15-Day Weather Forecast - Philadelphia

15-day weather forecast for Philadelphia: temperatures from 14°C (57°F) to 32°C (90°F). Average daily high 26°C (79°F) over the next 15 days.

Hourly Forecast by Day

Today·11 Sep
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Temperature · peaks at +29°C

15-Day Temperature Trend

29°22°TodaySep28°17°Tmrw28°22°Sun24°18°Mon25°14°Tue28°17°Wed30°18°Thu32°21°Fri31°20°Sat21°17°Sun17°15°Mon18°16°Tue19°15°Wed27°16°Thu26°15°Fri
Colour scale for daily high temperature bars

15-Day Weather Forecast

Updated just now
  • Date
    High / Low
  • Fri, Sep 11Today
    +29°/+22°
    feels +30°0 mm · 20%11 km/hUV 5 · Mod
    06:3719:15
  • Sat, Sep 12Tomorrow
    +28°/+17°
    feels +28°0 mm · 50%17 km/hUV 6 · Mod
    06:3819:14
  • Sun, Sep 13Sun
    +28°/+22°
    feels +31°65.0 mm · 83%13 km/hUV 5 · Mod
    06:3919:12
  • Mon, Sep 14Mon
    +24°/+18°
    feels +26°0.5 mm · 5%21 km/hUV 6 · Mod
    06:4019:10
  • Tue, Sep 15Tue
    +25°/+14°
    feels +24°13 km/hUV 6 · Mod
    06:4119:09
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  • Wed, Sep 16Wed
    +28°/+17°
    feels +29°0 mm · 4%13 km/hUV 6 · Mod
    06:4219:07
  • Thu, Sep 17Thu
    +30°/+18°
    feels +30°0 mm · 22%11 km/hUV 6 · Mod
    06:4319:05
  • Fri, Sep 18Fri
    +32°/+21°
    feels +34°0 mm · 22%15 km/hUV 5 · Mod
    06:4419:04
  • Sat, Sep 19Sat
    +31°/+20°
    feels +32°5.1 mm · 18%19 km/hUV 6 · Mod
    06:4519:02
  • Sun, Sep 20Sun
    +21°/+17°
    feels +19°1.2 mm · 18%19 km/hUV 4 · Mod
    06:4619:00
  • Mon, Sep 21Mon
    +17°/+15°
    feels +17°8.7 mm · 13%20 km/hUV 1 · Low
    06:4718:59
  • Tue, Sep 22Tue
    +18°/+16°
    feels +19°3.6 mm · 13%12 km/hUV 1 · Low
    06:4818:57
  • Wed, Sep 23Wed
    +19°/+15°
    feels +19°5.7 mm · 17%13 km/hUV 2 · Low
    06:4918:56
  • Thu, Sep 24Thu
    +27°/+16°
    feels +27°0 mm · 23%11 km/hUV 6 · Mod
    06:5018:54
  • Fri, Sep 25Fri
    +26°/+15°
    feels +28°6.9 mm · 21%19 km/hUV 3 · Mod
    06:5118:52

Weather Insight

Philadelphia's 15-day outlook ranges from a low of 14°C to a high of 32°C, with an average daytime high near 26°C. Air quality is currently Moderate (AQI 53), driven mainly by PM2.5 at 9.4 μg/m³.

Today vs Normal

29°C+3° above normal

The long-term average high for today is 26°C.

16 of the last 28 days with published data ran above normal.

It continues that pattern - today's forecast is also running above normal.

2026-08-28: 29°C29°2026-08-29: 26°C26°2026-08-30: 29°C29°2026-08-31: 27°C27°2026-09-01: 32°C32°2026-09-02: 24°C24°2026-09-03: 31°C31°2026-09-04: 30°C30°2026-09-05: 27°C27°2026-09-06: 26°C26°2026-09-07: 27°C27°2026-09-08: 28°C28°

Red = above normal, blue = at or below · last 12 days

Air Quality

Air Quality
Moderate

Air quality is acceptable for most people. Unusually sensitive individuals should consider reducing prolonged or heavy outdoor exertion.

Extended Outlook for Philadelphia

Over the next 15 days, Philadelphia is forecast to see temperatures ranging from 14°C to 33°C, averaging a daily high of 26°C. The extended outlook indicates significant rainfall totalling 96.7 mm spread across 8 days. Conditions are suitable for most outdoor activities; carry an umbrella on days with showers.