Pittsburgh is getting the full weather roller coaster on Tuesday, April 21, 2026. The day started under clear skies with a sharp morning freeze, temperatures near 30°F at sunrise, and a Freeze Warning in place until 9 a.m. EDT. Tender plants and exposed outdoor pipes are on the line early, but by late morning, the sun takes over and the city heads for a quick warmup into the upper 60s with a light southerly breeze. After sunset, a cold front moves in and flips the script again, bringing a solid chance for showers and thunderstorms into the early hours of Wednesday.
Morning Freeze Warning
A Freeze Warning from the National Weather Service is in effect through 9 a.m. EDT, with readings as low as 25–30°F capable of damaging sensitive vegetation. The alert covers portions of western Pennsylvania, eastern Ohio, and northern West Virginia, according to NWS Pittsburgh. If you have potted plants on the porch or tender growth in the garden, they need to be covered or brought inside early. Even after the air warms, plants that take a hit from this morning’s frost can stay stressed on cold ground.
Sunny Afternoon, Warm Temperatures
By midday, the morning chill gives way to sunshine and a quick rebound in temperatures, with Tuesday’s highs expected to top out near 68°F. A light southerly wind in the morning picks up a bit this afternoon, making the warmup feel especially noticeable after that early freeze. If you’ve been itching to start serious spring planting, forecasters suggest holding off until tonight’s lows are through and the soil has more time to warm.
Tonight And Wednesday
From late Tuesday night into early Wednesday, April 21–22, the weather turns unsettled. Expect a chance of rain showers between about 11 p.m. and 2 a.m., then showers and thunderstorms become likely overnight as the cold front pushes through, with an overnight low near 55°F, per NWS Pittsburgh. Most spots are projected to see light rainfall totals, but brief heavy downpours and a few rumbles of thunder are on the table. Wednesday trends milder overall, with a high near 71°F and additional scattered showers possible during the day…