Ayer Weather Forecast

    • 57
    • 82

    Slight Chance Rain Showers

    • 44
    • 78

    Mostly Sunny

    • 41
    • 70

    Mostly Sunny

    • 48
    • 73

    Partly Sunny

    • 55
    • 77

    Mostly Sunny

    • 59
    • 83

    Partly Sunny

Today 18 Sep Northwest Middlesex County

Partly sunny. A slight chance of Showers in the morning. Patchy fog in the morning. Highs in the lower 80s. Light and variable Winds, becoming southwest around 5 Mph in the afternoon. Chance of rain 20 percent.

Tonight 18 Sep Northwest Middlesex County

Mostly cloudy with a 40 percent chance of Showers. Not as cool. Near steady temperature in the mid 50s. Light and variable Winds.

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Ayer Temperature Statistics

September Temperature

Fitchburg, Fitchburg Municipal Airport (8.1 miles)

  • Lowest 11 September, 2025

    44.1 °F

  • Average September

    64 °F

  • Highest 6 September, 2025

    84 °F

Climate (2020–Present)

Fitchburg, Fitchburg Municipal Airport (8.1 miles)

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  • Average Low 2020–2025

    41.8 °F

  • Average 2020–2025

    51.9 °F

  • Average High 2020–2025

    61.8 °F
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