National Weather Service Forecast for:
Portsmouth NH Issued by: National Weather Service Gray/Portland, ME |
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Updated: 3:24 pm EDT Jul 27, 2025 | ||||||||||||||||||
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Hazardous Weather Outlook
Heat Advisory
This Afternoon |
A 50 percent chance of showers and thunderstorms, mainly before 5pm. Widespread haze. Mostly cloudy, with a high near 76. South wind around 10 mph. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
Tonight |
Widespread haze before 4am, then widespread haze after 5am. Partly cloudy, with a low around 66. South wind around 5 mph becoming calm in the evening. |
Monday |
Widespread haze before 7am, then widespread haze after 8am. Sunny, with a high near 88. Calm wind becoming southeast around 5 mph in the afternoon. |
Monday Night |
Mostly clear, with a low around 64. South wind around 5 mph becoming calm in the evening. |
Tuesday |
Sunny and hot, with a high near 92. Calm wind becoming southwest around 5 mph in the afternoon. |
Tuesday Night |
Partly cloudy, with a low around 67. |
Wednesday |
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny, with a high near 87. |
Wednesday Night |
A 40 percent chance of showers and thunderstorms. Mostly cloudy, with a low around 66. |
Thursday |
A 40 percent chance of showers and thunderstorms. Partly sunny, with a high near 78. |
Thursday Night |
A 30 percent chance of showers before 2am. Mostly cloudy, with a low around 59. |
Friday |
Mostly sunny, with a high near 76. |
Friday Night |
Mostly clear, with a low around 57. |
Saturday |
Sunny, with a high near 78. |
Saturday Night |
Mostly clear, with a low around 58. |
Sunday |
Sunny, with a high near 83. |
Forecast from NOAA-NWS for Portsmouth NH.