May 88 19 °C 6
5 November 86 26 °C 8
6 August 85 18 °C 5
7 March 84 27 °C 8
8 February 78 28 °C 8
9 December 78 29 °C 9
10 June 77 16 °C 5
11 July 74 15 °C 5
12 January 73 30 °C 8

When to think twice

January scores lowest with about 8 wet days and highs near 30 °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 30.1 °C 103 mm 38 %
February 28.5 °C 111 mm 41 %
March 26.6 °C 125 mm 40 %
April 22.7 °C 104 mm 45 %
May 18.9 °C 69 mm 55 %
June 16.1 °C 40 mm 54 %
July 15.5 °C 36 mm 49 %
August 18.2 °C 55 mm 43 %
September 20.5 °C 63 mm 44 %
October 23.3 °C 115 mm 49 %
November 26.3 °C 113 mm 42 %
December 28.8 °C 106 mm 41 %

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.