Forecast for Johnston, IA | Forecast Periods: 14
Monday
Mar 16
2026
Johnston, IA
Updated: 2:27 PM CDT
20°F
Mostly Sunny
24 mph NW
Precipitation: 0%
Mostly sunny, with a high near 20. Wind chill values as low as 2. Northwest wind around 24 mph, with gusts as high as 32 mph.
Hourly Forecast
Extended Forecast
Tonight
Mon, Mar 16
5°F
Mostly Clear
5 mph NW
Precipitation: 0%
Mostly clear. Low around 5, with temperatures rising to around 7 overnight. Wind chill values as low as -4. Northwest wind 5 to 22 mph, with gusts as high as 30 mph.
Tuesday
Tue, Mar 17
31°F
Partly Sunny then Chance Snow Showers
2 mph SSW
Precipitation: 40%
A chance of snow showers between 1pm and 3pm, then a chance of snow. Partly sunny. High near 31, with temperatures falling to around 29 in the afternoon. Wind chill values as low as 0. South southwest wind 2 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New snow accumulation of less than half an inch possible.
Tuesday Night
Tue, Mar 17
24°F
Chance Light Snow then Mostly Cloudy
5 mph S
Precipitation: 42%
A chance of snow before midnight. Mostly cloudy. Low around 24, with temperatures rising to around 26 overnight. South wind 5 to 13 mph, with gusts as high as 21 mph. Chance of precipitation is 40%. New snow accumulation of less than one inch possible.
Wednesday
Wed, Mar 18
56°F
Mostly Sunny
6 mph W
Precipitation: 1%
Mostly sunny, with a high near 56. West wind around 6 mph.
Wednesday Night
Wed, Mar 18
38°F
Mostly Cloudy
5 mph SW
Precipitation: 0%
Mostly cloudy, with a low around 38.
Thursday
Thu, Mar 19
66°F
Sunny
7 mph NNW
Precipitation: 0%
Sunny, with a high near 66.
Thursday Night
Thu, Mar 19
44°F
Partly Cloudy
6 mph SSE
Precipitation: 0%
Partly cloudy, with a low around 44.
Friday
Fri, Mar 20
76°F
Mostly Sunny
6 mph WSW
Precipitation: 0%
Mostly sunny, with a high near 76.
Friday Night
Fri, Mar 20
46°F
Mostly Cloudy
6 mph WNW
Precipitation: 0%
Mostly cloudy, with a low around 46.
Saturday
Sat, Mar 21
76°F
Mostly Sunny
6 mph WSW
Precipitation: 1%
Mostly sunny, with a high near 76.
Saturday Night
Sat, Mar 21
44°F
Mostly Clear
12 mph NNW
Precipitation: 3%
Mostly clear, with a low around 44.
Sunday
Sun, Mar 22
59°F
Mostly Sunny
12 mph NNW
Precipitation: 3%
Mostly sunny, with a high near 59.
Sunday Night
Sun, Mar 22
32°F
Partly Cloudy
9 mph NNE
Precipitation: 2%
Partly cloudy, with a low around 32.