Grimsby Weather Forecast

    • 70
    • 96

    Chance Rain Showers

    • 65
    • 88

    Mostly Sunny

    • 68
    • 90

    Partly Sunny

    • 69
    • 87

    Rain Showers Likely

    • 67
    • 84

    Chance Thunderstorms

    • 67
    • 86

    Chance Rain Showers

Today 28 Jul Jackson

Mostly sunny. Hot with Highs in the mid 90s. Northwest Winds 5 to 10 Mph, becoming north in the afternoon. Highest heat index Readings heat index Readings up to 106 in the afternoon.

Tonight 28 Jul Jackson

Mostly cloudy in the Evening, then becoming partly cloudy. Lows in the upper 60s. Northeast Winds 5 to 10 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Grimsby Temperature Statistics

July Temperature

Southern Illinois Airport (11.2 miles)

  • Lowest 23 July, 2026

    62.6 °F

  • Average July

    80 °F

  • Highest 2 July, 2026

    95.6 °F

Climate (2021–2026)

Southern Illinois Airport (11.2 miles)

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

  • Average Low 2021–2026

    48.2 °F

  • Average 2021–2026

    58.7 °F

  • Average High 2021–2026

    69.3 °F
Get WillyWeather+ to remove ads