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Current weather in St. Marys is broken clouds.

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

Now · 1:59 PM

St. Marys Weather & Hourly Forecast

United States · Pennsylvania · 15857

84°F

Mostly cloudy

Feels like: 92°F

💧 Humidity 75% 🌡 Pressure 29.94 inHg 💨 Wind 12 mph 👁 Visibility 6.2 mi ☁ Clouds 63% ☀️ UV index 7.9 · High 🌅 Sunrise 6:40 AM 🌇 Sunset 7:48 PM

Hourly Forecast for St. Marys

Today

2:00 PM

Mostly cloudy

84° 💧 None 💨 12 mph H 75%29.94 inHg

5:00 PM

Mostly cloudy

86° 💧 None 💨 10 mph H 63%29.94 inHg

8:00 PM

Mostly cloudy night

77° 💧 0.04 in 💨 3 mph H 85%29.97 inHg

11:00 PM

Light rain

71° 💧 0.06 in 💨 2 mph H 97%30.00 inHg

Tomorrow

2:00 AM

Overcast night

68° 💧 0.05 in 💨 1 mph H 97%30.03 inHg

5:00 AM

Overcast night

67° 💧 0.01 in 💨 2 mph H 98%30.03 inHg

8:00 AM

Light rain

69° 💧 0.08 in 💨 2 mph H 99%30.06 inHg

11:00 AM

Overcast

75° 💧 None 💨 6 mph H 93%30.06 inHg

2:00 PM

Moderate rain

83° 💧 0.08 in 💨 8 mph H 88%30.03 inHg

5:00 PM

Sunny

88° 💧 None 💨 6 mph H 50%29.97 inHg

8:00 PM

Mostly clear night

76° 💧 None 💨 4 mph H 81%29.94 inHg

11:00 PM

Light rain

70° 💧 0.16 in 💨 4 mph H 91%30.00 inHg

Thursday

2:00 AM

Light rain

64° 💧 0.14 in 💨 3 mph H 99%30.03 inHg

5:00 AM

Moderate rain

63° 💧 0.08 in 💨 4 mph H 99%30.00 inHg

8:00 AM

Light rain

67° 💧 0.10 in 💨 4 mph H 100%30.00 inHg

11:00 AM

Moderate rain

69° 💧 0.16 in 💨 11 mph H 98%30.06 inHg

Today

2:00 PM

Mostly cloudy

84° 💧 None 💨 12 mph H 75%29.94 inHg

3:00 PM

Mostly cloudy

84° 💧 None 💨 12 mph H 71%29.94 inHg

4:00 PM

Partly cloudy

85° 💧 None 💨 11 mph H 66%29.94 inHg

5:00 PM

Mostly cloudy

86° 💧 None 💨 10 mph H 63%29.94 inHg

6:00 PM

Mostly cloudy

85° 💧 None 💨 9 mph H 63%29.94 inHg

7:00 PM

Mostly cloudy

83° 💧 None 💨 5 mph H 74%29.97 inHg

8:00 PM

Mostly cloudy night

77° 💧 None 💨 3 mph H 85%29.97 inHg

9:00 PM

Light rain

74° 💧 0.02 in 💨 4 mph H 94%30.00 inHg

10:00 PM

Light rain

72° 💧 0.02 in 💨 4 mph H 97%30.03 inHg

11:00 PM

Light rain

71° 💧 0.01 in 💨 2 mph H 97%30.00 inHg

Tomorrow

12:00 AM

Moderate rain

69° 💧 0.04 in 💨 2 mph H 97%30.03 inHg

1:00 AM

Overcast night

69° 💧 None 💨 2 mph H 97%30.03 inHg

2:00 AM

Overcast night

68° 💧 None 💨 1 mph H 97%30.03 inHg

3:00 AM

Moderate rain

68° 💧 0.05 in 💨 2 mph H 98%30.03 inHg

4:00 AM

Overcast night

68° 💧 None 💨 2 mph H 98%30.03 inHg

5:00 AM

Overcast night

67° 💧 None 💨 2 mph H 98%30.03 inHg

6:00 AM

Light rain

67° 💧 0.01 in 💨 3 mph H 98%30.03 inHg

7:00 AM

Overcast

67° 💧 None 💨 2 mph H 99%30.06 inHg

8:00 AM

Light rain

69° 💧 0.01 in 💨 2 mph H 99%30.06 inHg

