Weather in Grinnell, IA
Grinnell, Sunday, 11 October, 06:09
Clear. Feels like 57°. High 84°, low 57°.
Monthly outlook for Grinnell, IA: average high 62.7°, average low 46.1°. That is 1.2° above the climate normal for October. Precipitation is expected on 4 days (about 1.7 inches), against a normal of 4 days and 1.6 inches. The warmest day looks like 12 October (85.2°), the coolest 17 October (28°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 63.8° | 61.6° | +1.2° |
| 21 October – 30 October | 60.8° | 57.8° | +1.7° |
| 31 October – 9 November | at normal | 52.6° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Malcom (9 mi).
0
Grinnell, Monday, 12 October
Partly cloudy. High 85°, low 68°.
0.71
Grinnell, Tuesday, 13 October
Heavy rain. High 74°, low 59°.
0.12Grinnell, Wednesday, 14 October
Rain. High 67°, low 55°.
0.6Grinnell, Thursday, 15 October
Rain. High 59°, low 55°.
0Grinnell, Friday, 16 October
Light rain. High 57°, low 41°.
0
Grinnell, Saturday, 17 October
Mostly clear. High 41°, low 28°.
0Grinnell, Sunday, 18 October
Mostly clear. High 48°, low 28°.
0Grinnell, Monday, 19 October
Partly cloudy. High 60°, low 37°.
0
Grinnell, Tuesday, 20 October
Clear. High 63°, low 41°.
0Grinnell, Wednesday, 21 October
Clear. High 68°, low 47°.
0Grinnell, Thursday, 22 October
Clear. High 64°, low 50°.
0.28Grinnell, Friday, 23 October
Rain. High 72°, low 48°.
0.02Grinnell, Saturday, 24 October
Light rain. High 55°, low 44°.
0Grinnell, Sunday, 25 October
Mostly clear. High 52°, low 38°.
0Grinnell, Monday, 26 October
Clear. High 54°, low 41°.
0.07Grinnell, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.06Grinnell, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.09Grinnell, Thursday, 29 October
Climate normal for this date — 60-year average.
0.08
Grinnell, Friday, 30 October
Climate normal for this date — 60-year average.
0.14Grinnell, Saturday, 31 October
Climate normal for this date — 60-year average.
0.2Grinnell, Sunday, 1 November
Climate normal for this date — 60-year average.
0.09Grinnell, Monday, 2 November
Climate normal for this date — 60-year average.
0.07Grinnell, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.12Grinnell, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.07Grinnell, Thursday, 5 November
Climate normal for this date — 60-year average.
0.06Grinnell, Friday, 6 November
Climate normal for this date — 60-year average.
0.02Grinnell, Saturday, 7 November
Climate normal for this date — 60-year average.
0.04Grinnell, Sunday, 8 November
Climate normal for this date — 60-year average.
0.09Grinnell, Monday, 9 November
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 Grinnell, 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 Grinnell, 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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