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Glendale Heights weather

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NWSNational Blend (NBM)
51°
Mainly clear
Feels 48° · Wind 5 mph · Humidity 84%
AmericanNOAA GFS
49°
Clear
Feels 45° · Wind 5 mph · Humidity 77%
EuropeanECMWF
51°
Overcast
Feels 48° · Wind 5 mph · Humidity 80%

Latest for Glendale Heights: NWS (National Blend (NBM)): 51° Mainly clear · American (NOAA GFS): 49° Clear · European (ECMWF): 51° Overcast.

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Glendale Heights weather alerts and warnings

active National Weather Service watches, warnings and advisories

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Glendale Heights weather in numbers

measured normals and 10 years of recorded weather

Glendale Heights swings 64°F across the year, from 82°F highs in July to 18°F lows in January, and August is usually the wettest month in a year that brings about 39 in of precipitation. Over 10 years of recorded weather it averages 95 days a year at 77°F or above, 27 of them at 86°F or above, 115 frost nights, and rain on 132 days.

Warmest month
July
82°F average high
Coldest month
January
18°F average low
Wettest month
August
39 in a year
Comfortable
3 months
May, September and October
Residents
34,000
share this forecast
Most accurate here
European
97/100 CheckWeather Score
Warm days
95 days
a year at 77°F or above
Frost nights
115 nights
a year below 32°F
Rain days
132 days
a year with 0.04 in or more

Day counts are from the ERA5 reanalysis for Glendale Heights’s grid square, 2016 to 2025, counted the same way for every city so the numbers compare. A reanalysis square is an area, not a weather station, so it is good for counting days and not for a single day’s record.

The weather map: all three models at once

NWS, American, European side by side around Glendale Heights and nearby towns.Live rain radar →
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Glendale Heights hourly forecast: next 14 hours

consensus of the three models

Rain in the next 24 hours, model by model

each model's own hourly precipitation, side by side

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Glendale Heights 10-day forecast, out to 14 days

where the models agree, and where they split

Glendale Heights, Illinois (IL) is at its warmest in Jul (average highs near 82°F) and coldest in Jan (lows around 18°F), with roughly 39 in of precipitation across the year. Below, compare what NWS, American, European forecast for Glendale Heights right now, and see exactly where they disagree.

We grade every model against the weather that actually happened, so you can see which forecast model is most accurate in United States before you trust any single number.

Glendale Heights climate by month

average daytime high and overnight low across a typical year (1991-2020)
Jan
29°
18°
Feb
37°
19°
Mar
46°
29°
Apr
58°
38°
May
68°
47°
Jun
79°
58°
Jul
82°
64°
Aug
81°
63°
Sep
74°
56°
Oct
60°
44°
Nov
46°
32°
Dec
35°
23°

Source: 1991-2020 averages, ERA5 for this place adjusted with NASA POWER.

How the weather around Glendale Heights has changed since 1995

Glendale Heights sits in the same roughly 50 km square of NASA's reanalysis as Aurora. That square shows no clear change in temperature between 1995-2004 and 2015-2024. See the full 30-year picture on the Aurora page.

Which forecast is most accurate in Glendale Heights?

CheckWeather Score, graded against the weather that actually happened
ProviderCheckWeather-scoreTempWindRainRun by
European logo
European ★ Best
97
/100rank #1
97±0.3°F98±0.8 mph9597% hitECMWF - European Centre for Medium-Range Weather ForecastsReading, United Kingdom
American logo
American
79
/100rank #2
81±1.9°F95±1.4 mph6581% 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 1999 cities. Lower error means a higher score. See which forecast model is most accurate in United States, how we measure forecast accuracy, or which model each weather app uses.

What do you think of the forecasts?

your vote counts

The accuracy above is the measured record. This is your opinion: which forecast service do you trust most in United States? Give each 1 to 5 stars.

NWSNational Blend (NBM)
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AmericanNOAA GFS
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EuropeanECMWF
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One vote per service. Anonymous: we store no personal data, only a one-way hash of your connection for a day to stop double votes.

Common questions

What's the weather in Glendale Heights today?
On this page we show what NWS, American, European each forecast for Glendale 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 Glendale Heights today or tomorrow?
Check the hourly strip and 7-day forecast above. We compare rain from NWS, American, European for Glendale 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 Glendale Heights?
Over the last 30 days, the European model has been the most accurate for Glendale Heights (CheckWeather Score 97/100), ahead of the American at 79. We grade every model against the recorded weather. See the US accuracy scoreboard for the full method.
What is the warmest month in Glendale Heights?
July is typically the warmest month in Glendale Heights, with average highs around 82°F.
How cold does Glendale Heights get?
The coldest month in Glendale Heights is January, when overnight lows average about 18°F.
How much rain does Glendale Heights get?
Glendale Heights sees roughly 39 in of precipitation a year, with August usually the wettest month.

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