Monthly Climate
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Best time to visit Karaj

October is the best time to visit Karaj for general sightseeing, with average highs of 22 °C and about 3 wet days.

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 October comfort 95/100
The least cloud September 7 % average cloud cover
The least rain July 1 mm
Warmth July 35 °C
Cooler weather January 5.3 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 October 95 22 °C 3
2 May 92 26 °C 3
3 April 85 19 °C 8
4 September 82 29 °C 0
5 June 73 32 °C 0
6 August 64 34 °C 0
7 November 63 13 °C 6
8 July 61 35 °C 0
9 March 57 13 °C 9
10 December 42 7.6 °C 7
11 February 40 7.5 °C 8
12 January 37 5.3 °C 7

When to think twice

January scores lowest with about 7 wet days and highs near 5.3 °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 5.3 °C 38 mm 39 %
February 7.5 °C 41 mm 40 %
March 13.0 °C 50 mm 43 %
April 19.3 °C 46 mm 44 %
May 25.7 °C 16 mm 34 %
June 31.9 °C 2 mm 14 %
July 34.9 °C 1 mm 11 %
August 34.0 °C 2 mm 7 %
September 29.2 °C 2 mm 7 %
October 21.9 °C 16 mm 24 %
November 13.0 °C 38 mm 38 %
December 7.6 °C 39 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.