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Grinnell IA Weather - Clear - 56°F
Clear
56°F
Updated 6:27 am
Feels Like 53°F
Humidity 82%
Wind SSE 6 mph
Barometer  29.99 in
Dew Point 51°F
Grinnell IA Weather - Clear - 14°C
Clear
14°C
Updated 6:27 am
Feels Like 12°C
Humidity 82%
Wind SSE 10 km/h
Barometer  101.5 kPa
Dew Point 11°C
Grinnell, IA Weather and Current Conditionsgrinnell ia weather forecast

Grinnell, IA Weather Forecast

Grinnell Iowa WeatherGrinnell, Iowa Weather Weather Forecast
14 Day API Grinnell, IA Weather Forecast. Note: Our 7 day Grinnell, Iowa weather forecast is our most reliable, and specific forecast. This model should only be used as a probable scenario. Forecasting more than 7 days ahead is challenging.
Grinnell, IA Weather Forecast Dated: 627 AM Tue Sep 29 2026
Expect a cool pattern with a mix of sun and clouds and occasional showers over the coming period. generally humid conditions and no major pressure swings will dominate.

Tuesday, September 29, 2026

Mid-Morning
Grinnell Weather - 2026-09-29 - Morning - Overcast
61°F 16°C
Overcast
Mid-Afternoon
Grinnell Weather - 2026-09-29 - Afternoon - Overcast
70°F 21°C
Overcast
Early-Evening
Grinnell Weather - 2026-09-29 - Evening - Overcast
72°F 22°C
Overcast
Pleasant near 70°F 21°C, overcast throughout the day, with steady humidity and barometric pressure falling. Winds out of the SSE at 12 mph 19 km/h. Gusts up to 24 mph 38 km/h.

Wednesday, September 30, 2026

Mid-Morning
Grinnell Weather - 2026-09-30 - Morning - Rain
64°F 18°C
Rain
Mid-Afternoon
Grinnell Weather - 2026-09-30 - Afternoon - Overcast
66°F 19°C
Overcast
Early-Evening
Grinnell Weather - 2026-09-30 - Evening - Light Showers
67°F 20°C
Light Showers
Mildly cool near 66°F 19°C, early showers and late showers with a lull during the afternoon, with steady humidity and steady pressure. Winds switching from the SSE to the SE at 7 mph 10 km/h.

Thursday, October 1, 2026

Mid-Morning
Grinnell Weather - 2026-10-01 - Morning - Overcast
63°F 17°C
Overcast
Mid-Afternoon
Grinnell Weather - 2026-10-01 - Afternoon - Overcast
58°F 14°C
Overcast
Early-Evening
Grinnell Weather - 2026-10-01 - Evening - Overcast
57°F 14°C
Overcast
Comfortable at 58°F 14°C, overcast throughout the day, with lower humidity and barometric pressure rising. Winds moving from the NNW to the NNE at 13 mph 20 km/h. Gusts up to 27 mph 43 km/h.

Friday, October 2, 2026

Mid-Morning
Grinnell Weather - 2026-10-02 - Morning - Sunny
50°F 10°C
Sunny
Mid-Afternoon
Grinnell Weather - 2026-10-02 - Afternoon - Partly Cloudy
62°F 16°C
Partly Cloudy
Early-Evening
Grinnell Weather - 2026-10-02 - Evening - Sunny
59°F 16°C
Sunny
Cool with a high near 62°F 16°C, sunny in the morning, partly cloudy in the afternoon, and sunny this evening, with steady humidity and steady pressure. Winds swinging from the ENE to the E at 7 mph 12 km/h.

