Johnston, IA Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Johnston, IA in one place.
Sunny, with a high near 86. South southeast wind 3 to 8 mph.
Local Weather Overview
This forecast page for Johnston, IA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: May 24, 2026 11:59 AM CDT.
The active forecast window currently covers May 26 to May 30, 2026 for Johnston, IA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- May 26 to May 30, 2026
- Latest sync
- May 24, 2026 11:59 AM CDT
- Forecast office
- DMX
- Source
- NOAA / NWS
Daily Outlook
This Week in Johnston
Tuesday looks like the warmest upcoming period in Johnston at 86 degrees F.
Saturday Night is the coolest period ahead with temperatures near 56 degrees F.
The strongest winds are forecast for Wednesday at about 2 to 9 mph E.
Precipitation is mentioned in 8 upcoming forecast periods.
Forecast Details
- Last updated
- May 24, 2026 11:59 AM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- DMX
- Radar station
- KDMX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Partly cloudy, with a low around 62.
A chance of showers and thunderstorms after 7am. Mostly sunny, with a high near 84. Chance of precipitation is 40%.
A chance of showers and thunderstorms. Partly cloudy, with a low around 62. Chance of precipitation is 40%.
A chance of showers and thunderstorms. Partly sunny, with a high near 82. Chance of precipitation is 40%.
A chance of showers and thunderstorms before 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 61. Chance of precipitation is 40%.
A chance of showers and thunderstorms. Partly sunny, with a high near 78. Chance of precipitation is 30%.
A chance of showers and thunderstorms before 7pm, then a slight chance of showers and thunderstorms. Mostly cloudy, with a low around 57. Chance of precipitation is 30%.
A slight chance of showers and thunderstorms. Mostly sunny, with a high near 78.
A slight chance of showers and thunderstorms before 7pm. Partly cloudy, with a low around 56.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
May 26
|
Sunny
|
86°F |
3 to 8 mph
SSE
|
|
Tuesday Night
May 26
|
Partly Cloudy
|
62°F |
2 to 7 mph
ESE
|
|
Wednesday
May 27
|
Chance Showers And Thunderstorms
|
84°F |
2 to 9 mph
E
|
|
Wednesday Night
May 27
|
Chance Showers And Thunderstorms
|
62°F |
5 to 9 mph
E
|
|
Thursday
May 28
|
Chance Showers And Thunderstorms
|
82°F |
6 to 9 mph
E
|
|
Thursday Night
May 28
|
Chance Showers And Thunderstorms
|
61°F |
5 to 8 mph
E
|
|
Friday
May 29
|
Chance Showers And Thunderstorms
|
78°F |
6 to 9 mph
E
|
|
Friday Night
May 29
|
Chance Showers And Thunderstorms then Slight Chance Showers And Thunderstorms
|
57°F |
5 to 8 mph
E
|
|
Saturday
May 30
|
Slight Chance Showers And Thunderstorms
|
78°F |
5 to 9 mph
E
|
|
Saturday Night
May 30
|
Slight Chance Showers And Thunderstorms then Partly Cloudy
|
56°F |
3 to 9 mph
ESE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Johnston.
