Johnston, IA Weather Forecast
Polk County, Iowa
Live radar, warnings and storm tracking for Johnston, with free alerts the moment it counts.
The next few hours
Taller, warmer bars mean heavier rain. Dotted means no reading for that hour.
Hour by hour
Sunrise and sunset
Next five days, scored 0 to 100The first day or two use the HRRR and NBM cloud layers. Later days only have total cloud, so treat them as a rough guide.
Know when sunset at this place will be worth a photo
We score every sunrise and sunset here from the cloud, haze and smoke forecast, and let you know when one is likely to light up. Sunrise the evening before, sunset a few hours ahead.
Seven-day outlook
Free alerts for Johnston
Every NWS warning, pushed to your phone, inbox or webhook the moment it is issued.
Johnston, IA at a glance
Johnston is home to about 24,640 people in Polk County, across 19 square miles. It ranks 20th by population of 139 places in Iowa with a forecast here. The nearest neighbour with its own forecast is Grimes, 4 miles away.
- County
- Polk County
- Population
- 24,640 2023 est.
- Land area
- 19 sq mi
- People per sq mi
- 1,264
- Forecast point
- 41.6919°N, 93.7245°W
How well can the network see Johnston?
The nearest Doppler radar is KDMX (Des Moines, IA), to the N. Its lowest scan passes about 130 ft above Johnston. That is about as close as US radar coverage gets: low-level rotation and gust fronts over Johnston show up clearly. Johnston is closer to its radar than 99% of US cities.
The closest weather station is KIKV (Ankeny Rgnl). Representative on most days, though a thunderstorm can hit one and miss the other.
Forecasts near Johnston
- Grimes, IA4 mi
- Urbandale, IA5 mi
- Windsor Heights, IA6 mi
- Polk City, IA6 mi
- Clive, IA7 mi
- Ankeny, IA7 mi
- Des Moines, IA10 mi
- West Des Moines, IA10 mi
Elsewhere in Iowa
Des MoinesCedar RapidsDavenportSioux CityIowa CityAnkenyAll Iowa forecasts →