Johnson County, IA Weather Forecast
County weather hub
Sunny then Slight Chance Showers And Thunderstorms
Compare major city weather across Johnson County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
A slight chance of rain showers between 3pm and 4pm, then a slight chance of showers and thunderstorms. Sunny, with a high near 82. Northwest wind around 5 mph. Chance of precipitation is 20%.
County Weather Overview
This county weather page brings together forecast coverage for Johnson County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 6 of 6 mapped cities in Johnson County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Oct 13 to Oct 18, 2026
- Latest sync
- Oct 12, 2026 10:07 AM CDT
- Forecast office
- DVN
- Source
- NOAA / NWS
Daily Outlook
This Week in Johnson County
Tuesday looks like the warmest upcoming period in Johnson County at 82 degrees F.
Friday Night is the coolest period ahead with temperatures near 37 degrees F.
The strongest winds are forecast for Friday at about 15 to 25 mph NW.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 12, 2026 10:07 AM CDT
- Coverage
- 6 days
- Time zone
- America/Chicago
- Forecast office
- DVN
- Radar station
- KDVN
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
A slight chance of showers and thunderstorms before 7pm, then showers and thunderstorms. Mostly cloudy, with a low around 61. North wind around 5 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
Rain showers. Mostly cloudy, with a high near 71. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
A slight chance of rain showers before 7pm, then a chance of showers and thunderstorms. Mostly cloudy, with a low around 56. Chance of precipitation is 50%.
Showers and thunderstorms. Mostly cloudy, with a high near 68. Chance of precipitation is 80%.
Rain showers likely before 1am. Mostly cloudy, with a low around 48. Chance of precipitation is 60%.
Mostly sunny, with a high near 58.
Mostly clear, with a low around 37.
Sunny, with a high near 58.
Clear, with a low around 40.
Sunny, with a high near 65.
Partly cloudy, with a low around 47.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Tuesday
Oct 13
|
Sunny then Slight Chance Showers And Thunderstorms
|
82°F |
5 mph
NW
|
|
Tuesday Night
Oct 13
|
Slight Chance Showers And Thunderstorms then Showers And Thunderstorms
|
61°F |
5 mph
N
|
|
Wednesday
Oct 14
|
Rain Showers
|
71°F |
5 to 10 mph
NE
|
|
Wednesday Night
Oct 14
|
Chance Showers And Thunderstorms
|
56°F |
5 to 10 mph
NE
|
|
Thursday
Oct 15
|
Showers And Thunderstorms
|
68°F |
10 mph
NE
|
|
Thursday Night
Oct 15
|
Rain Showers Likely
|
48°F |
10 to 20 mph
NW
|
|
Friday
Oct 16
|
Mostly Sunny
|
58°F |
15 to 25 mph
NW
|
|
Friday Night
Oct 16
|
Mostly Clear
|
37°F |
0 to 15 mph
N
|
|
Saturday
Oct 17
|
Sunny
|
58°F |
0 to 10 mph
SW
|
|
Saturday Night
Oct 17
|
Clear
|
40°F |
5 to 10 mph
S
|
|
Sunday
Oct 18
|
Sunny
|
65°F |
10 to 15 mph
S
|
|
Sunday Night
Oct 18
|
Partly Cloudy
|
47°F |
5 to 10 mph
S
|
Major City Forecasts
Live forecast snapshots for major cities across Johnson County.
Coverage
Forecast coverage currently spans 6 of 6 mapped cities in Johnson County.
Largest mapped city population in this region: 75,130.
