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Current weather in St. Marys is clear sky.

Where can I find the hourly weather forecast for St. Marys?

This page shows hourly weather forecast for St. Marys, including temperature, wind, precipitation, humidity and cloud cover.

Is the weather forecast for St. Marys updated regularly?

Weather data for St. Marys is updated regularly with the latest available observations and forecasts.

Now · 11:57 PM

St. Marys Weather & Hourly Forecast

United States · Iowa · 50241

63°F

Clear night

Feels like: 63°F

💧 Humidity 80% 🌡 Pressure 29.97 inHg 💨 Wind 5 mph 👁 Visibility 20.4 mi ☁ Clouds 0% ☀️ UV index 0.0 · Low 🌅 Sunrise — 🌇 Sunset —

Hourly Forecast for St. Marys

Tomorrow

12:00 AM

Clear night

63° 💧 None 💨 5 mph H 80%29.97 inHg

3:00 AM

Clear night

62° 💧 None 💨 6 mph H 87%29.97 inHg

6:00 AM

Clear night

61° 💧 None 💨 5 mph H 93%29.94 inHg

9:00 AM

Sunny

68° 💧 None 💨 6 mph H 88%29.94 inHg

12:00 PM

Mostly sunny

78° 💧 None 💨 9 mph H 68%29.91 inHg

3:00 PM

Partly cloudy

81° 💧 None 💨 12 mph H 62%29.83 inHg

6:00 PM

Partly cloudy

79° 💧 None 💨 10 mph H 67%29.80 inHg

9:00 PM

Partly cloudy night

73° 💧 None 💨 10 mph H 77%29.80 inHg

Saturday

12:00 AM

Mostly cloudy night

70° 💧 None 💨 10 mph H 81%29.80 inHg

3:00 AM

Overcast night

70° 💧 0.006 in 💨 9 mph H 82%29.80 inHg

6:00 AM

Mostly clear night

68° 💧 0.001 in 💨 7 mph H 90%29.83 inHg

9:00 AM

Mostly cloudy

72° 💧 0.000 in 💨 8 mph H 88%29.88 inHg

12:00 PM

Overcast

76° 💧 0.001 in 💨 9 mph H 75%29.94 inHg

3:00 PM

Sunny

79° 💧 None 💨 9 mph H 65%29.91 inHg

6:00 PM

Partly cloudy

77° 💧 None 💨 8 mph H 64%29.94 inHg

9:00 PM

Clear night

68° 💧 None 💨 5 mph H 72%30.00 inHg

Tomorrow

12:00 AM

Clear night

63° 💧 None 💨 5 mph H 80%29.97 inHg

1:00 AM

Clear night

63° 💧 None 💨 5 mph H 82%29.97 inHg

2:00 AM

Clear night

62° 💧 None 💨 6 mph H 85%29.97 inHg

3:00 AM

Clear night

62° 💧 None 💨 6 mph H 87%29.97 inHg

4:00 AM

Clear night

62° 💧 None 💨 6 mph H 90%29.97 inHg

5:00 AM

Clear night

61° 💧 None 💨 6 mph H 92%29.94 inHg

6:00 AM

Clear night

61° 💧 None 💨 5 mph H 93%29.94 inHg

7:00 AM

Sunny

61° 💧 None 💨 5 mph H 95%29.94 inHg

8:00 AM

Sunny

64° 💧 None 💨 7 mph H 93%29.94 inHg

9:00 AM

Sunny

68° 💧 None 💨 6 mph H 88%29.94 inHg

10:00 AM

Sunny

73° 💧 None 💨 7 mph H 83%29.94 inHg

11:00 AM

Mostly sunny

76° 💧 None 💨 8 mph H 75%29.91 inHg

12:00 PM

Mostly sunny

78° 💧 None 💨 9 mph H 68%29.91 inHg

1:00 PM

Mostly sunny

79° 💧 None 💨 10 mph H 65%29.88 inHg

2:00 PM

Mostly cloudy

80° 💧 None 💨 11 mph H 62%29.85 inHg

3:00 PM

Partly cloudy

81° 💧 None 💨 12 mph H 62%29.83 inHg

4:00 PM

Mostly sunny

