As of 21:00 CST

Weather in St. Marys, IA

41°

St. Marys, Saturday, 7 November, 21:00

Overcast. Feels like 39°. High 53°, low 32°.

Pressure30.12 inHg

Wind3 mph SW

Humidity94%

Visibility6.2 mi

Dew point39°

See detailed hourly forecast

Sun, 0861° / 40°

61 °

St. Marys, Sunday, 8 November

Clear. High 61°, low 40°.

Pressure30.15 inHg

Wind7.4 mph NW

Humidity49%

Visibility6.2 mi

Dew point41°

Mon, 0967° / 38°

67 °

St. Marys, Monday, 9 November

Partly cloudy. High 67°, low 38°.

Pressure30.06 inHg

Wind10.3 mph SW

Humidity57%

Visibility6.2 mi

Dew point48°

Tue, 1060° / 42°

60 °

St. Marys, Tuesday, 10 November

Clear. High 60°, low 42°.

Pressure30.15 inHg

Wind1.8 mph NE

Humidity55%

Visibility6.2 mi

Dew point42°

Wed, 1158° / 42°

58 °

St. Marys, Wednesday, 11 November

Partly cloudy. High 58°, low 42°.

Pressure29.91 inHg

Wind10.5 mph NW

Humidity65%

Visibility6.2 mi

Dew point45°

Thu, 1245° / 37°

45 °

St. Marys, Thursday, 12 November

Overcast. High 45°, low 37°.

Pressure30.12 inHg

Wind13.2 mph N

Humidity60%

Visibility—

Dew point32°

Fri, 1342° / 28°

42 °

St. Marys, Friday, 13 November

Clear. High 42°, low 28°.

Pressure30.24 inHg

Wind6.9 mph NW

Humidity61%

Visibility—

Dew point26°

Sat, 1446° / 28°

46 °

St. Marys, Saturday, 14 November

Overcast. High 46°, low 28°.

Pressure30.15 inHg

Wind7.7 mph SW

Humidity38%

Visibility—

Dew point18°

Sun, 1560° / 36°

60 °

St. Marys, Sunday, 15 November

Clear. High 60°, low 36°.

Pressure30.00 inHg

Wind9.1 mph SW

Humidity59%

Visibility—

Dew point40°

Mon, 1661° / 45°

0.05

61 °

St. Marys, Monday, 16 November

Light rain. High 61°, low 45°.

Pressure29.97 inHg

Wind11.5 mph SE

Humidity62%

Visibility—

Dew point44°

Tue, 1761° / 52°

61 °

St. Marys, Tuesday, 17 November

Light rain. High 61°, low 52°.

Pressure29.88 inHg

Wind9.1 mph S

Humidity83%

Visibility—

Dew point54°

Wed, 1856° / 45°

56 °

St. Marys, Wednesday, 18 November

Clear. High 56°, low 45°.

Pressure29.88 inHg

Wind15.1 mph W

Humidity57%

Visibility—

Dew point38°

Thu, 1962° / 44°

0.03

62 °

St. Marys, Thursday, 19 November

Light rain. High 62°, low 44°.

Pressure29.83 inHg

Wind17.4 mph S

Humidity57%

Visibility—

Dew point41°

Fri, 2061° / 48°

0.06

61 °

St. Marys, Friday, 20 November

Light rain. High 61°, low 48°.

Pressure29.77 inHg

Wind18.7 mph S

Humidity50%

Visibility—

Dew point40°

Sat, 2154° / 43°

54 °

St. Marys, Saturday, 21 November

Overcast. High 54°, low 43°.

Pressure29.83 inHg

Wind13.9 mph SW

Humidity56%

Visibility—

Dew point35°

Sun, 2243° / 37°

43 °

St. Marys, Sunday, 22 November

Overcast. High 43°, low 37°.

Pressure30.03 inHg

Wind16 mph NW

Humidity58%

Visibility—

Dew point29°

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.