Martinsburg Weather Forecast

    • 64
    • 91

    Slight Chance Thunderstorms

    • 63
    • 87

    Slight Chance Thunderstorms

    • 62
    • 90

    Chance Thunderstorms

    • 63
    • 87

    Chance Thunderstorms

    • 59
    • 78

    Chance Rain Showers

    • 59
    • 77

    Slight Chance Rain Showers

    • 60
    • 79

    Slight Chance Rain Showers

Today 15 Sep Keokuk

Partly sunny with a chance of Showers and Thunderstorms. Hot. Near steady temperature around 90. Southeast Winds around 5 Mph. Chance of rain 30 percent.

Tonight 15 Sep Keokuk

Mostly cloudy. A chance of Showers and Thunderstorms Early, then a chance of Showers with a slight chance of Thunderstorms this evening. Humid with Lows in the lower 60s. East Winds around 5 Mph. Chance of rain 30 percent.

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  • Temperature Real-Time

Martinsburg Temperature Statistics

September Temperature

Ottumwa Regional Airport (11.2 miles)

  • Lowest 7 September, 2025

    41 °F

  • Average September

    65.2 °F

  • Highest 13 September, 2025

    96.1 °F

Climate (2020–Present)

Ottumwa Regional Airport (11.2 miles)

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  • Average Low 2020–2025

    41.8 °F

  • Average 2020–2025

    52.1 °F

  • Average High 2020–2025

    62.6 °F
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