Weather in Signal Hill, IL
Signal Hill, Sunday, 9 August, 06:02
Mostly clear. Feels like 73°. High 96°, low 72°.
Monthly outlook for Signal Hill, IL: average high 97.3°, average low 73.1°. That is 6.1° above the climate normal for August. Precipitation is expected on 6 days (about 0.7 inches), against a normal of 5 days and 1.6 inches. The warmest day looks like 20 August (114.6°), the coolest 15 August (65.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 91.6° | 86.3° | +2.9° |
| 19 August – 28 August | 106.7° | 86.5° | +11.3° |
| 29 August – 7 September | at normal | 84.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — St. Louis (11 mi).
0.07
Signal Hill, Monday, 10 August
Rain. High 99°, low 71°.
0.02Signal Hill, Tuesday, 11 August
Light rain. High 101°, low 71°.
0.04Signal Hill, Wednesday, 12 August
Light rain. High 98°, low 76°.
0.25Signal Hill, Thursday, 13 August
Light rain. High 87°, low 71°.
0.15Signal Hill, Friday, 14 August
Light rain. High 77°, low 66°.
0.09Signal Hill, Saturday, 15 August
Light rain. High 89°, low 65°.
0
Signal Hill, Sunday, 16 August
Overcast. High 90°, low 70°.
0.06Signal Hill, Monday, 17 August
Light rain. High 87°, low 71°.
0.03Signal Hill, Tuesday, 18 August
Light rain. High 92°, low 68°.
0
Signal Hill, Wednesday, 19 August
Partly cloudy. High 104°, low 77°.
0
Signal Hill, Thursday, 20 August
Clear. High 115°, low 80°.
0Signal Hill, Friday, 21 August
Clear. High 104°, low 80°.
0
Signal Hill, Saturday, 22 August
Mostly clear. High 110°, low 79°.
0.01Signal Hill, Sunday, 23 August
Light rain. High 109°, low 78°.
0.02Signal Hill, Monday, 24 August
Light rain. High 98°, low 75°.
0.06Signal Hill, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.13Signal Hill, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.12Signal Hill, Thursday, 27 August
Climate normal for this date — 60-year average.
0.08Signal Hill, Friday, 28 August
Climate normal for this date — 60-year average.
0.07Signal Hill, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Signal Hill, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Signal Hill, Monday, 31 August
Climate normal for this date — 60-year average.
0.11
Signal Hill, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.12Signal Hill, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.1Signal Hill, Thursday, 3 September
Climate normal for this date — 60-year average.
0.13Signal Hill, Friday, 4 September
Climate normal for this date — 60-year average.
0.05Signal Hill, Saturday, 5 September
Climate normal for this date — 60-year average.
0.05Signal Hill, Sunday, 6 September
Climate normal for this date — 60-year average.
0.1Signal Hill, 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 Signal Hill, 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 Signal Hill, 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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