Heatwave Half Marathon - St. Louis | St. Louis, MO, United States

About the Event

Join us for the Heatwave Half Marathon, 10K, & 5K!
A sun-soaked summer challenge that’s perfect for the whole family.

The fun includes –

Great Swag – designer shirt & custom medal
Chip-timing with live results and awards
Free photos
FREE ice cream at the finish to help you cool off
Plenty of hot fun in the summer sun!

Grab your friends and family—you won’t want to miss this one!

Can’t make the race? No problem! We offer a virtual race option where you can run anywhere, at any time, and still earn the fun swag!

Youth-based pricing is available: ages 12 & under are only $17!

Half Marathon/10K/5K registration includes a custom bib, designer shirt, and an awesome finisher medal!
1 Mile registration is untimed and includes a custom bib, designer shirt, and an awesome finisher medal!
Kid’s Dash is a fun, untimed dash for ages 10 and under. Registration includes a mini bib, youth-sized shirt, and a specially crafted medal for our youngest runners! (If your child wants to run the kid’s dash without swag, they’re welcome to run free on race day!)

Register by midnight on Thursday, two Thursdays before race day, to guarantee your shirt!

Races Offered

1 Mile

Aug 01, 2026

straighten

Distance — 1 Miles

terrain

Type — Running

timer

07:00

sell

$22.00

10 K

Aug 01, 2026

straighten

Distance — 10K

terrain

Type — Running

timer

07:00

sell

$32.00

5 K

Aug 01, 2026

straighten

Distance — 5K

terrain

Type — Running

timer

07:00

sell

$32.00

Half-Marathon

Aug 01, 2026

straighten

Distance — 13.1 Miles

terrain

Type — Running

timer

07:00

sell

$50.00

Half-Marathon Relay

Aug 01, 2026

straighten

Distance — 13.1 Miles

terrain

Type — Running

timer

07:00

sell

$50.00

Kids Dash

Aug 01, 2026

straighten

Distance — 50m

terrain

Type — Running

timer

07:00

sell

$17.00

Virtual Race

Aug 01, 2026

straighten

Distance — Virtual Race

terrain

Type — Running

timer

07:00

sell

$42.00

Volunteer Then Run

Aug 01, 2026

straighten

Distance — Volunteer Then Run

terrain

Type — Running

timer

07:00

sell

$17.00

Weather History

These values represent the 3-year monthly averages for August in St. Louis.

thermostat Temperature

20.5° / 29.9°

wb_sunny Feels like

21.8° / 31.1°

light_mode Avg sunshine hours

11h 18m

water_drop Avg rainfall

2.7 mm

ac_unit Avg snowfall

—

air Avg wind speed

8.9 km/h (Light breeze)

opacity Sweat loss rate

Very high

terrain Course conditions

Hard and dry surface

sunny Max UV Index

High (7.0)

humidity_mid Humidity

70.4%

wb_twilight Sunrise

06:15

nightlight Sunset

19:52

About St. Louis

Learn more about the host city, St. Louis.

The Gateway City of St. Louis is the epitome of the modern Midwestern metropolis. Missouri's second-largest city is vibrant but laid-back, populous but navigable, historic but still relevant. The city's planners have created an aesthetically beautiful city, with plenty of green space amidst buildings both old and new, framed by the majestic Mississippi and Missouri rivers. And capping it all is the world's tallest man-made monument, the beautiful and iconic Gateway Arch.