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CheckWeather US›Decatur

Decatur weather

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NWSNational Blend (NBM)
75°
Mainly clear
Feels 78° · Wind 5 mph · Humidity 46%
AmericanNOAA GFS
77°
Clear
Feels 79° · Wind 4 mph · Humidity 39%
EuropeanECMWF
74°
Clear
Feels 78° · Wind 5 mph · Humidity 51%

Latest for Decatur: NWS (National Blend (NBM)): 75° Mainly clear · American (NOAA GFS): 77° Clear · European (ECMWF): 74° Clear.

The weather map: all three models at once

NWS, American, European side by side around Decatur 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

Decatur, IL is at its warmest in Jun (average highs near 84°F) and coldest in Jan (lows around 25°F), with roughly 37 in of precipitation across the year. Below, compare what NWS, American, European forecast for Decatur right now, and see exactly where they disagree.

Decatur climate by month

average daytime high and overnight low across a typical year
Jan
38°
25°
Feb
50°
30°
Mar
54°
35°
Apr
65°
45°
May
76°
56°
Jun
84°
65°
Jul
84°
67°
Aug
83°
66°
Sep
78°
61°
Oct
67°
50°
Nov
54°
39°
Dec
44°
31°

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 Decatur today?
On this page we show what NWS, American, European each forecast for Decatur 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 Decatur today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Decatur 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 Decatur?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Decatur 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 Decatur?
Jun is typically the warmest month in Decatur, with average highs around 84°F.
How cold does Decatur get?
The coldest month in Decatur is Jan, when overnight lows average about 25°F.
How much rain does Decatur get?
Decatur sees roughly 37 in of precipitation a year, with Apr 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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