Philadelphia, Pennsylvania Weather
Apples hang heavy on the branch. Day 93 of summer. Read this microseason across nine climate regions →
Philadelphia weather forecast — hour by hour, 7-day outlook, NOAA radar
Conditions updated 9:25 AM EDT · Open-Meteo
- TodaySep 21Overcast60%0.17″69°63°—
- TuesdaySep 22Light Drizzle33%0.03″64°57°-5°
- WednesdaySep 23Overcast21%—67°57°+3°
- ThursdaySep 24Overcast——67°53°0°
- FridaySep 25Overcast38%—73°52°+6°
- SaturdaySep 26Clear35%—75°56°+2°
- SundaySep 27Clear20%—78°58°+3°
Air quality now AQI 51 · Moderate
AQI 51 (Moderate), driven by PM2.5. AQI flat over the last 6 hours (within ±3 points).
OK No precautions needed for the general population; unusually sensitive individuals may consider limiting prolonged outdoor exertion.
Trends
Seven days of AQI and PM2.5.
Hourly air-quality data from the Copernicus Atmosphere Monitoring Service, charted across the past and next several days. Dashed lines mark the AQI breakpoints at 50 (Good → Moderate) and 100 (Moderate → Unhealthy for Sensitive Groups).
September dries up ditches or breaks down bridges.
- Moonrise
- 4:32 PM
- Moonset
- 1:19 AM
- In sign
- ♑︎ Capricorn
Apples hang heavy on the branch
Read this microseason across nine climate regions →
All 72 microseasons on the year wheel →
Philadelphia at a glance
- Today vs. normal: Today averages 66°F (high 69°F, low 63°F), about the 67°F normal for Sep 21
- Last frost: March 30 (1991–2020 median, NOAA station 6 km away)
- Microseason: Sep 21–25
- Planting calendar: September — plant beans, squash, fall brassicas, carrots; harvest tomatoes, peppers, beans, summer squash, winter squash
16-Day Forecast — Philadelphia
- Mon69°63°60%
- Tue64°57°33%
- Wed67°57°21%
- Thu67°53°7%
- Fri73°52°38%
- Sat75°56°35%
- Sun78°58°20%
- Mon80°61°8%
- Tue76°63°11%
- Wed80°62°14%
- Thu79°65°14%
- Fri75°61°15%
- Sat77°60°16%
- Sun76°63°23%
- Mon72°57°19%
- Tue63°50°20%
Forecast data from Open-Meteo (CC BY 4.0).
Live wind & temperature near Philadelphia
Interactive wind and temperature map centered on Philadelphia — it loads in your browser. Open the full weather map.
Right now in the garden
Late season
As of September 21, the first frost (around November 17) is about 8 weeks away. Frost-tender plants keep producing until then. This city's planting calendar for September: plant beans, squash, fall brassicas, and carrots; harvest tomatoes, peppers, beans, summer squash, and winter squash.
Sun & seasons in Philadelphia
Philadelphia sits in Philadelphia County, where the year’s longest day runs 15h 1m of daylight and its shortest just 9h 19m — a swing of +5h 42m between the June and December solstices. Clocks spring forward on Sunday, March 8, 2026 and fall back on Sunday, November 1, 2026.
Philadelphia is the state’s largest city. The nearest town Philadelphia tracks is Trumbauersville, roughly 31 miles to the NNW.
Air quality in Philadelphia
Air quality in Philadelphia’s county has trended dirtier since 2020; its cleanest year on record was 2020 (median AQI 47). See the full air-quality history for Philadelphia.
Planting calendar
| Month | Plant | Harvest |
|---|---|---|
| March | lettuce, peas, spinach, radishes | — |
| April | lettuce, peas, spinach, radishes | lettuce, spinach, radishes |
| May | tomatoes, peppers, beans, squash | lettuce, peas, spinach, radishes |
| June | tomatoes, peppers, beans, squash | lettuce, peas, spinach, garlic |
| July | tomatoes, peppers, beans, squash | tomatoes, peppers, beans, summer squash, garlic |
| August | tomatoes, peppers, beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| September | beans, squash, fall brassicas, carrots | tomatoes, peppers, beans, summer squash, winter squash |
| October | garlic (overwinter) | tomatoes, peppers, beans, summer squash, winter squash |
| November | — | tomatoes, peppers, beans, summer squash, winter squash, fall brassicas, carrots |
| December | — | fall brassicas, carrots |
A year in weather
July is Philadelphia's warmest stretch (~77°F) and January its coldest (~31°F); precipitation crests in December at 4.2 inches and ebbs in February to 2.9 inches.
