Trimountain State Park Weather Forecast

    • 68
    • 83

    Increasing Clouds

    • 63
    • 88

    Chance Rain Showers

    • 57
    • 74

    Partly Sunny

    • 59
    • 75

    Chance Rain Showers

    • 58
    • 75

    Chance Rain Showers

    • 57
    • 76

    Mostly Sunny

Today 16 Aug Northern Middlesex

Partly sunny with a slight chance of Showers and Thunderstorms. Highs in the mid 80s. South Winds around 5 Mph. Chance of rain 20 percent.

Tonight 16 Aug Northern Middlesex

Partly cloudy in the Evening, then becoming mostly cloudy. Humid with Lows in the upper 60s. South Winds around 5 Mph.

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Trimountain State Park Temperature Statistics

August Temperature

Meriden, Meriden Markham Municipal Airport (6.2 miles)

  • Lowest 9 August, 2025

    51.7 °F

  • Average August

    73.1 °F

  • Highest 14 August, 2025

    93 °F

Climate (2020–Present)

Meriden, Meriden Markham Municipal Airport (6.2 miles)

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  • Average Low 2020–2025

    43.2 °F

  • Average 2020–2025

    53.2 °F

  • Average High 2020–2025

    63 °F
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