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Diablo Trail Marathon

Clayton, CA, USA

Clear conditions throughout the day.

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9
clear-day
9
Details
clear-day
9
clear-day
8
clear-day
8
clear-day
7
clear-day
7
clear-day
7
clear-day
6
clear-day
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clear-day
6
Pre-Race
Race
Post-Race
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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.
Wikipedia

FAQ

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°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
61°
64°
68°
72°
76°
79°
83°
85°
Feel61°64°68°72°76°78°81°83°
Rain--------
Wind4mph
5mph
5mph
6mph
9mph
10mph
11mph
11mph
Dew52°52°52°52°52°50°49°48°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 7Run Score: 7Run Score: 6

Diablo Trail Marathon 2025

Sep 7, 2025
Clear conditions throughout the day.
Low: 60°, High: 84°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
clear-day 64°
clear-day 67°
clear-day 70°
clear-day 74°
clear-day 77°
clear-day 79°
clear-day 81°
clear-day 82°
Feel64°67°70°74°77°79°80°81°
Rain--------
Wind9mph
10mph
5mph
8mph
8mph
13mph
16mph
15mph
Dew58°58°57°54°52°51°52°53°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 6Run Score: 6

Diablo Trail Marathon 2024

Sep 8, 2024
Clear conditions throughout the day.
Low: 57°, High: 96°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
clear-day 60°
clear-day 63°
clear-day 68°
clear-day 74°
clear-day 82°
clear-day 87°
clear-day 92°
clear-day 94°
Feel60°63°68°74°81°84°88°90°
Rain--------
Wind3mph
0mph
6mph
5mph
6mph
6mph
8mph
7mph
Dew53°54°56°56°53°48°39°44°
RunScoreRun Score: 9Run Score: 8Run Score: 9Run Score: 8Run Score: 7Run Score: 7Run Score: 7Run Score: 6

Diablo Trail Marathon 2023

Sep 10, 2023
Clear conditions throughout the day.
Low: 55°, High: 88°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
clear-day 58°
clear-day 62°
clear-day 67°
clear-day 72°
clear-day 75°
clear-day 79°
clear-day 83°
clear-day 87°
Feel58°62°67°72°75°79°81°84°
Rain--------
Wind1mph
1mph
4mph
4mph
8mph
10mph
10mph
10mph
Dew51°52°55°55°55°53°51°48°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 7Run Score: 7

Diablo Trail Marathon 2022

Sep 18, 2022
Partly cloudy throughout the day with rain.
Low: 63°, High: 72°, Moderate Rain
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
rain 63°
rain 64°
rain 66°
rain 66°
cloudy 71°
rain 66°
cloudy 69°
partly-cloudy-day 72°
Feel63°64°66°66°71°66°69°72°
Rainlightlightlightlight-light--
Wind8mph
9mph
9mph
7mph
13mph
14mph
9mph
14mph
Dew53°53°53°56°54°58°58°56°
RunScoreRun Score: 9Run Score: 9Run Score: 8Run Score: 6Run Score: 7Run Score: 5Run Score: 8Run Score: 7

Diablo Trail Marathon 2021

Aug 22, 2021
Clearing in the afternoon.
Low: 59°, High: 81°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
cloudy 60°
cloudy 61°
cloudy 63°
clear-day 68°
clear-day 71°
clear-day 74°
clear-day 79°
clear-day 81°
Feel60°61°63°68°71°74°79°81°
Rain--------
Wind5mph
6mph
8mph
8mph
4mph
12mph
16mph
11mph
Dew53°54°54°55°55°55°55°53°
RunScoreRun Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 7Run Score: 6Run Score: 7

Diablo Trail Marathon 2019

Aug 25, 2019
Clear conditions throughout the day.
Low: 64°, High: 94°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
clear-day 67°
clear-day 71°
clear-day 74°
clear-day 79°
clear-day 84°
clear-day 89°
clear-day 92°
clear-day 92°
Feel67°71°74°79°84°88°89°90°
Rain--------
Wind0mph
4mph
5mph
6mph
8mph
13mph
15mph
13mph
Dew57°57°59°59°58°55°52°55°
RunScoreRun Score: 7Run Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 5Run Score: 5Run Score: 5

