Fog and mist are hanging low over parts of Pittsburgh this Monday morning, May 18, with temperatures sitting in the mid-60s. That cool, gray start will not stick around for long. Afternoon sunshine is expected to crank readings into the upper 80s and into the 90s, which will feel even hotter in exposed neighborhoods. South-southwest breezes will pick up through the afternoon, so any outdoor plans later today are likely to feel sticky and uncomfortably warm.
Afternoon Heat and Who It Affects
Skies should turn mostly sunny this afternoon with a high near 91°F and south winds around 5 to 13 mph. The heat could hit older adults, children, and anyone without air conditioning the hardest, and there is also a small, localized chance for late-day strong wind gusts, according to the National Weather Service. Plan to drink plenty of water and dial back vigorous outdoor activity during the peak afternoon hours. If you are caring for someone sensitive to heat, consider getting them into a cool, air-conditioned space this afternoon and again on Tuesday.
Late-Day Storm Risk
Most of Monday looks dry, but a few isolated showers or thunderstorms could bubble up late in the day, mainly over the higher ridgelines and areas north of I-80. Any storm that does develop could produce brief, strong downburst gusts. Forecasters say confidence in storm development is low and the threat will be very localized, but thunderstorm chances increase more broadly from Tuesday evening into Wednesday as a front approaches. If skies start to darken or you hear thunder later today, be ready to head indoors quickly.
Practical Tips
Keep water, shade and a fully charged phone close at hand, avoid strenuous outdoor work during the afternoon, and check in on older neighbors or family members who might struggle with the heat. Allegheny County maintains a current list of cooling centers and activation details; you can call 2-1-1 for help or visit Allegheny County. If you have evening plans, keep an eye on radar and local forecasts, since conditions could still change quickly.
