Saint Marys, IA Weather Forecast
Local 7-day forecast
Sunny
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Marys, IA in one place.
Sunny, with a high near 94. Heat index values as high as 101. West wind around 8 mph.
Local Weather Overview
This forecast page for Saint Marys, 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: Jul 17, 2026 3:37 PM CDT.
The active forecast window currently covers Jul 18 to Jul 23, 2026 for Saint Marys, IA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Jul 18 to Jul 23, 2026
- Latest sync
- Jul 17, 2026 3:37 PM CDT
- Forecast office
- DMX
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Marys
Monday looks like the warmest upcoming period in Saint Marys at 98 degrees F.
Tuesday Night is the coolest period ahead with temperatures near 63 degrees F.
The strongest winds are forecast for Tuesday at about 10 to 17 mph NNW.
Precipitation is mentioned in 5 upcoming forecast periods.
Forecast Details
- Last updated
- Jul 17, 2026 3:37 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
Partly cloudy, with a low around 69. Northeast wind 3 to 9 mph.
Sunny, with a high near 92. East southeast wind around 5 mph.
Mostly clear, with a low around 74.
Sunny, with a high near 98.
A slight chance of showers and thunderstorms after 7pm. Mostly clear, with a low around 74. Chance of precipitation is 20%.
A slight chance of showers and thunderstorms before 7am. Sunny, with a high near 89.
Mostly clear, with a low around 63.
Sunny, with a high near 84.
A slight chance of showers and thunderstorms after 1am. Partly cloudy, with a low around 63.
A slight chance of showers and thunderstorms before 1pm. Mostly sunny, with a high near 85.
A slight chance of showers and thunderstorms between 7pm and 1am, then a chance of showers and thunderstorms. Partly cloudy, with a low around 63.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Jul 18
|
Sunny
|
94°F |
8 mph
W
|
|
Saturday Night
Jul 18
|
Partly Cloudy
|
69°F |
3 to 9 mph
NE
|
|
Sunday
Jul 19
|
Sunny
|
92°F |
5 mph
ESE
|
|
Sunday Night
Jul 19
|
Mostly Clear
|
74°F |
8 mph
SSE
|
|
Monday
Jul 20
|
Sunny
|
98°F |
8 to 13 mph
SW
|
|
Monday Night
Jul 20
|
Slight Chance Showers And Thunderstorms
|
74°F |
12 mph
W
|
|
Tuesday
Jul 21
|
Slight Chance Showers And Thunderstorms then Sunny
|
89°F |
10 to 17 mph
NNW
|
|
Tuesday Night
Jul 21
|
Mostly Clear
|
63°F |
6 to 16 mph
N
|
|
Wednesday
Jul 22
|
Sunny
|
84°F |
5 to 9 mph
N
|
|
Wednesday Night
Jul 22
|
Partly Cloudy then Slight Chance Showers And Thunderstorms
|
63°F |
2 to 9 mph
ESE
|
|
Thursday
Jul 23
|
Slight Chance Showers And Thunderstorms
|
85°F |
3 to 7 mph
SSW
|
|
Thursday Night
Jul 23
|
Slight Chance Showers And Thunderstorms
|
63°F |
5 to 8 mph
SSE
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Marys.