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Every US forecast, compared
CheckWeather US›Longmont

Longmont weather

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NWSNational Blend (NBM)
81°
Partly cloudy
Feels 85° · Wind 3 mph · Humidity 52%
AmericanNOAA GFS
78°
Overcast
Feels 80° · Wind 8 mph · Humidity 63%
EuropeanECMWF
79°
Light drizzle
Feels 81° · Wind 4 mph · Humidity 56%

Latest for Longmont: NWS (National Blend (NBM)): 81° Partly cloudy · American (NOAA GFS): 78° Overcast · European (ECMWF): 79° Light drizzle.

The weather map: all three models at once

NWS, American, European side by side around Longmont and nearby towns.Live rain radar →
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Next 14 hours

consensus of the three models

7-day forecast

where the models agree, and where they split

Longmont, CO is at its warmest in Jul (average highs near 86°F) and coldest in Jan (lows around 14°F), with roughly 21 in of precipitation across the year. Below, compare what NWS, American, European forecast for Longmont right now, and see exactly where they disagree.

Longmont climate by month

average daytime high and overnight low across a typical year
Jan
34°
14°
Feb
42°
15°
Mar
48°
23°
Apr
61°
33°
May
70°
43°
Jun
80°
54°
Jul
86°
56°
Aug
85°
57°
Sep
80°
49°
Oct
67°
40°
Nov
48°
25°
Dec
44°
24°

Which forecast is most accurate in the US?

CheckWeather Score — graded against the weather that actually happened
ProviderCheckWeather Score🌡 Temp💨 Wind🌧 RainRun by
European logo
European ★ Best
Behind Apple Weather, Windy
88
/100rank #1
85±1.5°F96±1.2 mph8592% hitECMWF — European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
Behind Windy & many free apps
74
/100rank #2
82±1.8°F92±2.6 mph5374% hitNOAA / NCEP (United States)College Park, Maryland, USA

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 Longmont today?
On this page we show what NWS, American, European each forecast for Longmont 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 Longmont today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Longmont 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 Longmont?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Longmont 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 Longmont?
Jul is typically the warmest month in Longmont, with average highs around 86°F.
How cold does Longmont get?
The coldest month in Longmont is Jan, when overnight lows average about 14°F.
How much rain does Longmont get?
Longmont sees roughly 21 in of precipitation a year, with Jun 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.

NWSNational Weather Service
Open model · shown above ✓AWAccuWeather
Closed model · open ↗↗TWCThe Weather Channel
Closed model · open ↗↗

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