FindMyMarathon / Race-day weather
Indianapolis Monumental Marathon Weather Forecast 2026
Check the Indianapolis Monumental Marathon weather for your time on the course.
Choose your start time and goal finish time for temperature, rain chance and wind. Free to use.
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Your race forecast
Goal 2:00:00 Indianapolis local time
Start
8:00am- Wind
- 5.00 mph NW
- Gusts
- 9 mph
- Humidity
- 87%
- Dewpoint
- 41°F
- Rain chance
- 0%
Halfway
9:00am- Wind
- 5.00 mph NW
- Gusts
- 8 mph
- Humidity
- 83%
- Dewpoint
- 41°F
- Rain chance
- 0%
Finish
10:00am- Wind
- 5.00 mph NW
- Gusts
- 8 mph
- Humidity
- 77%
- Dewpoint
- 42°F
- Rain chance
- 0%
Checkpoint colorsStartHalfwayFinish
Expect a partly cloudy start in downtown Indianapolis near 45°F, with temperatures rising to about 49°F by the finish. Partly cloudy conditions should hold for much of the day. The biggest wind challenge looks to be in the middle section, where headwind exposure may be the most noticeable. Overall, the temperature setup looks fairly manageable for steady pacing.
Temperature & rain during your race
Wind along the course
Start to Mile 5
Neutral
- Tailwind
- 3%
- Headwind
- 6%
- Gusts
- 9 mph
Miles 6 - 10
Challenging
- Tailwind
- 0%
- Headwind
- 33%
- Gusts
- 9 mph
Miles 11 - 15
Challenging
- Tailwind
- 2%
- Headwind
- 63%
- Gusts
- 8 mph
Miles 16 - 20
Neutral
- Tailwind
- 7%
- Headwind
- 1%
- Gusts
- 8 mph
Miles 21 to Finish
Slightly helpful
- Tailwind
- 12%
- Headwind
- 1%
- Gusts
- 8 mph
What to expect
- The start should feel cool while you wait near the start area, so a throwaway layer could still be helpful before moving into your corral.
- Late-race conditions look relatively manageable, which should reward runners who stay patient through Halfway and the second half.
- Wind impact looks mixed rather than strongly favorable or strongly challenging across the full route.
What to wear & carry
Based on the start temperature, wind and rain risk.
- Throwaway top at the start
- Normal fluid plan likely fine
- No major rain gear needed
- Minimal extra gear needed
2026 vs. typical Indianapolis
Historical race-day comparison
| Conditions | 2026 forecast | Typical | Difference |
|---|---|---|---|
| Race average temp | 46°F | 46°F | -0° |
| Start temperature | 45°F | 40°F | +5° |
| Start humidity | 87% | 81% | +6% |
| Start wind speed | 5 mph | 7 mph | -2 mph |
| Start wind direction | NW | N | — |
| Start conditions | Partly Cloudy | Partly Cloudy | Similar |
