Santa Rosa Lake Weather Forecast

    • 77
    • 100

    Slight Chance Thunderstorms

    • 76
    • 99

    Slight Chance Thunderstorms

    • 77
    • 101

    Chance Thunderstorms

    • 78
    • 102

    Hot

    • 79
    • 101

    Hot

    • 78
    • 100

    Hot

    • 78
    • 100

    Slight Chance Thunderstorms

Today 8 Sep Inland Willacy

Sunny with a slight chance of Showers and Thunderstorms. Hot. Near steady temperature in the upper 90s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of rain 20 percent. Heat index Values up to 113.

Tonight 8 Sep Inland Willacy

Mostly clear. Humid with Lows in the upper 70s. Southeast Winds 10 to 15 Mph with Gusts up to 25 Mph, Diminishing to around 5 Mph after midnight. Heat index Values up to 107 early in the evening.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Santa Rosa Lake Temperature Statistics

September Temperature

Harlingen, Rio Grande Valley International Airport (9.3 miles)

  • Lowest 1 September, 2026

    74.6 °F

  • Average September

    89.7 °F

  • Highest 2 September, 2026

    104.6 °F

Climate (2021–2026)

Harlingen, Rio Grande Valley International Airport (9.3 miles)

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  • Average Low 2021–2026

    65.8 °F

  • Average 2021–2026

    76 °F

  • Average High 2021–2026

    86.9 °F
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