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

55.4 F
Humidity:30%
Wind Speed: 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, 08:40 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 77 °F
Chance of T-storms
Friday
Night
Low 53 °F
Chance of T-storms
Saturday

High 66 °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 6 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 77°F. Wind 1 to 7 mph, with gusts as high as 13 mph.
Friday Night
Chance of Thunderstorms. Low around 53°F. Wind around 5 mph, with gusts as high as 7 mph.
Saturday
Thunderstorms. High near 66°F. Wind 6 to 7 mph, with gusts as high as 14 mph.
Saturday Night
Rain Likely. Low around 46°F. Wind around 8 mph, with gusts as high as 14 mph.
Sunday
Rain Showers Likely. High near 62°F. Wind 7 to 8 mph, with gusts as high as 14 mph.
Sunday Night
Chance of Showers. Low around 44°F. Wind 6 to 8 mph, with gusts as high as 13 mph.
Monday
Chance of Rain Showers. High near 66°F. Wind 6 to 9 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)
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
07:25 PM EDT 10.4 10.00 Clear -- 55.4 26.6 33% NA NA 30.06 1017.9
07:20 PM EDT 9.2 10.00 Clear -- 57.2 26.6 31% NA NA 30.06 1017.9
07:10 PM EDT 9.2 10.00 Clear -- 57.2 26.6 31% NA NA 30.06 1017.9
07:05 PM EDT 9.2 10.00 Clear -- 57.2 26.6 31% NA NA 30.05 1017.6
07:00 PM EDT 8.1 10.00 Clear -- 57.2 26.6 31% NA NA 30.06 1017.9
06:45 PM EDT SE 8.1 10.00 Mostly Clear -- 57.2 26.6 31% NA NA 30.05 1017.6
06:35 PM EDT SE 6.9 10.00 Mostly Cloudy -- 57.2 26.6 31% NA NA 30.06 1017.9
06:25 PM EDT 0.0 10.00 Mostly Cloudy -- 60.8 32.0 34% NA NA 30.05 1017.6
06:20 PM EDT 3.4 10.00 Cloudy -- 60.8 32.0 34% NA NA 30.06 1017.9
06:15 PM EDT W 4.6 10.00 Cloudy -- 60.8 32.0 34% NA NA 30.06 1017.9
06:05 PM EDT SW 5.7 10.00 Cloudy -- 60.8 32.0 34% NA NA 30.06 1017.9
06:00 PM EDT 3.4 10.00 Cloudy -- 60.8 30.2 31% NA NA 30.06 1017.9
05:50 PM EDT W 4.6 10.00 Cloudy -- 60.8 30.2 31% NA NA 30.06 1017.9

Regional Weather Observation

JOHNSTOWN (KJST)

Clear
55.4 F

BEDFORD (KHMZ)

Clear
56.3 F

ALTOONA (KAOO)

Clear
53.6 F

SOMERSET (K2G9)

Clear
55.4 F

INDIANA/STEWART (KIDI)

Clear
44.6 F

LATROBE/WESTMORL (KLBE)

Clear
66.2 F
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