Portland Weather Forecast

    • 60
    • 65

    Rain Showers

    • 50
    • 71

    Mostly Sunny

    • 52
    • 61

    Chance Rain Showers

    • 51
    • 60

    Chance Rain Showers

    • 51
    • 61

    Slight Chance Rain Showers

    • 50
    • 60

    Slight Chance Rain Showers

Today 17 Sep Coastal Cumberland

Partly sunny in the Morning, then mostly cloudy with a slight chance of Showers in the afternoon. Highs in the lower 70s. Light and variable Winds. Chance of rain 20 percent.

Tonight 17 Sep Coastal Cumberland

Showers, mainly in the evening. Lows in the upper 50s. Light and variable Winds. Chance of rain 90 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Portland Temperature Statistics

September Temperature

Portland, Portland International Jetport (2.5 miles)

  • Lowest 12 September, 2026

    43.6 °F

  • Average September

    65.1 °F

  • Highest 10 September, 2026

    85.6 °F

Climate (2021–2026)

Portland, Portland International Jetport (2.5 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2021–2026

    40 °F

  • Average 2021–2026

    48.7 °F

  • Average High 2021–2026

    57.3 °F
Get WillyWeather+ to remove ads