81° 💧 None 💨 12 mph H 61%29.83 inHg

5:00 PM

Mostly cloudy

80° 💧 None 💨 12 mph H 62%29.80 inHg

6:00 PM

Partly cloudy

79° 💧 None 💨 10 mph H 67%29.80 inHg

7:00 PM

Mostly cloudy

76° 💧 None 💨 9 mph H 72%29.77 inHg

8:00 PM

Mostly cloudy night

74° 💧 None 💨 9 mph H 75%29.77 inHg

9:00 PM

Partly cloudy night

73° 💧 None 💨 10 mph H 77%29.80 inHg

10:00 PM

Mostly cloudy night

71° 💧 None 💨 11 mph H 79%29.80 inHg

11:00 PM

Mostly cloudy night

71° 💧 None 💨 11 mph H 80%29.83 inHg

Saturday

12:00 AM

Mostly cloudy night

70° 💧 None 💨 10 mph H 81%29.80 inHg

1:00 AM

Overcast night

70° 💧 None 💨 9 mph H 82%29.80 inHg

2:00 AM

Overcast night

70° 💧 None 💨 10 mph H 82%29.80 inHg

3:00 AM

Overcast night

70° 💧 None 💨 9 mph H 82%29.80 inHg

4:00 AM

Partly cloudy night

69° 💧 None 💨 6 mph H 85%29.83 inHg

5:00 AM

Light rain

69° 💧 0.006 in 💨 9 mph H 87%29.80 inHg

6:00 AM

Mostly clear night

68° 💧 0.001 in 💨 7 mph H 90%29.83 inHg

7:00 AM

Overcast

68° 💧 None 💨 7 mph H 92%29.83 inHg

8:00 AM

Overcast

70° 💧 None 💨 8 mph H 90%29.85 inHg

9:00 AM

Mostly cloudy

72° 💧 None 💨 8 mph H 88%29.88 inHg

10:00 AM

Mostly cloudy

75° 💧 None 💨 10 mph H 80%29.88 inHg

11:00 AM

Overcast

76° 💧 0.000 in 💨 10 mph H 76%29.91 inHg

12:00 PM

Overcast

76° 💧 0.000 in 💨 9 mph H 75%29.94 inHg

1:00 PM

Mostly sunny

77° 💧 None 💨 8 mph H 73%29.94 inHg

2:00 PM

Mostly sunny

78° 💧 0.000 in 💨 9 mph H 67%29.94 inHg

3:00 PM

Sunny

79° 💧 None 💨 9 mph H 65%29.91 inHg

4:00 PM

Sunny

79° 💧 None 💨 8 mph H 62%29.91 inHg

5:00 PM

Partly cloudy

79° 💧 None 💨 8 mph H 63%29.94 inHg

6:00 PM

Partly cloudy

77° 💧 None 💨 8 mph H 64%29.94 inHg

7:00 PM

Mostly sunny

74° 💧 None 💨 6 mph H 68%29.97 inHg

8:00 PM

Clear night

70° 💧 None 💨 5 mph H 72%29.97 inHg

9:00 PM

Clear night

68° 💧 None 💨 5 mph H 72%30.00 inHg

10:00 PM

Partly cloudy night

67° 💧 None 💨 4 mph H 72%30.00 inHg

11:00 PM

Mostly cloudy night

66° 💧 None 💨 5 mph H 71%30.03 inHg

Sunday

12:00 AM

Mostly cloudy night

65° 💧 None 💨 5 mph H 71%30.03 inHg

1:00 AM

Mostly cloudy night

64° 💧 None 💨 4 mph H 72%30.03 inHg

2:00 AM

Mostly cloudy night

63° 💧 None 💨 4 mph H 74%30.03 inHg

3:00 AM

Mostly cloudy night

62° 💧 None 💨 4 mph H 76%30.03 inHg

4:00 AM

Mostly cloudy night

61° 💧 None 💨 4 mph H 79%30.03 inHg

5:00 AM

Partly cloudy night

60° 💧 None 💨 4 mph H 82%30.03 inHg

6:00 AM

Partly cloudy night

60° 💧 None 💨 5 mph H 85%30.03 inHg

7:00 AM

Partly cloudy

60° 💧 None 💨 5 mph H 87%30.03 inHg

4:00 PM

Light rain

65° 💧 None 💨 12 mph H 94%30.00 inHg

7:00 PM

Light thunderstorms

62° 💧 None 💨 14 mph H 94%30.03 inHg

10:00 PM

Light thunderstorms

58° 💧 None 💨 12 mph H 94%30.06 inHg

Monday

1:00 AM

