September
Other strong months: May and June
82/100 weather score
United States · 1991–2020
Best time to visit
Pittsburgh
For Pittsburgh, September has the most comfortable weather in our climate comparison. Typical daytime highs are 25.5°C, nights average 13.6°C, and rainfall totals about 82 mm. Figures use measured 1991–2020 normals from the nearest eligible NOAA station.
Best all-round monthSeptember
Typical daytime high25.5°C
Typical night-time low13.6°C
September rainfall82 mm
October
Other strong months: May and April
78/100 weather score
Make the answer personal
Choose the weather
that suits you.
Set the daytime temperature and rainfall you are comfortable with. We will show only the months that meet every choice, using the measured 1991–2020 averages below.
3 months fit your choices for Pittsburgh
The lowest comfort score is 5 out of 100. January, February and December share that score. In January, that is mainly because days reach only 3.7°C, 20° below the 24°C the score treats as ideal.
Quick answers
Planning a trip to Pittsburgh?
These answers come from the same measured monthly climate record shown on this page.
When is the best time to visit Pittsburgh?
September is the strongest all-round choice in our temperature-and-rainfall comparison, with a typical daytime high of 25.5°C and 82 mm of rain.
What is the hottest month in Pittsburgh?
July is hottest in this record, with a typical daytime high of 29.5°C and a night-time low of 18.5°C.
Which month has the least rain?
February has the lowest monthly rainfall total at 68 mm.
Is this a weather forecast?
No. These are long-term measured averages from 1991–2020. Check a current forecast before you travel.
Month by month
See how the weather
changes through the year.
The bars combine daytime temperature, night-time temperature and rainfall. The figures are measured historical averages, not a forecast for a particular trip.
| Month | Day | Night | Rain | Wet days | Daylight | Comfort | Coverage |
|---|---|---|---|---|---|---|---|
| January | 3.7°C | -5.4°C | 82 mm | 10.6 | 9 h 35 | 5 | Strong coverage |
| February | 5.2°C | -4.7°C | 68 mm | 9.3 | 10 h 36 | 5 | Strong coverage |
| March | 10.6°C | -0.7°C | 81 mm | 9.9 | 11 h 49 | 15 | Strong coverage |
| April | 17.8°C | 4.8°C | 83 mm | 10.6 | 13 h 13 | 47 | Strong coverage |
| May | 22.9°C | 10.5°C | 88 mm | 10.6 | 14 h 24 | 74 | Strong coverage |
| June | 27.3°C | 15.9°C | 92 mm | 9.4 | 15 h 03 | 74 | Strong coverage |
| July | 29.5°C | 18.5°C | 95 mm | 8.6 | 14 h 47 | 62 | Strong coverage |
| August | 28.8°C | 17.5°C | 88 mm | 7.9 | 13 h 46 | 68 | Strong coverage |
| September | 25.5°C | 13.6°C | 82 mm | 7.3 | 12 h 25 | 82 | Strong coverage |
| October | 18.6°C | 7.2°C | 71 mm | 8.3 | 11 h 03 | 58 | Strong coverage |
| November | 11.9°C | 1.6°C | 70 mm | 8.3 | 9 h 52 | 26 | Strong coverage |
| December | 5.9°C | -2.4°C | 71 mm | 9.7 | 9 h 18 | 5 | Strong coverage |
| Month | Record high | Record low | Wettest day | Wettest / driest month | Years |
|---|---|---|---|---|---|
| January | 22.2°C31 Jan 2002 | -25.0°C21 Jan 1994 | 61 mm12 Jan 2018 | 182 mm1996 · driest 27 mm in 1997 | 35 |
| February | 25.6°C25 Feb 2017 | -23.3°C20 Feb 2015 | 93 mm13 Feb 2019 | 198 mm2019 · driest 17 mm in 2009 | 35 |
| March | 29.4°C31 Mar 1998 | -18.9°C7 Mar 2015 | 51 mm27 Mar 2026 | 149 mm2011 · driest 5 mm in 2006 | 35 |
| April | 31.1°C19 Apr 2013 | -6.7°C4 Apr 2013 | 66 mm12 Apr 2024 | 200 mm2024 · driest 35 mm in 2016 | 35 |
