Castalia, IA Weather Forecast
Local 7-day forecast
Slight Chance Snow Showers
Track current conditions, temperature changes, wind, and the full daily outlook for Castalia, IA in one place.
A slight chance of rain showers before 10am, then a slight chance of snow showers between 10am and 1pm. Mostly sunny, with a high near 44. Northwest wind 15 to 18 mph, with gusts as high as 26 mph. Chance of precipitation is 20%. New rainfall amounts less than a tenth of an inch possible.
Local Weather Overview
This forecast page for Castalia, 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: Apr 16, 2026 9:44 AM CDT.
The active forecast window currently covers Apr 18 to Apr 22, 2026 for Castalia, IA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 18 to Apr 22, 2026
- Latest sync
- Apr 16, 2026 9:44 AM CDT
- Forecast office
- ARX
- Source
- NOAA / NWS
Daily Outlook
This Week in Castalia
Tuesday looks like the warmest upcoming period in Castalia at 70 degrees F.
Saturday Night is the coolest period ahead with temperatures near 28 degrees F.
The strongest winds are forecast for Saturday at about 15 to 18 mph NW.
Precipitation is mentioned in 2 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 16, 2026 9:44 AM CDT
- Coverage
- 5 days
- Time zone
- America/Chicago
- Forecast office
- ARX
- Radar station
- KARX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Mostly clear, with a low around 28. Northwest wind 7 to 16 mph, with gusts as high as 24 mph.
Sunny, with a high near 50. Northwest wind 7 to 14 mph.
Mostly clear, with a low around 30. Northeast wind 5 to 9 mph.
Sunny, with a high near 60. Southeast wind 5 to 14 mph.
Partly cloudy, with a low around 46. South wind around 13 mph, with gusts as high as 22 mph.
Sunny, with a high near 70. Southwest wind around 13 mph, with gusts as high as 21 mph.
Mostly clear, with a low around 46. Southwest wind 7 to 10 mph, with gusts as high as 18 mph.
Sunny, with a high near 67. South wind 7 to 12 mph.
A chance of rain showers after 7pm. Partly cloudy, with a low around 47. Southeast wind around 10 mph, with gusts as high as 18 mph. Chance of precipitation is 40%.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 18
|
Slight Chance Snow Showers
|
44°F |
15 to 18 mph
NW
|
|
Saturday Night
Apr 18
|
Mostly Clear
|
28°F |
7 to 16 mph
NW
|
|
Sunday
Apr 19
|
Sunny
|
50°F |
7 to 14 mph
NW
|
|
Sunday Night
Apr 19
|
Mostly Clear
|
30°F |
5 to 9 mph
NE
|
|
Monday
Apr 20
|
Sunny
|
60°F |
5 to 14 mph
SE
|
|
Monday Night
Apr 20
|
Partly Cloudy
|
46°F |
13 mph
S
|
|
Tuesday
Apr 21
|
Sunny
|
70°F |
13 mph
SW
|
|
Tuesday Night
Apr 21
|
Mostly Clear
|
46°F |
7 to 10 mph
SW
|
|
Wednesday
Apr 22
|
Sunny
|
67°F |
7 to 12 mph
S
|
|
Wednesday Night
Apr 22
|
Chance Rain Showers
|
47°F |
10 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Castalia.