racecast.io

Boulder Boulder

Boulder, CO, USA

Partly cloudy throughout the day.

partly-cloudy-night
8
partly-cloudy-night
8
Details
partly-cloudy-day
8
partly-cloudy-day
8
partly-cloudy-day
9
partly-cloudy-day
9
partly-cloudy-day
9
partly-cloudy-day
9
partly-cloudy-day
9
partly-cloudy-day
9
partly-cloudy-day
9
partly-cloudy-day
9
Pre-Race
Race
Post-Race
Save yourself some pain, trust me. Squirrel's Nut Butter Anti Chafe Salve.
When you buy through our links, we may earn a commission.
Wanna to know when the weather changes? .

Race Overview

The Bolder Boulder (styled as BOLDERBoulder and previously BolderBOULDER) is an annual 10-kilometer run in Boulder, Colorado. The most recent race featured over 54,000 runners, walkers, and wheelchair racers, making it the second largest 10k race in the US and the fifth largest road race in the world. It has one of the largest non-marathon prize purses in road racing.
Wikipedia

FAQ

When is the 2026 Boulder Boulder?

The 2026 Boulder Boulder will be held on Monday May 25, 2026.

Boulder Boulder Weather History

Boulder Boulder Weather Averages

Average Temp: 57°, Average Low: 46°, Average High: 69°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
50°
54°
57°
60°
62°
64°
66°
Feel49°53°56°59°61°64°65°
Rain-------
Wind4mph
4mph
5mph
5mph
7mph
7mph
8mph
Dew41°42°41°41°39°39°38°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Boulder Boulder 2025

May 26, 2025
Partly cloudy throughout the day with rain.
Low: 47°, High: 61°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
cloudy 50°
cloudy 50°
cloudy 50°
cloudy 50°
cloudy 52°
partly-cloudy-day 56°
partly-cloudy-day 61°
Feel50°50°50°50°52°56°61°
Rain-------
Wind0mph
0mph
0mph
0mph
3mph
0mph
6mph
Dew50°50°50°50°52°55°53°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 9Run Score: 8Run Score: 9

Boulder Boulder 2024

May 27, 2024
Clear conditions throughout the day.
Low: 52°, High: 77°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 55°
clear-day 61°
clear-day 63°
clear-day 68°
clear-day 72°
clear-day 72°
clear-day 74°
Feel55°61°63°68°72°72°74°
Rain-------
Wind0mph
3mph
10mph
10mph
9mph
10mph
9mph
Dew34°34°34°34°32°34°34°
RunScoreRun Score: 8Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Boulder Boulder 2023

May 29, 2023
Clear conditions throughout the day.
Low: 50°, High: 81°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 54°
clear-day 61°
clear-day 63°
clear-day 68°
clear-day 70°
partly-cloudy-day 74°
clear-day 77°
Feel54°61°63°68°70°74°77°
Rain-------
Wind0mph
0mph
0mph
0mph
5mph
5mph
6mph
Dew43°45°43°43°48°45°48°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 8Run Score: 8Run Score: 8

Boulder Boulder 2022

May 30, 2022
Clearing in the afternoon with early morning rain.
Low: 46°, High: 64°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
cloudy 50°
partly-cloudy-day 52°
clear-day 54°
clear-day 58°
clear-day 60°
clear-day 60°
clear-day 62°
Feel45°52°54°58°60°60°62°
Rain-------
Wind12mph
5mph
6mph
4mph
7mph
17mph
12mph
Dew31°31°30°29°29°28°25°
RunScoreRun Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 7Run Score: 8

Boulder Boulder 2021

May 29, 2021
Becoming cloudy in the afternoon with late afternoon rain.
Low: 51°, High: 64°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 53°
clear-day 59°
clear-day 61°
clear-day 62°
partly-cloudy-day 61°
partly-cloudy-day 63°
partly-cloudy-day 61°
Feel53°59°61°62°61°63°61°
Rain-------
Wind0mph
0mph
7mph
7mph
9mph
7mph
6mph
Dew39°45°50°50°52°50°50°
RunScoreRun Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9

Boulder Boulder 2020

May 22, 2020
Clear conditions throughout the day.
Low: 45°, High: 80°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 52°
clear-day 59°
clear-day 61°
clear-day 65°
clear-day 71°
clear-day 73°
clear-day 77°
Feel52°59°61°65°71°73°77°
Rain-------
Wind0mph
2mph
2mph
3mph
5mph
6mph
14mph
Dew34°33°34°34°32°26°19°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 7

Boulder Boulder 2019

May 28, 2019
Partly cloudy throughout the day with rain.
Low: 42°, High: 56°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 42°
partly-cloudy-day 46°
clear-day 48°
clear-day 51°
clear-day 53°
partly-cloudy-day 56°
partly-cloudy-day 54°
Feel38°43°46°51°53°56°54°
Rain-------
Wind6mph
5mph
5mph
8mph
6mph
6mph
9mph
Dew41°42°42°41°41°40°39°
RunScoreRun Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9

