Live Weather & Forecast

Weather in Sumner

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

Flag of United States
Overcast
17°C
Feels like 17°C
63°F / Feels 63°F
Overcast
Sumner, Iowa
🌞 Daytime
Updated: 2026-04-15 15:30
💧
Humidity
100%
💨
Wind
6.5 km/h NNE
🌬️
Wind Gust
9.6 km/h
🌡️
Pressure
1006 mb
👁️
Visibility
16 km
☀️
UV Index
1.3 (Low)
🌧️
Precipitation
0.24 mm
☁️
Cloud Cover
100%
💦
Dew Point
16.5°C
🌐
Wind Degree
11°

Air Quality Index

US EPA: Good UK DEFRA: Low (1)
CO
172.9 μg/m³
NO₂
6.1 μg/m³
O₃
67 μg/m³
SO₂
1.2 μg/m³
PM 2.5
10.9 μg/m³
PM 10
12.9 μg/m³

Weather Alerts 3

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 · Future
Flood Watch issued April 15 at 2:50AM CDT until April 16 at 12:00AM CDT by NWS Quad Cities IA IL

* WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...Portions of northwest Illinois, including the following counties, Carroll, Jo Daviess and Stephenson and Iowa, including the following counties, Benton, Buchanan, Delaware, Dubuque, Jackson, Jones and Linn. * WHEN...Through this evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and...

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Effective: 2026-04-15T02:50:00-05:00  ·  Expires: 2026-04-16T00:00:00-05:00
Met · Severe · Future
Flood Watch issued April 15 at 12:38PM CDT until April 16 at 12:00AM CDT by NWS Quad Cities IA IL

* WHAT...Flooding caused by excessive rainfall continues to be possible. * WHERE...Portions of northwest Illinois, including the following counties, Carroll, Jo Daviess and Stephenson and Iowa, including the following counties, Benton, Buchanan, Delaware, Dubuque, Jackson, Jones and Linn. * WHEN...Until midnight CDT tonight. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks,...

You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop.

Effective: 2026-04-15T12:38:00-05:00  ·  Expires: 2026-04-16T00:00:00-05:00

Today's Hourly Forecast

24-hour breakdown for Sumner, Iowa

12 AM
Cloudy
17°
Cloudy
💧 95% 💨 11.5 km/h
1 AM
Partly Cloudy
16°
Partly Cloudy
💧 94% 💨 8.6 km/h
2 AM
Mist
16°
Mist
💧 95% 💨 5 km/h
3 AM
Mist
16°
Mist
💧 94% 💨 7.2 km/h
4 AM
Light drizzle
16°
Light drizzle
💧 95% 💨 4.3 km/h 🌧️ 100%
5 AM
Light rain
16°
Light rain
💧 96% 💨 7.2 km/h 🌧️ 100%
6 AM
Light rain
15°
Light rain
💧 98% 💨 10.8 km/h 🌧️ 100%
7 AM
Mist
15°
Mist
💧 95% 💨 11.5 km/h 🌧️ 83%
8 AM
Overcast
16°
Overcast
💧 95% 💨 4.3 km/h
9 AM
Overcast
16°
Overcast
💧 94% 💨 6.5 km/h
10 AM
Overcast
17°
Overcast
💧 94% 💨 7.9 km/h
11 AM
Overcast
17°
Overcast
💧 88% 💨 1.8 km/h
12 PM
Overcast
17°
Overcast
💧 89% 💨 2.5 km/h
1 PM
Light rain
17°
Light rain
💧 95% 💨 5.4 km/h 🌧️ 100%
2 PM
Light drizzle
17°
Light drizzle
💧 94% 💨 6.1 km/h 🌧️ 100%
3 PM
Overcast
17°
Overcast
💧 100% 💨 6.5 km/h 🌧️ 100%
4 PM
Patchy rain nearby
18°
Patchy rain nearby
💧 90% 💨 6.1 km/h 🌧️ 85%
5 PM
Moderate rain
17°
Moderate rain
💧 96% 💨 5.4 km/h 🌧️ 100%
6 PM
Light drizzle
17°
Light drizzle
💧 92% 💨 3.6 km/h 🌧️ 100%
7 PM
Patchy rain nearby
15°
Patchy rain nearby
💧 90% 💨 4 km/h 🌧️ 100%
8 PM
Patchy light drizzle
14°
Patchy light drizzle
💧 85% 💨 8.6 km/h 🌧️ 100%
9 PM
Clear
13°
Clear
💧 83% 💨 11.5 km/h
10 PM
Clear
12°
Clear
💧 85% 💨 9.7 km/h
11 PM
Clear
12°
Clear
💧 86% 💨 9 km/h

3-Day Forecast

Daily overview for Sumner, Iowa

Today
Moderate rain
Moderate rain
19° / 12°
🌧️ 89% chance of rain
💧 Avg. humidity: 92%
💨 Max wind: 11.5 km/h
🌧️ Total precip: 8.22 mm
☀️ UV Index: 0.8
🌅 Sunrise: 06:26 AM
🌇 Sunset: 07:51 PM
🌙 Waning Crescent
🌑 Moon: 8% lit
Thu, Apr 16
Partly Cloudy
Partly Cloudy
25° / 10°
🌧️ 0% chance of rain
💧 Avg. humidity: 81%
💨 Max wind: 20.5 km/h
🌧️ Total precip: 0.06 mm
☀️ UV Index: 1.7
🌅 Sunrise: 06:25 AM
🌇 Sunset: 07:52 PM
🌙 Waning Crescent
🌑 Moon: 3% lit
Fri, Apr 17
Heavy rain
Heavy rain
23° / 5°
🌧️ 89% chance of rain
💧 Avg. humidity: 88%
💨 Max wind: 37.1 km/h
🌧️ Total precip: 81.33 mm
☀️ UV Index: 1.5
🌅 Sunrise: 06:23 AM
🌇 Sunset: 07:53 PM
🌙 New Moon
🌑 Moon: 0% lit

Best Time to Visit Sumner

Plan your trip to Sumner, 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 Sumner 🗓 View Holidays 2026

Frequently Asked Questions

What is the current weather in Sumner?
Current conditions in Sumner: Overcast, temperature 17°C, humidity 100%.
What is the best time to visit Sumner?
The best time to visit Sumner is typically June – September. Warm, dry summers — ideal for outdoor activities.
What is the climate like in Sumner?
Sumner is located at approximately 42.8° latitude. It has a temperate climate with warm summers and cold winters.
Does it rain a lot in Sumner?
The wettest period in Sumner is typically during November – March. Cooler temperatures; some regions may experience rain or snow.
What should I pack for a trip to Sumner?
For visits to Sumner during June – September: light clothing and sun protection. For November – March: layers and a waterproof jacket are recommended.
What country is Sumner in?
Sumner is located in United States, in the state of Iowa.
What are the public holidays in Sumner in 2026?
View the 2026 public holidays for Sumner on our Holidays page.
What are the GPS coordinates used for the weather forecast in Sumner?
The weather forecast for Sumner uses coordinates 42.8489, -92.0971.