CheckWeather US›Waterloo
Waterloo weather
Loading live data…The weather map: all three models at once
NWS, American, European side by side around Waterloo 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 splitWaterloo, IA is at its warmest in Jun (average highs near 82°F) and coldest in Jan (lows around 16°F), with roughly 32 in of precipitation across the year. Below, compare what NWS, American, European forecast for Waterloo right now, and see exactly where they disagree.
Waterloo climate by month
average daytime high and overnight low across a typical yearJan
29°
16°
Feb
43°
22°
Mar
48°
29°
Apr
60°
40°
May
74°
52°
Jun
82°
63°
Jul
81°
64°
Aug
82°
64°
Sep
79°
59°
Oct
65°
48°
Nov
48°
34°
Dec
38°
26°
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 Waterloo today?
On this page we show what NWS, American, European each forecast for Waterloo 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 Waterloo today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Waterloo 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 Waterloo?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Waterloo 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 Waterloo?
Jun is typically the warmest month in Waterloo, with average highs around 82°F.
How cold does Waterloo get?
The coldest month in Waterloo is Jan, when overnight lows average about 16°F.
How much rain does Waterloo get?
Waterloo sees roughly 32 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.