9:00 AM

Moderate rain

71° 💧 0.05 in 💨 3 mph H 99%30.06 inHg

10:00 AM

Light rain

72° 💧 0.01 in 💨 4 mph H 97%30.06 inHg

11:00 AM

Overcast

75° 💧 None 💨 6 mph H 93%30.06 inHg

12:00 PM

Overcast

81° 💧 None 💨 7 mph H 81%30.06 inHg

1:00 PM

Overcast

83° 💧 None 💨 9 mph H 65%30.03 inHg

2:00 PM

Moderate rain

83° 💧 0.05 in 💨 8 mph H 88%30.03 inHg

3:00 PM

Light rain

88° 💧 0.02 in 💨 7 mph H 73%30.00 inHg

4:00 PM

Sunny

89° 💧 None 💨 8 mph H 50%29.97 inHg

5:00 PM

Sunny

88° 💧 None 💨 6 mph H 50%29.97 inHg

6:00 PM

Sunny

82° 💧 None 💨 5 mph H 62%29.94 inHg

7:00 PM

Sunny

79° 💧 None 💨 4 mph H 78%29.97 inHg

8:00 PM

Mostly clear night

76° 💧 None 💨 4 mph H 81%29.94 inHg

9:00 PM

Overcast night

76° 💧 None 💨 5 mph H 74%29.97 inHg

10:00 PM

Overcast night

73° 💧 None 💨 5 mph H 82%29.97 inHg

11:00 PM

Light rain

70° 💧 0.02 in 💨 4 mph H 91%30.00 inHg

Thursday

12:00 AM

Moderate rain

68° 💧 0.08 in 💨 7 mph H 96%30.03 inHg

1:00 AM

Moderate rain

65° 💧 0.05 in 💨 6 mph H 97%30.03 inHg

2:00 AM

Light rain

64° 💧 0.03 in 💨 3 mph H 99%30.03 inHg

3:00 AM

Moderate rain

62° 💧 0.06 in 💨 3 mph H 99%30.00 inHg

4:00 AM

Moderate rain

62° 💧 0.05 in 💨 3 mph H 99%30.03 inHg

5:00 AM

Moderate rain

63° 💧 0.06 in 💨 4 mph H 99%30.00 inHg

6:00 AM

Light rain

63° 💧 0.01 in 💨 5 mph H 100%30.00 inHg

7:00 AM

Light rain

64° 💧 0.01 in 💨 4 mph H 100%30.00 inHg

8:00 AM

Light rain

67° 💧 0.04 in 💨 4 mph H 100%30.00 inHg

9:00 AM

Light rain

69° 💧 0.01 in 💨 5 mph H 98%30.00 inHg

10:00 AM

Moderate rain

70° 💧 0.06 in 💨 8 mph H 98%30.03 inHg

11:00 AM

Moderate rain

69° 💧 0.07 in 💨 11 mph H 98%30.06 inHg

12:00 PM

Moderate rain

67° 💧 0.09 in 💨 10 mph H 97%30.06 inHg

1:00 PM

Light rain

68° 💧 0.00 in 💨 8 mph H 95%30.03 inHg

2:00 PM

Overcast

71° 💧 None 💨 6 mph H 86%29.97 inHg

3:00 PM

Overcast

79° 💧 None 💨 11 mph H 61%29.94 inHg

4:00 PM

Overcast

79° 💧 None 💨 13 mph H 61%29.94 inHg

5:00 PM

Overcast

80° 💧 None 💨 10 mph H 64%29.91 inHg

6:00 PM

Overcast

75° 💧 None 💨 11 mph H 74%29.94 inHg

7:00 PM

Overcast

73° 💧 None 💨 9 mph H 79%29.94 inHg

8:00 PM

Mostly cloudy night

69° 💧 None 💨 6 mph H 92%29.97 inHg

9:00 PM

Mostly cloudy night

67° 💧 None 💨 2 mph H 97%29.97 inHg

10:00 PM

Mostly cloudy night

67° 💧 None 💨 4 mph H 98%29.97 inHg

11:00 PM

Light rain

67° 💧 0.02 in 💨 2 mph H 99%29.94 inHg

Friday

12:00 AM

Moderate rain

67° 💧 0.08 in 💨 3 mph H 100%29.94 inHg

1:00 AM

Heavy rain

67° 💧 0.16 in 💨 8 mph H 100%29.94 inHg

2:00 AM

Heavy rain

67° 💧 0.17 in 💨 4 mph H 99%29.91 inHg

3:00 AM

Overcast night

67° 💧 None 💨 3 mph H 99%29.91 inHg

4:00 AM

Overcast night

