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Philadelphia Half Marathon weather

What will race morning in Philadelphia cost you?

Philadelphia Half Marathon mornings around race day since 2021, by weather-model estimate: about 39°F (4°C) at 07:00 near Philadelphia. Most were 29 to 50°F. Live forecast at 07:00: Saturday 21 November 49°F (10°C).

Date
Sat, 21 Nov 2026
First start
07:00 local
Distance
13.1 mi
Mornings around race day at 07:00, by year
YearAirDew ptWindRain hrs
202542°F35°F6 mph18%
202444°F37°F8 mph27%
202339°F32°F6 mph0%
202233°F24°F7 mph9%
202136°F29°F6 mph9%

By weather-model estimate near the race, mornings around race day. Not station readings.

Course note

The Philadelphia Half Marathon starts on Benjamin Franklin Parkway and runs through Old City, University City and Fairmount Park before finishing near the Art Museum. Organiser route

Live race-morning forecast07:00 · 8 days to go
2:00:002:01 to 2:02Edit goal

49°F at the gundew point 44°Fwind 5 mph NE, gusts 16

01 · The conditions

Race-day weather

49°F

07:00 in Philadelphia
21 November 2026 · 8 days to go

dew point
44°
humidity
84%
mph wind, NE, gusts 16
5
Hour by hour · your time on course lit · tap an hour

Forecast for 21 November 2026, America/New_York. Open-Meteo, refreshes about hourly. City-level conditions; exposure varies along the course. The advertised first start is 07:00; check your assigned wave.

Example RunWeather race plan for a hot half marathon in Florida: goal pace against race-day pace, and how to spend it from start to finish

Example race: a hot half marathon in Florida

Powered by StravaWorks with Apple Health

Get Philadelphia race-morning weather on your phone.

The app turns race-morning weather into your race plan: your goal pace, your race-day pace, and how to spend it from the start to the finish.

Example RunWeather race plan for a hot half marathon in Florida: what slows you, heat and wind in minutes, then conditions from gun to finish

Example race: a hot half marathon in Florida

02 · Same effort, different day

What the weather may cost your goal

Goal finish time

Choose a popular time or set your own. Your pace and weather preview update as you edit.

Your goal pace9:09/mi · 2:00:00 finish
Same effort in this weather2:01:12+1:12 07:00 to 09:00 · forecast

2:00:00 goal. On the race-day forecast, expect about 2:01 to 2:02. Main factor: wind.

  • Heat and sun0%
  • Wind and comfort+1%
  • Weather total+1%

RunWeather’s pace model at your goal effort, over every hour you are on course (07:00 to 09:00 local), weighted by the time you spend in each, using the live city forecast. A planning preview, not a predicted finish. Hills, turns, shelter, fuelling and heat adaptation are not modelled here; rain is left out because a probability is not a measured rain rate. Explore the heat pace calculator.

View even-pace checkpoints
DistanceElapsed time
3.1 mi0:28:26
6.2 mi0:56:53
9.3 mi1:25:19
12.4 mi1:53:45
13.1 mi · Finish2:00:00

In the app

Your race plan, on race morning

Add the Philadelphia Half Marathon and the app keeps your plan current until the gun.

  • Goal pace against race-day pace

    What your goal is worth on this morning’s weather, per mi and at the finish.

  • How to spend it

    Start, middle and finish, against your average.

  • What slows you

    Heat, wind and hills, each in minutes.

Example RunWeather race plan for a hot half marathon in Florida: goal pace against race-day pace, and how to spend it from start to finish

Goal vs race day

Example RunWeather race plan for a hot half marathon in Florida: what slows you, heat and wind in minutes, then conditions from gun to finish

What slows you

Example race: a hot half marathon in Florida

Reference

Everything else about race morning

Open any row for the full detail.

  • The course13.1 mi

    The Philadelphia Half Marathon starts on Benjamin Franklin Parkway and runs through Old City, University City and Fairmount Park before finishing near the Art Museum.

    RACE MORNING AT 07:002021–2025
    29–50°F

    Where most starts fell, in the weather near Philadelphia around race day. Not a forecast.

    AVERAGE
    39°F
    HUMIDITY
    75%
    WIND
    6 mph
    No course map yetOrganiser route
    01

    The half marathon is on Saturday; use its forecast rather than Sunday’s full-marathon conditions.

    02

    Compare the conditions at your start and expected finish before settling on kit and effort.

    03

    Confirm late changes to the route, start wave and logistics with the organiser.

    Official race site ↗
  • Race-window historyLast 5 years, race date ±5 days

    A range for planning Philadelphia Half Marathon: weather near Philadelphia on race morning, the last 5 years (2021 to 2025, race date ±5 days). Not a forecast.

