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.

  • 27°C maximum daytime temperature in September in Grand Junction27
    27°C max day temperature
  • 10 hours of sunshine per day
  • 6 days with some rainfall in September in Grand Junction6
    6 days with some rainfall
  • 10°C minimum night-time temperature in September in Grand Junction10
    10°C min night temperature
  • 12 hours of daylight per day in September in Grand Junction12
    12 hours of daylight per day
  • Low heat & humidity in September in Grand JunctionL
    Low heat & humidity
  • 21 mm monthly rainfall in September in Grand Junction21
    21 mm of monthly rainfall
  • UV (maximum) index 7 (High) in September in Grand Junction7
    7 (High) UV index

More about Grand Junction

Grand Junction by month

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Recommended for Colorado

  • Save up to 30% on car hire in Black Friday sale
  • Discount varies by country & travel period
  • Browse exclusive car hire company offers

Expires at 00:00 on Monday 1st Dec 2025 · View all Zest Car Rental offers

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)

Back to top

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

Related posts

Popular travel offers

Explore holidays in the sun for less

More holidays

Airport parking

More parking

Airport lounges

More lounges

Top ^