Pittsburgh woke up Monday, April 20, 2026, to a raw start: mostly cloudy skies, scattered showers, and temperatures hovering near freezing around 36°F. A Frost Advisory is already in place through 10 a.m., and the National Weather Service is warning that the real punch is coming late tonight into Tuesday morning, with a more widespread Freeze Warning on the way.
The Freeze Warning covers the Pittsburgh metro and surrounding counties and calls for sub-freezing temperatures, with lows in the mid-20s to near 30°F by Tuesday morning. In its official message, the agency urges residents to “take steps now to protect tender plants.” According to NWS Pittsburgh, the Freeze Warning runs from 11 p.m. tonight to 9 a.m. Tuesday, while the Frost Advisory remains in effect this morning.
What To Expect Today And Tonight
Scattered rain and a few snow showers are possible early this morning, tapering off by mid-morning. Skies should then turn partly sunny with a high near 50°F. Northwest winds will run around 7 to 12 mph, with gusts picking up in the afternoon. Tonight looks mostly clear with a low near 30°F.
Gardens, Pipes And The Morning Commute
If you have already put out early plants or potted herbs, bring them inside or cover them tonight to avoid damage. Some minor accumulation on grass is possible this morning, but road surfaces are forecast to stay in the mid-30s to near 40°F, so major travel impacts are unlikely. Localized frost will be most likely in sheltered low spots and valley areas.
Warm-Up Midweek
High pressure builds Tuesday, pushing temperatures into the upper 60s to low 70s by midweek. A weak front may then bring scattered showers and isolated thunderstorms Wednesday into the weekend. For the latest timing and any changes, see the full forecast from NWS Pittsburgh.
We will update this space if headlines change; otherwise, expect a sharp swing from frost to a warm stretch by Thursday. Check local forecasts this evening and cover sensitive plants before bedtime.