Moderate rain

58° 💧 None 💨 11 mph H 95%30.06 inHg

4:00 AM

Moderate rain

58° 💧 None 💨 11 mph H 96%30.06 inHg

7:00 AM

Light rain

58° 💧 None 💨 11 mph H 97%30.06 inHg

10:00 AM

Partly cloudy

65° 💧 None 💨 13 mph H 87%30.00 inHg

1:00 PM

Mostly cloudy

78° 💧 None 💨 13 mph H 76%29.88 inHg

4:00 PM

Mostly sunny

87° 💧 None 💨 16 mph H 68%29.80 inHg

7:00 PM

Sunny

84° 💧 None 💨 16 mph H 71%29.77 inHg

10:00 PM

Overcast night

81° 💧 None 💨 16 mph H 67%29.83 inHg

Tuesday

1:00 AM

Partly cloudy night

79° 💧 None 💨 11 mph H 69%29.85 inHg

4:00 AM

Mostly cloudy night

72° 💧 None 💨 6 mph H 91%29.88 inHg

7:00 AM

Moderate rain

70° 💧 None 💨 1 mph H 95%29.97 inHg

10:00 AM

Light rain

73° 💧 None 💨 4 mph H 95%30.00 inHg

1:00 PM

Light rain

73° 💧 None 💨 13 mph H 90%30.03 inHg

4:00 PM

Moderate rain

65° 💧 None 💨 14 mph H 85%30.06 inHg

7:00 PM

Heavy rain

62° 💧 None 💨 10 mph H 95%30.12 inHg

10:00 PM

Heavy rain

60° 💧 None 💨 9 mph H 93%30.21 inHg

Wednesday

1:00 AM

Heavy rain

60° 💧 None 💨 6 mph H 96%30.21 inHg

4:00 AM

Light thunderstorms

60° 💧 None 💨 8 mph H 97%30.21 inHg

7:00 AM

Light rain

59° 💧 None 💨 8 mph H 97%30.24 inHg

10:00 AM

Moderate rain

61° 💧 None 💨 8 mph H 94%30.30 inHg

1:00 PM

Light rain

67° 💧 None 💨 7 mph H 83%30.27 inHg

7:00 PM

Overcast

66° 💧 None 💨 7 mph H 87%30.18 inHg

Thursday

1:00 AM

Mostly cloudy night

69° 💧 None 💨 5 mph H 92%30.09 inHg

7:00 AM

Mostly cloudy

66° 💧 None 💨 4 mph H 99%30.09 inHg

1:00 PM

Moderate rain

68° 💧 None 💨 8 mph H 98%30.12 inHg

7:00 PM

Overcast

79° 💧 None 💨 6 mph H 79%30.15 inHg

Friday

1:00 AM

Partly cloudy night

76° 💧 None 💨 3 mph H 85%30.15 inHg

7:00 AM

Overcast

72° 💧 None 💨 8 mph H 92%30.21 inHg

1:00 PM

Light rain

64° 💧 None 💨 8 mph H 96%30.24 inHg

7:00 PM

Moderate rain

66° 💧 None 💨 6 mph H 96%30.21 inHg

Saturday

1:00 AM

Moderate rain

67° 💧 None 💨 9 mph H 98%30.06 inHg

7:00 AM

Heavy rain

68° 💧 None 💨 18 mph H 98%29.88 inHg

1:00 PM

Overcast

62° 💧 None 💨 11 mph H 97%29.83 inHg

7:00 PM

Overcast

70° 💧 None 💨 14 mph H 78%29.88 inHg

Sunday

1:00 AM

Overcast night

63° 💧 None 💨 12 mph H 81%29.97 inHg

7:00 AM

Sunny

56° 💧 None 💨 8 mph H 83%30.09 inHg

1:00 PM

Sunny

51° 💧 None 💨 6 mph H 90%30.15 inHg

7:00 PM

Sunny

67° 💧 None 💨 10 mph H 58%30.21 inHg

Monday

1:00 AM

Clear night

60° 💧 None 💨 5 mph H 66%30.21 inHg

7:00 AM

Clear night

50° 💧 None 💨 4 mph H 86%30.27 inHg

1:00 PM

Sunny

46° 💧 None 💨 4 mph H 94%30.36 inHg

7:00 PM

Partly cloudy

65° 💧 None 💨 8 mph H 54%30.33 inHg

Tuesday

1:00 AM

Overcast night

60° 💧 None 💨 6 mph H 67%30.27 inHg

7:00 AM

Overcast night

55° 💧 None 💨 9 mph H 73%30.30 inHg

1:00 PM

Overcast

