CheckWeather US›Merrimack
Merrimack weather
Loading live data…The weather map: all three models at once
NWS, American, European side by side around Merrimack and nearby towns.Live rain radar →Loading the three model maps…
Next 14 hours
consensus of the three models7-day forecast
where the models agree, and where they splitMerrimack, NH is at its warmest in Jul (average highs near 84°F) and coldest in Feb (lows around 22°F), with roughly 52 in of precipitation across the year. Below, compare what NWS, American, European forecast for Merrimack right now, and see exactly where they disagree.
Merrimack climate by month
average daytime high and overnight low across a typical yearJan
38°
24°
Feb
41°
22°
Mar
47°
29°
Apr
58°
38°
May
70°
48°
Jun
78°
57°
Jul
84°
66°
Aug
78°
61°
Sep
74°
56°
Oct
64°
46°
Nov
50°
33°
Dec
41°
27°
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?
On this page we show what NWS, American, European each forecast for Merrimack today, side by side and updated live. When all three agree the forecast is reliable; when they split, we flag it so you know the day is genuinely less certain.
Will it rain in Merrimack today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Merrimack and flag the days where the models disagree on whether showers actually arrive, which is exactly when a single app can catch you out.
Which forecast is most accurate for Merrimack?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Merrimack forecast is reliable, and when they split you should expect surprises. See our tested US accuracy scoreboard for how the models compare.
What is the warmest month in Merrimack?
Jul is typically the warmest month in Merrimack, with average highs around 84°F.
How cold does Merrimack get?
The coldest month in Merrimack is Feb, when overnight lows average about 22°F.
How much rain does Merrimack get?
Merrimack sees roughly 52 in of precipitation a year, with Mar usually the wettest month.
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.