Portsmouth weather
Loading live data…Latest for Portsmouth: NWS (National Blend (NBM)): 78° Clear · American (NOAA GFS): 76° Clear · European (ECMWF): 76° Mainly clear.
The weather map: all three models at once
NWS, American, European side by side around Portsmouth and nearby towns.Live rain radar →Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitPortsmouth is a small town of about 18,000 people in RI, sitting at 41.6°N in a temperate climate zone. NWS, American, European each forecast Portsmouth with their own physics, so we line all three up and flag where they disagree. Nearby towns include Tiverton, Middletown, Bristol.
Which forecast is most accurate in the US?
CheckWeather Score — graded against the weather that actually happened
The CheckWeather Score blends temperature, wind and rain accuracy — each measured against ERA5 (the recorded weather) over the last 30 days across 40 cities. Lower error means a higher score. The apps you know (AccuWeather, Apple Weather, The Weather Channel) are built on these models.
Common questions
What's the weather in Portsmouth today?
Will it rain in Portsmouth today or tomorrow?
Which forecast is most accurate for Portsmouth?
The forecasts Americans check
The two biggest apps keep their model a secret, so we can't show their numbers, only link you to them. The National Weather Service is public, so its data sits right in the comparison above.