54° 💧 None 💨 8 mph H 76%30.33 inHg

7:00 PM

Overcast

59° 💧 None 💨 9 mph H 70%30.36 inHg

Wednesday

1:00 AM

Overcast night

59° 💧 None 💨 9 mph H 70%30.30 inHg

7:00 AM

Clear night

51° 💧 None 💨 6 mph H 85%30.36 inHg

1:00 PM

Sunny

47° 💧 None 💨 6 mph H 93%30.39 inHg

7:00 PM

Mostly sunny

65° 💧 None 💨 9 mph H 59%30.39 inHg

Thursday

1:00 AM

Clear night

60° 💧 None 💨 5 mph H 75%30.30 inHg

7:00 AM

Clear night

52° 💧 None 💨 6 mph H 91%30.36 inHg

1:00 PM

Sunny

47° 💧 None 💨 4 mph H 97%30.39 inHg

7:00 PM

Mostly cloudy

66° 💧 None 💨 6 mph H 63%30.39 inHg

Friday

1:00 AM

Overcast night

62° 💧 None 💨 6 mph H 74%30.33 inHg

7:00 AM

Mostly clear night

51° 💧 None 💨 4 mph H 94%30.36 inHg

1:00 PM

Sunny

47° 💧 None 💨 3 mph H 99%30.39 inHg

In St. Marys and, more broadly, across the state of Iowa: The evening will be mostly sunny with just a few clouds passing through. Temperatures will remain mild to warm, ranging from around 76 to 80 degrees Fahrenheit. Light southeast winds are expected, with speeds up to 7 mph and occasional gusts of the same strength. No rain is anticipated during this time, so the weather should stay clear and pleasant into the early night hours. Overall, it looks like a calm and comfortable evening.

15-Day Weather Outlook for St. Marys

Saturday, Sep 12Sat Sep 12

Mostly cloudy 79°/68° 💧 None 💨 11 mph

Sunday, Sep 13Sun Sep 13

Light rain 74°/60° 💧 0.417 in 💨 12 mph

Monday, Sep 14Mon Sep 14

Light thunderstorms 87°/58° 💧 2.219 in 💨 16 mph

Tuesday, Sep 15Tue Sep 15

Moderate rain 84°/65° 💧 0.404 in 💨 16 mph

Wednesday, Sep 16Wed Sep 16

Light thunderstorms 67°/59° 💧 2.448 in 💨 10 mph

Thursday, Sep 17Thu Sep 17

Moderate rain 69°/66° 💧 0.144 in 💨 8 mph

Friday, Sep 18Fri Sep 18

Light rain 79°/64° 💧 0.314 in 💨 8 mph

Saturday, Sep 19Sat Sep 19

Heavy rain 68°/62° 💧 3.993 in 💨 18 mph

Sunday, Sep 20Sun Sep 20

Overcast 70°/51° 💧 0.014 in 💨 14 mph

Monday, Sep 21Mon Sep 21

Sunny 67°/46° 💧 None 💨 10 mph

Tuesday, Sep 22Tue Sep 22

Partly cloudy 65°/54° 💧 0.001 in 💨 9 mph

Wednesday, Sep 23Wed Sep 23

Overcast 59°/47° 💧 None 💨 9 mph

Thursday, Sep 24Thu Sep 24

Mostly sunny 65°/47° 💧 None 💨 9 mph

Friday, Sep 25Fri Sep 25

Mostly cloudy 66°/47° 💧 None 💨 6 mph

TEMPERATURE OUTLOOK

Temperature & Weather Trends in St. Marys

Vertical axis: °F · Color based on temperature

AIR QUALITY FORECAST

Air Quality Forecast for St. Marys

Hourly forecast · Updated every 2 hours

Good

Nearest forecast value 12:00 AM

PM2.5 Fine particles Good 3,4µg/m³

Microscopic particles that can penetrate deep into the lungs. Elevated concentrations can especially affect children, older adults and people with respiratory conditions.

