Cloudy Weather Forecast for St. Marys, Pennsylvania

Rain, showers, and thunderstorms expected over the next week

Published on Mar. 4, 2026

The weather forecast for St. Marys, Pennsylvania over the next week calls for generally cloudy conditions with rain, showers, and thunderstorms throughout the period. Temperatures will range from highs in the 40s and 50s to lows in the 40s, with chances of rain varying from 40% to 100% on different days.

Why it matters

Knowing the upcoming weather is important for residents of St. Marys to plan their activities, prepare for potential severe weather, and ensure they have the appropriate clothing and supplies. The forecast also provides valuable information for local businesses, emergency services, and transportation authorities to anticipate and respond to changing weather conditions.

The details

The weather in St. Marys, Pennsylvania is expected to be cloudy with rain developing after midnight on Monday, with a 90% chance of rain and lows around 42°F. Tuesday will see rain throughout the day, with a 100% chance of rain and highs around 51°F. Wednesday will have a steady rain in the evening with showers continuing late, and lows around 47°F. Thursday will start cloudy but become partly cloudy later, with highs around 58°F. Friday will have cloudy skies with occasional showers late at night, and lows around 47°F. Saturday will see thundershowers following a period of rain early, with highs around 67°F and winds 10-20 mph. Sunday will be cloudy with light rain early, and lows around 42°F.

  • Monday night: Rain developing after midnight, 90% chance of rain, low around 42°F.
  • Tuesday: Rain throughout the day, 100% chance of rain, high around 51°F.
  • Wednesday: Steady rain in the evening, showers continuing late, low around 47°F.
  • Thursday: Cloudy early, partly cloudy later, high around 58°F.
  • Friday: Cloudy with occasional showers late, low around 47°F.

The players

weather.com

The Weather Channel's website, which provided the weather forecast data for St. Marys, Pennsylvania.

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The takeaway

Residents of St. Marys, Pennsylvania should be prepared for a week of unsettled weather, with rain, showers, and thunderstorms expected throughout the period. It's important to monitor the forecast and take appropriate precautions, such as having rain gear, umbrellas, and being aware of potential severe weather conditions.