What September feels like in Pittsburgh
Early autumn arrives in Pittsburgh with September. Days are warm enough for short sleeves, and time outdoors is easy. After sunset it cools off noticeably — nights stay mild. Some humidity hangs in the air, noticeable when the sun is strong.
Rain in Pittsburgh in September
Showers are a regular feature, arriving about one day in 3. When rain comes it is heavy, about 9.6 mm (0.4 in) per wet day, often in short, strong bursts. Across the year Pittsburgh averages about 8.3 mm per rainy day, so September is typical.
Daylight and sunshine in September
On 15 September the sun rises at about 7:00 am and sets around 7:31 pm local time, giving 12 h 32 min of daylight. Evenings are drawing in — 1 h 18 min less daylight than mid-August. The sun is out for roughly 74% of those daylight hours, so there are plenty of bright spells.
How September compares to the rest of the year
In Pittsburgh's temperature order, September sits as the 4th warmest month. Against August, the average high is 3.2°C (5.8°F) lower, with 2 mm more rain. Temperatures keep falling into October. By October, typical highs are 17.7°C (63.9°F).
Who September suits
- Sightseeing: a good fit — daytime temperatures are fine for walking around.
- Parks & outdoor: a good fit — pleasant for gardens, parks and riversides.
Tips for visiting Pittsburgh in September
Versatile Layers
Mornings and evenings are cooler than midday, so dress in layers.
Rain Protection
A compact umbrella and a light waterproof jacket.
Sunglasses
Frequent sunshine — sunglasses and a light hat.
Quick questions
How warm is Pittsburgh in September?
Expect around 24.5°C (76.1°F) in the afternoon and 14.8°C (58.6°F) at night, which most visitors would call warm.
Does it rain a lot in Pittsburgh in September?
It does: about 10 rainy days bring roughly 96 mm, so plan some indoor options.
What should I wear in Pittsburgh in September?
The numbers point to versatile layers, rain protection and sunglasses. Bring something extra for the cooler evenings.
Is September or October better for visiting Pittsburgh?
September, clearly: it ranks #1 of 12 among Pittsburgh's months, against #5 for the other. October is cooler and has more rainy days.