| National Weather Service Forecast for:
Portsmouth NH Issued by: National Weather Service Gray/Portland, ME |
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| Updated: 2:26 am EDT Jun 30, 2026 | ||||||||||||||||||
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| Today |
Mostly sunny, with a high near 86. Light southwest wind becoming south 5 to 10 mph in the afternoon. |
| Tonight |
A chance of showers and thunderstorms. Mostly cloudy, with a low around 68. Southwest wind around 5 mph. Chance of precipitation is 40%. New rainfall amounts of less than a tenth of an inch, except higher amounts possible in thunderstorms. |
| Wednesday |
Mostly sunny and hot, with a high near 97. Heat index values as high as 107. Southwest wind around 5 mph. |
| Wednesday Night |
Partly cloudy, with a low around 75. Southwest wind around 5 mph. |
| Thursday |
Sunny and hot, with a high near 101. West wind around 5 mph. |
| Thursday Night |
Mostly clear, with a low around 76. |
| Friday |
Sunny and hot, with a high near 102. |
| Friday Night |
Mostly clear, with a low around 72. |
| Independence Day |
A 30 percent chance of showers and thunderstorms after 2pm. Mostly sunny and hot, with a high near 90. |
| Saturday Night |
A chance of showers and thunderstorms before 8pm, then a chance of showers between 8pm and 9pm. Partly cloudy, with a low around 68. Chance of precipitation is 30%. |
| Sunday |
Mostly sunny, with a high near 89. |
| Sunday Night |
Partly cloudy, with a low around 65. |
| Monday |
Partly sunny, with a high near 82. |
Forecast from NOAA-NWS for Portsmouth NH.
