Weather in Glendale Heights, IL
Glendale Heights, Sunday, 9 August, 03:20
Clear. Feels like 64°. High 83°, low 63°.
Monthly outlook for Glendale Heights, IL: average high 83°, average low 67.9°. That is 1.8° above the climate normal for August. Precipitation is expected on 4 days (about 1.9 inches), against a normal of 6 days and 1.8 inches. The warmest day looks like 23 August (93.2°), the coolest 14 August (61.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 80.4° | 79.9° | +0.3° |
| 19 August – 28 August | 87.3° | 79.9° | +4.1° |
| 29 August – 7 September | at normal | 78.1° | — |
August records over 66 years
0.8
Glendale Heights, Monday, 10 August
Rain. High 89°, low 70°.
0.07Glendale Heights, Tuesday, 11 August
Light rain. High 80°, low 69°.
0.03Glendale Heights, Wednesday, 12 August
Light rain. High 85°, low 70°.
0
Glendale Heights, Thursday, 13 August
Overcast. High 76°, low 67°.
0Glendale Heights, Friday, 14 August
Overcast. High 75°, low 61°.
0Glendale Heights, Saturday, 15 August
Overcast. High 79°, low 63°.
0.01Glendale Heights, Sunday, 16 August
Light rain. High 76°, low 66°.
0.02Glendale Heights, Monday, 17 August
Light rain. High 82°, low 65°.
0Glendale Heights, Tuesday, 18 August
Overcast. High 79°, low 66°.
0.11Glendale Heights, Wednesday, 19 August
Light rain. High 85°, low 68°.
0Glendale Heights, Thursday, 20 August
Overcast. High 84°, low 75°.
0
Glendale Heights, Friday, 21 August
Clear. High 86°, low 74°.
0Glendale Heights, Saturday, 22 August
Clear. High 91°, low 70°.
0.02Glendale Heights, Sunday, 23 August
Light rain. High 93°, low 71°.
0.02Glendale Heights, Monday, 24 August
Light rain. High 84°, low 70°.
0.07
Glendale Heights, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15Glendale Heights, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11Glendale Heights, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13
Glendale Heights, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Glendale Heights, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Glendale Heights, Sunday, 30 August
Climate normal for this date — 60-year average.
0.08
Glendale Heights, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Glendale Heights, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.04Glendale Heights, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Glendale Heights, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Glendale Heights, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Glendale Heights, Saturday, 5 September
Climate normal for this date — 60-year average.
0.11Glendale Heights, Sunday, 6 September
Climate normal for this date — 60-year average.
0.09Glendale Heights, Monday, 7 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Glendale Heights, IL are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Glendale Heights, IL since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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