Portsmouth weather
Loading live data…Light drizzle,cooler tomorrow
NWS, the American and the European model agree on a high near 88° in Portsmouth today. Tomorrow looks partly cloudy around 81°, with a 20% chance of rain.
Latest for Portsmouth: NWS (National Blend (NBM)): 82° Clear · American (NOAA GFS): 82° Clear · European (ECMWF): 80° Clear.
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active National Weather Service watches, warnings and advisoriesChecking the National Weather Service for active alerts covering Portsmouth…
Portsmouth weather in numbers
from 30 years of measured normalsPortsmouth swings 49°F across the year, from 87°F highs in July to 38°F lows in January, and June is usually the wettest month in a year that brings about 47 in of precipitation.
The weather map: all three models at once
NWS, American, European side by side around Portsmouth and nearby towns.Live rain radar →Portsmouth hourly forecast: next 14 hours
consensus of the three modelsRain in the next 24 hours, model by model
each model's own hourly precipitation, side by sideLoading the three models…
Portsmouth 10-day forecast, out to 14 days
where the models agree, and where they splitPortsmouth, Virginia (VA) is at its warmest in Jul (average highs near 87°F) and coldest in Jan (lows around 38°F), with roughly 47 in of precipitation across the year. Below, compare what NWS, American, European forecast for Portsmouth right now, and see exactly where they disagree.
We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.
Portsmouth climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in Portsmouth?
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 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.
What do you think of the forecasts?
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Where the models disagree
temperature and rain, judged separatelyThe models often agree on temperature and still split on rain, and rain is usually what decides whether a plan survives. A wide rain range means the shower is genuinely uncertain, not that the forecast is wrong.