Monthly Climate
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Best time to visit Fort Collins

September is the best time to visit Fort Collins for general sightseeing, with average highs of 25 °C and about 6 wet days. The comfortable season runs roughly August to September.

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 93/100
The least cloud September 37 % average cloud cover
The least rain January 16 mm
Warmth July 30 °C
Cooler weather December 4.6 °C

Ranked by comfort

# Month Comfort / 100 Avg high Wet days
1 September 93 25 °C 6
2 June 87 26 °C 8
3 August 84 29 °C 6
4 July 80 30 °C 7
5 May 80 20 °C 12
6 October 77 17 °C 6
7 April 64 16 °C 9
8 March 54 12 °C 6
9 November 49 9.7 °C 5
10 February 41 6.6 °C 5
11 January 39 5.1 °C 4
12 December 39 4.6 °C 4

When to think twice

December scores lowest with about 4 wet days and highs near 4.6 °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 5.1 °C 16 mm 45 %
February 6.6 °C 17 mm 49 %
March 11.9 °C 38 mm 50 %
April 15.9 °C 62 mm 54 %
May 20.5 °C 87 mm 55 %
June 26.4 °C 53 mm 44 %
July 29.8 °C 45 mm 41 %
August 28.7 °C 39 mm 42 %
September 24.8 °C 39 mm 37 %
October 17.4 °C 38 mm 41 %
November 9.7 °C 25 mm 44 %
December 4.6 °C 16 mm 44 %

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.