Saturday, October 3, 2026

Mid-Morning
Grinnell Weather - 2026-10-03 - Morning - Overcast
52°F 11°C
Overcast
Mid-Afternoon
Grinnell Weather - 2026-10-03 - Afternoon - Partly Cloudy
59°F 15°C
Partly Cloudy
Early-Evening
Grinnell Weather - 2026-10-03 - Evening - Overcast
61°F 16°C
Overcast
Refreshing around 59°F 15°C, overcast in the morning, cloudy in the afternoon, and overcast this evening, with increasing humidity and steady pressure. Winds shifting from the ESE to the SSE at 6 mph 10 km/h.

Sunday, October 4, 2026

Mid-Morning
Grinnell Weather - 2026-10-04 - Morning - Sunny
55°F 13°C
Sunny
Mid-Afternoon
Grinnell Weather - 2026-10-04 - Afternoon - Sunny
60°F 16°C
Sunny
Early-Evening
Grinnell Weather - 2026-10-04 - Evening - Sunny
56°F 13°C
Sunny
Mildly cool near 60°F 16°C, sunny throughout the day, with lower humidity and steady pressure. Winds NNW at 12 mph 19 km/h.

Monday, October 5, 2026

Mid-Morning
Grinnell Weather - 2026-10-05 - Morning - Partly Cloudy
51°F 10°C
Partly Cloudy
Mid-Afternoon
Grinnell Weather - 2026-10-05 - Afternoon - Sunny
59°F 15°C
Sunny
Early-Evening
Grinnell Weather - 2026-10-05 - Evening - Sunny
55°F 13°C
Sunny
Comfortable at 59°F 15°C, partly cloudy in the morning, sunny in the afternoon, and partly cloudy this evening, with steady humidity and steady pressure.

Tuesday, October 6, 2026

Mid-Morning
Grinnell Weather - 2026-10-06 - Morning - Overcast
48°F 9°C
Overcast
Mid-Afternoon
Grinnell Weather - 2026-10-06 - Afternoon - Cloudy
59°F 15°C
Cloudy
Early-Evening
Grinnell Weather - 2026-10-06 - Evening - Sunny
57°F 14°C
Sunny
Cool with a high near 59°F 15°C, overcast in the morning, partly cloudy in the afternoon, and cloudy this evening, with steady humidity and barometric pressure falling. Winds out of the SE at 12 mph 19 km/h. Gusts up to 24 mph 38 km/h.

Wednesday, October 7, 2026

Mid-Morning
Grinnell Weather - 2026-10-07 - Morning - Overcast
51°F 11°C
Overcast
Mid-Afternoon
Grinnell Weather - 2026-10-07 - Afternoon - Overcast
62°F 17°C
Overcast
Early-Evening
Grinnell Weather - 2026-10-07 - Evening - Overcast
58°F 15°C
Overcast
Refreshing around 62°F 17°C, overcast throughout the day, with steady humidity and steady pressure. Winds moving from the SSE to the SSW at 10 mph 15 km/h. Gusts up to 24 mph 39 km/h.

Thursday, October 8, 2026

Mid-Morning
Grinnell Weather - 2026-10-08 - Morning - Light Fog
55°F 13°C
Light Fog
Mid-Afternoon
Grinnell Weather - 2026-10-08 - Afternoon - Sunny
55°F 13°C
Sunny
Early-Evening
Grinnell Weather - 2026-10-08 - Evening - Sunny
52°F 11°C
Sunny
Cool and brisk at 55°F 13°C, sunny throughout the day, with lower humidity and barometric pressure rising. Winds NNW at 17 mph 28 km/h.

Friday, October 9, 2026

Mid-Morning
Grinnell Weather - 2026-10-09 - Morning - Partly Cloudy
45°F 7°C
Partly Cloudy
Mid-Afternoon
Grinnell Weather - 2026-10-09 - Afternoon - Cloudy
54°F 12°C
Cloudy
Early-Evening
Grinnell Weather - 2026-10-09 - Evening - Overcast
52°F 11°C
Overcast
Chilly near 54°F 12°C, cloudy in the morning, becoming overcast through the afternoon and evening, with steady humidity and barometric pressure falling. Winds picking up from W at 3 mph 5 km/h to SSW at 12 mph 20 km/h. Gusts up to 23 mph 37 km/h.

