San Mateo Weather Forecast

    • 53
    • 75

    Slight Chance Thunderstorms

    • 37
    • 72

    Mostly Sunny

    • 44
    • 71

    Mostly Sunny

    • 46
    • 72

    Slight Chance Thunderstorms

    • 48
    • 70

    Chance Thunderstorms

    • 49
    • 67

    Chance Thunderstorms

Today 3 Oct West Central Mountains

Mostly sunny this Morning, then partly cloudy with a slight chance of Showers and Thunderstorms this afternoon. Highs in the mid 70s. South Winds 15 to 20 Mph. Chance of rain 20 percent.

Tonight 3 Oct West Central Mountains

Breezy. Partly cloudy with a slight chance of Sprinkles in the Evening, then mostly clear after midnight. Lows around 50. South Winds 15 to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

San Mateo Temperature Statistics

October Temperature

Grants, Grants-Milan Municipal Airport (18 miles)

  • Lowest 1 October, 2025

    42.3 °F

  • Average October

    61.4 °F

  • Highest 1 October, 2025

    77 °F

Climate (2020–Present)

Grants, Grants-Milan Municipal Airport (18 miles)

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  • Average Low 2020–2025

    34 °F

  • Average 2020–2025

    52.1 °F

  • Average High 2020–2025

    67.3 °F
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