Weather in Port Byron, IL
Port Byron, Saturday, 8 August, 22:01
Clear. Feels like 71°. High 83°, low 67°.
Monthly outlook for Port Byron, IL: average high 79.7°, average low 62.8°. That is 0.7° below the climate normal for August. Precipitation is expected on 6 days (about 0.5 inches), against a normal of 5 days and 1.9 inches. The warmest day looks like 11 August (90.2°), the coolest 21 August (52.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 80.7° | 80.9° | -0.1° |
| 18 August – 27 August | 78° | 81° | -1.7° |
| 28 August – 6 September | at normal | 79.5° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Princeton (4 mi).
0
Port Byron, Sunday, 9 August
Partly cloudy. High 90°, low 64°.
0
Port Byron, Monday, 10 August
Light rain. High 89°, low 72°.
0
Port Byron, Tuesday, 11 August
Overcast. High 90°, low 73°.
0.01Port Byron, Wednesday, 12 August
Light rain. High 82°, low 69°.
0.07Port Byron, Thursday, 13 August
Light rain. High 73°, low 62°.
0Port Byron, Friday, 14 August
Partly cloudy. High 77°, low 60°.
0.04Port Byron, Saturday, 15 August
Light rain. High 65°, low 60°.
0Port Byron, Sunday, 16 August
Overcast. High 76°, low 59°.
0.05Port Byron, Monday, 17 August
Light rain. High 83°, low 65°.
0Port Byron, Tuesday, 18 August
Overcast. High 86°, low 65°.
0.16Port Byron, Wednesday, 19 August
Rain. High 76°, low 61°.
0.1Port Byron, Thursday, 20 August
Light rain. High 71°, low 53°.
0Port Byron, Friday, 21 August
Overcast. High 73°, low 52°.
0.01Port Byron, Saturday, 22 August
Light rain. High 78°, low 57°.
0
Port Byron, Sunday, 23 August
Clear. High 83°, low 66°.
0.09Port Byron, Monday, 24 August
Climate normal for this date — 60-year average.
0.12Port Byron, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.19Port Byron, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.12Port Byron, Thursday, 27 August
Climate normal for this date — 60-year average.
0.17
Port Byron, Friday, 28 August
Climate normal for this date — 60-year average.
0.09Port Byron, Saturday, 29 August
Climate normal for this date — 60-year average.
0.07Port Byron, Sunday, 30 August
Climate normal for this date — 60-year average.
0.09Port Byron, Monday, 31 August
Climate normal for this date — 60-year average.
0.1Port Byron, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.06Port Byron, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.13Port Byron, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Port Byron, Friday, 4 September
Climate normal for this date — 60-year average.
0.07Port Byron, Saturday, 5 September
Climate normal for this date — 60-year average.
0.12Port Byron, 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 Port Byron, 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 Port Byron, 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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