Saturday, October 10, 2026

Mid-Morning
Grinnell Weather - 2026-10-10 - Morning - Overcast
49°F 9°C
Overcast
Mid-Afternoon
Grinnell Weather - 2026-10-10 - Afternoon - Overcast
48°F 9°C
Overcast
Early-Evening
Grinnell Weather - 2026-10-10 - Evening - Overcast
45°F 8°C
Overcast
Crisp with a high near 48°F 9°C, overcast throughout the day, with lower humidity and steady pressure. Winds blowing from the NNW at 13 mph 21 km/h.

Sunday, October 11, 2026

Mid-Morning
Grinnell Weather - 2026-10-11 - Morning - Heavy Rain Showers
34°F 1°C
Heavy Rain Showers
Mid-Afternoon
Grinnell Weather - 2026-10-11 - Afternoon - Light Fog
41°F 5°C
Light Fog
Early-Evening
Grinnell Weather - 2026-10-11 - Evening - Scattered Showers
41°F 5°C
Scattered Showers
Nippy around 41°F 5°C, periods of heavy rain and gusty conditions, with lower humidity and steady pressure. Winds switching from the NW to the NNW at 8 mph 13 km/h.

Monday, October 12, 2026

Mid-Morning
Grinnell Weather - 2026-10-12 - Morning - Sunny
35°F 2°C
Sunny
Mid-Afternoon
Grinnell Weather - 2026-10-12 - Afternoon - Overcast
42°F 6°C
Overcast
Early-Evening
Grinnell Weather - 2026-10-12 - Evening - Scattered Showers
36°F 2°C
Scattered Showers
Biting cold near 42°F 6°C, scattered downpours possible, with increasing humidity and barometric pressure falling. Winds moving from the NW to the WSW at 8 mph 12 km/h.

