Weather in Grand River, IA
Grand River, Saturday, 8 August, 23:01
Overcast. Feels like 76°. High 83°, low 63°.
Monthly outlook for Grand River, IA: average high 81.3°, average low 65.6°. That is 0.7° below the climate normal for August. Precipitation is expected on 5 days (about 2.1 inches), against a normal of 5 days and 1.8 inches. The warmest day looks like 11 August (97.6°), the coolest 21 August (52.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 82.9° | 82.5° | +0.2° |
| 18 August – 27 August | 78.7° | 82.7° | -2.2° |
| 28 August – 6 September | at normal | 80.7° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Kellerton (9 mi).
0
Grand River, Sunday, 9 August
Mostly clear. High 95°, low 74°.
0Grand River, Monday, 10 August
Overcast. High 91°, low 74°.
0
Grand River, Tuesday, 11 August
Clear. High 98°, low 77°.
0.07
Grand River, Wednesday, 12 August
Light rain. High 84°, low 70°.
1.73Grand River, Thursday, 13 August
Heavy rain. High 72°, low 65°.
0.06Grand River, Friday, 14 August
Light rain. High 78°, low 62°.
0.2Grand River, Saturday, 15 August
Light rain. High 68°, low 65°.
0Grand River, Sunday, 16 August
Overcast. High 78°, low 63°.
0.05Grand River, Monday, 17 August
Light rain. High 84°, low 68°.
0.04Grand River, Tuesday, 18 August
Light rain. High 88°, low 69°.
0Grand River, Wednesday, 19 August
Overcast. High 77°, low 65°.
0Grand River, Thursday, 20 August
Overcast. High 72°, low 55°.
0Grand River, Friday, 21 August
Overcast. High 65°, low 53°.
0Grand River, Saturday, 22 August
Overcast. High 84°, low 59°.
0
Grand River, Sunday, 23 August
Partly cloudy. High 87°, low 66°.
0.1Grand River, Monday, 24 August
Climate normal for this date — 60-year average.
0.19Grand River, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.18
Grand River, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.13Grand River, Thursday, 27 August
Climate normal for this date — 60-year average.
0.14Grand River, Friday, 28 August
Climate normal for this date — 60-year average.
0.06Grand River, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Grand River, Sunday, 30 August
Climate normal for this date — 60-year average.
0.11Grand River, Monday, 31 August
Climate normal for this date — 60-year average.
0.09Grand River, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09Grand River, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.11Grand River, Thursday, 3 September
Climate normal for this date — 60-year average.
0.09Grand River, Friday, 4 September
Climate normal for this date — 60-year average.
0.09Grand River, Saturday, 5 September
Climate normal for this date — 60-year average.
0.08Grand River, 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 Grand River, 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 Grand River, 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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