Go Back
  • For Business
  • |
  • Warnings
  • Data Suite
  • Forensics
  • Advertising
  • Superior Accuracy™
Over 250 million face dangerous heat dome into 4th of July weekend. Click for details. Chevron right
Where will there be storms into 4th of July weekend? Click for the forecast. Chevron right

Johnston, IA

88°F
Location Chevron down
Location News Videos
Use Current Location
Recent

Johnston

Iowa

88°
No results found.
Try searching for a city, zip code or point of interest.
Get Premium+
Create Your Account Unlock extended daily and hourly forecasts — all with your free account.
Let's Go Chevron right
Have an account already? Log In
settings
Help
Johnston, IA Weather
Today WinterCast Local {stormName} Tracker Hourly 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps
News

News & Features

Astronomy

Business

Climate

Health

Recreation

Sports

Travel
For Business

Warnings

Data Suite

Forensics

Advertising

Superior Accuracy™

Video

Winter Center
Today

Hourly

 10-Day Radar MinuteCast® Monthly Air Quality Health & Activities

View hourly forecasts 10-days ahead

Activate Your Premium+ Subscription

Chevron right

9 PM

85°
RealFeel® 94°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
rain drop 15%
Chevron down
Partly cloudy
alerts

Extreme Heat Warning

1:00 PM Sunday - 10:00 PM Thursday

Heat Index95°

WindSSW 10 mph

Air QualityPoor

Wind Gusts15 mph

Humidity76%

Indoor Humidity76% (Extremely Humid)

Dew Point77° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover42%

Visibility10 mi

Cloud Ceiling33300 ft

10 PM

83°
RealFeel® 91°
Hot
RealFeel Guide
Hot
90° to 100°
Caution advised. Possible danger of dehydration, heat stroke, heat exhaustion and heat cramps if outside for extended periods, and especially while doing strenuous activities.
LEARN MORE
rain drop 19%
Chevron down
Intermittent clouds
alerts

Extreme Heat Warning

1:00 PM Sunday - 10:00 PM Thursday

Heat Index91°

WindSSW 10 mph

Air QualityPoor

Wind Gusts14 mph

Humidity82%

Indoor Humidity82% (Extremely Humid)

Dew Point77° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling30000 ft

11 PM

80°
RealFeel® 87°
Very Warm
RealFeel Guide
Very Warm
82° to 89°
Older adults, infants, and those with sensitive medical conditions should minimize outdoor activity, especially in the sunshine.
LEARN MORE
rain drop 47%
Chevron down
Intermittent clouds
alerts

Extreme Heat Warning

1:00 PM Sunday - 10:00 PM Thursday

Heat Index86°

WindSSW 10 mph

Air QualityPoor

Wind Gusts12 mph

Humidity84%

Indoor Humidity84% (Extremely Humid)

Dew Point75° F

AccuLumen Brightness Index™0 (Dark)

Cloud Cover70%

Visibility10 mi

Cloud Ceiling4000 ft

Hourly Weather Forecast for Johnston

AccuWeather's hourly forecast for Johnston provides hour-by-hour temperatures, RealFeel® Temperature, and precipitation probability through the next 10 days. The current hour shows 85° with a RealFeel® of 94°, partly cloudy with a 15% chance of precipitation. Each hourly forecast includes wind speed, humidity, air quality, UV index, and the AccuLumen Brightness Index™, AccuWeather's measure of perceived outdoor light intensity. Forecasts are generated by proprietary systems developed by AccuWeather meteorologists since 1962.

Further Ahead

Tomorrow

Thursday

10-Day

Around the Globe

Hurricane Tracker

Severe Weather

Radar & Maps

News

Video

Winter Center

Top Stories

Weather Forecasts

Fourth of July week furnace: Dangerous heat dome for 250 million

8 hours ago

Severe Weather

Thunderstorms to circle massive heat furnace into Fourth of July

5 hours ago
Live Blog

Live: World Cup 2026 weather updates

LATEST ENTRY

Dangerous heat to impact fans outside Dallas, Atlanta matches

9 hours ago

Weather Forecasts

Fourth of July weather forecast: Heat, storms and smoke ahead

7 hours ago

Weather News

Why heat waves can turn deadly: AccuWeather index tracks intensity

11 hours ago

 More Stories

Featured Stories

Astronomy

Asteroid Day marks 1908 impact as scientists ready for new discoveries

10 hours ago

Weather News

Chicks fly from nest of famous California eagles Jackie and Shadow

10 hours ago

Weather News

Venezuela death toll surges as crews search after earthquakes

2 days ago

Recreation

12-year-old injured by bison in Yellowstone National Park

1 day ago

Weather News

At least 4 dead in Kentucky floods with more rainfall on the way

2 days ago
World North America United States Iowa Johnston

Weather Near Johnston:

  • Ames, IA
  • Des Moines, IA
  • West Des Moines, IA
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
Company
Proven Superior Accuracy™ About AccuWeather Digital Advertising Careers Press Contact Us
Products & Services
For Business For Partners For Advertising AccuWeather APIs AccuWeather Connect Personal Weather Stations
Apps & Downloads
iPhone App Android App See all Apps & Downloads
Subscription Services
AccuWeather Premium AccuWeather Professional
More
AccuWeather Ready Business Health Hurricane Leisure and Recreation Severe Weather Space and Astronomy Sports Travel Weather News Winter Center
© 2026 AccuWeather, Inc. "AccuWeather" and sun design are registered trademarks of AccuWeather, Inc. All Rights Reserved.
Terms of Use | Privacy Policy | Cookie Policy | About Your Privacy Do Not Sell or Share My Personal Information | Data Sources

...

...

...