Weather in St. Clair, MO
St. Clair, Thursday, 8 October, 06:12
Clear. Feels like 50°. High 85°, low 51°.
Monthly outlook for St. Clair, MO: average high 83°, average low 60.1°. That is 8.6° above the climate normal for October. Precipitation is expected on 1 day (about 1.0 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 15 October (94.9°), the coolest 8 October (50.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 October – 17 October | 85.1° | 68.6° | +9.1° |
| 18 October – 27 October | 79.4° | 64.3° | +8.4° |
| 28 October – 6 November | at normal | 60° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Sullivan (13 mi).
0
St. Clair, Friday, 9 October
Clear. High 89°, low 54°.
0
St. Clair, Saturday, 10 October
Overcast. High 86°, low 62°.
0St. Clair, Sunday, 11 October
Clear. High 82°, low 62°.
0St. Clair, Monday, 12 October
Clear. High 94°, low 62°.
0
St. Clair, Tuesday, 13 October
Partly cloudy. High 88°, low 67°.
0St. Clair, Wednesday, 14 October
Clear. High 87°, low 57°.
0St. Clair, Thursday, 15 October
Clear. High 95°, low 73°.
0.93
St. Clair, Friday, 16 October
Rain. High 81°, low 61°.
0St. Clair, Saturday, 17 October
Overcast. High 63°, low 56°.
0St. Clair, Sunday, 18 October
Overcast. High 71°, low 56°.
0.01St. Clair, Monday, 19 October
Light rain. High 83°, low 59°.
0St. Clair, Tuesday, 20 October
Overcast. High 76°, low 61°.
0St. Clair, Wednesday, 21 October
Clear. High 75°, low 53°.
0.01St. Clair, Thursday, 22 October
Light rain. High 85°, low 57°.
0.01St. Clair, Friday, 23 October
Light rain. High 87°, low 70°.
0.1St. 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.
0.13
St. 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.
0.09St. Clair, Friday, 6 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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