Merrimack weather
Loading live data…Latest for Merrimack: NWS (National Blend (NBM)): 68° Clear · American (NOAA GFS): 69° Clear · European (ECMWF): 69° Clear.
The weather map: all three models at once
NWS, American, European side by side around Merrimack and nearby towns.Live rain radar →Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitMerrimack is a small town of about 27,000 people in NH, sitting at 42.9°N in a temperate climate zone. NWS, American, European each forecast Merrimack with their own physics, so we line all three up and flag where they disagree. Nearby towns include Litchfield, Bedford, Londonderry.
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 Merrimack today?
Will it rain in Merrimack today or tomorrow?
Which forecast is most accurate for Merrimack?
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.