Weather in Chain of Rocks, MO
Chain of Rocks, Sunday, 9 August, 12:22
Partly cloudy. Feels like 101°. High 94°, low 72°.
Monthly outlook for Chain of Rocks, MO: average high 96.5°, average low 69.6°. That is 6.2° above the climate normal for August. Precipitation is expected on 3 days (about 0.4 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 15 August (103.8°), the coolest 24 August (61.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 97.9° | 85.5° | +6.9° |
| 19 August – 28 August | 94.3° | 85.6° | +4.8° |
| 29 August – 7 September | at normal | 83.3° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — O'Fallon (10 mi).
0.01
Chain of Rocks, Monday, 10 August
Light rain. High 102°, low 76°.
0
Chain of Rocks, Tuesday, 11 August
Overcast. High 103°, low 76°.
0.07Chain of Rocks, Wednesday, 12 August
Rain. High 100°, low 74°.
0.14Chain of Rocks, Thursday, 13 August
Rain. High 97°, low 73°.
0Chain of Rocks, Friday, 14 August
Overcast. High 92°, low 71°.
0
Chain of Rocks, Saturday, 15 August
Mostly clear. High 104°, low 71°.
0Chain of Rocks, Sunday, 16 August
Overcast. High 96°, low 75°.
0Chain of Rocks, Monday, 17 August
Overcast. High 87°, low 63°.
0.16Chain of Rocks, Tuesday, 18 August
Rain. High 104°, low 68°.
0Chain of Rocks, Wednesday, 19 August
Mostly clear. High 97°, low 71°.
0
Chain of Rocks, Thursday, 20 August
Clear. High 90°, low 63°.
0.01Chain of Rocks, Friday, 21 August
Light rain. High 100°, low 66°.
0Chain of Rocks, Saturday, 22 August
Clear. High 101°, low 72°.
0Chain of Rocks, Sunday, 23 August
Clear. High 89°, low 62°.
0Chain of Rocks, Monday, 24 August
Clear. High 89°, low 61°.
0.06Chain of Rocks, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.15Chain of Rocks, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.08Chain of Rocks, Thursday, 27 August
Climate normal for this date — 60-year average.
0.08Chain of Rocks, Friday, 28 August
Climate normal for this date — 60-year average.
0.07Chain of Rocks, Saturday, 29 August
Climate normal for this date — 60-year average.
0.13Chain of Rocks, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Chain of Rocks, Monday, 31 August
Climate normal for this date — 60-year average.
0.11Chain of Rocks, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.13
Chain of Rocks, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.07Chain of Rocks, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Chain of Rocks, Friday, 4 September
Climate normal for this date — 60-year average.
0.04Chain of Rocks, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Chain of Rocks, Sunday, 6 September
Climate normal for this date — 60-year average.
0.07Chain of Rocks, 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 Chain of Rocks, 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 Chain of Rocks, 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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