NimbocastJohnston, IA Weather
Live radar, hourly and 7-day forecast, and National Weather Service alerts for Johnston, Polk County, Iowa.
Updated Jul 29, 2026, 4:08 PM local time · Radar refreshes every 5 minutes
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Johnston
86°F
Wind 9 mph
Humidity 56%
Cloud cover 2%
UV index 8
Alerts 0
Active alerts
✓
No active National Weather Service alerts for Johnston, IA.
Johnston weather radar
Light
Heavy
Next 24 hours
Now
☀️
86°F
1%
5 PM
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86°F
6 PM
☀️
85°F
7 PM
☀️
83°F
8 PM
☀️
80°F
9 PM
☀️
77°F
10 PM
☀️
75°F
11 PM
☀️
74°F
12 AM
☀️
73°F
1 AM
☀️
71°F
2 AM
☀️
70°F
3 AM
☀️
69°F
4 AM
☁️
68°F
5 AM
☁️
68°F
6 AM
☁️
67°F
7 AM
☁️
67°F
8 AM
☁️
71°F
9 AM
☁️
74°F
10 AM
☁️
78°F
11 AM
☁️
81°F
12 PM
☁️
84°F
1 PM
☁️
87°F
2 PM
☁️
88°F
3 PM
☁️
89°F
7-day forecast
Today
Jul 29
☁️
86°F
70°F
1%
Thu
Jul 30
☁️
90°F
67°F
11%
Fri
Jul 31
🌦️
75°F
63°F
95%
Sat
Aug 1
☁️
83°F
60°F
26%
Sun
Aug 2
☁️
91°F
64°F
3%
Mon
Aug 3
☁️
95°F
66°F
3%
Tue
Aug 4
☁️
94°F
63°F
7%
Weather near Johnston
3 mi
Urbandale, IA5 mi
Clive, IA6 mi
Ankeny, IA7 mi
Des Moines, IA7 mi
West Des Moines, IA11 mi
Waukee, IA12 mi
Altoona, IA23 mi
Indianola, IA
Alerts are relayed from the National Weather Service and may lag
the official source. In a life-threatening situation always follow
weather.gov and local emergency
broadcasts.