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As of 16:03 CST

Weather in St. Marys, IA

48°Current weather

St. Marys, Wednesday, 4 November, 16:03

Overcast. Feels like 46°. High 51°, low 46°.

Pressure29.71 inHg
Wind5 mph SW
Humidity91%
Visibility6.2 mi
Dew point45°
Thu, 0552° / 46°0.01Light rain
52 °Light rain

St. Marys, Thursday, 5 November

Light rain. High 52°, low 46°.

Pressure29.91 inHg
Wind13.2 mph NW
Humidity60%
Visibility6.2 mi
Dew point39°
Fri, 0650° / 38°0Overcast
50 °Overcast

St. Marys, Friday, 6 November

Overcast. High 50°, low 38°.

Pressure30.27 inHg
Wind5.7 mph N
Humidity55%
Visibility6.2 mi
Dew point34°
Sat, 0756° / 34°0Partly cloudy
56 °Partly cloudy

St. Marys, Saturday, 7 November

Partly cloudy. High 56°, low 34°.

Pressure30.24 inHg
Wind7.5 mph SW
Humidity53%
Visibility6.2 mi
Dew point37°
Sun, 0862° / 44°0Clear
62 °Clear

St. Marys, Sunday, 8 November

Clear. High 62°, low 44°.

Pressure30.15 inHg
Wind5.9 mph NW
Humidity59%
Visibility6.2 mi
Dew point46°
Mon, 0968° / 42°0Clear
68 °Clear

St. Marys, Monday, 9 November

Clear. High 68°, low 42°.

Pressure30.06 inHg
Wind10 mph SW
Humidity58%
Visibility—
Dew point48°
Tue, 1058° / 44°0Clear
58 °Clear

St. Marys, Tuesday, 10 November

Clear. High 58°, low 44°.

Pressure30.09 inHg
Wind7.8 mph NW
Humidity45%
Visibility—
Dew point34°
Wed, 1149° / 39°0Overcast
49 °Overcast

St. Marys, Wednesday, 11 November

Overcast. High 49°, low 39°.

Pressure30.21 inHg
Wind11.1 mph N
Humidity53%
Visibility—
Dew point31°
Thu, 1246° / 33°0Mostly clear
46 °Mostly clear

St. Marys, Thursday, 12 November

Mostly clear. High 46°, low 33°.

Pressure30.27 inHg
Wind8.8 mph NW
Humidity57%
Visibility—
Dew point28°
Fri, 1356° / 35°0Overcast
56 °Overcast

St. Marys, Friday, 13 November

Overcast. High 56°, low 35°.

Pressure29.80 inHg
Wind7.7 mph SW
Humidity55%
Visibility—
Dew point34°
Sat, 1446° / 34°0Clear
46 °Clear

St. Marys, Saturday, 14 November

Clear. High 46°, low 34°.

Pressure30.00 inHg
Wind7.7 mph NE
Humidity57%
Visibility—
Dew point30°
Sun, 1544° / 30°0Clear
44 °Clear

St. Marys, Sunday, 15 November

Clear. High 44°, low 30°.

Pressure30.30 inHg
Wind5.9 mph NE
Humidity54%
Visibility—
Dew point25°
Mon, 1647° / 30°0Clear
47 °Clear

St. Marys, Monday, 16 November

Clear. High 47°, low 30°.

Pressure30.39 inHg
Wind5.9 mph S
Humidity47%
Visibility—
Dew point24°
Tue, 1750° / 31°0Mostly clear
50 °Mostly clear

St. Marys, Tuesday, 17 November

Mostly clear. High 50°, low 31°.

Pressure30.30 inHg
Wind11.9 mph S
Humidity45%
Visibility—
Dew point25°
Wed, 1849° / 36°0Overcast
49 °Overcast

St. Marys, Wednesday, 18 November

Overcast. High 49°, low 36°.

Pressure30.15 inHg
Wind14.3 mph S
Humidity48%
Visibility—
Dew point29°
Thu, 1946° / 38°0Overcast
46 °Overcast

St. Marys, Thursday, 19 November

Overcast. High 46°, low 38°.

Pressure30.24 inHg
Wind13.9 mph W
Humidity60%
Visibility—
Dew point32°

About the monthly outlook

How accurate is a 30-day forecast?

The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for St. Marys, IA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.

What does "above normal" mean?

We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.

Where do the 66-year records come from?

They are real temperature extremes recorded in St. Marys, IA since 1960: the highest and lowest reading for each calendar date, with the year it happened.

How often is it updated?

The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.