Saint Marys, PA Weather Forecast
Local 7-day forecast
Partly Sunny then Chance Showers And Thunderstorms
Track current conditions, temperature changes, wind, and the full daily outlook for Saint Marys, PA in one place.
A chance of showers and thunderstorms after 2pm. Partly sunny, with a high near 78. Chance of precipitation is 50%.
Local Weather Overview
This forecast page for Saint Marys, PA is designed for quick trip planning, giving you a clean read on daytime highs, overnight lows, and changing conditions across the upcoming forecast window. Latest sync: Apr 15, 2026 1:53 PM EDT.
The active forecast window currently covers Apr 18 to Apr 21, 2026 for Saint Marys, PA.
Page Snapshot
- Page focus
- city weather
- Forecast window
- Apr 18 to Apr 21, 2026
- Latest sync
- Apr 15, 2026 1:53 PM EDT
- Forecast office
- CTP
- Source
- NOAA / NWS
Daily Outlook
This Week in Saint Marys
Saturday looks like the warmest upcoming period in Saint Marys at 78 degrees F.
Monday Night is the coolest period ahead with temperatures near 26 degrees F.
The strongest winds are forecast for Sunday at about 9 to 15 mph W.
Precipitation is mentioned in 6 upcoming forecast periods.
Forecast Details
- Last updated
- Apr 15, 2026 1:53 PM EDT
- Coverage
- 4 days
- Time zone
- America/New_York
- Forecast office
- CTP
- Radar station
- KCCX
Weather data is provided by the National Weather Service and refreshed automatically for U.S. locations.
Open NOAA sourceExtended Forecast
Showers and thunderstorms likely. Mostly cloudy, with a low around 41. Chance of precipitation is 60%.
Rain showers likely. Mostly cloudy, with a high near 55. Chance of precipitation is 60%.
A chance of rain showers before 8pm, then a chance of snow showers. Mostly cloudy, with a low around 28. Chance of precipitation is 40%.
A slight chance of snow showers before 8am. Mostly sunny, with a high near 44.
Mostly clear, with a low around 26.
Sunny, with a high near 61.
A slight chance of rain showers after 8pm. Partly cloudy, with a low around 42.
Detailed Forecast
| Period | Conditions | Temp | Wind |
|---|---|---|---|
|
Saturday
Apr 18
|
Partly Sunny then Chance Showers And Thunderstorms
|
78°F |
2 to 10 mph
S
|
|
Saturday Night
Apr 18
|
Showers And Thunderstorms Likely
|
41°F |
9 mph
SW
|
|
Sunday
Apr 19
|
Rain Showers Likely
|
55°F |
9 to 15 mph
W
|
|
Sunday Night
Apr 19
|
Chance Snow Showers
|
28°F |
10 to 14 mph
W
|
|
Monday
Apr 20
|
Slight Chance Snow Showers then Mostly Sunny
|
44°F |
12 to 15 mph
NW
|
|
Monday Night
Apr 20
|
Mostly Clear
|
26°F |
5 to 13 mph
W
|
|
Tuesday
Apr 21
|
Sunny
|
61°F |
5 to 10 mph
SW
|
|
Tuesday Night
Apr 21
|
Slight Chance Rain Showers
|
42°F |
8 mph
SW
|
Nearby Forecasts
Explore weather pages for nearby cities and major places around Saint Marys.
