Austin International Half Marathon weather
What will race morning in Austin cost you?
Austin International Half Marathon mornings around race day since 2021, by weather-model estimate: about 40°F (5°C) at 07:00 near Austin. Most were 26 to 54°F.
- Date
- Sun, 17 Jan 2027
- First start
- 07:30 local
- Distance
- 13.1 mi
| Year | Air | Dew pt | Wind | Rain hrs |
|---|---|---|---|---|
| 2025 | 36°F | 25°F | 8 mph | 0% |
| 2024 | 32°F | 20°F | 10 mph | 9% |
| 2023 | 50°F | 39°F | 7 mph | 9% |
| 2022 | 39°F | 28°F | 8 mph | 0% |
| 2021 | 44°F | 37°F | 7 mph | 0% |
By weather-model estimate near the race, mornings around race day. Not station readings.
Formerly the 3M Half Marathon, the Spurs Austin International Half runs a net downhill route toward downtown Austin. Check the current map and shuttle details. Organiser route
Past starts: 40°F typical, 26 to 54°F since 2021.Live forecast opens 3 January.
01 · The conditions
Race-day weather
Race-day forecasts appear 14 days before the race. Until then, here is what race morning has looked like.
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Example race: a hot half marathon in Florida
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Works with Apple HealthGet Austin race-morning weather on your phone when it opens.
Set up Austin in the app now: your goal, your start, your pace plan. The race-morning forecast lands in it in race week.
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Example race: a hot half marathon in Florida
02 · Same effort, different day
What the weather may cost your goal
2:00:00 goal. On a typical race morning here, expect about 2:00 to 2:05. Main factor: cold.
- Heat and sun+1%
- Wind and comfort0%
- Weather total+1%
RunWeather’s pace model at your goal effort, over every hour you are on course (07:30 to 09:30 local), weighted by the time you spend in each, using the five-year race-morning average. 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
| Distance | Elapsed time |
|---|---|
| 3.1 mi | 0:28:26 |
| 6.2 mi | 0:56:53 |
| 9.3 mi | 1:25:19 |
| 12.4 mi | 1:53:45 |
| 13.1 mi · Finish | 2:00:00 |
In the app
Your race plan, on race morning
Add the Austin International 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.
Goal vs race day
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
Formerly the 3M Half Marathon, the Spurs Austin International Half runs a net downhill route toward downtown Austin. Check the current map and shuttle details.
RACE MORNING AT 07:302021–202526–54°FWhere most starts fell, in the weather near Austin around race day. Not a forecast.
- AVERAGE
- 40°F
- HUMIDITY
- 69%
- WIND
- 8 mph
Official race site ↗01A downhill profile can tempt an over-fast opening; decide your effort from the actual weather and course.
02Compare the conditions at your start and expected finish before settling on kit and effort.
03Confirm late changes to the route, start wave and logistics with the organiser.
Race-window historyLast 5 years, race date ±5 days
A range for planning Austin International Half Marathon: weather near Austin on race morning, the last 5 years (2021 to 2025, race date ±5 days). Not a forecast.
Typical start-hour air40°F10th–90th percentile 26°F–54°FDew point / humidity30°F69% relative humidityStart-hour wind8 mphDirection varies by dayHours with rain4%Historical frequency at this hourAIR THROUGH THE RUN40°F → 52°F by +4hThe five-year picture
07:00- Air temperature
- 40°F
- Humidity
- 69%
- Wind
- 8 mph
- Hours with rain
- 4%
Hover or drag to explore. Use ← → when focused. Shading: middle 80% of sampled temperatures.
Five-year average Middle 80% of sampled hoursThe sampled air warms by about 12°F across four hours. Check your expected finish-hour forecast, not just the start.
WIND CONTEXTWhere the breeze came from
WIND FROMN17 of 55 samples · 31%
Mean 11 mphThe 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.
January climateAll-hours monthly averages
January averages in Austin, from 2022 to 2024. These are monthly conditions, not a race-day forecast.
- mean temperature
- 51°F
- mean humidity
- 64%
- mean wind
- 8 mph
- hours with rain
- 12%
Monthly, all-hours averages for Austin, 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 AustinAustin International Half Marathon FAQs7 questions
When is the 2027 Austin International Half Marathon?
Austin International Half Marathon is listed for 17 January 2027. Confirm the latest details on the official event website before travelling.
Is the weather shown a forecast for the Austin International 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 Austin International Half Marathon?
Around the 07:30 start, mornings around race day near Austin in the last 5 years averaged 40°F (5°C), 69% humidity and 13 km/h wind. Most started between 26°F and 54°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 Austin International Half Marathon?
2023. Around race day that year it was about 50°F (10°C) around the 07:30 start, against 40°F (5°C) on an average year.
Which recent year had the windiest race morning at the Austin International Half Marathon?
2024, with about 16 km/h of wind around the 07:30 start. Over the last 5 years the wind here came mostly from the north.
How should I pace the Austin International 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 Austin International 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.
Austin race morning, on your phone.
Free on iPhone and Android. Your race plan, updated with the forecast until the gun.
On a computer? Scan with your phone camera to get the app.
Example race: a hot half marathon in Florida