Boulder Weather in October
Average highs run from 65°F on October 1 to 50°F on October 31, and lows from 33°F to 23°F. Normal precipitation for the month is 0.64 in over about 7 wet days.
October day by day
The normal high and low for each date, and the record, in °F.
- Normal low
- Normal high
- Record high
- Record low
October at a glance
- Average high
- 57°F
- Average low
- 28°F
- Precipitation
- 0.64 in
- Record high
- 85°FOct 3, 2010
- Record low
- -23°FOct 30, 1991
- Chance of a freeze
- 100%
- Daylight
- 11 h 41 min to 10 h 07 min
- Cloud cover
- 64%
- Humidity
- 65%
- Dew point
- 28°F
- Wind
- 6.7 mph
Every day of the month
A wet day has at least 0.01 inch of precipitation.
| Date | Normal high | Normal low | Record high | Record low | Chance wet |
|---|---|---|---|---|---|
| Oct 1 | 65°F | 33°F | 83°F 1992 | 12°F 1950 | 22% |
| Oct 2 | 65°F | 33°F | 83°F 2010 | 15°F 1950 | 22% |
| Oct 3 | 64°F | 32°F | 85°F 2010 | 14°F 1916 | 22% |
| Oct 4 | 64°F | 32°F | 82°F 2024 | 15°F 1973 | 22% |
| Oct 5 | 63°F | 32°F | 79°F 1902 | 12°F 2001 | 22% |
| Oct 6 | 63°F | 31°F | 79°F 1933 | 11°F 1974 | 22% |
| Oct 7 | 62°F | 31°F | 79°F 1980 | 10°F 1990 | 22% |
| Oct 8 | 62°F | 31°F | 80°F 1976 | 11°F 1985 | 22% |
| Oct 9 | 61°F | 30°F | 79°F 1942 | 7°F 2019 | 22% |
| Oct 10 | 61°F | 30°F | 80°F 1934 | 6°F 1985 | 22% |
| Oct 11 | 60°F | 29°F | 83°F 1934 | 3°F 2019 | 22% |
| Oct 12 | 60°F | 29°F | 78°F 1964 | 6°F 2009 | 22% |
| Oct 13 | 59°F | 29°F | 77°F 1964 | 10°F 2008 | 22% |
| Oct 14 | 58°F | 28°F | 79°F 1958 | 10°F 1952 | 21% |
| Oct 15 | 58°F | 28°F | 76°F 1991 | 15°F 1952 | 21% |
| Oct 16 | 57°F | 28°F | 78°F 1927 | 7°F 1946 | 21% |
| Oct 17 | 57°F | 27°F | 75°F 1955 | 8°F 1996 | 21% |
| Oct 18 | 56°F | 27°F | 76°F 2003 | 5°F 1905 | 21% |
| Oct 19 | 56°F | 27°F | 75°F 2023 | 8°F 1905 | 21% |
| Oct 20 | 55°F | 26°F | 77°F 1927 | 10°F 1943 | 21% |
| Oct 21 | 55°F | 26°F | 75°F 2003 | 9°F 1996 | 21% |
| Oct 22 | 54°F | 26°F | 79°F 2003 | 13°F 1957 | 21% |
| Oct 23 | 54°F | 25°F | 72°F 1999 | 8°F 1919 | 21% |
| Oct 24 | 53°F | 25°F | 72°F 2007 | 0°F 1919 | 21% |
| Oct 25 | 53°F | 25°F | 71°F 1990 | -15°F 2020 | 21% |
| Oct 26 | 52°F | 24°F | 75°F 1944 | -18°F 2020 | 21% |
| Oct 27 | 52°F | 24°F | 70°F 1944 | 2°F 2023 | 21% |
| Oct 28 | 51°F | 24°F | 75°F 1937 | 1°F 1971 | 20% |
| Oct 29 | 51°F | 23°F | 71°F 1937 | -10°F 2019 | 20% |
| Oct 30 | 50°F | 23°F | 69°F 1987 | -23°F 1991 | 20% |
| Oct 31 | 50°F | 23°F | 66°F 2008 | -11°F 2002 | 20% |
Chance of rain
- Chance of a wet day
Sunrise and sunset
Times for 2026, local time (MDT).
- October 1
- sunrise 7:27 AM, sunset 7:08 PM
- October 31
- sunrise 8:08 AM, sunset 6:15 PM
Other months
Sources
Normals: NOAA NCEI U.S. Climate Normals, 1991-2020, station USC00241008 (Boulder), public domain. Records: NOAA GHCN-Daily, station USW00024135, every year on file, quality-flagged values removed. Cloud, humidity, wind and sunshine: NASA POWER (MERRA-2, CERES and GEWEX SRB), 1991-2020. The data was obtained from the National Aeronautics and Space Administration (NASA) Langley Research Center's Prediction Of Worldwide Energy Resources (POWER) project funded through the NASA Earth Science Division: POWER Daily API v2, accessed 2026-09-24. Sun and moon: computed with the NOAA solar equations and Meeus.