Coster, IA Weather Forecast
Local 7-day forecast
Areas Of Fog
Track current conditions, temperature changes, wind, and the full daily outlook for Coster, IA in one place.
Areas of fog and a chance of showers and thunderstorms before 1pm. Cloudy, with a high near 73. Northeast wind around 5 mph. Chance of precipitation is 50%. New rainfall amounts between a tenth and quarter of an inch possible.
Local Weather Overview
This forecast page for Coster, 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: Sep 17, 2026 8:24 AM CDT.
The active forecast window currently covers Sep 17 to Sep 23, 2026 for Coster, IA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Sep 17 to Sep 23, 2026
- Latest sync
- Sep 17, 2026 8:24 AM CDT
- Forecast office
- DMX
- Source
- NOAA / NWS
Daily Outlook
This Week in Coster
Saturday looks like the warmest upcoming period in Coster at 78 degrees F.
Monday Night is the coolest period ahead with temperatures near 50 degrees F.
The strongest winds are forecast for Friday at about 8 to 16 mph ESE.
Precipitation is mentioned in 12 upcoming forecast periods.
Forecast Details
- Last updated
- Sep 17, 2026 8:24 AM CDT
- Coverage
- 7 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
A chance of rain showers after 1am. Mostly cloudy. Low around 60, with temperatures rising to around 62 overnight. East northeast wind around 7 mph. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers before 7am, then showers and thunderstorms between 7am and 11am, then a chance of showers and thunderstorms. Cloudy. High near 74, with temperatures falling to around 72 in the afternoon. East southeast wind 8 to 16 mph, with gusts as high as 23 mph. Chance of precipitation is 80%. New rainfall amounts between a half and three quarters of an inch possible.
A chance of showers and thunderstorms before 7pm, then showers and thunderstorms. Mostly cloudy. Low around 66, with temperatures rising to around 68 overnight. Southeast wind 9 to 15 mph, with gusts as high as 21 mph. Chance of precipitation is 90%. New rainfall amounts between three quarters and one inch possible.
Showers and thunderstorms. Mostly cloudy, with a high near 78. West wind around 10 mph. Chance of precipitation is 90%. New rainfall amounts between a half and three quarters of an inch possible.
A chance of showers and thunderstorms. Mostly cloudy, with a low around 58. Chance of precipitation is 40%. New rainfall amounts less than a tenth of an inch possible.
A chance of rain showers. Mostly cloudy, with a high near 65. Chance of precipitation is 40%.
A chance of rain showers. Mostly cloudy, with a low around 53. Chance of precipitation is 50%.
A chance of rain showers. Mostly cloudy, with a high near 62. Chance of precipitation is 50%.
A chance of rain showers. Mostly cloudy, with a low around 50. Chance of precipitation is 40%.
A chance of rain showers before 1pm. Mostly cloudy, with a high near 64. Chance of precipitation is 30%.
Mostly cloudy, with a low around 50.
Partly sunny, with a high near 70.
A slight chance of showers and thunderstorms after 1am. Mostly cloudy, with a low around 54.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Today
Sep 17
|
Areas Of Fog
|
73°F |
5 mph
NE
|
|
Tonight
Sep 17
|
Mostly Cloudy then Chance Rain Showers
|
60°F |
7 mph
ENE
|
|
Friday
Sep 18
|
Showers And Thunderstorms then Chance Showers And Thunderstorms
|
74°F |
8 to 16 mph
ESE
|
|
Friday Night
Sep 18
|
Chance Showers And Thunderstorms then Showers And Thunderstorms
|
66°F |
9 to 15 mph
SE
|
|
Saturday
Sep 19
|
Showers And Thunderstorms
|
78°F |
10 mph
W
|
|
Saturday Night
Sep 19
|
Chance Showers And Thunderstorms
|
58°F |
9 mph
N
|
|
Sunday
Sep 20
|
Chance Rain Showers
|
65°F |
10 to 14 mph
NE
|
|
Sunday Night
Sep 20
|
Chance Rain Showers
|
53°F |
13 mph
ENE
|
|
Monday
Sep 21
|
Chance Rain Showers
|
62°F |
12 mph
ENE
|
|
Monday Night
Sep 21
|
Chance Rain Showers
|
50°F |
7 to 10 mph
ENE
|
|
Tuesday
Sep 22
|
Chance Rain Showers
|
64°F |
8 mph
ENE
|
|
Tuesday Night
Sep 22
|
Mostly Cloudy
|
50°F |
2 to 6 mph
E
|
|
Wednesday
Sep 23
|
Partly Sunny
|
70°F |
2 to 6 mph
SE
|
|
Wednesday Night
Sep 23
|
Mostly Cloudy then Slight Chance Showers And Thunderstorms
|
54°F |
3 mph
SE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Coster.