Weather in Sun Valley Lake, IA
Sun Valley Lake, Sunday, 9 August, 02:33
Heavy rain. Feels like 75°. High 93°, low 74°.
Monthly outlook for Sun Valley Lake, IA: average high 88.1°, average low 69.4°. That is 3.1° above the climate normal for August. Precipitation is expected on 6 days (about 2.1 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 22 August (109°), the coolest 15 August (61.2°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 82.7° | 82.5° | +0.1° |
| 19 August – 28 August | 96.9° | 82.5° | +8° |
| 29 August – 7 September | at normal | 80.4° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Kellerton (10 mi).
0.01Sun Valley Lake, Monday, 10 August
Light rain. High 84°, low 72°.
0.04Sun Valley Lake, Tuesday, 11 August
Light rain. High 97°, low 74°.
0.02Sun Valley Lake, Wednesday, 12 August
Light rain. High 86°, low 68°.
0.5Sun Valley Lake, Thursday, 13 August
Rain. High 77°, low 64°.
0.28Sun Valley Lake, Friday, 14 August
Rain. High 66°, low 62°.
0.17Sun Valley Lake, Saturday, 15 August
Light rain. High 73°, low 61°.
0
Sun Valley Lake, Sunday, 16 August
Partly cloudy. High 81°, low 65°.
0
Sun Valley Lake, Monday, 17 August
Overcast. High 79°, low 67°.
0Sun Valley Lake, Tuesday, 18 August
Overcast. High 91°, low 66°.
0Sun Valley Lake, Wednesday, 19 August
Partly cloudy. High 108°, low 74°.
0Sun Valley Lake, Thursday, 20 August
Partly cloudy. High 95°, low 77°.
0Sun Valley Lake, Friday, 21 August
Overcast. High 85°, low 70°.
0
Sun Valley Lake, Saturday, 22 August
Clear. High 109°, low 73°.
0.72Sun Valley Lake, Sunday, 23 August
Heavy rain. High 94°, low 75°.
0.29Sun Valley Lake, Monday, 24 August
Rain. High 90°, low 69°.
0.19Sun Valley Lake, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.18
Sun Valley Lake, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13Sun Valley Lake, Thursday, 27 August
Climate normal for this date — 60-year average.
0.14Sun Valley Lake, Friday, 28 August
Climate normal for this date — 60-year average.
0.06Sun Valley Lake, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Sun Valley Lake, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Sun Valley Lake, Monday, 31 August
Climate normal for this date — 60-year average.
0.09Sun Valley Lake, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09Sun Valley Lake, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11Sun Valley Lake, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Sun Valley Lake, Friday, 4 September
Climate normal for this date — 60-year average.
0.09Sun Valley Lake, Saturday, 5 September
Climate normal for this date — 60-year average.
0.08Sun Valley Lake, Sunday, 6 September
Climate normal for this date — 60-year average.
0.17Sun Valley Lake, 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 Sun Valley Lake, IA 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 Sun Valley Lake, IA 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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