Lieutenant Island Weather Forecast

    • 69
    • 74

    Rain Showers Likely

    • 67
    • 75

    Mostly Sunny

    • 65
    • 74

    Mostly Sunny

    • 67
    • 78

    Mostly Sunny

    • 68
    • 79

    Chance Rain Showers

    • 68
    • 79

    Slight Chance Rain Showers

Today 23 Aug Barnstable

Mostly cloudy. A chance of Showers with possible Thunderstorms and drizzle in the Morning, then a slight chance of Showers with isolated Thunderstorms in the afternoon. Patchy fog. Humid with Highs in the upper 70s. South Winds 5 to 10 Mph. Gusts up to 20 Mph in the afternoon. Chance of rain 50 percent.

Tonight 23 Aug Barnstable

Cloudy with a chance of Showers, Thunderstorms with patchy drizzle. Patchy fog. Near steady temperature in the mid 60s. East Winds around 5 Mph. Chance of rain 50 percent.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Lieutenant Island Temperature Statistics

August Temperature

Chatham, Chatham Municipal Airport (14.3 miles)

  • Lowest 16 August, 2026

    59 °F

  • Average August

    73.7 °F

  • Highest 11 August, 2026

    84.9 °F

Climate (2021–2026)

Chatham, Chatham Municipal Airport (14.3 miles)

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  • Average Low 2021–2026

    47.4 °F

  • Average 2021–2026

    53.7 °F

  • Average High 2021–2026

    59.8 °F
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