NWS, American, European side by side around Joliet 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
Joliet, IL is at its warmest in Jul (average highs near 83°F) and coldest in Jan (lows around 22°F), with roughly 42 in of precipitation across the year. Below, compare what NWS, American, European forecast for Joliet right now, and see exactly where they disagree.
Joliet climate by month
average daytime high and overnight low across a typical year
Jan
34°
22°
Feb
45°
27°
Mar
50°
32°
Apr
61°
40°
May
73°
52°
Jun
82°
61°
Jul
83°
64°
Aug
82°
64°
Sep
77°
59°
Oct
66°
48°
Nov
51°
36°
Dec
41°
29°
Common questions
What's the weather in Joliet today?
On this page we show what NWS, American, European each forecast for Joliet 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 Joliet today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Joliet 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 Joliet?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Joliet 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 Joliet?
Jul is typically the warmest month in Joliet, with average highs around 83°F.
How cold does Joliet get?
The coldest month in Joliet is Jan, when overnight lows average about 22°F.
How much rain does Joliet get?
Joliet sees roughly 42 in of precipitation a year, with Jul 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.