PM10 Particulate matter Good 3,7µg/m³

Includes dust, pollen and other airborne particles. High concentrations may irritate the respiratory system.

O₃ Ozone Good 40,0µg/m³

Ground-level ozone can irritate the eyes and respiratory system when concentrations are elevated.

NO₂ Nitrogen dioxide Good 3,9µg/m³

A gas emitted mainly by traffic and some industrial activity. High exposure can affect respiratory health.

Air quality is favorable for outdoor activities.

UV & HEALTH

UV, Sun & Health Outlook in St. Marys

Maximum daily UV Today, tomorrow and the following day show the maximum UV index forecast for each day.

0–2 Low 3–5 Moderate 6–7 High 8–10 Very high 11+ Extreme

Today UV 5,8Moderate —Unavailable

Tomorrow UV 6,7High 🙂Fair

Saturday UV 6,7High 🙂Fair

Sunday UV 4,5Moderate 😊Good

Monday UV 6,9High 🙂Fair

Tuesday UV 4,0Moderate —Unavailable

Wednesday UV 3,0Moderate —Unavailable

Today's weather health advice Open today's recommendations.

Moderate UV risk

Sunglasses and sun protection are recommended for prolonged exposure.

Good air quality

Air quality is good and outdoor activities can be enjoyed normally.

Comfortable temperature conditions

Temperatures should feel comfortable for most people, with no particular heat or cold precautions needed.

Good conditions for outdoor activities

Outdoor activities can generally be enjoyed normally, with sun protection adjusted to the UV level.

WIND OUTLOOK

Hourly Wind Forecast for St. Marys

Vertical axis: mph · Horizontal axis: hours

Sustained wind Max gusts

NIGHT SKY · ST. MARYS, IOWA

Tonight's Stargazing & Shooting Stars

Excellent observing conditions. Best local viewing window: 2:00 AM–3:00 AM.

100/100Best-hour score

BEST TIME TONIGHT 2:00 AM–3:00 AM Astronomical darkness: 9:07 PM–5:16 AM

☁ Cloud cover 0% Real hourly forecast for the best viewing hour.

☾ Moonlight 0% New Moon · Moon below the horizon at the best viewing hour.

☄ Meteor activity September ε-Perseids Reference ZHR 8 · Radiant 55° high at the best hour.

✦ Estimated visible meteors 1–4/hour Local estimate after weather, moonlight and radiant-height adjustments.

Chance ≥1 meteor in 30 min75%

UPCOMING METEOR PERIODSStart, peak and end dates · weather should be checked closer to the peak.

SEP 5–SEP 21

September ε-PerseidsStart SEP 5 · Peak SEP 9 · End SEP 21 · ZHR 8 · 6% Moon at peak

ACTIVE NOW

SEP 20–NOV 20

Southern TauridsStart SEP 20 · Peak NOV 5 · End NOV 20 · ZHR 7 · 20% Moon at peak

UPCOMING

OCT 2–NOV 7

OrionidsStart OCT 2 · Peak OCT 21 · End NOV 7 · ZHR 20 · 77% Moon at peak

UPCOMING

OCT 20–DEC 10

Northern TauridsStart OCT 20 · Peak NOV 12 · End DEC 10 · ZHR 5 · 7% Moon at peak

UPCOMING

Experimental local observing estimate. Weather values come from the hourly forecast already used on this page. Moon position and astronomical darkness are calculated locally from time and coordinates. Meteor-shower ZHR describes ideal conditions and is not the number of meteors a person should expect to see locally.

DISCOVER WEATHER NEARBY Weather in other cities

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Forecast data for St. Marys were last refreshed today at 11:57 PM. The current forecast period extends through 12/09/2026 at 9:00 PM. Weather, air-quality and UV-index data are provided through WEATHER-INFO.COM. Forecasts are produced automatically from the latest available data and are subject to periodic technical checks. This service is intended for general weather information.