Portsmouth weather averages

Going to Portsmouth? Find the best month to visit Portsmouth based on the weather.

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Check Portsmouth weather averages before you book your next holiday in 2019/2020. Today's maximum temperature in Portsmouth is expected to be 12°C, while the average maximum temperature in April is 13°C.

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The weather for Portsmouth, New Hampshire shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by MeteoBlue. Find out more about our data sources.

Metric (°C / mm)  |  Imperial (°F / inches)

Portsmouth weather averages: best month

Portsmouth Best month Averages
Warmest July 28°C
Sunniest June, July & August 9 hours per day
Least rain September 8 days
Warmest sea August 18°C

Portsmouth climate guide

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Tropical storm risk: Portsmouth, New Hampshire hurricane season

% of month affected by tropical storms
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The Portsmouth, New Hampshire tropical storm risk chart above shows the hurricane season. The chart was processed from data supplied by the US Meteorological Agency (NOAA). Find out more about our data sources.

More about tropical storms

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Portsmouth weather averages by month

Check Portsmouth holiday weather averages for a particular month by selecting from the list below. Monthly weather guides include figures for temperature, rainfall, sunshine hours and sea temperature plus daily sunrise & sunset times.

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Compare Portsmouth weather with the USA

Below the Portsmouth weather chart shows maximum daytime temperature for Portsmouth, New Hampshire, USA and the USA (Washington). For more weather parameters or to change the destinations shown visit the comparison weather tool.

Maximum daytime temperature (°C)

Portsmouth, New Hampshire, USA
USA (Washington)
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Metric (°C / mm)  |  Imperial (°F / inches)

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