| May | 34.4°C31 May 2007 | -1.7°C1 May 2018 | 53 mm29 May 2000 | 185 mm2019 · driest 37 mm in 2002 | 35 |
| June | 37.2°C26 Jun 1999 | 5.0°C3 Jun 2025 | 152 mm18 Jun 2009 | 179 mm2009 · driest 12 mm in 1992 | 35 |
| July | 38.9°C15 Jul 1995 | 9.4°C7 Jul 1992 | 102 mm29 Jul 1999 | 216 mm1992 · driest 21 mm in 1995 | 35 |
| August | 38.9°C13 Aug 1995 | 8.3°C30 Aug 2025 | 75 mm7 Aug 2000 | 164 mm2007 · driest 16 mm in 2025 | 34 |
| September | 35.6°C11 Sep 2013 | 2.8°C30 Sep 1992 | 104 mm30 Sep 2015 | 212 mm2018 · driest 19 mm in 2017 | 35 |
| October | 32.8°C2 Oct 2019 | -3.3°C20 Oct 1992 | 60 mm30 Oct 2012 | 157 mm2019 · driest 9 mm in 1991 | 35 |
| November | 26.7°C3 Nov 2016 | -11.1°C25 Nov 2005 | 50 mm12 Nov 2022 | 163 mm1997 · driest 20 mm in 2012 | 35 |
| December | 23.9°C5 Dec 1999 | -16.7°C22 Dec 2008 | 70 mm1 Dec 2010 | 141 mm2012 · driest 22 mm in 1992 | 35 |
| Month | Days 25°C+ | Days 30°C+ | Frost nights | Heavy rain (10 mm+) | Snow days |
|---|---|---|---|---|---|
| January | 0 | 0 | 21 | 3 | 3 |
| February | <1 | 0 | 19 | 2 | 2 |
| March | <1 | 0 | 15 | 3 | <1 |
| April | 4 | <1 | 4 | 3 | 0 |
| May | 12 | 3 | <1 | 3 | 0 |
| June | 23 | 9 | 0 | 3 | 0 |
| July | 27 | 14 | 0 | 3 | 0 |
| August | 27 | 13 | 0 | 3 | 0 |
| September | 16 | 5 | 0 | 2 | 0 |
| October | 5 | <1 | 1 | 2 | 0 |
| November | <1 | 0 | 11 | 2 | <1 |
| December | 0 | 0 | 19 | 2 | 2 |
| Month | Dry days reaching 20°C | Wet days | Days with heavy rain | Weeks with 3+ wet days | Typical high by year |
|---|---|---|---|---|---|
| January | <1% | 35% | 8% | 48% | -0.2–6.6°C |
| February | 1% | 31% | 8% | 40% | 1.5–8.8°C |
| March | 9% | 32% | 9% | 42% | 7.7–13.7°C |
| April | 26% | 36% | 11% | 45% | 15.2–19.9°C |
| May | 51% | 33% | 10% | 42% | 20.3–25.9°C |
| June | 67% | 30% | 10% | 35% | 25.3–28.9°C |
| July | 72% | 28% | 11% | 30% | 27.5–31.0°C |
| August | 74% | 26% | 10% | 24% | 27.0–30.2°C |
| September | 70% | 25% | 8% | 26% | 23.4–27.8°C |
| October | 34% | 26% | 8% | 28% | 16.5–20.8°C |
| November | 8% | 27% | 8% | 32% | 9.1–15.0°C |
| December | <1% | 31% | 7% | 40% | 3.1–9.3°C |
A dry day reaching 20°C records under 1 mm of rain. A wet day records at least 1 mm, while a heavy-rain day records at least 10 mm. The weekly figure is the share of seven-day periods containing three or more wet days. The final column shows the middle 80% of average daytime highs recorded for that month in individual years; a wider range means conditions have varied more from one year to another.
The evidence behind this page
Where these figures
come from.
- Place identity
- GeoNames 5206379
- NOAA station
- USC00362574 · EMSWORTH L/D OHIO RVR
- Station distance
- 10.6 km from the place centre
- Climate period
- 1991–2020
- Minimum month coverage
- 28 usable years
- Daylight
- Calculated from latitude 40.44°, mid-month, sunrise to sunset including refraction. Not a station measurement.
- Important limit
- Historical climate is not a forecast. Nearby stations can miss mountains, coasts, and local microclimates.
Next step
Choose your month.
Then plan the details.
The weather comparison for Pittsburgh is based on climate evidence, not payments from travel companies. Flight, accommodation and activity links will be clearly labelled when they are added; there are no booking offers on this page today.
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