San Mateo Reservoir Weather Forecast

    • 51
    • 69

    Rain Showers

    • 49
    • 60

    Rain Showers

    • 49
    • 66

    Thunderstorms

    • 49
    • 67

    Thunderstorms

    • 51
    • 71

    Partly Sunny

    • 51
    • 71

    Mostly Cloudy

    • 47
    • 67

    Chance Thunderstorms

Today 22 Sep West Central Mountains

Mostly cloudy with Showers likely with a chance of Thunderstorms. Some Thunderstorms may produce heavy rainfall. Highs in the upper 60s. South Winds 15 to 20 Mph. Chance of rain 70 percent.

Tonight 22 Sep West Central Mountains

Numerous Showers and scattered Thunderstorms in the Evening, then Showers with isolated Thunderstorms after midnight. Some Thunderstorms may produce heavy rainfall in the evening. Some Thunderstorms may produce heavy rainfall after midnight. Lows around 50. Southeast Winds around 15 Mph. Chance of rain near 100 percent.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

San Mateo Reservoir Temperature Statistics

September Temperature

Grants, Grants-Milan Municipal Airport (18.6 miles)

  • Lowest 11 September, 2026

    43 °F

  • Average September

    67.1 °F

  • Highest 6 September, 2026

    89.6 °F

Climate (2021–2026)

Grants, Grants-Milan Municipal Airport (18.6 miles)

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

  • Average Low 2021–2026

    35 °F

  • Average 2021–2026

    53 °F

  • Average High 2021–2026

    68.2 °F
Get WillyWeather+ to remove ads