Weather in Swansea, IL
Swansea, Sunday, 9 August, 07:19
Mostly clear. Feels like 73°. High 96°, low 72°.
Monthly outlook for Swansea, IL: average high 96.9°, average low 72.8°. That is 5.9° above the climate normal for August. Precipitation is expected on 6 days (about 0.7 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 20 August (114.4°), the coolest 15 August (65.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 91.3° | 86.3° | +2.8° |
| 19 August – 28 August | 106.4° | 86.5° | +11.1° |
| 29 August – 7 September | at normal | 84.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — St. Louis (15 mi).
0.04
Swansea, Monday, 10 August
Light rain. High 99°, low 71°.
0.01Swansea, Tuesday, 11 August
Light rain. High 100°, low 72°.
0.04Swansea, Wednesday, 12 August
Light rain. High 98°, low 75°.
0.25Swansea, Thursday, 13 August
Light rain. High 86°, low 71°.
0.16Swansea, Friday, 14 August
Light rain. High 77°, low 66°.
0.09Swansea, Saturday, 15 August
Light rain. High 88°, low 65°.
0
Swansea, Sunday, 16 August
Overcast. High 90°, low 70°.
0.06Swansea, Monday, 17 August
Light rain. High 86°, low 71°.
0.02Swansea, Tuesday, 18 August
Light rain. High 92°, low 68°.
0Swansea, Wednesday, 19 August
Mostly clear. High 103°, low 76°.
0
Swansea, Thursday, 20 August
Clear. High 114°, low 80°.
0Swansea, Friday, 21 August
Clear. High 104°, low 79°.
0Swansea, Saturday, 22 August
Mostly clear. High 109°, low 79°.
0.01Swansea, Sunday, 23 August
Light rain. High 109°, low 77°.
0.02Swansea, Monday, 24 August
Light rain. High 98°, low 74°.
0.06
Swansea, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.13Swansea, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.12Swansea, Thursday, 27 August
Climate normal for this date — 60-year average.
0.08Swansea, Friday, 28 August
Climate normal for this date — 60-year average.
0.07Swansea, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Swansea, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Swansea, Monday, 31 August
Climate normal for this date — 60-year average.
0.11
Swansea, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.12Swansea, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.1Swansea, Thursday, 3 September
Climate normal for this date — 60-year average.
0.13Swansea, Friday, 4 September
Climate normal for this date — 60-year average.
0.05Swansea, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Swansea, Sunday, 6 September
Climate normal for this date — 60-year average.
0.1Swansea, 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 Swansea, 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 Swansea, 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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