St Clairsville, PA Weather Forecast & Alerts

Current conditions, 5-day forecast, and active NWS weather alerts for St Clairsville, PA.

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Current Conditions — St Clairsville, PA

JOHNSTOWN (KJST)

Clear

51.8 F
Humidity:35%
Wind Speed:S 9.2 mph
Barometer:30.06 in
Dewpoint:24.8 F
Visibility:10.00 mi
Precip:--
Heat Index:NA
Wind Chill:NA
Apr 21 2026, 10:20 PM EDT
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5-Day Forecast — St Clairsville, PA

Tuesday

High 62 °F
Partly Sunny
Tuesday
Night
Low 44 °F
Chance of Rain
Wednesday

High 71 °F
Chance of Rain Showers
Wednesday
Night
Low 46 °F
Partly Cloudy
Thursday

High 75 °F
Partly Sunny
Thursday
Night
Low 51 °F
Partly Cloudy
Friday

High 75 °F
Chance of T-storms
Friday
Night
Low 50 °F
Chance of T-storms
Saturday

High 60 °F
T-storms

Detailed Forecast — St Clairsville, PA

Tuesday
Partly Sunny. High near 62°F. Wind around 6 mph, with gusts as high as 13 mph.
Tuesday Night
Chance of Rain. Low around 44°F. Wind 3 to 5 mph, with gusts as high as 12 mph.
Wednesday
Chance of Rain Showers. High near 71°F. Wind 6 to 10 mph, with gusts as high as 18 mph.
Wednesday Night
Partly Cloudy. Low around 46°F. Wind 1 to 6 mph, with gusts as high as 12 mph.
Thursday
Partly Sunny. High near 75°F. Wind 1 to 7 mph, with gusts as high as 13 mph.
Thursday Night
Partly Cloudy. Low around 51°F. Wind 1 to 3 mph, with gusts as high as 8 mph.
Friday
Chance of Thunderstorms. High near 75°F. Wind 1 to 7 mph, with gusts as high as 13 mph.
Friday Night
Chance of Thunderstorms. Low around 50°F. Wind 2 to 5 mph, with gusts as high as 7 mph.
Saturday
Thunderstorms. High near 60°F. Wind around 7 mph, with gusts as high as 15 mph.
Saturday Night
Rain Likely. Low around 44°F. Wind 6 to 9 mph, with gusts as high as 14 mph.
Sunday
Rain Showers Likely. High near 59°F. Wind 5 to 6 mph, with gusts as high as 9 mph.
Sunday Night
Chance of Rain Showers. Low around 41°F. Wind 2 to 5 mph, with gusts as high as 9 mph.
Monday
Slight Chance of Showers. High near 66°F. Wind 2 to 8 mph, with gusts as high as 14 mph.
Monday Night
Chance of Rain. Low around 46°F. Wind around 10 mph, with gusts as high as 16 mph.
PA Radar
Current Radar • PA
Day 1 Outlook • April 22, 2026

Observation History — St Clairsville, PA

Time Wind
(mph)		 Vis
(mi)		 Weather Precip (in) Temperature (F) Relative
Humidity		 Wind
Chill
(F)		 Heat
Index
(F)		 Pressure
Air Dwpt altimeter
(in)		 sea level
(mb)
10:20 PM EDT S 9.2 10.00 Clear -- 51.8 24.8 35% NA NA 30.06 1017.9
10:15 PM EDT 10.4 10.00 Clear -- 51.8 24.8 35% NA NA 30.06 1017.9
10:05 PM EDT 10.4 10.00 Clear -- 51.8 24.8 35% NA NA 30.06 1017.9
09:55 PM EDT SE 6.9 10.00 Clear -- 51.8 24.8 35% NA NA 30.07 1018.3
09:45 PM EDT 11.5 10.00 Clear -- 53.6 24.8 32% NA NA 30.07 1018.3
09:40 PM EDT 10.4 10.00 Clear -- 53.6 24.8 32% NA NA 30.07 1018.3
09:35 PM EDT 10.4 10.00 Clear -- 53.6 24.8 32% NA NA 30.07 1018.3
09:25 PM EDT 10.4 10.00 Clear -- 53.6 24.8 32% NA NA 30.07 1018.3
09:20 PM EDT 9.2 10.00 Clear -- 53.6 24.8 32% NA NA 30.07 1018.3
09:10 PM EDT 8.1 10.00 Clear -- 53.6 24.8 32% NA NA 30.07 1018.3
09:05 PM EDT 9.2 10.00 Clear -- 53.6 24.8 32% NA NA 30.07 1018.3
08:55 PM EDT 9.2 10.00 Clear -- 53.6 24.8 32% NA NA 30.06 1017.9
08:50 PM EDT 10.4 10.00 Clear -- 53.6 24.8 32% NA NA 30.06 1017.9
08:40 PM EDT 9.2 10.00 Clear -- 55.4 24.8 30% NA NA 30.06 1017.9
08:35 PM EDT 9.2 10.00 Clear -- 53.6 24.8 32% NA NA 30.06 1017.9
08:25 PM EDT 9.2 10.00 Clear -- 53.6 26.6 35% NA NA 30.06 1017.9
08:20 PM EDT 9.2 10.00 Clear -- 55.4 26.6 33% NA NA 30.06 1017.9
08:10 PM EDT 8.1 10.00 Clear -- 53.6 26.6 35% NA NA 30.06 1017.9
08:05 PM EDT 6.9 10.00 Clear -- 55.4 26.6 33% NA NA 30.06 1017.9
08:00 PM EDT 6.9 10.00 Clear -- 53.6 26.6 35% NA NA 30.06 1017.9
07:50 PM EDT 6.9 10.00 Clear -- 55.4 26.6 33% NA NA 30.06 1017.9
07:40 PM EDT 6.9 10.00 Clear -- 55.4 26.6 33% NA NA 30.06 1017.9
07:35 PM EDT 6.9 10.00 Clear -- 55.4 26.6 33% NA NA 30.06 1017.9
07:30 PM EDT 6.9 10.00 Clear -- 55.4 26.6 33% NA NA 30.06 1017.9

Regional Weather Observation

JOHNSTOWN (KJST)

Clear
51.8 F

BEDFORD (KHMZ)

Clear
52.7 F

ALTOONA (KAOO)

Clear
51.8 F

SOMERSET (K2G9)

Clear
51.8 F

INDIANA/STEWART (KIDI)

Clear
44.6 F

LATROBE/WESTMORL (KLBE)

Clear
55.4 F
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