Ottawa Weather Forecast

    • 69
    • 78

    Chance Thunderstorms

    • 55
    • 76

    Mostly Sunny

    • 54
    • 73

    Chance Thunderstorms

    • 63
    • 78

    Chance Rain Showers

    • 52
    • 73

    Chance Thunderstorms

    • 60
    • 72

    Chance Thunderstorms

    • 66
    • 81

    Slight Chance Thunderstorms

Today 22 Sep La Salle

Becoming partly cloudy. Showers and a chance of Thunderstorms in the evening. Some Thunderstorms may produce heavy rainfall in the evening. Lows in the mid 50s. Southwest Winds 10 to 20 Mph with Gusts up to 30 Mph in the evening shifting to the northwest after midnight. Chance of precipitation 100 percent.

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Ottawa Temperature Statistics

September Temperature

Illinois Valley Regional Airport (15.5 miles)

  • Lowest 5 September, 2019

    52 °F
  • Average September

    69.3 °F
  • Highest 12 September, 2019

    88.9 °F

Climate (2010–Present)

Illinois Valley Regional Airport (15.5 miles)

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  • Average Low 2010–Present

    43.4 °F
  • Average 2010–Present

    52.6 °F
  • Average High 2010–Present

    61.4 °F
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