Weather in Preston Heights, IL
Preston Heights, Sunday, 9 August, 03:07
Clear. Feels like 65°. High 87°, low 64°.
Monthly outlook for Preston Heights, IL: average high 83.6°, average low 66.7°. That is 1.5° above the climate normal for August. Precipitation is expected on 10 days (about 1.2 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 22 August (92.4°), the coolest 14 August (58.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 80.8° | 80.9° | -0° |
| 19 August – 28 August | 88.2° | 80.9° | +4° |
| 29 August – 7 September | at normal | 79.3° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Joliet (4 mi).
0.05
Preston Heights, Monday, 10 August
Light rain. High 91°, low 72°.
0.19Preston Heights, Tuesday, 11 August
Rain. High 83°, low 70°.
0.04Preston Heights, Wednesday, 12 August
Light rain. High 83°, low 69°.
0.15Preston Heights, Thursday, 13 August
Rain. High 76°, low 61°.
0.11Preston Heights, Friday, 14 August
Light rain. High 75°, low 58°.
0.07Preston Heights, Saturday, 15 August
Light rain. High 76°, low 60°.
0.04Preston Heights, Sunday, 16 August
Light rain. High 78°, low 62°.
0.01Preston Heights, Monday, 17 August
Light rain. High 81°, low 65°.
0
Preston Heights, Tuesday, 18 August
Partly cloudy. High 79°, low 64°.
0.08Preston Heights, Wednesday, 19 August
Light rain. High 85°, low 67°.
0
Preston Heights, Thursday, 20 August
Overcast. High 90°, low 73°.
0
Preston Heights, Friday, 21 August
Mostly clear. High 86°, low 72°.
0
Preston Heights, Saturday, 22 August
Clear. High 92°, low 69°.
0Preston Heights, Sunday, 23 August
Overcast. High 91°, low 71°.
0.32Preston Heights, Monday, 24 August
Rain. High 85°, low 69°.
0.11Preston Heights, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17
Preston Heights, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.12Preston Heights, Thursday, 27 August
Climate normal for this date — 60-year average.
0.11Preston Heights, Friday, 28 August
Climate normal for this date — 60-year average.
0.12Preston Heights, Saturday, 29 August
Climate normal for this date — 60-year average.
0.07Preston Heights, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Preston Heights, Monday, 31 August
Climate normal for this date — 60-year average.
0.11Preston Heights, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Preston Heights, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.08Preston Heights, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Preston Heights, Friday, 4 September
Climate normal for this date — 60-year average.
0.06Preston Heights, Saturday, 5 September
Climate normal for this date — 60-year average.
0.12Preston Heights, Sunday, 6 September
Climate normal for this date — 60-year average.
0.13Preston 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 Preston 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 Preston 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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