Boulder Boulder 2018

May 28, 2018
Partly cloudy throughout the day with afternoon rain.
Low: 55°, High: 64°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
cloudy 59°
cloudy 59°
partly-cloudy-day 62°
partly-cloudy-day 64°
cloudy 64°
cloudy 62°
cloudy 62°
Feel59°59°62°64°64°62°62°
Rain-------
Wind0mph
0mph
0mph
6mph
7mph
7mph
5mph
Dew52°51°51°52°52°52°52°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9

Boulder Boulder 2017

May 29, 2017
Becoming cloudy in the afternoon with rain.
Low: 46°, High: 67°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 50°
clear-day 55°
clear-day 59°
clear-day 62°
clear-day 64°
partly-cloudy-day 67°
partly-cloudy-day 62°
Feel49°55°59°62°64°67°62°
Rain-------
Wind3mph
0mph
3mph
4mph
5mph
3mph
6mph
Dew43°43°43°41°40°39°39°
RunScoreRun Score: 9Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 9

Boulder Boulder 2016

May 30, 2016
Clear conditions throughout the day with afternoon rain.
Low: 46°, High: 77°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 52°
clear-day 57°
clear-day 61°
clear-day 68°
clear-day 57°
clear-day 77°
clear-day 77°
Feel52°57°61°68°57°77°77°
Rain-------
Wind0mph
3mph
0mph
0mph
6mph
7mph
5mph
Dew39°43°38°41°23°40°42°
RunScoreRun Score: 8Run Score: 9Run Score: 8Run Score: 8Run Score: 9Run Score: 8Run Score: 8

Boulder Boulder 2015

May 25, 2015
Partly cloudy throughout the day with late afternoon rain.
Low: 41°, High: 68°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 44°
clear-day 46°
clear-day 52°
clear-day 53°
clear-day 55°
partly-cloudy-day 59°
partly-cloudy-day 62°
Feel44°46°52°53°55°59°62°
Rain-------
Wind0mph
0mph
0mph
0mph
7mph
5mph
5mph
Dew41°41°41°41°43°43°43°
RunScoreRun Score: 7Run Score: 7Run Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9

Boulder Boulder 2014

May 26, 2014
Becoming cloudy in the afternoon.
Low: 54°, High: 72°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 56°
clear-day 61°
clear-day 65°
clear-day 67°
clear-day 69°
clear-day 71°
clear-day 72°
Feel56°61°65°67°69°71°72°
Rain-------
Wind5mph
3mph
0mph
3mph
2mph
6mph
7mph
Dew40°42°43°45°46°44°44°
RunScoreRun Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8

Boulder Boulder 2013

May 27, 2013
Clear conditions throughout the day.
Low: 51°, High: 82°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 55°
clear-day 62°
clear-day 69°
clear-day 75°
clear-day 80°
clear-day 77°
clear-day 80°
Feel55°62°69°75°80°77°80°
Rain-------
Wind5mph
0mph
0mph
0mph
10mph
6mph
7mph
Dew29°32°29°25°16°18°18°
RunScoreRun Score: 9Run Score: 8Run Score: 8Run Score: 7Run Score: 8Run Score: 8Run Score: 8

Boulder Boulder 2012

May 28, 2012
Clear conditions throughout the day.
Low: 46°, High: 76°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
clear-day 51°
clear-day 56°
clear-day 62°
clear-day 64°
clear-day 67°
clear-day 67°
clear-day 71°
Feel51°56°62°64°67°67°71°
Rain-------
Wind0mph
4mph
4mph
6mph
17mph
6mph
12mph
Dew27°27°20°13°11°9°11°
RunScoreRun Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 7Run Score: 9Run Score: 8

Boulder Boulder 2011

May 30, 2011
Partly cloudy throughout the day.
Low: 50°, High: 64°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
cloudy 55°
cloudy 55°
cloudy 59°
cloudy 59°
cloudy 61°
partly-cloudy-day 62°
partly-cloudy-day 62°
Feel55°55°59°59°61°62°62°
Rain-------
Wind8mph
9mph
8mph
10mph
8mph
8mph
8mph
Dew54°52°52°52°50°46°43°
RunScoreRun Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 9Run Score: 9Run Score: 9

Boulder Boulder 2010

May 31, 2010
Partly cloudy throughout the day.
Low: 39°, High: 82°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 46°
clear-day 51°
clear-day 56°
clear-day 58°
partly-cloudy-day 60°
partly-cloudy-day 63°
partly-cloudy-day 65°
Feel42°51°56°58°60°63°65°
Rain-------
Wind7mph
8mph
6mph
4mph
6mph
7mph
4mph
Dew44°41°40°40°36°33°30°
RunScoreRun Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 9

Boulder Boulder 2009

May 25, 2009
Partly cloudy throughout the day with rain.
Low: 38°, High: 51°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
cloudy 43°
cloudy 44°
cloudy 46°
cloudy 47°
cloudy 49°
partly-cloudy-day 51°
partly-cloudy-day 49°
Feel41°44°46°47°48°51°48°
Rain-------
Wind4mph
2mph
2mph
3mph
4mph
5mph
5mph
Dew52°54°53°52°51°49°47°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9

