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Grand Junction weather in September 2025
Expect 27°C daytime maximum temperatures in the shade with on average 10 hours of sunshine per day in Grand Junction in September. Check more long-term weather averages for Grand Junction in September before you book your next holiday to Colorado in 2025/2026.
- 2727°C max day temperature
- 10 hours of sunshine per day
- 66 days with some rainfall
- 1010°C min night temperature
- 1212 hours of daylight per day
- LLow heat & humidity
- 2121 mm of monthly rainfall
- 77 (High) UV index
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Recommended for Colorado
The September weather guide for Colorado (Grand Junction) shows long term weather averages processed from data supplied by CRU (University of East Anglia), the Met Office & the Netherlands Meteorological Institute. Find out more about our data sources.
Metric (°C / mm) | Imperial (°F / inches)
More about the USA
How hot is it in Grand Junction in September?
Daytime temperatures usually reach 27°C in Grand Junction in September with low heat and humidity, falling to 10°C at night.
How sunny is it in Grand Junction in September?
There are normally 10 hours of bright sunshine each day in Grand Junction in September - that's 78% of daylight hours.
Does it rain in Grand Junction in September?
There are usually 6 days with some rain in Grand Junction in September and the average monthly rainfall is 21mm.
Grand Junction September sunrise & sunset times
Browse the sunrise and sunset times for Grand Junction in September 2025. Select a month to view Grand Junction sunrise and sunset times for the next 12 months.
JanFebMarAprMayJunJulAugSepOctNovDec
Date | Sunrise times | Sunset times |
---|---|---|
Monday, 1st September 2025 | 05:43 | 18:44 |
Monday, 15th September 2025 | 05:56 | 18:22 |
Tuesday, 30th September 2025 | 06:10 | 17:58 |
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