Weather in Plum Valley, IL
Plum Valley, Sunday, 9 August, 05:15
Clear. Feels like 63°. High 85°, low 63°.
Monthly outlook for Plum Valley, IL: average high 84.7°, average low 66.9°. That is 2.7° above the climate normal for August. Precipitation is expected on 8 days (about 1.8 inches), against a normal of 6 days and 1.9 inches. The warmest day looks like 22 August (96.1°), the coolest 14 August (59.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81.3° | 80° | +0.7° |
| 19 August – 28 August | 90.4° | 80.1° | +5.8° |
| 29 August – 7 September | at normal | 78.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Calumet Park (15 mi).
0.19
Plum Valley, Monday, 10 August
Rain. High 90°, low 71°.
0.47Plum Valley, Tuesday, 11 August
Rain. High 82°, low 69°.
0.02Plum Valley, Wednesday, 12 August
Light rain. High 84°, low 70°.
0.01Plum Valley, Thursday, 13 August
Light rain. High 75°, low 64°.
0.05Plum Valley, Friday, 14 August
Light rain. High 75°, low 59°.
0.04Plum Valley, Saturday, 15 August
Light rain. High 78°, low 61°.
0.05Plum Valley, Sunday, 16 August
Light rain. High 80°, low 62°.
0.03Plum Valley, Monday, 17 August
Light rain. High 83°, low 65°.
0
Plum Valley, Tuesday, 18 August
Partly cloudy. High 81°, low 64°.
0.06Plum Valley, Wednesday, 19 August
Light rain. High 87°, low 67°.
0
Plum Valley, Thursday, 20 August
Overcast. High 93°, low 74°.
0
Plum Valley, Friday, 21 August
Mostly clear. High 86°, low 73°.
0
Plum Valley, Saturday, 22 August
Clear. High 96°, low 70°.
0Plum Valley, Sunday, 23 August
Overcast. High 96°, low 71°.
0.81Plum Valley, Monday, 24 August
Heavy rain. High 83°, low 69°.
0.07Plum Valley, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17
Plum Valley, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14Plum Valley, Thursday, 27 August
Climate normal for this date — 60-year average.
0.15Plum Valley, Friday, 28 August
Climate normal for this date — 60-year average.
0.1Plum Valley, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Plum Valley, Sunday, 30 August
Climate normal for this date — 60-year average.
0.06Plum Valley, Monday, 31 August
Climate normal for this date — 60-year average.
0.13Plum Valley, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Plum Valley, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.07Plum Valley, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Plum Valley, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Plum Valley, Saturday, 5 September
Climate normal for this date — 60-year average.
0.1Plum Valley, Sunday, 6 September
Climate normal for this date — 60-year average.
0.13Plum Valley, 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 Plum Valley, 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 Plum Valley, 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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