Weather in Saint Thomas, IL
Saint Thomas, Saturday, 8 August, 19:07
Clear. Feels like 99°. High 90°, low 71°.
Monthly outlook for Saint Thomas, IL: average high 87.9°, average low 70.6°. That is 1.2° above the climate normal for August. Precipitation is expected on 5 days (about 2.5 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 11 August (102.6°), the coolest 15 August (58.5°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 89.9° | 85.8° | +2.2° |
| 18 August – 27 August | 84.7° | 86° | -0.7° |
| 28 August – 6 September | at normal | 83.9° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Flordell Hills (9 mi).
0
Saint Thomas, Sunday, 9 August
Overcast. High 96°, low 74°.
0Saint Thomas, Monday, 10 August
Clear. High 101°, low 77°.
0.02
Saint Thomas, Tuesday, 11 August
Light rain. High 103°, low 79°.
0.04Saint Thomas, Wednesday, 12 August
Light rain. High 90°, low 79°.
0.47Saint Thomas, Thursday, 13 August
Rain. High 85°, low 71°.
0.02Saint Thomas, Friday, 14 August
Light rain. High 78°, low 64°.
0Saint Thomas, Saturday, 15 August
Overcast. High 79°, low 59°.
0.07Saint Thomas, Sunday, 16 August
Light rain. High 80°, low 63°.
0.27Saint Thomas, Monday, 17 August
Rain. High 96°, low 72°.
0Saint Thomas, Tuesday, 18 August
Overcast. High 88°, low 75°.
0Saint Thomas, Wednesday, 19 August
Overcast. High 95°, low 73°.
1.52Saint Thomas, Thursday, 20 August
Heavy rain. High 86°, low 74°.
0.05Saint Thomas, Friday, 21 August
Light rain. High 82°, low 70°.
0Saint Thomas, Saturday, 22 August
Overcast. High 85°, low 67°.
0.03Saint Thomas, Sunday, 23 August
Light rain. High 72°, low 62°.
0.09
Saint Thomas, Monday, 24 August
Climate normal for this date — 60-year average.
0.07Saint Thomas, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.14
Saint Thomas, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13Saint Thomas, Thursday, 27 August
Climate normal for this date — 60-year average.
0.08Saint Thomas, Friday, 28 August
Climate normal for this date — 60-year average.
0.07Saint Thomas, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Saint Thomas, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Saint Thomas, Monday, 31 August
Climate normal for this date — 60-year average.
0.11Saint Thomas, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.12Saint Thomas, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Saint Thomas, Thursday, 3 September
Climate normal for this date — 60-year average.
0.12Saint Thomas, Friday, 4 September
Climate normal for this date — 60-year average.
0.04
Saint Thomas, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Saint Thomas, 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 Saint Thomas, 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 Saint Thomas, 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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