As of 06:48 CST

Weather in St. Marys, IA

48°

St. Marys, Thursday, 5 November, 06:48

Overcast. Feels like 47°. High 51°, low 47°.

Pressure29.80 inHg

Wind3 mph NW

Humidity99%

Visibility6.2 mi

Dew point47°

See detailed hourly forecast

Fri, 0649° / 38°

49 °

St. Marys, Friday, 6 November

Partly cloudy. High 49°, low 38°.

Pressure30.27 inHg

Wind4.4 mph N

Humidity55%

Visibility6.2 mi

Dew point34°

Sat, 0756° / 34°

56 °

St. Marys, Saturday, 7 November

Partly cloudy. High 56°, low 34°.

Pressure30.24 inHg

Wind6.6 mph SW

Humidity57%

Visibility6.2 mi

Dew point38°

Sun, 0864° / 43°

64 °

St. Marys, Sunday, 8 November

Clear. High 64°, low 43°.

Pressure30.15 inHg

Wind3.5 mph NW

Humidity61%

Visibility6.2 mi

Dew point47°

Mon, 0967° / 44°

67 °

St. Marys, Monday, 9 November

Partly cloudy. High 67°, low 44°.

Pressure30.06 inHg

Wind11.3 mph SW

Humidity58%

Visibility—

Dew point47°

Tue, 1059° / 42°

59 °

St. Marys, Tuesday, 10 November

Partly cloudy. High 59°, low 42°.

Pressure30.12 inHg

Wind7.2 mph NW

Humidity52%

Visibility—

Dew point37°

Wed, 1152° / 39°

52 °

St. Marys, Wednesday, 11 November

Clear. High 52°, low 39°.

Pressure30.24 inHg

Wind12 mph N

Humidity36%

Visibility—

Dew point25°

Thu, 1251° / 34°

51 °

St. Marys, Thursday, 12 November

Clear. High 51°, low 34°.

Pressure30.21 inHg

Wind7.2 mph SW

Humidity48%

Visibility—

Dew point27°

Fri, 1359° / 40°

59 °

St. Marys, Friday, 13 November

Clear. High 59°, low 40°.

Pressure29.85 inHg

Wind8.7 mph SW

Humidity58%

Visibility—

Dew point40°

Sat, 1461° / 43°

61 °

St. Marys, Saturday, 14 November

Clear. High 61°, low 43°.

Pressure29.94 inHg

Wind6.4 mph SW

Humidity54%

Visibility—

Dew point40°

Sun, 1559° / 44°

59 °

St. Marys, Sunday, 15 November

Overcast. High 59°, low 44°.

Pressure29.94 inHg

Wind12 mph S

Humidity64%

Visibility—

Dew point43°

Mon, 1669° / 58°

69 °

St. Marys, Monday, 16 November

Overcast. High 69°, low 58°.

Pressure29.71 inHg

Wind15.4 mph S

Humidity73%

Visibility—

Dew point58°

Tue, 1762° / 51°

62 °

St. Marys, Tuesday, 17 November

Clear. High 62°, low 51°.

Pressure29.85 inHg

Wind15.5 mph W

Humidity48%

Visibility—

Dew point41°

Wed, 1852° / 44°

52 °

St. Marys, Wednesday, 18 November

Overcast. High 52°, low 44°.

Pressure30.09 inHg

Wind9.8 mph NW

Humidity51%

Visibility—

Dew point34°

Thu, 1945° / 34°

45 °

St. Marys, Thursday, 19 November

Partly cloudy. High 45°, low 34°.

Pressure30.24 inHg

Wind8.5 mph NW

Humidity49%

Visibility—

Dew point24°

Fri, 2047° / 35°

47 °

St. Marys, Friday, 20 November

Overcast. High 47°, low 35°.

Pressure30.15 inHg

Wind12.5 mph NW

Humidity49%

Visibility—

Dew point27°

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.