Pennsylvania Weather Alert: Hot, Sunny Conditions Return to Pittsburgh by Monday, July 21st — Summer Weather Alert in Effect

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Pittsburgh, PA – Hot, dry air will dominate much of western Pennsylvania Monday, July 21st, as sunshine and rising temperatures usher in a mid-summer weather alert. Expect high temperatures to reach 91°F by mid-afternoon across Allegheny County, with clear skies extending into Monday night.

According to the National Weather Service in Pittsburgh, Monday’s weather will remain calm with northeast winds around 5 mph and no chance of rain. It’s a welcome break from the scattered weekend thunderstorms but comes with a reminder: limit strenuous outdoor activity during peak heat and stay hydrated. Roadways like I-376 and Route 28 should stay clear for commuters, though heat-related vehicle issues could increase.

By Tuesday, sunshine will continue with highs near 85°F. Wednesday brings even warmer conditions—expect mostly sunny skies and a high of 91°F again. Overnight lows will dip into the mid-60s to low 70s most nights, offering some relief.

Looking Ahead:

  • Thursday brings partly cloudy skies with a continued high near 92°F. A 50% chance of thunderstorms could disrupt afternoon plans.
  • Friday continues the pattern with more thunderstorms possible overnight into Saturday.
  • Saturday stays hot and humid, near 90°F, with another 50% chance of showers and storms—an early warning for weekend event planners.

Prepare now for rising temps and scattered storms later this week. Stay alert for updated advisories mid-week.