O Brien County, IA Weather Forecast
County weather hub
Mostly Cloudy
Compare major city weather across O'Brien County, scan the latest forecast snapshots, and jump into local 7-day outlook pages from one hub.
Mostly cloudy, with a high near 50. North northwest wind 15 to 30 mph, with gusts as high as 40 mph.
County Weather Overview
This county weather page brings together forecast coverage for O'Brien County so visitors can compare temperatures, wind, and conditions across the region without hopping between unrelated pages.
Current forecast coverage spans 3 of 3 mapped cities in O'Brien County.
Page Snapshot
- Page focus
- county weather
- Forecast window
- Oct 16 to Oct 22, 2026
- Latest sync
- Oct 15, 2026 10:54 PM CDT
- Forecast office
- FSD
- Source
- NOAA / NWS
Daily Outlook
This Week in O'Brien County
Wednesday looks like the warmest upcoming period in O'Brien County at 73 degrees F.
Friday Night is the coolest period ahead with temperatures near 30 degrees F.
The strongest winds are forecast for Friday at about 15 to 30 mph NNW.
Precipitation is mentioned in 3 upcoming forecast periods.
Forecast Details
- Last updated
- Oct 15, 2026 10:54 PM CDT
- Coverage
- 7 days
- Time zone
- America/Chicago
- Forecast office
- FSD
- Radar station
- KFSD
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Widespread frost after 9pm. Clear, with a low around 30. Northwest wind 0 to 10 mph.
Widespread frost before 8am. Sunny, with a high near 58. South southwest wind 5 to 20 mph, with gusts as high as 30 mph.
Clear, with a low around 40. South southwest wind around 15 mph, with gusts as high as 25 mph.
Sunny, with a high near 66. South southwest wind 15 to 20 mph, with gusts as high as 25 mph.
Mostly clear, with a low around 43.
Mostly sunny, with a high near 66.
Partly cloudy, with a low around 46.
Sunny, with a high near 71.
Mostly clear, with a low around 52.
A slight chance of rain showers after 1pm. Mostly sunny, with a high near 73.
A slight chance of rain showers. Partly cloudy, with a low around 55.
A chance of rain showers. Partly sunny, with a high near 73. Chance of precipitation is 30%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Friday
Oct 16
|
Mostly Cloudy
|
50°F |
15 to 30 mph
NNW
|
|
Friday Night
Oct 16
|
Widespread Frost
|
30°F |
0 to 10 mph
NW
|
|
Saturday
Oct 17
|
Widespread Frost then Sunny
|
58°F |
5 to 20 mph
SSW
|
|
Saturday Night
Oct 17
|
Clear
|
40°F |
15 mph
SSW
|
|
Sunday
Oct 18
|
Sunny
|
66°F |
15 to 20 mph
SSW
|
|
Sunday Night
Oct 18
|
Mostly Clear
|
43°F |
5 to 10 mph
S
|
|
Monday
Oct 19
|
Mostly Sunny
|
66°F |
5 mph
SSE
|
|
Monday Night
Oct 19
|
Partly Cloudy
|
46°F |
5 mph
SSE
|
|
Tuesday
Oct 20
|
Sunny
|
71°F |
5 to 15 mph
SSE
|
|
Tuesday Night
Oct 20
|
Mostly Clear
|
52°F |
10 mph
SSE
|
|
Wednesday
Oct 21
|
Mostly Sunny then Slight Chance Rain Showers
|
73°F |
10 to 15 mph
SSE
|
|
Wednesday Night
Oct 21
|
Slight Chance Rain Showers
|
55°F |
10 mph
S
|
|
Thursday
Oct 22
|
Chance Rain Showers
|
73°F |
10 to 15 mph
S
|
Major City Forecasts
Live forecast snapshots for major cities across O'Brien County.
Coverage
Forecast coverage currently spans 3 of 3 mapped cities in O'Brien County.
Largest mapped city population in this region: 5,071.
