South Boston weather
Loading live data…Latest for South Boston: NWS (National Blend (NBM)): 66° Clear · American (NOAA GFS): 62° Clear · European (ECMWF): 65° Clear.
The weather map: all three models at once
NWS, American, European side by side around South Boston and nearby towns.Live rain radar →Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitSouth Boston, MA is at its warmest in Jul (average highs near 83°F) and coldest in Feb (lows around 26°F), with roughly 51 in of precipitation across the year. Below, compare what NWS, American, European forecast for South Boston right now, and see exactly where they disagree.
South Boston climate by month
average daytime high and overnight low across a typical yearWhich forecast is most accurate in South Boston?
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 South Boston today?
Will it rain in South Boston today or tomorrow?
Which forecast is most accurate for South Boston?
What is the warmest month in South Boston?
How cold does South Boston get?
How much rain does South Boston get?
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.