Diablo Trail Marathon 2018

Aug 26, 2018
Clear conditions throughout the day.
Low: 55°, High: 79°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
cloudy 58°
cloudy 61°
partly-cloudy-day 64°
clear-day 68°
clear-day 70°
clear-day 75°
clear-day 78°
clear-day 79°
Feel58°61°64°68°70°75°78°79°
Rain--------
Wind7mph
8mph
5mph
9mph
13mph
7mph
13mph
15mph
Dew51°51°52°52°52°52°51°49°
RunScoreRun Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 6

Diablo Trail Marathon 2017

Aug 27, 2017
Clear conditions throughout the day.
Low: 65°, High: 104°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
clear-day 68°
clear-day 73°
clear-day 79°
clear-day 84°
clear-day 92°
clear-day 96°
clear-day 101°
clear-day 103°
Feel68°73°79°84°90°94°98°99°
Rain--------
Wind0mph
0mph
0mph
4mph
5mph
4mph
6mph
8mph
Dew58°57°58°57°53°52°49°47°
RunScoreRun Score: 7Run Score: 7Run Score: 7Run Score: 7Run Score: 6Run Score: 6Run Score: 5Run Score: 5

Diablo Trail Marathon 2016

Aug 28, 2016
Clearing in the afternoon.
Low: 59°, High: 82°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
cloudy 61°
cloudy 63°
partly-cloudy-day 67°
clear-day 70°
clear-day 73°
clear-day 76°
clear-day 80°
clear-day 82°
Feel61°63°67°70°73°76°80°81°
Rain--------
Wind7mph
8mph
5mph
1mph
10mph
10mph
13mph
13mph
Dew51°51°51°51°52°52°52°51°
RunScoreRun Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 6Run Score: 6

Diablo Trail Marathon 2015

Aug 30, 2015
Clear conditions throughout the day with afternoon rain.
Low: 63°, High: 84°, Light Rain
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
partly-cloudy-day 65°
partly-cloudy-day 69°
clear-day 71°
clear-day 75°
rain 78°
clear-day 80°
clear-day 82°
clear-day 83°
Feel65°69°71°75°78°80°80°82°
Rain----light---
Wind7mph
6mph
8mph
9mph
11mph
13mph
8mph
10mph
Dew56°56°55°54°54°50°48°49°
RunScoreRun Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 5Run Score: 7Run Score: 7Run Score: 7

Diablo Trail Marathon 2014

Sep 7, 2014
Clear conditions throughout the day.
Low: 56°, High: 84°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
cloudy 58°
partly-cloudy-day 61°
clear-day 64°
clear-day 69°
clear-day 72°
clear-day 75°
clear-day 80°
clear-day 82°
Feel58°61°64°69°72°75°80°80°
Rain--------
Wind9mph
9mph
5mph
3mph
12mph
10mph
12mph
10mph
Dew52°52°52°52°53°53°52°47°
RunScoreRun Score: 9Run Score: 8Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 7

Diablo Trail Marathon 2013

Oct 5, 2013
Clear conditions throughout the day.
Low: 51°, High: 82°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
clear-day 56°
clear-day 67°
clear-day 70°
clear-day 72°
clear-day 75°
clear-day 77°
clear-day 80°
clear-day 81°
Feel56°67°70°72°75°77°79°79°
Rain--------
Wind1mph
4mph
4mph
7mph
9mph
7mph
8mph
6mph
Dew29°23°23°25°25°26°25°25°
RunScoreRun Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Diablo Trail Marathon 2012

Sep 15, 2012
Clear conditions throughout the day.
Low: 52°, High: 84°
Time8AM9AM10AM11AM12PM1PM2PM3PM
Temp
clear-day 54°
clear-day 57°
clear-day 62°
clear-day 65°
clear-day 70°
clear-day 75°
clear-day 80°
clear-day 82°
Feel54°57°62°65°70°75°80°80°
Rain--------
Wind0mph
0mph
3mph
11mph
10mph
9mph
11mph
11mph
Dew50°50°52°52°53°51°48°45°
RunScoreRun Score: 8Run Score: 8Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 7