66° 💧 None 💨 4 mph H 99%29.94 inHg

5:00 AM

Overcast night

65° 💧 None 💨 4 mph H 99%29.94 inHg

6:00 AM

Overcast night

65° 💧 None 💨 4 mph H 99%29.91 inHg

7:00 AM

Overcast

65° 💧 None 💨 4 mph H 99%29.94 inHg

8:00 AM

Overcast

66° 💧 None 💨 5 mph H 98%29.94 inHg

9:00 AM

Mostly cloudy

68° 💧 None 💨 6 mph H 95%29.94 inHg

10:00 AM

Overcast

69° 💧 None 💨 6 mph H 92%29.94 inHg

11:00 AM

Overcast

73° 💧 None 💨 7 mph H 75%29.94 inHg

12:00 PM

Overcast

77° 💧 None 💨 7 mph H 65%29.94 inHg

1:00 PM

Overcast

79° 💧 None 💨 9 mph H 60%29.94 inHg

2:00 PM

Overcast

78° 💧 None 💨 9 mph H 60%29.91 inHg

3:00 PM

Overcast

77° 💧 None 💨 9 mph H 63%29.91 inHg

4:00 PM

Overcast

76° 💧 None 💨 9 mph H 65%29.91 inHg

5:00 PM

Overcast

76° 💧 None 💨 8 mph H 61%29.91 inHg

6:00 PM

Overcast

74° 💧 None 💨 8 mph H 64%29.91 inHg

7:00 PM

Overcast

69° 💧 None 💨 7 mph H 71%29.91 inHg

8:00 PM

Overcast night

63° 💧 None 💨 4 mph H 82%29.94 inHg

9:00 PM

Mostly cloudy night

60° 💧 None 💨 4 mph H 90%29.97 inHg

10:00 PM

Partly cloudy night

58° 💧 None 💨 3 mph H 95%29.97 inHg

11:00 PM

Partly cloudy night

58° 💧 None 💨 3 mph H 96%29.97 inHg

Saturday

12:00 AM

Mostly clear night

57° 💧 None 💨 4 mph H 96%29.97 inHg

1:00 AM

Mostly clear night

57° 💧 None 💨 3 mph H 97%29.97 inHg

2:00 AM

Mostly clear night

56° 💧 None 💨 3 mph H 97%29.97 inHg

3:00 AM

Clear night

56° 💧 None 💨 3 mph H 98%29.97 inHg

4:00 AM

Clear night

55° 💧 None 💨 2 mph H 98%29.97 inHg

5:00 AM

Clear night

55° 💧 None 💨 3 mph H 97%29.97 inHg

6:00 AM

Clear night

54° 💧 None 💨 4 mph H 98%29.97 inHg

7:00 AM

Sunny

53° 💧 None 💨 4 mph H 98%30.00 inHg

8:00 AM

Sunny

56° 💧 None 💨 3 mph H 93%30.00 inHg

9:00 AM

Sunny

60° 💧 None 💨 5 mph H 82%30.00 inHg

10:00 AM

Sunny

64° 💧 None 💨 7 mph H 68%30.00 inHg

11:00 AM

Sunny

67° 💧 None 💨 8 mph H 58%30.00 inHg

12:00 PM

Sunny

70° 💧 None 💨 8 mph H 52%30.00 inHg

1:00 PM

Sunny

72° 💧 None 💨 8 mph H 48%29.97 inHg

In St. Marys and, more broadly, across the state of Pennsylvania: The rest of the day will be characterized by mostly cloudy skies, with temperatures warming up to a comfortable range between 76 and 83 degrees Fahrenheit. Winds will be moderate, coming from the west at speeds up to 11 mph, with gusts reaching 17 mph. No significant rainfall is expected, so outdoor plans should be unaffected. The overall weather conditions suggest a mild and breezy afternoon, suitable for outdoor activities or errands. Temperatures will likely remain steady as the day progresses, with no major changes anticipated. It’s a good idea to have a light jacket or layers handy, especially if you're planning to be outside for extended periods. Overall, it looks like a pleasant day to enjoy the outdoors.

