Early Sunday morning, June 21, Pittsburgh woke up to clear skies and a cool, muggy start - Allegheny County Airport (KAGC) logged temperatures around 57°F. Low-lying river valleys may still be hanging on to pockets of patchy fog, but that should burn off by midmorning.
Afternoon: Mostly Sunny, High Near 81
By midday and afternoon, sunshine should be the main story, with highs near 81°F across the metro and a light west breeze around 3 to 7 mph. Clouds are expected to increase toward evening as moisture moves in, but most of Sunday still looks dry for cookouts, ballgames, and last-minute errands.
Late Night Into Monday: Soaking Rain And Thunder
Rain and storms start muscling back in late Sunday night into Monday, June 22. A slight chance of showers and thunderstorms is on the table between about 2 a.m. and 3 a.m. Monday, followed by more widespread showers and thunderstorms. Tonight's low should land near 62°F, with Monday's high near 77°F. The chance of precipitation is around 80% Sunday night and 90% Monday, with new rainfall totals of about a tenth to a quarter inch possible Sunday night and roughly a half to three-quarters of an inch possible Monday, according to the National Weather Service.
Flooding And Severe Threats
Forecasters have trimmed back some of the higher-end rainfall projections, but note that heavier bands could still set up south and southeast of the city. Isolated flooding is possible if storms repeatedly track over the same neighborhoods. The Weather Prediction Center has placed parts of the Ohio Valley under a Slight Risk for excessive rainfall, so localized flash flooding cannot be ruled out and will be watched closely.
Commute And Airport Impacts
Drivers could be dealing with slick roads Monday morning, and brief downpours may quickly cut visibility, so it is worth budgeting a little extra time for the commute. River-valley fog Sunday morning may also trim visibility for a few hours, and lower ceilings and reduced visibility are possible overnight Sunday into Monday. Travelers should check their airline or real-time alerts before heading to the airport.
If you have outdoor plans lined up for Sunday night or Monday, it is wise to move them inside, have a backup option, and keep the rain gear close. Keep an eye on updates from the National Weather Service and local officials for any watches or warnings Monday morning.
