Johnston, IA Weather Forecast
Local 7-day forecast
Slight Chance Showers And Thunderstorms then Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Johnston, IA in one place.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 82. South southeast wind 6 to 12 mph, with gusts as high as 20 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
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: Oct 8, 2026 12:17 PM CDT.
The active forecast window currently covers Oct 9 to Oct 14, 2026 for Johnston, IA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Oct 9 to Oct 14, 2026
- Latest sync
- Oct 8, 2026 12:17 PM CDT
- Forecast office
- DMX
- Source
- NOAA / NWS
Daily Outlook
This Week in Johnston
Friday looks like the warmest upcoming period in Johnston at 82 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 50 degrees F.
The strongest winds are forecast for Saturday at about 10 to 14 mph S.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 8, 2026 12:17 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
Clear, with a low around 66. South wind around 10 mph, with gusts as high as 18 mph.
Sunny, with a high near 81. South wind 10 to 14 mph, with gusts as high as 23 mph.
Clear, with a low around 61.
Sunny, with a high near 79.
Partly cloudy, with a low around 63.
A slight chance of rain showers after 1pm. Mostly sunny, with a high near 76.
A slight chance of rain showers before 1am. Partly cloudy, with a low around 53.
Mostly sunny, with a high near 65.
A slight chance of rain showers after 1am. Partly cloudy, with a low around 50.
A chance of rain showers. Mostly sunny, with a high near 65. Chance of precipitation is 30%.
A chance of rain showers. Partly cloudy, with a low around 54.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Oct 9
|
Slight Chance Showers And Thunderstorms then Sunny
|
82°F |
6 to 12 mph
SSE
|
|
Friday Night
Oct 9
|
Clear
|
66°F |
10 mph
S
|
|
Saturday
Oct 10
|
Sunny
|
81°F |
10 to 14 mph
S
|
|
Saturday Night
Oct 10
|
Clear
|
61°F |
8 to 12 mph
S
|
|
Sunday
Oct 11
|
Sunny
|
79°F |
9 mph
S
|
|
Sunday Night
Oct 11
|
Partly Cloudy
|
63°F |
8 mph
S
|
|
Columbus Day
Oct 12
|
Mostly Sunny then Slight Chance Rain Showers
|
76°F |
6 to 10 mph
WSW
|
|
Monday Night
Oct 12
|
Slight Chance Rain Showers
|
53°F |
10 mph
NNW
|
|
Tuesday
Oct 13
|
Mostly Sunny
|
65°F |
6 to 9 mph
N
|
|
Tuesday Night
Oct 13
|
Partly Cloudy then Slight Chance Rain Showers
|
50°F |
6 mph
NE
|
|
Wednesday
Oct 14
|
Chance Rain Showers
|
65°F |
5 to 9 mph
SE
|
|
Wednesday Night
Oct 14
|
Chance Rain Showers
|
54°F |
9 mph
S
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Johnston.
