Weather in Grundy Center, IA
Grundy Center, Sunday, 9 August, 05:43
Heavy rain. Feels like 67°. High 92°, low 66°.
Monthly outlook for Grundy Center, IA: average high 83.2°, average low 66.3°. That is 2.1° above the climate normal for August. Precipitation is expected on 4 days (about 1.4 inches), against a normal of 5 days and 2.2 inches. The warmest day looks like 22 August (97.2°), the coolest 15 August (57.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 80.5° | 79.5° | +0.6° |
| 19 August – 28 August | 87.7° | 79.7° | +4.5° |
| 29 August – 7 September | at normal | 78° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Whitten (14 mi).
0.19Grundy Center, Monday, 10 August
Rain. High 85°, low 71°.
0Grundy Center, Tuesday, 11 August
Light rain. High 88°, low 70°.
0
Grundy Center, Wednesday, 12 August
Overcast. High 83°, low 67°.
0.66Grundy Center, Thursday, 13 August
Rain. High 69°, low 61°.
0.04Grundy Center, Friday, 14 August
Light rain. High 73°, low 58°.
0.03Grundy Center, Saturday, 15 August
Light rain. High 70°, low 58°.
0Grundy Center, Sunday, 16 August
Overcast. High 79°, low 66°.
0Grundy Center, Monday, 17 August
Overcast. High 81°, low 64°.
0Grundy Center, Tuesday, 18 August
Light rain. High 85°, low 64°.
0Grundy Center, Wednesday, 19 August
Overcast. High 89°, low 69°.
0
Grundy Center, Thursday, 20 August
Mostly clear. High 93°, low 72°.
0.02Grundy Center, Friday, 21 August
Light rain. High 79°, low 67°.
0
Grundy Center, Saturday, 22 August
Clear. High 97°, low 70°.
0.01Grundy Center, Sunday, 23 August
Light rain. High 87°, low 72°.
0.35Grundy Center, Monday, 24 August
Rain. High 81°, low 65°.
0.14
Grundy Center, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.17
Grundy Center, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.16Grundy Center, Thursday, 27 August
Climate normal for this date — 60-year average.
0.19Grundy Center, Friday, 28 August
Climate normal for this date — 60-year average.
0.1Grundy Center, Saturday, 29 August
Climate normal for this date — 60-year average.
0.11Grundy Center, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Grundy Center, Monday, 31 August
Climate normal for this date — 60-year average.
0.09Grundy Center, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.09Grundy Center, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.1Grundy Center, Thursday, 3 September
Climate normal for this date — 60-year average.
0.08Grundy Center, Friday, 4 September
Climate normal for this date — 60-year average.
0.11Grundy Center, Saturday, 5 September
Climate normal for this date — 60-year average.
0.09Grundy Center, Sunday, 6 September
Climate normal for this date — 60-year average.
0.16Grundy Center, 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 Grundy Center, 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 Grundy Center, 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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