Boulder Boulder 2008

May 26, 2008
Cloudy skies throughout the day with a chance of rain throughout the day.
Low: 36°, High: 45°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
cloudy 41°
cloudy 40°
cloudy 37°
cloudy 39°
rain 40°
cloudy 40°
cloudy 41°
Feel35°35°31°33°34°32°34°
Rain----light--
Wind9mph
8mph
8mph
8mph
8mph
12mph
11mph
Dew45°45°45°45°45°47°47°
RunScoreRun Score: 7Run Score: 7Run Score: 7Run Score: 7Run Score: 7Run Score: 6Run Score: 7

Boulder Boulder 2006

May 29, 2006
Partly cloudy throughout the day with late afternoon rain.
Low: 35°, High: 57°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 38°
partly-cloudy-day 41°
partly-cloudy-day 45°
partly-cloudy-day 48°
partly-cloudy-day 51°
partly-cloudy-day 53°
partly-cloudy-day 56°
Feel34°37°41°46°51°53°56°
Rain-------
Wind5mph
6mph
6mph
4mph
5mph
6mph
14mph
Dew34°34°31°27°24°25°25°
RunScoreRun Score: 7Run Score: 8Run Score: 8Run Score: 9Run Score: 9Run Score: 9Run Score: 8

Boulder Boulder 2005

May 30, 2005
Cloudy skies throughout the day with rain.
Low: 36°, High: 48°, Heavy Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 41°
partly-cloudy-day 42°
partly-cloudy-day 44°
partly-cloudy-day 44°
partly-cloudy-day 46°
rain 46°
rain 48°
Feel41°40°42°43°46°45°46°
Rain-----lightlight
Wind2mph
4mph
4mph
3mph
3mph
3mph
5mph
Dew49°50°52°52°52°54°54°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 6Run Score: 9

Boulder Boulder 2004

May 31, 2004
Partly cloudy throughout the day with morning rain or snow.
Low: 32°, High: 52°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 34°
rain 35°
partly-cloudy-day 37°
rain 39°
partly-cloudy-day 45°
partly-cloudy-day 45°
partly-cloudy-day 48°
Feel25°27°28°32°39°41°43°
Rain-light-light---
Wind13mph
11mph
14mph
13mph
12mph
10mph
11mph
Dew26°26°29°28°26°25°25°
RunScoreRun Score: 5Run Score: 5Run Score: 5Run Score: 6Run Score: 7Run Score: 8Run Score: 8

Boulder Boulder 2003

May 30, 2003
Partly cloudy throughout the day with late afternoon rain.
Low: 59°, High: 88°, Light Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 67°
partly-cloudy-day 71°
partly-cloudy-day 74°
partly-cloudy-day 78°
partly-cloudy-day 81°
partly-cloudy-day 84°
partly-cloudy-day 87°
Feel67°71°74°78°80°82°84°
Rain-------
Wind7mph
6mph
5mph
3mph
5mph
8mph
12mph
Dew48°49°48°48°47°46°45°
RunScoreRun Score: 9Run Score: 8Run Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 6

Boulder Boulder 2002

May 27, 2002
Partly cloudy throughout the day.
Low: 48°, High: 79°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 53°
partly-cloudy-day 58°
partly-cloudy-day 61°
partly-cloudy-day 66°
partly-cloudy-day 69°
partly-cloudy-day 75°
partly-cloudy-day 79°
Feel53°58°61°66°69°75°79°
Rain-------
Wind5mph
8mph
6mph
5mph
3mph
5mph
8mph
Dew40°39°39°39°37°36°28°
RunScoreRun Score: 9Run Score: 9Run Score: 9Run Score: 9Run Score: 8Run Score: 8Run Score: 8

Boulder Boulder 2001

May 28, 2001
Cloudy skies throughout the day with late afternoon rain.
Low: 48°, High: 78°, Heavy Rain
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 50°
cloudy 61°
cloudy 66°
cloudy 68°
cloudy 71°
cloudy 74°
partly-cloudy-day 76°
Feel50°61°66°68°71°74°76°
Rain-------
Wind7mph
12mph
15mph
14mph
9mph
11mph
9mph
Dew47°49°46°46°43°43°42°
RunScoreRun Score: 9Run Score: 8Run Score: 7Run Score: 7Run Score: 8Run Score: 7Run Score: 8

Boulder Boulder 2000

May 29, 2000
Partly cloudy throughout the day.
Low: 53°, High: 91°
Time7AM8AM9AM10AM11AM12PM1PM
Temp
partly-cloudy-day 61°
partly-cloudy-day 68°
partly-cloudy-day 74°
partly-cloudy-day 80°
partly-cloudy-day 84°
partly-cloudy-day 84°
partly-cloudy-day 87°
Feel61°68°74°80°82°82°84°
Rain-------
Wind10mph
10mph
10mph
13mph
10mph
11mph
9mph
Dew47°46°48°48°48°48°43°
RunScoreRun Score: 8Run Score: 8Run Score: 8Run Score: 7Run Score: 7Run Score: 7Run Score: 7