15-Day Weather Outlook for St. Marys

TomorrowTomorrow

Moderate rain 89°/67° 💧 0.28 in 💨 9 mph

Thursday, Sep 3Thu Sep 3

Moderate rain 80°/62° 💧 0.63 in 💨 13 mph

Friday, Sep 4Fri Sep 4

Heavy rain 78°/58° 💧 0.41 in 💨 9 mph

Saturday, Sep 5Sat Sep 5

Sunny 73°/54° 💧 None 💨 9 mph

Sunday, Sep 6Sun Sep 6

Overcast 74°/51° 💧 None 💨 5 mph

Monday, Sep 7Mon Sep 7

Mostly cloudy 79°/54° 💧 None 💨 7 mph

Tuesday, Sep 8Tue Sep 8

Heavy rain 61°/46° 💧 1.34 in 💨 12 mph

Wednesday, Sep 9Wed Sep 9

Light rain 67°/41° 💧 0.09 in 💨 9 mph

Thursday, Sep 10Thu Sep 10

Moderate rain 74°/59° 💧 0.56 in 💨 11 mph

Friday, Sep 11Fri Sep 11

Mostly cloudy 76°/57° 💧 None 💨 7 mph

Saturday, Sep 12Sat Sep 12

Moderate rain 74°/64° 💧 0.40 in 💨 8 mph

Sunday, Sep 13Sun Sep 13

Light rain 72°/54° 💧 0.03 in 💨 9 mph

Monday, Sep 14Mon Sep 14

Overcast 73°/53° 💧 None 💨 5 mph

Tuesday, Sep 15Tue Sep 15

Moderate rain 61°/48° 💧 0.35 in 💨 10 mph

Wednesday, Sep 16Wed Sep 16

Sunny 66°/42° 💧 None 💨 5 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

Fair

Nearest forecast value 2:00 PM

PM2.5 Fine particles Good 8,1µg/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 8,5µg/m³

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

O₃ Ozone Fair 63,0µg/m³

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

NO₂ Nitrogen dioxide Good 5,5µg/m³

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

Air quality is acceptable for most people.

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 7,9High 🙂Fair

Tomorrow UV 5,7Moderate 😐Moderate

Thursday UV 7,7High 🙂Fair

Friday UV 7,3High 🙂Fair

Saturday UV 6,0High 🙂Fair

Sunday UV 6,0High —Unavailable

Monday UV 6,0High —Unavailable

Hourly UV index today

2:00 PMUV 7,6 3:00 PMUV 5,8 4:00 PMUV 3,8 5:00 PMUV 2,1 6:00 PMUV 0,8 7:00 PMUV 0,1

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

Strong UV exposure

Protect exposed skin with SPF 30+ sunscreen, wear sunglasses, and try to limit direct midday sun.

Acceptable air quality

Air quality is acceptable for most people. Very sensitive people may want to reduce prolonged exertion.

Stay hydrated

Drink water regularly, especially during physical activity or prolonged sun exposure.

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

Internal PR simulation: 4.16 Population: 12,529

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Forecast data for St. Marys were last refreshed today at 1:59 PM. The current forecast period extends through 03/09/2026 at 11:00 AM. 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.