Brentwood Weather Forecast

    • 60
    • 69

    Rain Showers

    • 45
    • 70

    Mostly Sunny

    • 50
    • 68

    Mostly Sunny

    • 58
    • 79

    Partly Sunny

    • 57
    • 73

    Mostly Cloudy

    • 54
    • 75

    Chance Rain Showers

Today 13 Sep Interior Rockingham

Patchy fog this morning. Showers with a slight chance of Thunderstorms. Highs in the upper 60s. Light and variable Winds. Chance of rain near 100 percent.

Tonight 13 Sep Interior Rockingham

Mostly cloudy in the Evening, then partly cloudy with a chance of Showers after midnight. Humid with Lows around 60. Light and variable Winds, becoming west around 10 Mph after midnight. Chance of rain 40 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Brentwood Temperature Statistics

September Temperature

Pease Air Force Base / Portsmouth (14.3 miles)

  • Lowest 7 September, 2026

    54.5 °F

  • Average September

    67.2 °F

  • Highest 10 September, 2026

    86.5 °F

Climate (2021–2026)

Pease Air Force Base / Portsmouth (14.3 miles)

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  • Average Low 2021–2026

    42.3 °F

  • Average 2021–2026

    50.7 °F

  • Average High 2021–2026

    59.2 °F
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