National Weather ServicePennsylvaniaExtreme Heat WatchArchive to October 1, 2026
Extreme Heat Watches in Pennsylvania
The National Weather Service issued 6 extreme heat watches for Pennsylvania in 2025 and 4 a year on average in 2008-2025; in 2021-2025 it had the 20th most of any state. 2026 through September: 4, 14% above the average of 4 for those months in 2008-2025. Philadelphia was covered most often (40 times since 2008).
How many extreme heat watches does Pennsylvania get?
Every extreme heat watch that covered part of Pennsylvania. 2026 is an outline: the year is not over.
The numbers
| Year | Count |
|---|---|
| 2026 (through September) | 4 |
| 2025 | 6 |
| 2024 | 7 |
| 2023 | 1 |
| 2022 | 1 |
| 2021 | 2 |
| 2020 | 1 |
| 2019 | 6 |
| 2018 | 1 |
| 2017 | 1 |
| 2016 | 6 |
| 2015 | 0 |
| 2014 | 0 |
| 2013 | 3 |
| 2012 | 7 |
| 2011 | 9 |
| 2010 | 8 |
| 2009 | 1 |
| 2008 | 3 |
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 |
|---|---|---|---|
| Philadelphia | 40 | 8 | July 15, 2026 |
| Delaware | 40 | 8 | July 15, 2026 |
| Lower Bucks | 21 | 8 | July 15, 2026 |
| Eastern Montgomery | 21 | 8 | July 15, 2026 |
| Montgomery | 19 | 0 | July 16, 2012 |
| Chester | 19 | 0 | July 16, 2012 |
| Bucks | 19 | 0 | July 16, 2012 |
| Eastern Chester | 18 | 6 | July 1, 2026 |
| Northampton | 13 | 5 | July 1, 2026 |
| Lehigh | 13 | 5 | July 1, 2026 |
| Berks | 13 | 5 | July 1, 2026 |
| Western Montgomery | 12 | 5 | July 1, 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 an extreme heat watch?
An extreme heat watch means dangerous heat is possible in the coming days. It replaced the excessive heat watch in 2025. A watch means the conditions for the hazard are possible or favourable, but it is not yet happening: be ready to act if a warning follows. AreaZine's counts include the excessive heat watches issued before the change. The national record · Every warning type in Pennsylvania.