Johnston, IA Weather Forecast
Local 7-day forecast
Chance Rain Showers then Mostly Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Johnston, IA in one place.
A chance of rain showers before 8am. Mostly sunny. High near 81, with temperatures falling to around 79 in the afternoon. Southeast wind 2 to 6 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: Aug 23, 2026 6:54 PM CDT.
The active forecast window currently covers Aug 24 to Aug 29, 2026 for Johnston, IA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Aug 24 to Aug 29, 2026
- Latest sync
- Aug 23, 2026 6:54 PM CDT
- Forecast office
- DMX
- Source
- NOAA / NWS
Daily Outlook
This Week in Johnston
Tuesday looks like the warmest upcoming period in Johnston at 84 degrees F.
Thursday Night is the coolest period ahead with temperatures near 63 degrees F.
The strongest winds are forecast for Wednesday at about 5 to 12 mph WNW.
Precipitation is mentioned in 7 upcoming forecast periods.
Forecast Details
- Last updated
- Aug 23, 2026 6:54 PM CDT
- Coverage
- 6 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 65. Southeast wind around 6 mph.
Mostly sunny, with a high near 84. South wind around 5 mph.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 68. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 84. Chance of precipitation is 20%.
Mostly clear, with a low around 64.
Sunny, with a high near 83.
Mostly clear, with a low around 63.
A slight chance of rain showers between 7am and 1pm. Mostly sunny, with a high near 84.
A slight chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 66. Chance of precipitation is 50%.
A chance of showers and thunderstorms before 7am, then a chance of showers and thunderstorms between 7am and 1pm. Partly sunny, with a high near 84. Chance of precipitation is 50%.
A chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 69.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Monday
Aug 24
|
Chance Rain Showers then Mostly Sunny
|
81°F |
2 to 6 mph
SE
|
|
Monday Night
Aug 24
|
Partly Cloudy
|
65°F |
6 mph
SE
|
|
Tuesday
Aug 25
|
Mostly Sunny
|
84°F |
5 mph
S
|
|
Tuesday Night
Aug 25
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
68°F |
5 mph
SW
|
|
Wednesday
Aug 26
|
Slight Chance Showers And Thunderstorms then Sunny
|
84°F |
5 to 12 mph
WNW
|
|
Wednesday Night
Aug 26
|
Mostly Clear
|
64°F |
3 to 8 mph
NW
|
|
Thursday
Aug 27
|
Sunny
|
83°F |
6 mph
NNW
|
|
Thursday Night
Aug 27
|
Mostly Clear
|
63°F |
3 mph
S
|
|
Friday
Aug 28
|
Slight Chance Rain Showers
|
84°F |
0 to 5 mph
S
|
|
Friday Night
Aug 28
|
Slight Chance Showers And Thunderstorms
|
66°F |
6 mph
SE
|
|
Saturday
Aug 29
|
Chance Showers And Thunderstorms
|
84°F |
9 mph
SSE
|
|
Saturday Night
Aug 29
|
Chance Showers And Thunderstorms
|
69°F |
8 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Johnston.
