Climate & Weather in Portsmouth
Portsmouth has a real, genuine four-season New England coastal climate, with cold, snowy winters (January average high cited around 19-34°F depending on source) and mild, coastal-moderated summers (July average high cited around 76-80°F) -- genuinely milder summers than many inland New Hampshire and Massachusetts locations, given Portsmouth's Atlantic-coastal setting.
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Learn moreWarm-to-Mild, Coastal-Moderated Summers
July, Portsmouth's warmest month, is cited with an average high around 76.3°F -- genuinely milder than many inland New England locations, consistent with the moderating effect of Portsmouth's Atlantic-coastal setting.
Cold, Snowy Winters
January, the coldest month, is cited with an average low around 19-21°F, with the overall annual temperature range running from approximately 19°F to 80°F across the year and rarely below 5°F or above 89°F. Annual snowfall is cited at approximately 59 inches, with snow typically beginning around November and ending by April.
Annual Precipitation and Four Distinct Seasons
Portsmouth receives approximately 49 inches of annual precipitation, and experiences four genuinely distinct New England seasons -- a real, defining climate characteristic for movers considering the Seacoast region versus a milder or more uniform climate elsewhere. Average annual temperature was cited at approximately 47.1°F.
Key takeaways
- Portsmouth's July average high runs around 76.3°F, genuinely milder than many inland New England locations given its coastal setting.
- Portsmouth's January average low runs around 19-21°F, with approximately 59 inches of annual snowfall.
- Annual precipitation runs approximately 49 inches, with four genuinely distinct seasons and an average annual temperature around 47.1°F.
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