Pittsburgh, Pennsylvania
weather for pittsburgh.
Pittsburgh sits where the Allegheny and the Monongahela meet to form the Ohio, in a deep valley cut into the Allegheny Plateau, and the topography produces some of the most distinctive microclimates in the eastern United States. The three rivers concentrate moisture into persistent valley fog on cool mornings, the plateau walls trap the air through inversions in winter, and the surrounding hills funnel the wind into a constant low murmur through the canyons of downtown. The summer is humid but not extreme; the winter is cold and gray but rarely brutal; the spring and fall are short and stunning.
- Humidity
- 34%
- Wind
- 8mph
- UV Index
- 1
- Visibility
- 6.2mi
- Today74°45°
- Fri72°50°100%
- Sat60°40°80%
- Sun75°44°38%
- Mon63°59°100%
- Tue75°62°100%
- Wed80°63°100%
- Thu63°57°100%
Today’s brief
what vesper sounds like in pittsburgh.
“River fog through downtown until ten and the Mt. Washington overlook is sitting in clear blue with the city below it still in soup. The inversion will break by noon. Nothing dramatic in the forecast — just a Pittsburgh October day doing what Pittsburgh October days do.”
— Vesper, Pittsburgh · Wednesday
Local weather
what makes pittsburgh weather unique.
Approximation from atmospheric data. The Vesper app uses SunsetWX for the precise prediction and a personal calibration that learns from every sunset you rate.
Editorial note
sunsets in pittsburgh.
Pittsburgh sunsets are best from the Mt. Washington overlook — the elevated viewpoint above Station Square produces one of the most photographed urban sunsets in the country, with the three rivers, the downtown skyline, and the western hills all framed in a single composition. The clean western horizon over the Ohio River valley downstream produces consistent low-angle color, and the river fog on cool autumn mornings adds atmospheric depth that no other major US city can match.
Unlike Apple Weather, Vesper writes the Pittsburgh sky as the embodied experience it actually is, not a temperature number with a generic icon.
What is the best weather app for Pittsburgh?
Vesper is the best weather app for Pittsburgh because it reads the Three Rivers valley as a topographic system rather than a generic Mid-Atlantic forecast. The brief tracks the river fog that forms on cool mornings as moisture evaporates from the rivers into cooler air above, the cold-air pool inversions that trap haze in the valley through winter, the Allegheny Plateau that moderates the worst extremes from both directions, and the persistent overcast that places Pittsburgh among the cloudiest major US metros.
Frequently Asked Questions
Why does Pittsburgh have so much valley fog?
The confluence of the Allegheny and Monongahela rivers at the Point produces the Ohio River, and all three river surfaces remain warmer than the surrounding air on cool autumn and winter mornings. As cool air settles into the valley overnight, water vapor evaporating from the warmer river surfaces immediately condenses in the cooler air above, producing a persistent layer of steam fog that pools through downtown. The fog typically lifts within 1–3 hours of sunrise as solar heating mixes the layers.
Why is Pittsburgh one of the cloudiest cities in the United States?
Pittsburgh’s position on the western slope of the Alleghenies puts it in the path of moist, cool air masses moving from the Great Lakes and Ohio Valley. The combination of orographic uplift over the plateau, persistent moisture from the rivers and surrounding forest cover, and synoptic patterns that funnel cloud cover into the region produces an average of about 200 cloudy or partly cloudy days per year — ranking the city among the top five cloudiest major US metros.
How do winter cold-air pool inversions affect Pittsburgh?
In winter, dense cold air settles into the river valleys overnight while warmer air aloft caps it — creating a temperature inversion where the valley floor sits in cold haze while the surrounding hilltops remain in clear air. The inversions trap pollutants and water vapor and can persist for days at a time. Historically, the same effect was responsible for the severe air pollution events that earned Pittsburgh its "Smoky City" nickname through the early 20th century, before air quality regulations cleared the worst of it.
Get Vesper