Weather in Mount Vernon, IL
Mount Vernon, Sunday, 9 August, 08:35
Clear. Feels like 77°. High 92°, low 72°.
0Mount Vernon, Monday, 10 August
Clear. High 96°, low 75°.
0
Mount Vernon, Tuesday, 11 August
Light rain. High 96°, low 74°.
0.01Mount Vernon, Wednesday, 12 August
Light rain. High 88°, low 75°.
0.24Mount Vernon, Thursday, 13 August
Rain. High 91°, low 71°.
0.01Mount Vernon, Friday, 14 August
Light rain. High 88°, low 72°.
0.09Mount Vernon, Saturday, 15 August
Light rain. High 91°, low 71°.
0Mount Vernon, Sunday, 16 August
Clear. High 94°, low 75°.
0.06Mount Vernon, Monday, 17 August
Light rain. High 81°, low 65°.
0.08Mount Vernon, Tuesday, 18 August
Light rain. High 94°, low 66°.
0
Mount Vernon, Wednesday, 19 August
Partly cloudy. High 90°, low 71°.
0
Mount Vernon, Thursday, 20 August
Mostly clear. High 81°, low 63°.
0Mount Vernon, Friday, 21 August
Clear. High 93°, low 63°.
0Mount Vernon, Saturday, 22 August
Clear. High 92°, low 75°.
0Mount Vernon, Sunday, 23 August
Clear. High 81°, low 62°.
0Mount Vernon, Monday, 24 August
Partly cloudy. High 82°, low 59°.
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 Mount Vernon, 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 Mount Vernon, 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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