Guaynabo Weather Forecast

    • 78
    • 90

    Rain Showers

    • 78
    • 91

    Rain Showers

    • 78
    • 92

    Rain Showers

    • 78
    • 92

    Rain Showers

    • 79
    • 92

    Rain Showers

    • 79
    • 92

    Rain Showers

    • 79
    • 92

    Rain Showers

Today 31 Aug San Juan and Vicinity

Cloudy with isolated Thunderstorms. Showers. Highs around 91. Southeast Winds 10 to 15 Mph. Chance of rain 90 percent.

Tonight 31 Aug San Juan and Vicinity

Isolated Thunderstorms this evening. Variably cloudy with scattered Showers. Lows around 82. Southeast Winds 5 to 10 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Guaynabo Temperature Statistics

August Temperature

San Juan Fernando Luis Ribas Dominicci (6.8 miles)

  • Lowest 23 August, 2026

    73.4 °F

  • Average August

    86.2 °F

  • Highest 13 August, 2026

    89.6 °F

Climate (2021–2026)

San Juan Fernando Luis Ribas Dominicci (6.8 miles)

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  • Average Low 2021–2026

    77.7 °F

  • Average 2021–2026

    82.6 °F

  • Average High 2021–2026

    85.4 °F
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