Pittsburgh in September
In September, Pittsburgh averages 25°C (76°F) during the day and 15°C (58°F) at night, with frequent rain — about 16 days of the month see precipitation (94 mm total).
ShoulderConditions are comfortable for sightseeing without being sweltering. Expect daily rain or showers, often in heavy bursts.
It's peak hurricane season in Pittsburgh during September. Travel is possible but expect storm risk, possible flight disruption, and generally lower travel insurance coverage.
How September compares to the rest of the year in Pittsburgh
September is in the middle of the year for warmth in Pittsburgh (4th of 12) and one of the driest months (10th of 12). Daytime temperature runs 8°C above the annual average (17°C). September runs 3°C cooler than August (27°C) and cools 7°C in October (18°C).
September sunrise & sunset in Pittsburgh
Times shown for Pittsburgh local time (America/New_York), calculated for the 15th of September. They shift by a few minutes day to day across the month.
Photography light in Pittsburgh — September
Golden-hour and blue-hour windows for the 15th of September, in Pittsburgh's local time. Use these for soft warm light (golden) or cool architectural twilight (blue).
📅 When to book — Pittsburgh in September
Travel writers usually only tell you when to go. Here's when to book flights and lodging for the best mix of price and availability, based on September's tier (Shoulder) and Pittsburgh's popularity.
Crowds & pricing — September in Pittsburgh
Pittsburgh is in a shoulder season month — fewer crowds, slightly lower prices, and a calmer atmosphere than peak weeks. Most major sights stay open with normal hours, though a handful of seasonal restaurants or boat trips may run reduced schedules. Many regulars consider these months the best time to visit because you trade a small amount of weather reliability for a much more pleasant on-the-ground experience.
Why this tier: comfortable tourism weather peak hazard season (1 active)
Sun & mosquito risk — September in Pittsburgh
UV is a clear-sky sea-level estimate — clouds, altitude, and reflective surfaces (snow, water) shift it ±30%. Mosquito risk is climate-derived only; for current disease advisories (dengue, malaria, zika) check the CDC or WHO travel pages before your trip.
Pittsburgh in other months
| Month | Avg high | Avg low | Rainfall | Rain days | Snow days |
|---|---|---|---|---|---|
| January | 3°C / 37°F | -6°C / 21°F | 87 mm | 19 | — |
| February | 6°C / 42°F | -5°C / 24°F | 111 mm | 17 | — |
| March | 10°C / 50°F | -1°C / 31°F | 100 mm | 19 | — |
| April | 16°C / 62°F | 5°C / 41°F | 122 mm | 20 | — |
| May | 22°C / 71°F | 12°C / 53°F | 124 mm | 19 | — |
| June | 26°C / 79°F | 16°C / 61°F | 160 mm | 21 | — |
| July | 28°C / 83°F | 19°C / 65°F | 113 mm | 23 | — |
| August | 27°C / 81°F | 18°C / 64°F | 111 mm | 21 | — |
| September | 25°C / 76°F | 15°C / 58°F | 94 mm | 16 | — |
| October | 18°C / 64°F | 9°C / 48°F | 110 mm | 17 | — |
| November | 10°C / 51°F | 2°C / 35°F | 73 mm | 14 | — |
| December | 6°C / 44°F | -1°C / 30°F | 94 mm | 16 | — |
Other cities with similar September weather
🌍 See the full ranked list of climate twins for Pittsburgh in September →
Frequently asked questions
How hot is Pittsburgh in September?
In September, Pittsburgh averages a high of 25°C (76°F) and a low of 15°C (58°F) — generally warm.
Does it rain a lot in Pittsburgh in September?
September is quite rainy in Pittsburgh, with about 16 rainy days on average.
Is September a good time to visit Pittsburgh?
September is warm but on the rainy side. It suits travelers who are comfortable with warm weather; check the month-by-month ranking to compare it against the rest of the year.
What should I pack for Pittsburgh in September?
Pack light layers for warm days and cooler evenings, plus a compact umbrella or rain jacket. See the full September packing list for Pittsburgh for a complete, climate-based checklist.
Check the live 10-day forecast and sunrise/sunset.