Pennsylvania Weather Review: September 2025
Pennsylvania Weather Review: September 2025
The dry pattern from August continued into September but some significant rain finally came to portions of the state late in the month. Take a look back at weather events in Pennsylvania for the month of September 2025.
September was another relatively quiet month. There were just 10 severe weather reports in the state during August and September was not far behind with just 5. However, one of these reports was an EF0 tornado in Quarryville, Lancaster County, on September 4th. This was the 22nd tornado in the state this year and was the first tornado July 1st. The same event brought over 2.50" of rain to the Reading area on the 4th.
Pennsylvania storm report map for September 2025
Temperatures dropped well into the 30s on September 8th and 9th. Being one of the driest locations in the state since late July, Altoona dropped to 35° on September 8th breaking the daily record of 39°. This also is the earliest temperature <=35° on record, 6 days earlier than previously recorded and was the second earliest frost (<=36°).
Low temperatures for the morning of September 8, 2025
Northern Pennsylvania was treated to a glorious display of Northern Lights on the evening of September 14th. Yes, the sky was clear in Pennsylvania for another astronomical event!
The first drought report of the month introduced Moderate Drought to 8% of the state. By the middle of the month, 25% of the state was in Moderate Drought. The report on September 23rd placed half of Pennsylvania in Moderate, Severe, or Extreme Drought. This is the first time ever that there has been Extreme Drought in Beaver County.
 |
 |
Drought Monitors from September 2, 2025 (left) and September 23, 2025 (right).
Scattered and isolated showers brought rain to different portions of southern Pennsylvania on 4 days in a 5 day period from September 16th to 20th. Much more substantial and widespread precipitation came on the 22nd to 25th. The heaviest amounts of over 3 inches fell from southwest PA to northeast PA. The only Flash Flood Warning of the month came on the 23rd in Lancaster County.
72 hour precipitation totals ending 7pm EST on September 25, 2025
The month ended quiet and dry again. There were many days late in the month with high clouds overhead, providing many vivid sunrises and sunsets. Some of the high clouds overhead were courtesy of tropical influences, however the much needed tropical moisture stayed far away from the Commonwealth.
Webcam shots from across the state of the sunset on September 29th.
September Statistics
Temperature anomalies for the month ranged from near average across northwest Pennsylvania and into parts of central Pennsylvania to 3 degrees above average in the southeast. Unsurprisingly, September was very dry for most locations with Pittsburgh and Scranton close to average.
Temperature and precipitation chart for select cities in Pennsylvania for August 2025
For the two month period of August-September, 2025 was the second driest on record in Altoona and Bradford. It was the 3rd driest in Williamsport where records go back 131 years! September was the 6th driest in Bradford and 7th driest for Altoona.
Altoona and Williamsport both recorded just 11 days with measurable precipitation across August AND September! This is tied the 2nd fewest for Altoona with the fewest being 10 in 1985. 11 is the 3rd fewest for Williamsport (Record fewest is 7 in 1908). Altoona also recorded just 1.00" from July 27th to September 24th. This is the 7th driest 60 day period on record for Altoona.
While the month was generally dry, there were some days with locally heavy rain. Allentown, Pittsburgh, and Scranton all recorded the wettest day of the year in the month of September.
Total precipitation for August and September with the ranking. For many locations, this period ranked in the top 10 driest on record.
Wettest Days of 2025.
Map of the highest temperatures of 2025.
Coolest temperatures for the months of August and September.
Webcam Image of the Month
Yes, it is hard to just choose one (That is why I included many more in the summary above). For the Webcam Image of the Month, I chose an image of the one thing we needed this month: Rain! This ominous shot of a storm approaching Kinzers was taken on September 25th.
Webcam image from the Kinzers WeatherBug webcam on 9/25/2025
Looking Ahead
I'm going to be enjoying the nice weather before winter arrives so the blog will be quiet until November unless something crazy happens. Hopefully you too will be able to enjoy the fall weather.
Thanks for reading, and remember to always look up!
Comments
Post a Comment