If you plan to visit Pittsburgh in September, the weather is typically alright, with an average high temperature of +75°F during the day and approximately 8 sunny days. Expect some rainy, though, as there are typically 15 rainy days in the month and around 98 mm of precipitation. The weather is changeable so you may have to pack for every eventuality. Search flightsin one click on Avionero.
Good to know:
September is usually the wettest month of the year in Pittsburgh;
Average weather
☀️
+75°F
Avg. max. temperature
+36°F
Min.
+95°F
Max.
98 mm
Total precipitation
77%
Avg. humidity
2 m/s
Avg. wind
8 ☀️
Sunny Days
8 ⛅️
Cloudy
15 🌦
Rainy
Our opinion: Pittsburgh has OK weather in September.
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Average temperature in Pittsburgh in September
Here are the expected maximum, average and minimum temperatures in Pittsburgh for September based on the historical data.
Last Year
Historical Data
Going from a maximum of +91°F during the day to a minimum of +48°F during the night, the temperature in September averages around +77°F.
The average maximum temperature goes down 8% by the end of the month, compared with the beginning of the month, from +81°F to +77°F.
Is Pittsburgh warm or cold in September?
Pittsburgh is typically warm in September.
Maximum temperatures go down compared to the previous month from +82°F to +75°F. The minimum temperature also goes down from +64°F to +57°F.
It’s generally warm, but pack a long-sleeve shirt for evenings.
Take a look at how September is compared to other months in Pittsburgh:
Climate in Pittsburgh in September
Pittsburgh weather looks like this, on average, in September and the surrounding months.
August
September
October
Avg. temperature
+82°F
+75°F
+64°F
Min. temperature
+41°F
+36°F
+25°F
Max. temperature
+99°F
+95°F
+90°F
Rainfall
93 mm
98 mm
89 mm
Wind
2 m/s
2 m/s
2 m/s
Humidity
76%
77%
75%
Air pressure
1016 HPa
1017 HPa
1017 HPa
Sunny days
5
8
7
Cloudy days
7
8
9
Rainy days
18
15
15
Snowy days
0
0
0
September weather is still as ok as in August.It’s getting colder in September. From +82°F in the day, the average maximum temperature lowers to +75°F.Prepare for more rain. Average rainfall goes from 93 mm to 98 mm.Humidity rises from 76% to 77%.The average wind speed doesn’t change much during September, staying around 2 m/s.The good news is there are likely to be more sunny days in September, from 5 to 8.
October brings much the same weather, it remains ok.
Wind speed in Pittsburgh in September based on historical data.
Last Year
Historical Data
The average wind speed is 2 m/s getting up to 3 m/s which is a light breeze; barely moving the tree leaves.
The average wind speed in Pittsburgh is gradually decreasing during September, going from 2 m/s to 1 m/s over the course of the month.
Rain
Amount of rainfall in mm during September in Pittsburgh based on historical data.
Last Year
Historical Data
Typically, there is a 43% chance of rain on an average day in September, with total rainfall of approximately 78 mm. The maximum amount of rainfall per day is around 20 mm, which is considered light rain.September is a pretty wet month with over 13 rainy days, so don’t forget to pack an umbrella, raincoat, and a pair of wellies.
Here’s how September is compared with other months in the amount of precipitation, total mm:
Pittsburgh wettest month is May, where a typical day has a 61% chance of precipitation and 124 mm of rainfall per day. February, on the other hand, is the driest month with a mere 24% chance of precipitation and 54 mm of rainfall per day.
How was the weather last September in Pittsburgh?
This is the weather in Pittsburgh in September 2023:
1 September
☀️
+81°F
2 September
☀️
+86°F
3 September
☁️
+89°F
4 September
☁️
+91°F
5 September
☀️
+91°F
6 September
☀️
+92°F
7 September
🌧️
+84°F
8 September
🌧️
+81°F
9 September
🌧️
+76°F
10 September
☁️
+77°F
11 September
☁️
+79°F
12 September
☀️
+80°F
13 September
🌧️
+76°F
14 September
☀️
+72°F
15 September
☀️
+74°F
16 September
☀️
+76°F
17 September
🌧️
+69°F
18 September
🌧️
+72°F
19 September
☀️
+70°F
20 September
☁️
+75°F
21 September
☀️
+80°F
22 September
☀️
+76°F
23 September
☀️
+66°F
24 September
🌫️
+64°F
25 September
☁️
+69°F
26 September
☁️
+67°F
27 September
☁️
+74°F
28 September
🌧️
+71°F
29 September
🌧️
+78°F
30 September
☀️
+78°F
In September 2023 Pittsburgh had 13 sunny days, 8 cloudy days, and 8 rainy days. The average maximum temperature was +77°F, with an absolute maximum of +91°F and a minimum of +64°F. The average humidity was 77%, with a maximum of 100% and a minimum of 39%. The average wind speed was 2 m/s, with a maximum of 6 m/s and a minimum of 0 m/s.
Are you planning a trip in September?
Climate Change Over the Years
This is how Pittsburgh climate has changed over the last 43 years.
The climate in Pittsburgh in September has not changed that much over the last 43 years.
The average temperature was the lowest in 1979 (+59°F) and the highest in 2012 (+66°F). The driest year was 1988 with only 782 mm of rainfall, and the wettest year was 2019 with 2006 mm.
FAQ
Frequently asked questions about the weather in Pittsburgh in September:
Is September a good time to visit Pittsburgh?
It’s always a good time to visit Pittsburgh, but the weather is changeable in September, so plan a mix of indoor and outdoor activities and exploring, and pack for every eventuality.
Can you sunbathe in Pittsburgh in September?
September is warm in Pittsburgh. You may enjoy some beach or pool time in the day, but pack something a tad warmer for the evening.
Is Pittsburgh rainy in September?
Pittsburgh is often rainy in September. You may get a bit damp when outside, so pack an umbrella, and maybe even a raincoat.
Is it sunny in Pittsburgh in September?
Usually, it’s not very sunny in Pittsburgh in September, often it’s pretty cloudy. Pack for any eventuality; layering can help reduce the number of bulky items needed.
For this page, we’ve looked at the typical weather in Pittsburgh, based on historical hourly weather data from January 1, 1979, to December 31, 2023.
For past dates, we show actual recorded data at the location at that time. Forecasts are based on recorded weather during that day of the year, averaged over the total years for which we have records (unless stated otherwise). The daily temperature is the highest recorded temperature in the shadow during that day.
