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As of 08:00 CDT

Weather in St. Marys, IA

54°Current weather

St. Marys, Thursday, 22 October, 08:00

Clear. Feels like 53°. High 77°, low 52°.

Pressure30.21 inHg
Wind1 mph SW
Humidity88%
Visibility6.2 mi
Dew point50°
Fri, 2375° / 53°0Mostly clear
75 °Mostly clear

St. Marys, Friday, 23 October

Mostly clear. High 75°, low 53°.

Pressure30.18 inHg
Wind9.8 mph S
Humidity51%
Visibility6.2 mi
Dew point51°
Sat, 2476° / 59°0Clear
76 °Clear

St. Marys, Saturday, 24 October

Clear. High 76°, low 59°.

Pressure30.24 inHg
Wind11.5 mph S
Humidity50%
Visibility6.2 mi
Dew point51°
Sun, 2576° / 55°0Overcast
76 °Overcast

St. Marys, Sunday, 25 October

Overcast. High 76°, low 55°.

Pressure30.33 inHg
Wind2.4 mph SW
Humidity61%
Visibility6.2 mi
Dew point56°
Mon, 2673° / 55°0Overcast
73 °Overcast

St. Marys, Monday, 26 October

Overcast. High 73°, low 55°.

Pressure30.30 inHg
Wind6.9 mph SE
Humidity57%
Visibility—
Dew point53°
Tue, 2769° / 54°0.06Light rain
69 °Light rain

St. Marys, Tuesday, 27 October

Light rain. High 69°, low 54°.

Pressure30.18 inHg
Wind11 mph S
Humidity57%
Visibility—
Dew point49°
Wed, 2861° / 48°0Overcast
61 °Overcast

St. Marys, Wednesday, 28 October

Overcast. High 61°, low 48°.

Pressure30.18 inHg
Wind7.5 mph W
Humidity65%
Visibility—
Dew point45°
Thu, 2956° / 52°1.41Heavy rain
56 °Heavy rain

St. Marys, Thursday, 29 October

Heavy rain. High 56°, low 52°.

Pressure30.03 inHg
Wind11.3 mph SE
Humidity92%
Visibility—
Dew point51°
Fri, 3063° / 57°0.24Rain
63 °Rain

St. Marys, Friday, 30 October

Rain. High 63°, low 57°.

Pressure29.77 inHg
Wind9.9 mph SE
Humidity89%
Visibility—
Dew point58°
Sat, 3163° / 52°0.01Light rain
63 °Light rain

St. Marys, Saturday, 31 October

Light rain. High 63°, low 52°.

Pressure29.80 inHg
Wind7.6 mph W
Humidity60%
Visibility—
Dew point46°
Sun, 0163° / 47°0Clear
63 °Clear

St. Marys, Sunday, 1 November

Clear. High 63°, low 47°.

Pressure30.00 inHg
Wind10.3 mph N
Humidity44%
Visibility—
Dew point38°
Mon, 0257° / 43°0Mostly clear
57 °Mostly clear

St. Marys, Monday, 2 November

Mostly clear. High 57°, low 43°.

Pressure30.27 inHg
Wind11 mph NE
Humidity46%
Visibility—
Dew point34°
Tue, 0354° / 39°0Overcast
54 °Overcast

St. Marys, Tuesday, 3 November

Overcast. High 54°, low 39°.

Pressure30.42 inHg
Wind7.2 mph E
Humidity48%
Visibility—
Dew point32°
Wed, 0453° / 37°0Overcast
53 °Overcast

St. Marys, Wednesday, 4 November

Overcast. High 53°, low 37°.

Pressure30.42 inHg
Wind10.7 mph E
Humidity54%
Visibility—
Dew point33°
Thu, 0553° / 36°0Mostly clear
53 °Mostly clear

St. Marys, Thursday, 5 November

Mostly clear. High 53°, low 36°.

Pressure30.30 inHg
Wind10.6 mph E
Humidity54%
Visibility—
Dew point33°
Fri, 0659° / 45°0Partly cloudy
59 °Partly cloudy

St. Marys, Friday, 6 November

Partly cloudy. High 59°, low 45°.

Pressure30.21 inHg
Wind4.9 mph N
Humidity63%
Visibility—
Dew point42°

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.