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Every US forecast, compared
CheckWeather US›Boulder

Boulder weather

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NWSNational Blend (NBM)
79°
Mainly clear
Feels 83° · Wind 2 mph · Humidity 56%
AmericanNOAA GFS
72°
Light drizzle
Feels 73° · Wind 7 mph · Humidity 67%
EuropeanECMWF
72°
Heavy drizzle
Feels 77° · Wind 2 mph · Humidity 81%

Latest for Boulder: NWS (National Blend (NBM)): 79° Mainly clear · American (NOAA GFS): 72° Light drizzle · European (ECMWF): 72° Heavy drizzle.

The weather map: all three models at once

NWS, American, European side by side around Boulder 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

Boulder, CO is at its warmest in Jul (average highs near 86°F) and coldest in Jan (lows around 15°F), with roughly 20 in of precipitation across the year. Below, compare what NWS, American, European forecast for Boulder right now, and see exactly where they disagree.

Boulder climate by month

average daytime high and overnight low across a typical year
Jan
33°
15°
Feb
41°
15°
Mar
46°
22°
Apr
58°
32°
May
67°
43°
Jun
78°
54°
Jul
86°
57°
Aug
84°
58°
Sep
79°
51°
Oct
66°
41°
Nov
48°
26°
Dec
45°
26°

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 Boulder today?
On this page we show what NWS, American, European each forecast for Boulder 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 Boulder today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Boulder 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 Boulder?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Boulder 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 Boulder?
Jul is typically the warmest month in Boulder, with average highs around 86°F.
How cold does Boulder get?
The coldest month in Boulder is Jan, when overnight lows average about 15°F.
How much rain does Boulder get?
Boulder sees roughly 20 in of precipitation a year, with May 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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More US weather

Most accurate forecastUS rain radarAll US citiesHoliday weather abroadThe European model vs the American model: ECMWF vs GFSThe national forecast models, explained: NBM, UKMO, GEM and ACCESS