Clear conditions throughout the day.
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Race Overview
Mount Diablo provides spectacular views of the San Francisco Bay Area and surrounding valleys. The 4 mile course is relatively flat and fast within Mitchell Canyon. The longer events are mountainous and very scenic.
WikipediaFAQ
When is the 2026 Diablo Trail Marathon?
The 2026 Diablo Trail Marathon will be held on Sunday September 6, 2026.
Diablo Trail Marathon Weather History
Diablo Trail Marathon Weather Averages
Average Temp: 70°, Average Low: 58°, Average High: 86°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | 61° | 64° | 68° | 72° | 76° | 79° | 83° | 85° |
| Feel | 61° | 64° | 68° | 72° | 76° | 78° | 81° | 83° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 4mph | 5mph | 5mph | 6mph | 9mph | 10mph | 11mph | 11mph |
| Dew | 52° | 52° | 52° | 52° | 52° | 50° | 49° | 48° |
| RunScore |
Diablo Trail Marathon 2025
Sep 7, 2025
Clear conditions throughout the day.
Low: 60°, High: 84°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 64° | 67° | 70° | 74° | 77° | 79° | 80° | 81° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 9mph | 10mph | 5mph | 8mph | 8mph | 13mph | 16mph | 15mph |
| Dew | 58° | 58° | 57° | 54° | 52° | 51° | 52° | 53° |
| RunScore |
Diablo Trail Marathon 2024
Sep 8, 2024
Clear conditions throughout the day.
Low: 57°, High: 96°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 60° | 63° | 68° | 74° | 81° | 84° | 88° | 90° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 3mph | 0mph | 6mph | 5mph | 6mph | 6mph | 8mph | 7mph |
| Dew | 53° | 54° | 56° | 56° | 53° | 48° | 39° | 44° |
| RunScore |
Diablo Trail Marathon 2023
Sep 10, 2023
Clear conditions throughout the day.
Low: 55°, High: 88°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 58° | 62° | 67° | 72° | 75° | 79° | 81° | 84° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 1mph | 1mph | 4mph | 4mph | 8mph | 10mph | 10mph | 10mph |
| Dew | 51° | 52° | 55° | 55° | 55° | 53° | 51° | 48° |
| RunScore |
Diablo Trail Marathon 2022
Sep 18, 2022
Partly cloudy throughout the day with rain.
Low: 63°, High: 72°, Moderate Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 63° | 64° | 66° | 66° | 71° | 66° | 69° | 72° |
| Rain | light | light | light | light | - | light | - | - |
| Wind | 8mph | 9mph | 9mph | 7mph | 13mph | 14mph | 9mph | 14mph |
| Dew | 53° | 53° | 53° | 56° | 54° | 58° | 58° | 56° |
| RunScore |
Diablo Trail Marathon 2021
Aug 22, 2021
Clearing in the afternoon.
Low: 59°, High: 81°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 60° | 61° | 63° | 68° | 71° | 74° | 79° | 81° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 5mph | 6mph | 8mph | 8mph | 4mph | 12mph | 16mph | 11mph |
| Dew | 53° | 54° | 54° | 55° | 55° | 55° | 55° | 53° |
| RunScore |
Diablo Trail Marathon 2019
Aug 25, 2019
Clear conditions throughout the day.
Low: 64°, High: 94°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 67° | 71° | 74° | 79° | 84° | 88° | 89° | 90° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 0mph | 4mph | 5mph | 6mph | 8mph | 13mph | 15mph | 13mph |
| Dew | 57° | 57° | 59° | 59° | 58° | 55° | 52° | 55° |
| RunScore |
Diablo Trail Marathon 2018
Aug 26, 2018
Clear conditions throughout the day.
Low: 55°, High: 79°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 58° | 61° | 64° | 68° | 70° | 75° | 78° | 79° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 7mph | 8mph | 5mph | 9mph | 13mph | 7mph | 13mph | 15mph |
| Dew | 51° | 51° | 52° | 52° | 52° | 52° | 51° | 49° |
| RunScore |
Diablo Trail Marathon 2017
Aug 27, 2017
Clear conditions throughout the day.
Low: 65°, High: 104°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 68° | 73° | 79° | 84° | 90° | 94° | 98° | 99° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 0mph | 0mph | 0mph | 4mph | 5mph | 4mph | 6mph | 8mph |
| Dew | 58° | 57° | 58° | 57° | 53° | 52° | 49° | 47° |
| RunScore |
Diablo Trail Marathon 2016
Aug 28, 2016
Clearing in the afternoon.
Low: 59°, High: 82°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 61° | 63° | 67° | 70° | 73° | 76° | 80° | 81° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 7mph | 8mph | 5mph | 1mph | 10mph | 10mph | 13mph | 13mph |
| Dew | 51° | 51° | 51° | 51° | 52° | 52° | 52° | 51° |
| RunScore |
Diablo Trail Marathon 2015
Aug 30, 2015
Clear conditions throughout the day with afternoon rain.
Low: 63°, High: 84°, Light Rain
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 65° | 69° | 71° | 75° | 78° | 80° | 80° | 82° |
| Rain | - | - | - | - | light | - | - | - |
| Wind | 7mph | 6mph | 8mph | 9mph | 11mph | 13mph | 8mph | 10mph |
| Dew | 56° | 56° | 55° | 54° | 54° | 50° | 48° | 49° |
| RunScore |
Diablo Trail Marathon 2014
Sep 7, 2014
Clear conditions throughout the day.
Low: 56°, High: 84°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 58° | 61° | 64° | 69° | 72° | 75° | 80° | 80° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 9mph | 9mph | 5mph | 3mph | 12mph | 10mph | 12mph | 10mph |
| Dew | 52° | 52° | 52° | 52° | 53° | 53° | 52° | 47° |
| RunScore |
Diablo Trail Marathon 2013
Oct 5, 2013
Clear conditions throughout the day.
Low: 51°, High: 82°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 56° | 67° | 70° | 72° | 75° | 77° | 79° | 79° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 1mph | 4mph | 4mph | 7mph | 9mph | 7mph | 8mph | 6mph |
| Dew | 29° | 23° | 23° | 25° | 25° | 26° | 25° | 25° |
| RunScore |
Diablo Trail Marathon 2012
Sep 15, 2012
Clear conditions throughout the day.
Low: 52°, High: 84°
| Time | 8AM | 9AM | 10AM | 11AM | 12PM | 1PM | 2PM | 3PM |
|---|---|---|---|---|---|---|---|---|
| Temp | ||||||||
| Feel | 54° | 57° | 62° | 65° | 70° | 75° | 80° | 80° |
| Rain | - | - | - | - | - | - | - | - |
| Wind | 0mph | 0mph | 3mph | 11mph | 10mph | 9mph | 11mph | 11mph |
| Dew | 50° | 50° | 52° | 52° | 53° | 51° | 48° | 45° |
| RunScore |