Philadelphia’s fourth heat wave of the year is intensifying, and the worst is still ahead. Wednesday’s high of 97 degrees kicked off day three of what forecasters expect to be a seven-day stretch of dangerous heat.
Thursday and Friday bring the peak: highs of 103 to 105 degrees, with heat index values reaching 110 to 115 in the Delaware Valley. Pop-up thunderstorms are possible Friday and Saturday evenings, some carrying gusty winds, hail and heavy rain.
The timing is especially risky. Saturday falls on the Fourth of July, the same day Philadelphia Stadium hosts the final Men’s World Cup match of 2026. Large outdoor crowds and peak heat will collide, and doctors warn that headaches, fatigue and dizziness are early signs of heat illness that require immediate cooling down.
Heat kills more people in the U.S. each year than any other weather event.
How To Stay Safe
Health officials recommend finding somewhere cool to rest, checking on elderly neighbors and family members, and limiting time outdoors during peak hours. Pools, movie theaters and shopping malls offer air-conditioned relief. Cars are especially dangerous: interior temperatures can climb past 125 degrees within minutes, and no person or pet should ever be left inside one, even briefly.
Philadelphia Heat Records Since 1894
| Record | Detail |
|---|---|
| 100-degree days since 1894 | 64 days (per NWS) |
| Most recent 100-plus day | June 24, 2025 — only one in 14 years |
| All-time hottest day | 106°F, Aug. 7, 1918 |
| Hottest July temperature | 104°F, July 3, 1966 |
| Back-to-back 100-degree days | 14 times — last in July 2011 |
| Three straight 100-degree days | Twice — July 1993 and July 1966 |
| Four straight 100-degree days | Never recorded |
| Record being chased: July 1 | 102°F (1901) |
| Record being chased: July 2 | 103°F (1901) |
| Record being chased: July 3 | 104°F (1966) |
7-Day Forecast
| Day | Conditions | High | Low |
|---|---|---|---|
| Thursday | NEXT Weather Alert | 104°F | 79°F |
| Friday | NEXT Weather Alert | 105°F | 82°F |
| Saturday | NEXT Weather Alert | 102°F | 82°F |
| Sunday | NEXT Weather Alert | 94°F | 79°F |
| Monday | Heat breaks | 86°F | 74°F |
| Tuesday | Partly cloudy | 85°F | 72°F |
| Wednesday | Partly cloudy | 89°F | 72°F |
Relief Is Coming, Just Not Yet
The heat holds through Saturday before easing. Sunday’s high drops to 94, and by Monday the heat wave breaks entirely, with highs in the mid-80s continuing into the following week.
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