Weather in Rochester, IL
Rochester, Saturday, 8 August, 21:43
Clear. Feels like 79°. High 88°, low 70°.
Monthly outlook for Rochester, IL: average high 82.7°, average low 65.5°. That is 0.3° below the climate normal for August. Precipitation is expected on 8 days (about 3.9 inches), against a normal of 5 days and 1.7 inches. The warmest day looks like 11 August (96.2°), the coolest 21 August (53.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 84.3° | 83.2° | +0.6° |
| 18 August – 27 August | 80.1° | 83.5° | -1.9° |
| 28 August – 6 September | at normal | 81.9° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Springfield (6 mi).
0
Rochester, Sunday, 9 August
Clear. High 93°, low 71°.
0
Rochester, Monday, 10 August
Partly cloudy. High 95°, low 75°.
0.14
Rochester, Tuesday, 11 August
Rain. High 96°, low 72°.
0.32Rochester, Wednesday, 12 August
Rain. High 84°, low 73°.
3Rochester, Thursday, 13 August
Heavy rain. High 83°, low 64°.
0.05Rochester, Friday, 14 August
Light rain. High 77°, low 65°.
0.12Rochester, Saturday, 15 August
Light rain. High 73°, low 63°.
0.11Rochester, Sunday, 16 August
Light rain. High 76°, low 64°.
0.08Rochester, Monday, 17 August
Light rain. High 79°, low 64°.
0
Rochester, Tuesday, 18 August
Overcast. High 83°, low 66°.
0Rochester, Wednesday, 19 August
Overcast. High 84°, low 63°.
0Rochester, Thursday, 20 August
Overcast. High 74°, low 55°.
0Rochester, Friday, 21 August
Overcast. High 72°, low 53°.
0.11Rochester, Saturday, 22 August
Light rain. High 79°, low 61°.
0
Rochester, Sunday, 23 August
Mostly clear. High 89°, low 67°.
0.11Rochester, Monday, 24 August
Climate normal for this date — 60-year average.
0.08Rochester, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.11Rochester, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.09Rochester, Thursday, 27 August
Climate normal for this date — 60-year average.
0.11Rochester, Friday, 28 August
Climate normal for this date — 60-year average.
0.08Rochester, Saturday, 29 August
Climate normal for this date — 60-year average.
0.06Rochester, Sunday, 30 August
Climate normal for this date — 60-year average.
0.09
Rochester, Monday, 31 August
Climate normal for this date — 60-year average.
0.17Rochester, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.11Rochester, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.09Rochester, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Rochester, Friday, 4 September
Climate normal for this date — 60-year average.
0.04Rochester, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Rochester, Sunday, 6 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 Rochester, 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 Rochester, 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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