City in Pennsylvania, United States
Philadelphia weather by month and the best time to visit
When to go to Philadelphia
Apr–May and Sep–Oct are mild. July–Aug is hot and humid; Dec–Feb is cold with some snow. July 4 and major events raise hotel prices.
Philadelphia weather by month
Average daily high, rainfall and conditions.
- Jan4°78 mm
- Feb5°78 mm
- Mar10°100 mm
- Apr17°97 mm
- May22°96 mm
- Jun27°121 mm
- Jul30°124 mm
- Aug30°121 mm
- Sep26°102 mm
- Oct19°110 mm
- Nov12°90 mm
- Dec6°111 mm
Monthly averages
| Month | High | Low | Rain | Humidity | Conditions |
|---|---|---|---|---|---|
| January | 4°C38°F | -5°C23°F | 78 mm | 84% | Cold |
| February | 5°C41°F | -4°C24°F | 78 mm | 83% | Cold |
| March | 10°C50°F | -1°C31°F | 100 mm | 80% | Cold |
| April | 17°C63°F | 5°C41°F | 97 mm | 78% | Cool |
| May | 22°C72°F | 11°C52°F | 96 mm | 79% | Pleasant |
| June | 27°C81°F | 17°C62°F | 121 mm | 79% | Pleasant |
| July | 30°C86°F | 20°C67°F | 124 mm | 75% | Pleasant |
| August | 30°C85°F | 19°C66°F | 121 mm | 74% | Pleasant |
| September | 26°C79°F | 15°C59°F | 102 mm | 74% | Pleasant |
| October | 19°C67°F | 8°C47°F | 110 mm | 78% | Pleasant |
| November | 12°C54°F | 2°C36°F | 90 mm | 81% | Cool |
| December | 6°C44°F | -2°C28°F | 111 mm | 85% | Cold |
Best months across United States
| Place | Best months | Warmest month |
|---|---|---|
| New York City | Apr–Jun, Sep–Oct | Jul (26°C) |
| Las Vegas | Mar–May, Oct–Nov | Jul (42°C) |
| Los Angeles | Mar–May, Sep–Nov | Aug (32°C) |
| Orlando | Feb–Apr, Nov | May (31°C) |
| Miami | Nov–Apr | Aug (30°C) |
| San Francisco | Apr–May, Sep–Oct | Sep (24°C) |
| Honolulu | Apr–Jun, Sep–Oct | Sep (28°C) |
| Washington, D.C. | Mar–May, Sep–Oct | Jul (31°C) |
| Chicago | May–Jun, Sep–Oct | Jul (25°C) |
| Boston | May–Jun, Sep–Oct | Jul (28°C) |
| New Orleans | Feb–Apr, Oct–Nov | Jul (30°C) |
| San Diego | Apr–May, Sep–Nov | Aug (32°C) |
| Seattle | Jun–Sep | Aug (24°C) |
| Maui | Apr–May, Sep–Oct | Sep (22°C) |
| Nashville | Apr–May, Sep–Oct | Aug (32°C) |
| Austin | Mar–May, Oct–Nov | Aug (36°C) |
| Miami Beach | Nov–Apr | Aug (30°C) |
| Key West | Dec–Apr | Aug (30°C) |
| Denver | May–Jun, Sep–Oct | Jul (33°C) |
| Philadelphia | Apr–May, Sep–Oct | Jul (30°C) |
| Portland | Jun–Sep | Aug (29°C) |
| Atlanta | Mar–May, Oct–Nov | Jul (32°C) |
| San Antonio | Mar–May, Oct–Nov | Aug (36°C) |
| Charleston | Mar–May, Oct–Nov | Jul (32°C) |
| Savannah | Mar–May, Oct–Nov | Jul (33°C) |
| Fort Lauderdale | Dec–Apr | Aug (30°C) |
| Kauai | Apr–Jun, Sep–Oct | Sep (27°C) |
| Big Island | Apr–Jun, Sep–Oct | Aug (26°C) |
| Sedona | Mar–May, Sep–Nov | Jul (35°C) |
| Scottsdale | Feb–Apr, Oct–Nov | Jul (42°C) |
Quick answers
What is the best month to visit Philadelphia?
Apr–May, Sep–Oct. Apr–May and Sep–Oct are mild. July–Aug is hot and humid; Dec–Feb is cold with some snow. July 4 and major events raise hotel prices.
When is the rainy season in Philadelphia?
Rain peaks in July with about 124 mm. No month averages 150 mm or more.
What is the hottest month in Philadelphia?
July, with average highs of 30°C (86°F).
How cold does Philadelphia get?
The coolest nights are in January, averaging -5°C (23°F).
More about Philadelphia
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Sources
Climate averages are modelled from NASA POWER (MERRA-2) for 2001–2020 at about 50 km resolution, so coasts and valleys can differ a little. Compiled and reviewed by SoloSquare. How we compile and score this. Spotted something out of date? Tell us.