    Typical start-hour air39°F10th–90th percentile 29°F–50°F
    Dew point / humidity31°F75% relative humidity
    Start-hour wind6 mphDirection varies by day
    Hours with rain13%Historical frequency at this hour
    AIR THROUGH THE RUN

    The five-year picture

    39°F → 49°F by +4h
    07:00
    Air temperature
    39°F
    Humidity
    75%
    Wind
    6 mph
    Hours with rain
    13%
    24°F38°F52°F66°FStartGoal finish07:0009:0011:0013:00

    Hover or drag to explore. Use ← → when focused. Shading: middle 80% of sampled temperatures.

    Five-year average Middle 80% of sampled hours

    The sampled air warms by about 10°F across four hours. Check your expected finish-hour forecast, not just the start.

    WIND CONTEXT

    Where the breeze came from

    NN: 4 of 55 sampled start hours; mean 6 mphNENE: 5 of 55 sampled start hours; mean 6 mphEE: 2 of 55 sampled start hours; mean 3 mphSESE: 0 of 55 sampled start hours; mean 0 mphSS: 3 of 55 sampled start hours; mean 4 mphSWSW: 9 of 55 sampled start hours; mean 5 mphWW: 14 of 55 sampled start hours; mean 8 mphNWNW: 18 of 55 sampled start hours; mean 7 mph
    WIND FROMNW

    18 of 55 samples · 33%
    Mean 7 mph

    The petals show how often the wind came from each direction at the sampled start hour. They do not predict the direction on race day.

    A city-point wind rose cannot tell you which parts of the course will be sheltered or exposed. Use the live forecast and the organiser’s route map together.

    Method: 55 ERA5 hourly samples at 07:00 local time, across 11 calendar days per year in 2021–2025. The sample uses the hour containing the advertised first start; waves may start later. Grid weather is modelled reanalysis, not an on-course station reading. Open-Meteo Historical Weather API . Data generated 2026-10-28.

  • November climateAll-hours monthly averages

    November averages in Philadelphia, from 2022 to 2024. These are monthly conditions, not a race-day forecast.

    mean temperature
    48°F
    mean humidity
    66%
    mean wind
    7 mph
    hours with rain
    8%

    Monthly, all-hours averages for Philadelphia, 2022–2024. Not past race-day measurements or a forecast. Rain is the share of historical hours with precipitation, not the chance of rain on race day. Source: Open-Meteo ERA5.

    Explore running weather in Philadelphia
  • Philadelphia Half Marathon FAQs7 questions

    When is the 2026 Philadelphia Half Marathon?

    Philadelphia Half Marathon is listed for 21 November 2026. Confirm the latest details on the official event website before travelling.

    Is the weather shown a forecast for the Philadelphia Half Marathon?

    Only from about 14 days before the race, when the page shows the live race-day forecast. Before that, you see the weather near the city on the mornings around race day in the last 5 years: what is typical, not what will happen. Monthly averages, when shown, cover every hour of the race month.

    What is race morning usually like at the Philadelphia Half Marathon?

    Around the 07:00 start, mornings around race day near Philadelphia in the last 5 years averaged 39°F (4°C), 75% humidity and 10 km/h wind. Most started between 29°F and 50°F. This is weather near the city, not a reading from the race itself or a forecast.

    Which recent year had the warmest race morning at the Philadelphia Half Marathon?

    2024. Around race day that year it was about 44°F (7°C) around the 07:00 start, against 39°F (4°C) on an average year.

    Which recent year had the windiest race morning at the Philadelphia Half Marathon?

    2024, with about 12 km/h of wind around the 07:00 start. Over the last 5 years the wind here came mostly from the north-west.

    How should I pace the Philadelphia Half Marathon on a warm day?

    2:00:00 goal. On a typical race morning here, expect about 2:00 to 2:05. Main factor: cold. If race day comes in warmer, start a little easier than goal pace, run by feel to halfway and drink early. Plan my race gives your splits for the day.

    Can past years predict the weather on race day at the Philadelphia Half Marathon?

    No. They show what race morning is usually like, not what this year will bring. Check the live forecast in the last 14 days, look at the hours through your expected finish, and follow the organiser for start and course updates.

  • Sources and race informationOrganiser, weather data, guide reviewed 2026-09-22

    Past race-morning weather: Open-Meteo Historical Weather API, weather near the city from 2021 to 2025, updated 2026-10-28. Not official race-day readings.

    Guide reviewed . RunWeather is an independent guide, not the race organiser. Dates, waves and routes can change; the organiser’s latest instructions take priority.

Philadelphia race morning, on your phone.

Free on iPhone and Android. Your race plan, updated with the forecast until the gun.

Example RunWeather race plan for a hot half marathon in Florida: goal pace against race-day pace, and how to spend it from start to finish

Example race: a hot half marathon in Florida