Hidden Gem Half Marathon

Flossmoor, IL, USA · September 12, 2026
partly-cloudy-day67°·77° high·Breezy·Dry
8
Register
Weather
Pace Calc
Course
Race Info
FAQ
History

Race Day Weather

partly-cloudy-day
67°at start
84° high
Breezy
Dry

Warm day, hydrate often

Runners will face temperatures starting at 64°F and rising to 77°F, with humidity averaging 82% and a dew point of 65°F. Light winds from the SSW at 9 mph may provide some relief, but hydration will be crucial. Runners should consider starting conservatively to adjust for the rising heat and humidity throughout the race.

partly-cloudy-night9
partly-cloudy-night9
partly-cloudy-day9
partly-cloudy-day8
partly-cloudy-day8
partly-cloudy-day7
partly-cloudy-day7
partly-cloudy-day6
partly-cloudy-day6

Pace Calculator

Distance: 13.1mi
0:00:00
HH:MM:SS
Pace
—
Weather Adj.
—
Common Goals:

Get forecast alerts for Hidden Gem Half Marathon

We'll text or email you when the forecast shifts — so you can adjust gear, pacing, and strategy. Max one per day.

Race Info

The Hidden Gem is a pure road race with minimal backtracks through the distinct neighborhoods of Flossmoor, IL. It’s an ideal race for both the serious and casual runner. Anyone training for the Chicago Marathon will appreciate the September timing, while those with more modest goals are sure to enjoy an entertaining run through beautiful, shady neighborhoods with cheering residents lining the route. Source

Website
Area Map

Course Map

Course Map Unavailable

We don't have course map data for Hidden Gem Half Marathon yet. If you have a GPX file (or other format) for this race, we'd love to add it!

FAQ

Ask a Question about the Hidden Gem Half Marathon

Racecast Concierge (free during beta)

Ask a question about the Hidden Gem Half Marathon and we'll do the hard part and find the answer for you within 48 hours.

By using Racecast Concierge, you agree to receive email alerts pertaining to the Hidden Gem Half Marathon and general racecast.io updates.

When is the 2026 Hidden Gem Half Marathon?

The 2026 Hidden Gem Half Marathon will be held on Saturday September 12, 2026.

What is the time limit for the Hidden Gem Half Marathon?

The time limit for the Hidden Gem Half Marathon is 3 hours.

What will the weather be like for the 2026 Hidden Gem Half Marathon?

The forecast calls for a high of 85°F and a low of 66°F with a 5% chance of rain.

Historical Weather

Based on 2 years of data
Avg Temp
59°F
L:51° H:59°
RunScore
8
Conditions
Rain Freq
0%
0 of 2 yrs
Wind13mph
Dew43°F

Temperature History

Range of temperatures during race hours for each year.

Detailed History

YearConditionsLow / HighRainScoreResults

2025 Hidden Gem Half Marathon

Becoming cloudy in the afternoon.

2025
clear-day
51°/59°-
8

2024 Hidden Gem Half Marathon

Partly cloudy throughout the day.

2024
clear-day
52°/59°-
8

More IL Races

Starved Rock Country Marathon
2027-05-08 · 42.200km · Ottawa, IL, USA
Fox Valley Marathon
2026-09-20 · 42.200km · St. Charles, IL, USA
Belleville Main Street Marathon
2026-09-26 · 42.200km · Belleville, IL, USA
Quad Cities Marathon
2026-09-27 · 42.200km · Moline, IL, USA
Des Plaines River Trail Marathon
2026-10-10 · Lincolnshire, IL, USA
Chicago Marathon
2026-10-11 · 42.200km · Chicago, IL, USA
Free guidesFueling Guide·Race Morning Guide·Race Day Gear Guide·Pacing Strategy Guide

Submit a correction

Spot something wrong or missing for the Hidden Gem Half Marathon? Let us know and we'll update it.

You Need an Account For That

Setting up a racecast.io account will allow you to start building a reputation in the community. Over time you'll be able to rate races, join the discussion, and post in the community.

Right now we are invite only, you can get on the waitlist by entering your email below:

OR

Submit a race

Missing a race? Send it in and we'll add it to Racecast.