NWS, American, European side by side around Arlington Heights 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
Arlington Heights, IL is at its warmest in Jul (average highs near 82°F) and coldest in Jan (lows around 21°F), with roughly 40 in of precipitation across the year. Below, compare what NWS, American, European forecast for Arlington Heights right now, and see exactly where they disagree.
Arlington Heights climate by month
average daytime high and overnight low across a typical year
Jan
33°
21°
Feb
44°
25°
Mar
48°
31°
Apr
59°
40°
May
71°
49°
Jun
81°
60°
Jul
82°
64°
Aug
81°
64°
Sep
77°
59°
Oct
64°
48°
Nov
49°
36°
Dec
39°
28°
Common questions
What's the weather in Arlington Heights today?
On this page we show what NWS, American, European each forecast for Arlington Heights 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 Arlington Heights today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Arlington Heights 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 Arlington Heights?
No single model is always right. NWS, American, European each run their own physics, so we line all three up: when they agree the Arlington Heights 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 Arlington Heights?
Jul is typically the warmest month in Arlington Heights, with average highs around 82°F.
How cold does Arlington Heights get?
The coldest month in Arlington Heights is Jan, when overnight lows average about 21°F.
How much rain does Arlington Heights get?
Arlington Heights sees roughly 40 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.