What is the hottest day ever recorded in Philadelphia?

Philadelphia's hottest day on record reached 105°F, set on July 22, 2011. That is the single most extreme high in the nearest long-term weather station's full daily record — about 39°F hotter than a typical year's average high of 66°F, which is why a day like it stands out as genuinely rare rather than just a hot afternoon.

What is the record high temperature in Philadelphia?

The all-time record high in Philadelphia is 105°F, recorded on July 22, 2011. Records are drawn from the nearest long-term weather station's full daily history, so this is the hottest single day the station has ever logged — not a typical summer peak.

What is the coldest day ever recorded in Philadelphia?

Philadelphia's coldest day on record bottomed out at -6°F, set on January 17, 1982. Like the record high, it comes from the station's full daily record, so it captures the most extreme cold the area has recorded rather than an average winter low.

What is the record low temperature in Philadelphia?

The all-time record low in Philadelphia is -6°F, recorded on January 17, 1982. The gap between that and the 105°F record high — a span of 111°F — is the full range of temperatures Philadelphia has experienced across its long-term daily record.

Is it normal to be this hot in Philadelphia?

It depends on how far above Philadelphia's normal a given day runs. A typical year here averages a daily high near 66°F; the all-time record of 105°F (set 2011) sits about 39°F above that. When a live reading is available, the live readout just below the record high and low compares it with the temperature typical for that hour this month (estimated from the month's normal high and low), so you can see how unusual the day is rather than guessing.

When did Philadelphia set its temperature records?

Philadelphia's record high of 105°F was set in 2011 (July 22, 2011), and its record low of -6°F in 1982 (January 17, 1982). Both are pulled from the station's full daily record going back to 1945, so they reflect the true extremes rather than a recent or partial sample.

Has Philadelphia been getting hotter?

Yes — Philadelphia's annual mean temperature has trended about 4.7°F warmer since 1958 (+0.73°F per decade, fitted to the complete years of 1958–2023). That gradual shift in the average is separate from the all-time records above, which mark the single most extreme days rather than the trend, but a warming baseline is part of why recent years more often brush up against the record-high end.

Philadelphia, Pennsylvania Weather Records

The hottest and coldest days Philadelphia has ever recorded — and how today compares to normal

Philadelphia’s all-time temperature records

Hottest day on record: 105°Fset July 22, 2011
Coldest day on record: -6°Fset January 17, 1982

That is a 111°F span between the hottest and coldest days Philadelphia has ever recorded — the full range of what its weather has done across the station’s record back to 1945.

Philadelphia, PA · Today vs. normal

3°F below typical for 4:00 PM on Sep 20

At 4:00 PM EDT on Sep 20 it was 74°F in Philadelphia — 3° below the 77°F typical for that hour (estimated from the Sep 20 normal high of 77°F and low of 58°F, interpolated from the monthly normals).

How extreme Philadelphia’s weather gets

Philadelphia’s weather is usually mild by its own standards — a typical year averages a daily high near 66°F, and the normal high for September runs about 79°F. The records sit well outside that everyday range. The hottest day on record reached 105°F in 2011 — roughly 39°F above a typical year’s average high, the kind of gap that turns an ordinary summer into a genuine heat event.

At the other end, Philadelphia has bottomed out at -6°F (1982). Those edges are why the today-versus-normal readout above is worth a glance: it shows where today falls between the normal and the record, so a hot afternoon can be judged against the real history rather than a hunch. A reading a few degrees over the September normal is ordinary; one pushing toward the 105°F record is the rare event the record marks.

Frequently asked

What is the hottest day ever recorded in Philadelphia?: Philadelphia's hottest day on record reached 105°F, set on July 22, 2011. That is the single most extreme high in the nearest long-term weather station's full daily record — about 39°F hotter than a typical year's average high of 66°F, which is why a day like it stands out as genuinely rare rather than just a hot afternoon.
What is the record high temperature in Philadelphia?: The all-time record high in Philadelphia is 105°F, recorded on July 22, 2011. Records are drawn from the nearest long-term weather station's full daily history, so this is the hottest single day the station has ever logged — not a typical summer peak.
What is the coldest day ever recorded in Philadelphia?: Philadelphia's coldest day on record bottomed out at -6°F, set on January 17, 1982. Like the record high, it comes from the station's full daily record, so it captures the most extreme cold the area has recorded rather than an average winter low.
What is the record low temperature in Philadelphia?: The all-time record low in Philadelphia is -6°F, recorded on January 17, 1982. The gap between that and the 105°F record high — a span of 111°F — is the full range of temperatures Philadelphia has experienced across its long-term daily record.
Is it normal to be this hot in Philadelphia?: It depends on how far above Philadelphia's normal a given day runs. A typical year here averages a daily high near 66°F; the all-time record of 105°F (set 2011) sits about 39°F above that. When a live reading is available, the live readout just below the record high and low compares it with the temperature typical for that hour this month (estimated from the month's normal high and low), so you can see how unusual the day is rather than guessing.
When did Philadelphia set its temperature records?: Philadelphia's record high of 105°F was set in 2011 (July 22, 2011), and its record low of -6°F in 1982 (January 17, 1982). Both are pulled from the station's full daily record going back to 1945, so they reflect the true extremes rather than a recent or partial sample.
Has Philadelphia been getting hotter?: Yes — Philadelphia's annual mean temperature has trended about 4.7°F warmer since 1958 (+0.73°F per decade, fitted to the complete years of 1958–2023). That gradual shift in the average is separate from the all-time records above, which mark the single most extreme days rather than the trend, but a warming baseline is part of why recent years more often brush up against the record-high end.