Weather in Pontoon Beach, IL
Pontoon Beach, Saturday, 8 August, 21:52
Clear. Feels like 80°. High 90°, low 70°.
Monthly outlook for Pontoon Beach, IL: average high 86.2°, average low 68.6°. That is 0.4° above the climate normal for August. Precipitation is expected on 9 days (about 2.1 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 11 August (102.3°), the coolest 21 August (57.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 87.3° | 85.4° | +1° |
| 18 August – 27 August | 84.3° | 85.7° | -0.7° |
| 28 August – 6 September | at normal | 83.6° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Edwardsville (6 mi).
0
Pontoon Beach, Sunday, 9 August
Overcast. High 96°, low 73°.
0
Pontoon Beach, Monday, 10 August
Light rain. High 99°, low 76°.
0.07Pontoon Beach, Tuesday, 11 August
Light rain. High 102°, low 74°.
0.11Pontoon Beach, Wednesday, 12 August
Light rain. High 87°, low 72°.
0.88Pontoon Beach, Thursday, 13 August
Rain. High 81°, low 69°.
0.53Pontoon Beach, Friday, 14 August
Rain. High 75°, low 69°.
0.18Pontoon Beach, Saturday, 15 August
Light rain. High 79°, low 68°.
0.06Pontoon Beach, Sunday, 16 August
Light rain. High 81°, low 66°.
0.06Pontoon Beach, Monday, 17 August
Light rain. High 82°, low 69°.
0.01Pontoon Beach, Tuesday, 18 August
Light rain. High 82°, low 69°.
0Pontoon Beach, Wednesday, 19 August
Overcast. High 87°, low 70°.
0
Pontoon Beach, Thursday, 20 August
Mostly clear. High 76°, low 59°.
0.04Pontoon Beach, Friday, 21 August
Light rain. High 76°, low 57°.
0.17Pontoon Beach, Saturday, 22 August
Light rain. High 91°, low 63°.
0.01Pontoon Beach, Sunday, 23 August
Light rain. High 94°, low 71°.
0.1
Pontoon Beach, Monday, 24 August
Climate normal for this date — 60-year average.
0.06Pontoon Beach, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.11Pontoon Beach, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.14Pontoon Beach, Thursday, 27 August
Climate normal for this date — 60-year average.
0.09Pontoon Beach, Friday, 28 August
Climate normal for this date — 60-year average.
0.07Pontoon Beach, Saturday, 29 August
Climate normal for this date — 60-year average.
0.12Pontoon Beach, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Pontoon Beach, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Pontoon Beach, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.1
Pontoon Beach, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Pontoon Beach, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Pontoon Beach, Friday, 4 September
Climate normal for this date — 60-year average.
0.04Pontoon Beach, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Pontoon Beach, Sunday, 6 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 Pontoon Beach, 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 Pontoon Beach, 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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