Live Weather & Forecast

Weather in Grimes

Iowa, United States · Real-time conditions & 3-day outlook

Flag of United States
Partly cloudy
21°C
Feels like 21°C
70°F / Feels 70°F
Partly cloudy
Grimes, Iowa
🌞 Daytime
Updated: 2026-04-15 15:45
💧
Humidity
73%
💨
Wind
17.3 km/h SW
🌬️
Wind Gust
21.8 km/h
🌡️
Pressure
1004 mb
👁️
Visibility
16 km
☀️
UV Index
2.3 (Low)
🌧️
Precipitation
0 mm
☁️
Cloud Cover
75%
💦
Dew Point
19.8°C
🌐
Wind Degree
225°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
193.9 μg/m³
NO₂
13.1 μg/m³
O₃
79 μg/m³
SO₂
1.7 μg/m³
PM 2.5
6.1 μg/m³
PM 10
7.3 μg/m³

Weather Alerts 2

Met · Severe · Future
Severe Thunderstorm Watch issued April 15 at 12:28PM CDT until April 15 at 7:00PM CDT by NWS Des Moines IA

THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 119 IN EFFECT UNTIL 7 PM CDT THIS EVENING FOR THE FOLLOWING AREAS IN IOWA THIS WATCH INCLUDES 25 COUNTIES IN CENTRAL IOWA BOONE DALLAS GRUNDY HAMILTON HARDIN JASPER MARSHALL POLK POWESHIEK STORY TAMA WEBSTER...

Effective: 2026-04-15T12:28:00-05:00  ·  Expires: 2026-04-15T19:00:00-05:00
Met · Severe · Immediate
Severe Thunderstorm Warning issued April 15 at 1:29PM CDT until April 15 at 1:45PM CDT by NWS Des Moines IA

At 129 PM CDT, a severe thunderstorm was located over Pilot Mound, or 12 miles northwest of Boone, moving east at 40 mph. HAZARD...60 mph wind gusts and quarter size hail. SOURCE...Trained weather spotters. IMPACT...Hail damage to vehicles is expected. Expect wind damage to roofs, siding, and trees. Locations impacted include... Boone, Ogden, Boone Speedway, Dayton, Stratford, Lehigh, Boxholm,...

For your protection move to an interior room on the lowest floor of a building.

Effective: 2026-04-15T13:29:00-05:00  ·  Expires: 2026-04-15T13:45:00-05:00

Today's Hourly Forecast

24-hour breakdown for Grimes, Iowa

12 AM
Patchy rain nearby
19°
Patchy rain nearby
💧 89% 💨 22.7 km/h 🌧️ 100%
1 AM
Patchy rain nearby
18°
Patchy rain nearby
💧 89% 💨 22.3 km/h 🌧️ 100%
2 AM
Moderate rain at times
17°
Moderate rain at times
💧 90% 💨 11.2 km/h 🌧️ 100%
3 AM
Patchy rain nearby
17°
Patchy rain nearby
💧 92% 💨 17.3 km/h 🌧️ 100%
4 AM
Patchy rain nearby
16°
Patchy rain nearby
💧 91% 💨 6.8 km/h 🌧️ 100%
5 AM
Patchy rain nearby
16°
Patchy rain nearby
💧 92% 💨 5.4 km/h 🌧️ 100%
6 AM
Mist
15°
Mist
💧 94% 💨 5.8 km/h
7 AM
Mist
15°
Mist
💧 96% 💨 4.3 km/h
8 AM
Mist
16°
Mist
💧 95% 💨 6.1 km/h
9 AM
Mist
17°
Mist
💧 95% 💨 11.2 km/h
10 AM
Cloudy
18°
Cloudy
💧 90% 💨 19.4 km/h
11 AM
Partly Cloudy
18°
Partly Cloudy
💧 88% 💨 20.9 km/h
12 PM
Patchy rain nearby
19°
Patchy rain nearby
💧 88% 💨 18 km/h 🌧️ 79%
1 PM
Light drizzle
19°
Light drizzle
💧 92% 💨 19.1 km/h 🌧️ 100%
2 PM
Patchy rain nearby
21°
Patchy rain nearby
💧 91% 💨 18.7 km/h 🌧️ 84%
3 PM
Partly cloudy
21°
Partly cloudy
💧 73% 💨 17.3 km/h
4 PM
Sunny
24°
Sunny
💧 80% 💨 15.5 km/h
5 PM
Sunny
24°
Sunny
💧 81% 💨 15.5 km/h
6 PM
Partly Cloudy
21°
Partly Cloudy
💧 84% 💨 11.2 km/h
7 PM
Cloudy
18°
Cloudy
💧 91% 💨 6.5 km/h
8 PM
Partly Cloudy
17°
Partly Cloudy
💧 92% 💨 15.1 km/h
9 PM
Clear
16°
Clear
💧 91% 💨 13 km/h
10 PM
Cloudy
15°
Cloudy
💧 89% 💨 17.3 km/h
11 PM
Cloudy
14°
Cloudy
💧 86% 💨 19.8 km/h

3-Day Forecast

Daily overview for Grimes, Iowa

Today
Moderate rain
Moderate rain
26° / 14°
🌧️ 84% chance of rain
💧 Avg. humidity: 90%
💨 Max wind: 22.7 km/h
🌧️ Total precip: 14.43 mm
☀️ UV Index: 1.1
🌅 Sunrise: 06:34 AM
🌇 Sunset: 07:56 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Thu, Apr 16
Partly Cloudy
Partly Cloudy
28° / 9°
🌧️ 0% chance of rain
💧 Avg. humidity: 78%
💨 Max wind: 23.8 km/h
🌧️ Total precip: 0 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:33 AM
🌇 Sunset: 07:57 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Moderate rain
Moderate rain
23° / 5°
🌧️ 89% chance of rain
💧 Avg. humidity: 88%
💨 Max wind: 38.5 km/h
🌧️ Total precip: 13.27 mm
☀️ UV Index: 1.6
🌅 Sunrise: 06:31 AM
🌇 Sunset: 07:58 PM
🌙 New Moon
🌑 Moon: 0% lit

Best Time to Visit Grimes

Plan your trip to Grimes, United States around the most favorable weather conditions.

Peak Season
June – September
Warm, dry summers — ideal for outdoor activities.
Shoulder Season
April – May, October
Fewer crowds, moderate prices, mild weather.
Off Season
November – March
Cooler temperatures; some regions may experience rain or snow.
← Back to Grimes 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Grimes?
Current conditions in Grimes: Partly cloudy, temperature 21°C, humidity 73%.
What is the best time to visit Grimes?
The best time to visit Grimes is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Grimes?
Grimes is located at approximately 41.7° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Grimes?
The wettest period in Grimes is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Grimes?
For visits to Grimes during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Grimes in?
Grimes is located in United States, in the state of Iowa.
What are the public holidays in Grimes in 2026?
View the 2026 public holidays for Grimes on our Holidays page.
What are the GPS coordinates used for the weather forecast in Grimes?
The weather forecast for Grimes uses coordinates 41.6883, -93.7911.