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Weather by the Numbers

Tue, 29th
Grinnell IA Weather - Tuesday, Sep 29, 2026 - Overcast
Hi: 72°F 22°C
Lo: 57°F 14°C
Sunrise 07:06 AM
Sunset 06:56 PM
Wind SSE 13 mph21 km/h
Dew Point 51°F10°C
uv Index 4
Barometric Pressure 29.91 in1013 mb
POP 14% *
Humidity 59%
Wed, 30th
Grinnell IA Weather - Wednesday, Sep 30, 2026 - Light Rain Shower
Hi: 69°F 21°C
Lo: 62°F 17°C
Sunrise 07:07 AM
Sunset 06:54 PM
Wind S 9 mph14 km/h
Dew Point 62°F17°C
uv Index 0
Barometric Pressure 29.77 in1008 mb
POP 68% *
Humidity 96%
Thu, 1st
Grinnell IA Weather - Thursday, Oct 1, 2026 - Overcast
Hi: 66°F 19°C
Lo: 56°F 13°C
Sunrise 07:08 AM
Sunset 06:52 PM
Wind N 14 mph23 km/h
Dew Point 55°F13°C
uv Index 1
Barometric Pressure 30 in1016 mb
POP 25% *
Humidity 81%
Fri, 2nd
Grinnell IA Weather - Friday, Oct 2, 2026 - Sunny
Hi: 62°F 17°C
Lo: 48°F 9°C
Sunrise 07:09 AM
Sunset 06:51 PM
Wind E 9 mph15 km/h
Dew Point 42°F6°C
uv Index 4
Barometric Pressure 30.27 in1025 mb
POP 3% *
Humidity 56%
Sat, 3rd
Grinnell IA Weather - Saturday, Oct 3, 2026 - Patchy Rain Nearby
Hi: 62°F 17°C
Lo: 51°F 11°C
Sunrise 07:10 AM
Sunset 06:49 PM
Wind SE 9 mph14 km/h
Dew Point 46°F8°C
uv Index 3
Barometric Pressure 30.09 in1019 mb
POP 17% *
Humidity 79%
Sun, 4th
Grinnell IA Weather - Sunday, Oct 4, 2026 - Sunny
Hi: 63°F 17°C
Lo: 53°F 12°C
Sunrise 07:11 AM
Sunset 06:47 PM
Wind NNW 14 mph22 km/h
Dew Point 43°F6°C
uv Index 4
Barometric Pressure 30.18 in1022 mb
POP 3% *
Humidity 58%
Mon, 5th
Grinnell IA Weather - Monday, Oct 5, 2026 - Sunny
Hi: 59°F 15°C
Lo: 49°F 10°C
Sunrise 07:12 AM
Sunset 06:45 PM
Wind NE 6 mph10 km/h
Dew Point 38°F3°C
uv Index 4
Barometric Pressure 30.36 in1028 mb
POP 2% *
Humidity 52%
Tue, 6th
Grinnell IA Weather - Tuesday, Oct 6, 2026 - Overcast
Hi: 60°F 16°C
Lo: 46°F 8°C
Sunrise 07:13 AM
Sunset 06:44 PM
Wind SE 13 mph21 km/h
Dew Point 39°F4°C
uv Index 3
Barometric Pressure 30.27 in1025 mb
POP 12% *
Humidity 56%
Wed, 7th
Grinnell IA Weather - Wednesday, Oct 7, 2026 - Overcast
Hi: 64°F 18°C
Lo: 51°F 11°C
Sunrise 07:15 AM
Sunset 06:42 PM
Wind S 10 mph17 km/h
Dew Point 43°F6°C
uv Index 3
Barometric Pressure 30 in1016 mb
POP 15% *
Humidity 61%
Thu, 8th
Grinnell IA Weather - Thursday, Oct 8, 2026 - Sunny
Hi: 56°F 14°C
Lo: 47°F 9°C
Sunrise 07:16 AM
Sunset 06:40 PM
Wind NNW 17 mph28 km/h
Dew Point 42°F6°C
uv Index 4
Barometric Pressure 30.09 in1019 mb
POP 4% *
Humidity 61%
Fri, 9th
Grinnell IA Weather - Friday, Oct 9, 2026 - Overcast
Hi: 55°F 13°C
Lo: 42°F 6°C
Sunrise 07:17 AM
Sunset 06:39 PM
Wind SW 7 mph11 km/h
Dew Point 32°F0°C
uv Index 3
Barometric Pressure 30.18 in1022 mb
POP 11% *
Humidity 50%
Sat, 10th
Grinnell IA Weather - Saturday, Oct 10, 2026 - Cloudy
Hi: 55°F 13°C
Lo: 43°F 6°C
Sunrise 07:18 AM
Sunset 06:37 PM
Wind NNW 15 mph25 km/h
Dew Point 36°F2°C
uv Index 2
Barometric Pressure 29.94 in1014 mb
POP 13% *
Humidity 61%
Sun, 11th
Grinnell IA Weather - Sunday, Oct 11, 2026 - Light Sleet Showers
Hi: 44°F 6°C
Lo: 34°F 1°C
Sunrise 07:19 AM
Sunset 06:35 PM
Wind NW 7 mph12 km/h
Dew Point 35°F1°C
uv Index 1
Barometric Pressure 30.09 in1019 mb
POP 58% *
Humidity 96%
Mon, 12th
Grinnell IA Weather - Monday, Oct 12, 2026 - Overcast
Hi: 42°F 6°C
Lo: 32°F 0°C
Sunrise 07:20 AM
Sunset 06:34 PM
Wind NW 5 mph9 km/h
Dew Point 19°F-7°C
uv Index 1
Barometric Pressure 30.18 in1022 mb
POP 9% *
Humidity 42%
* POP = Probability of Precipitation. Data for 12:00 PM.