La Grande weather in September 2025

Expect 21°C daytime maximum temperatures in the shade with on average 9 hours of sunshine per day in La Grande in September. Check more long-term weather averages for La Grande in September before you book your next holiday to Oregon in 2025/2026.

  • 21°C maximum daytime temperature in September in La Grande21
    21°C max day temperature
  • 9 hours of sunshine per day
  • 6 days with some rainfall in September in La Grande6
    6 days with some rainfall
  • 4°C minimum night-time temperature in September in La Grande4
    4°C min night temperature
  • 12 hours of daylight per day in September in La Grande12
    12 hours of daylight per day
  • No heat & humidity in September in La Grande0
    No heat & humidity
  • 27 mm monthly rainfall in September in La Grande27
    27 mm of monthly rainfall
  • UV (maximum) index 6 (High) in September in La Grande6
    6 (High) UV index

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The September weather guide for Oregon (La Grande) 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)

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How hot is it in La Grande in September?

Daytime temperatures usually reach 21°C in La Grande in September, falling to 4°C at night.

How sunny is it in La Grande in September?

There are normally 9 hours of bright sunshine each day in La Grande in September - that's 73% of daylight hours.

Does it rain in La Grande in September?

There are usually 6 days with some rain in La Grande in September and the average monthly rainfall is 27mm.

La Grande September sunrise & sunset times

Browse the sunrise and sunset times for La Grande in September 2025. Select a month to view La Grande sunrise and sunset times for the next 12 months.

JanFebMarAprMayJunJulAugSepOctNovDec

Date Sunrise times Sunset times
Monday, 1st September 2025 05:14 18:29
Monday, 15th September 2025 05:31 18:02
Tuesday, 30th September 2025 05:50 17:34

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