Weather in St. Clair, MO
St. Clair, Wednesday, 7 October, 21:32
Clear. Feels like 68°. High 88°, low 55°.
Monthly outlook for St. Clair, MO: average high 78.5°, average low 53.9°. That is 6° above the climate normal for October. Precipitation is expected on 2 days (about 0.2 inches), against a normal of 4 days and 1.6 inches. The warmest day looks like 15 October (96°), the coolest 18 October (37.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 7 October – 16 October | 85.8° | 69° | +9.4° |
| 17 October – 26 October | 66.3° | 64.7° | +0.9° |
| 27 October – 5 November | at normal | 60.5° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sullivan (13 mi).
0
St. Clair, Thursday, 8 October
Mostly clear. High 84°, low 51°.
0
St. Clair, Friday, 9 October
Clear. High 89°, low 53°.
0.02
St. Clair, Saturday, 10 October
Light rain. High 86°, low 62°.
0.05St. Clair, Sunday, 11 October
Light rain. High 77°, low 63°.
0St. Clair, Monday, 12 October
Clear. High 92°, low 60°.
0St. Clair, Tuesday, 13 October
Light rain. High 77°, low 61°.
0.02St. Clair, Wednesday, 14 October
Light rain. High 85°, low 55°.
0St. Clair, Thursday, 15 October
Clear. High 96°, low 73°.
0.12St. Clair, Friday, 16 October
Light rain. High 84°, low 59°.
0
St. Clair, Saturday, 17 October
Overcast. High 60°, low 47°.
0St. Clair, Sunday, 18 October
Clear. High 63°, low 38°.
0St. Clair, Monday, 19 October
Clear. High 70°, low 41°.
0St. Clair, Tuesday, 20 October
Mostly clear. High 75°, low 47°.
0St. Clair, Wednesday, 21 October
Overcast. High 65°, low 45°.
0St. Clair, Thursday, 22 October
Overcast. High 64°, low 52°.
0.11
St. Clair, Friday, 23 October
Climate normal for this date — 60-year average.
0.1
St. Clair, Saturday, 24 October
Climate normal for this date — 60-year average.
0.13St. Clair, Sunday, 25 October
Climate normal for this date — 60-year average.
0.13St. Clair, Monday, 26 October
Climate normal for this date — 60-year average.
0.11St. Clair, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06St. Clair, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.13St. Clair, Thursday, 29 October
Climate normal for this date — 60-year average.
0.13St. Clair, Friday, 30 October
Climate normal for this date — 60-year average.
0.15St. Clair, Saturday, 31 October
Climate normal for this date — 60-year average.
0.17St. Clair, Sunday, 1 November
Climate normal for this date — 60-year average.
0.1St. Clair, Monday, 2 November
Climate normal for this date — 60-year average.
0.13St. Clair, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.16St. Clair, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.17St. Clair, Thursday, 5 November
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 St. Clair, MO 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 St. Clair, MO 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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