Weather in Plymouth, IL
Plymouth, Sunday, 9 August, 03:19
Overcast. Feels like 70°. High 93°, low 69°.
Monthly outlook for Plymouth, IL: average high 91.4°, average low 71°. That is 4.4° above the climate normal for August. Precipitation is expected on 4 days (about 0.8 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 20 August (110.8°), the coolest 15 August (62.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 85.7° | 83.6° | +1.2° |
| 19 August – 28 August | 100.8° | 83.5° | +9.6° |
| 29 August – 7 September | at normal | 81.5° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Camden (12 mi).
0Plymouth, Monday, 10 August
Overcast. High 94°, low 75°.
0.02
Plymouth, Tuesday, 11 August
Light rain. High 97°, low 70°.
0.09Plymouth, Wednesday, 12 August
Light rain. High 87°, low 72°.
0.02Plymouth, Thursday, 13 August
Light rain. High 85°, low 68°.
0.32Plymouth, Friday, 14 August
Light rain. High 66°, low 63°.
0.21Plymouth, Saturday, 15 August
Light rain. High 82°, low 62°.
0.01Plymouth, Sunday, 16 August
Light rain. High 82°, low 68°.
0Plymouth, Monday, 17 August
Overcast. High 83°, low 67°.
0.01Plymouth, Tuesday, 18 August
Light rain. High 89°, low 67°.
0
Plymouth, Wednesday, 19 August
Mostly clear. High 105°, low 75°.
0
Plymouth, Thursday, 20 August
Partly cloudy. High 111°, low 79°.
0Plymouth, Friday, 21 August
Partly cloudy. High 94°, low 77°.
0.02Plymouth, Saturday, 22 August
Light rain. High 106°, low 75°.
0.02Plymouth, Sunday, 23 August
Light rain. High 101°, low 76°.
0.09Plymouth, Monday, 24 August
Light rain. High 88°, low 72°.
0.12Plymouth, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15Plymouth, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.05Plymouth, Thursday, 27 August
Climate normal for this date — 60-year average.
0.13
Plymouth, Friday, 28 August
Climate normal for this date — 60-year average.
0.08Plymouth, Saturday, 29 August
Climate normal for this date — 60-year average.
0.09Plymouth, Sunday, 30 August
Climate normal for this date — 60-year average.
0.1Plymouth, Monday, 31 August
Climate normal for this date — 60-year average.
0.15Plymouth, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09Plymouth, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Plymouth, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Plymouth, Friday, 4 September
Climate normal for this date — 60-year average.
0.04Plymouth, Saturday, 5 September
Climate normal for this date — 60-year average.
0.08Plymouth, Sunday, 6 September
Climate normal for this date — 60-year average.
0.1Plymouth, 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 Plymouth, 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 Plymouth, 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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