Weather in Willamette in September

General weather information about Willamette

Average annual temperature is 12.4 °C

Absolute maximum temperature: 41.3 °C

Absolute minimum temperature: -6.6 °C

Number of sunny days: 167 days

Number of rainy days: 197 days

Number of snow days: 1 day

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* Weather data for Willamette United States is based on climate observations for 2026 year

Willamette air temperature forecast for each month

JanFebMarAprMayJunJulAugSepOctNovDec
Absolute maximum temperature (°C)13.513.417.927.831.532.636.141.333.228.417.016.1
Average daytime temperature (°C)9.18.610.814.023.425.930.931.724.418.612.010.7
Average temperature (°C)5.53.85.38.715.917.621.923.117.413.08.07.6
Average night temperature (°C)2.80.71.85.010.111.114.516.312.49.55.25.3
Absolute minimum temperature (°C)-4.4-6.6-2.5-0.26.46.911.311.47.82.0-2.20.1

Willamette monthly weather indicators

JanFebMarAprMayJunJulAugSepOctNovDec
Daylight maximum duration (h)9.011.012.014.015.015.015.014.013.011.010.08.0
Daylight mean duration (h)9.210.411.913.514.915.615.314.112.511.09.58.8
Daylight minimum duration (h)8.09.011.012.014.015.014.013.011.010.09.08.0
Sunshine mean duration (h)3.65.16.26.610.812.713.611.68.86.65.43.0
Precipitation (mm)123120171216473421971125155290
Sunny days7935202426231614137
Rainy days241828251165814171724
Snow days010000000000

Willamette - weather forecast by months

Willamette weather in januaryWillamette weather in februaryWillamette weather in marchWillamette weather in aprilWillamette weather in mayWillamette weather in juneWillamette weather in julyWillamette weather in augustWillamette weather in septemberWillamette weather in octoberWillamette weather in novemberWillamette weather in december

Best time to visit Willamette:

The best time to visit Willamette during the most sunny months:

  • May — 10.8(h)
  • June — 12.7(h)
  • July — 13.6(h)
  • August — 11.6(h)

Months with the longest average daylight duration in Willamette:

  • June — 15.6(h)
  • July — 15.3(h)

The largest precipitation sum in Willamette is at

  • March — 171(mm)
  • April — 216(mm)
  • November — 155(mm)
  • December — 290(mm)

    • Weather forecast in the closest to Willamette admin centers

    Weather forecast in the closest towns to Willamette

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    Frequently asked questions

    When is the best time to visit Willamette?
    The historical weather data above shows the warmest, sunniest and driest months to help you choose the best time to visit Willamette.
    What is the weather like in Willamette?
    See average temperature, rainfall and daylight hours for Willamette by month in the table above.
    How many sunny days does Willamette have?
    The monthly weather statistics above show sunshine and rainfall patterns for Willamette throughout the year.