Santa Rosa Lake Weather Forecast

    • 76
    • 101

    Hot

    • 77
    • 99

    Chance Rain Showers

    • 76
    • 97

    Chance Thunderstorms

    • 74
    • 96

    Chance Thunderstorms

    • 75
    • 97

    Hot

    • 75
    • 99

    Hot

    • 75
    • 98

    Chance Thunderstorms

Today 15 Sep Inland Willacy

Sunny. A chance of Showers and Thunderstorms in the afternoon. Highs in the upper 90s. Chance of rain 40 percent. Heat index Values up to 110.

Tonight 15 Sep Inland Willacy

Mostly clear. Lows in the mid 70s. Southeast Winds 15 to 20 Mph with Gusts up to 30 Mph, Diminishing to around 5 Mph after midnight.

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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

    90.1 °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

    76.1 °F

  • Average High 2021–2026

    86.9 °F
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