National Weather ServicePennsylvaniaHeat AdvisoryArchive to October 1, 2026
Heat Advisories in Pennsylvania
The National Weather Service issued 21 heat advisories for Pennsylvania in 2025 and 13 a year on average in 2008-2025; in 2021-2025 it had the 30th most of any state. 2026 through September: 21, 65% above the average of 13 for those months in 2008-2025. Delaware was covered most often (72 times since 2008).
How many heat advisories does Pennsylvania get?
Every heat advisory that covered part of Pennsylvania. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 21 |
| 2025 | 21 |
| 2024 | 25 |
| 2023 | 10 |
| 2022 | 14 |
| 2021 | 21 |
| 2020 | 10 |
| 2019 | 10 |
| 2018 | 20 |
| 2017 | 5 |
| 2016 | 14 |
| 2015 | 5 |
| 2014 | 2 |
| 2013 | 12 |
| 2012 | 21 |
| 2011 | 18 |
| 2010 | 15 |
| 2009 | 2 |
| 2008 | 4 |
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
When in the year does Pennsylvania get them?
Sum of 2008-2025; the busiest month is labelled.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
Where in Pennsylvania?
| County or forecast zone | Since 2008 | Since 2023 | Last issued |
|---|---|---|---|
| Delaware | 72 | 26 | September 3, 2026 |
| Philadelphia | 72 | 26 | September 3, 2026 |
| Berks | 68 | 18 | September 3, 2026 |
| Eastern Chester | 63 | 28 | September 3, 2026 |
| Lehigh | 63 | 16 | August 6, 2026 |
| Eastern Montgomery | 62 | 26 | September 3, 2026 |
| Lancaster | 62 | 17 | September 3, 2026 |
| Lower Bucks | 61 | 25 | September 3, 2026 |
| Northampton | 61 | 16 | August 6, 2026 |
| York | 61 | 17 | September 3, 2026 |
| Lebanon | 58 | 17 | September 3, 2026 |
| Dauphin | 56 | 16 | September 3, 2026 |
The NWS issues these products for counties or forecast zones; a zone can be part of a county or a mountain range.
Source: Iowa Environmental Mesonet archive of National Weather Service watches, warnings and advisories (VTEC); National Weather Service. Data as of October 1, 2026.
What is a heat advisory?
A heat advisory means heat that can make people ill, especially those without cooling, below the office's extreme heat warning values. An advisory is issued for a hazard less serious than a warning that can still cause inconvenience or danger if people are not careful. The national record · Every warning type in Pennsylvania.