As of 15:26 EDT

Weather in St. Clair, PA

84°

St. Clair, Saturday, 8 August, 15:26

Overcast. Feels like 92°. High 84°, low 67°.

Pressure29.97 inHg

Wind4 mph E

Humidity74%

Visibility6.2 mi

Dew point73°

See detailed hourly forecast

Sun, 0983° / 67°

83 °

St. Clair, Sunday, 9 August

Clear. High 83°, low 67°.

Pressure30.00 inHg

Wind7.7 mph NW

Humidity47%

Visibility6.2 mi

Dew point62°

Mon, 1085° / 67°

0.11

85 °

St. Clair, Monday, 10 August

Light rain. High 85°, low 67°.

Pressure30.03 inHg

Wind7.4 mph W

Humidity68%

Visibility6.2 mi

Dew point66°

Tue, 1185° / 66°

0.58

85 °

St. Clair, Tuesday, 11 August

Heavy rain. High 85°, low 66°.

Pressure29.91 inHg

Wind5.7 mph NW

Humidity64%

Visibility6.2 mi

Dew point66°

Wed, 1279° / 66°

0.06

79 °

St. Clair, Wednesday, 12 August

Light rain. High 79°, low 66°.

Pressure29.80 inHg

Wind8.3 mph NW

Humidity61%

Visibility6.2 mi

Dew point63°

Thu, 1377° / 61°

0.04

77 °

St. Clair, Thursday, 13 August

Light rain. High 77°, low 61°.

Pressure29.80 inHg

Wind10.2 mph NW

Humidity69%

Visibility—

Dew point64°

Fri, 1473° / 54°

73 °

St. Clair, Friday, 14 August

Clear. High 73°, low 54°.

Pressure29.97 inHg

Wind9.5 mph N

Humidity37%

Visibility—

Dew point43°

Sat, 1572° / 49°

72 °

St. Clair, Saturday, 15 August

Mostly clear. High 72°, low 49°.

Pressure30.18 inHg

Wind11.9 mph N

Humidity37%

Visibility—

Dew point42°

Sun, 1676° / 49°

76 °

St. Clair, Sunday, 16 August

Clear. High 76°, low 49°.

Pressure30.27 inHg

Wind5.6 mph NE

Humidity33%

Visibility—

Dew point42°

Mon, 1777° / 55°

77 °

St. Clair, Monday, 17 August

Overcast. High 77°, low 55°.

Pressure30.15 inHg

Wind9.4 mph S

Humidity57%

Visibility—

Dew point58°

Tue, 1875° / 62°

0.05

75 °

St. Clair, Tuesday, 18 August

Light rain. High 75°, low 62°.

Pressure29.97 inHg

Wind6.1 mph SW

Humidity87%

Visibility—

Dew point64°

Wed, 1977° / 59°

77 °

St. Clair, Wednesday, 19 August

Partly cloudy. High 77°, low 59°.

Pressure29.91 inHg

Wind10.1 mph N

Humidity50%

Visibility—

Dew point55°

Thu, 2072° / 55°

72 °

St. Clair, Thursday, 20 August

Overcast. High 72°, low 55°.

Pressure29.97 inHg

Wind4.4 mph SW

Humidity53%

Visibility—

Dew point52°

Fri, 2167° / 59°

0.49

67 °

St. Clair, Friday, 21 August

Rain. High 67°, low 59°.

Pressure29.88 inHg

Wind6 mph SE

Humidity99%

Visibility—

Dew point63°

Sat, 2280° / 64°

0.01

80 °

St. Clair, Saturday, 22 August

Light rain. High 80°, low 64°.

Pressure29.77 inHg

Wind9.8 mph NW

Humidity45%

Visibility—

Dew point54°

Sun, 2368° / 51°

68 °

St. Clair, Sunday, 23 August

Clear. High 68°, low 51°.

Pressure30.03 inHg

Wind14.9 mph NW

Humidity38%

Visibility—

Dew point39°

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. Clair, PA 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. Clair, PA 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.