Weather in Arlington Heights, IL
Arlington Heights, Sunday, 9 August, 09:03
Clear. Feels like 75°. High 86°, low 62°.
Monthly outlook for Arlington Heights, IL: average high 80.4°, average low 64.8°. That is 0.5° above the climate normal for August. Precipitation is expected on 8 days (about 3.4 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 10 August (90.1°), the coolest 23 August (59.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81.2° | 79.7° | +0.8° |
| 19 August – 28 August | 79.2° | 79.7° | -0.2° |
| 29 August – 7 September | at normal | 77.9° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Park Ridge (9 mi).
0.87
Arlington Heights, Monday, 10 August
Heavy rain. High 90°, low 72°.
1.19Arlington Heights, Tuesday, 11 August
Heavy rain. High 86°, low 66°.
0.01Arlington Heights, Wednesday, 12 August
Light rain. High 86°, low 65°.
0.08Arlington Heights, Thursday, 13 August
Light rain. High 75°, low 65°.
0
Arlington Heights, Friday, 14 August
Overcast. High 75°, low 63°.
0.06Arlington Heights, Saturday, 15 August
Light rain. High 78°, low 66°.
0.22Arlington Heights, Sunday, 16 August
Rain. High 77°, low 65°.
0Arlington Heights, Monday, 17 August
Overcast. High 79°, low 65°.
0Arlington Heights, Tuesday, 18 August
Overcast. High 81°, low 63°.
0.02Arlington Heights, Wednesday, 19 August
Light rain. High 76°, low 67°.
0.05Arlington Heights, Thursday, 20 August
Light rain. High 77°, low 63°.
0.14Arlington Heights, Friday, 21 August
Rain. High 80°, low 64°.
0.02Arlington Heights, Saturday, 22 August
Light rain. High 83°, low 66°.
0Arlington Heights, Sunday, 23 August
Clear. High 78°, low 60°.
0Arlington Heights, Monday, 24 August
Clear. High 81°, low 64°.
0.06
Arlington Heights, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15
Arlington Heights, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.11Arlington Heights, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13Arlington Heights, Friday, 28 August
Climate normal for this date — 60-year average.
0.11Arlington Heights, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Arlington Heights, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Arlington Heights, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Arlington Heights, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.05Arlington Heights, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Arlington Heights, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Arlington Heights, Friday, 4 September
Climate normal for this date — 60-year average.
0.08Arlington Heights, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Arlington Heights, Sunday, 6 September
Climate normal for this date — 60-year average.
0.07Arlington 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 Arlington 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 Arlington 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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