| Month | Mean temp | Precip |
|---|---|---|
| January | 31° | 3.4″ |
| February | 33° | 2.9″ |
| March | 42° | 3.7″ |
| April | 53° | 3.9″ |
| May | 61° | 3.7″ |
| June | 71° | 3.7″ |
| July | 77° | 3.3″ |
| August | 75° | 4.0″ |
| September | 69° | 3.7″ |
| October | 58° | 3.0″ |
| November | 45° | 3.6″ |
| December | 36° | 4.2″ |
Regional context
Similar climates Oak Lane, PA, Melrose Park, PA, Cheltenham Village, PA
By modelled 1991-2020 normals (EC_Earth3P_HR model via Open-Meteo), Philadelphia sees 31°F Januarys and 77°F Julys, a 46°F range, plus around 43.1 inches of precipitation.
Philadelphia's precipitation spreads evenly across the seasons: December peaks at 4.2 inches, while February holds 2.9 inches — no season dominates Philadelphia's rain calendar. It is a balanced pattern Philadelphia shares with places like Oak Lane, PA, Melrose Park, PA and Cheltenham Village, PA.
Philadelphia's growing window opens around March 30, once Philadelphia's overnight lows stop freezing — sow peas, lettuce, spinach, and radishes. Hold Philadelphia's tender crops — tomatoes, peppers, basil — until 10-14 days past Philadelphia's last frost. Around November 17, freezing nights resume in Philadelphia and tender crops must come in. In about half of years, Philadelphia's last freeze comes after March 30.
Similar climates: Oak Lane, PA, Melrose Park, PA, Cheltenham Village, PA, Elkins Park, PA, Bala Cynwyd, PA.
Frequently asked
- When does it freeze in Philadelphia?
- Philadelphia's last spring frost lands near March 30, and in Philadelphia the first fall frost follows around November 17.
- What is the rainy season in Philadelphia?
- Rainfall in Philadelphia peaks in December near 4.2 inches, out of about 43 inches annually.
- What is the warmest month in Philadelphia?
- The warmest stretch in Philadelphia comes in July, around 77°F on average.
- What is the coldest month in Philadelphia?
- On average January is the chilliest month in Philadelphia, about 31°F.
- When can I start a vegetable garden in Philadelphia?
- Time tomatoes in Philadelphia for two weeks after March 30; peas and greens start at Philadelphia's frost line.
- What hardiness zone is Philadelphia?
- Philadelphia's USDA zone comes from its January mean (31°F); enter the ZIP on the USDA lookup for the number.
- What is the 10-day forecast for Philadelphia?
- Philadelphia's extended outlook — daily high and low temperatures and precipitation chances for each upcoming day — is in the daily forecast above.
- Will it rain this week in Philadelphia?
- See this week's day-by-day rain chances for Philadelphia in the daily forecast above, and the next 24 hours in the hourly chart.
- What is the weather like right now in Philadelphia?
- Current conditions for Philadelphia and the next 24 hours — temperature, precipitation chance, and wind by the hour — are in the hourly forecast chart above.
- How often is the Philadelphia forecast updated?
- The Philadelphia forecast on this page is built from Open-Meteo weather-model data and refreshes regularly through the day.
- When are sunrise and sunset in Philadelphia?
- Today's sunrise and sunset times for Philadelphia are in the Almanac section above, along with civil dawn, civil dusk, and day length. Day length is longest near the summer solstice and shortest near the winter solstice.
- How accurate is the weather forecast for Philadelphia?
- The next few days in Philadelphia's forecast are the most reliable; accuracy declines beyond about a week as weather-model uncertainty grows.
Philadelphia sits at 40.0°N; its climate zone is warm-summer humid continental (Köppen approximation).
ZIP codes in Philadelphia
- 19019
- 19092
- 19093
- 19101
- 19102
- 19103
- 19104
- 19105
- 19106
- 19107
- 19108
- 19109
- 19110
- 19111
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- 19170
- 19171
- 19172
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- 19175
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- 19196
- 19197
- 19244
- 19255