ClimateAverages

Fort Collins Weather in September

JanFebMarAprMayJunJulAugSepOctNovDec
September daytime high
24.3°C
September overnight low
6.6°C
September average
15.6°C

In September, Fort Collins typically sees daytime highs of 24.3°C and overnight lows around 6.6°C. Compared to the annual average high of 16.9°C, September runs +7.5°C.

vs. annual avg high
+7.5°C
Rank among 12 months
#4 warmest
Hottest year overall
1933

Where September ranks in Fort Collins

JanFebMarAprMayJunJulAugSep24°OctNovDec

FAQ

What is the average temperature in Fort Collins in September?

September in Fort Collins averages a daytime high of 24.3°C and an overnight low of 6.6°C.

Is September warm or cold in Fort Collins?

September runs +7.5°C compared to Fort Collins's annual average high of 16.9°C, ranking #4 of 12 months by warmth.

What should I pack for Fort Collins in September?

Plan for daytime highs near 24.3°C and cooler evenings around 6.6°C.

Other months for Fort Collins

JanuaryFebruaryMarchAprilMayJuneJulyAugustOctoberNovemberDecember

September in nearby cities

DenverColorado SpringsAuroraLakewoodThorntonArvadaWestminsterCentennialPuebloBoulderGreeleyHighlands Ranch