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Thornton, CO Weather on October 9
October 9th in Thornton, CO typically brings pleasant fall weather, with average highs around 70°F and lows near 38°F — a 32°F daily swing. Over 55 years of records, the warmest October 9th was in 2003 (66°F average), while the coldest was 1993 (31°F) — a 35°F range across recorded history. Precipitation has occurred on 16% of recorded October 9th dates, with snow falling 2% of the time (heaviest snowfall: 2"). Temperatures on this date have remained relatively stable over the past several decades.
What to Expect on October 9
Planning for October 9th in Thornton, CO? Great weather for outdoor activities.
October 9 Weather Records for Thornton
- •The all-time record high for October 9th in Thornton, CO is 86°F, set in 2005.
- •The coldest October 9th on record dropped to 24°F in 1990.
- •A freeze (32°F or below) has occurred on October 9th in 11 of the last 55 years.
Frequently Asked Questions
What was the warmest October 9 ever in Thornton?
The warmest October 9 in Thornton, CO reached 86°F in 2005. That is 16°F above the long-term average high of 70°F.
What was the coldest October 9 ever in Thornton?
The coldest October 9 in Thornton, CO dropped to 24°F in 1990. That is 14°F below the long-term average low of 38°F.
What is the average temperature on October 9 in Thornton?
On October 9, Thornton averages a high of 70°F and a low of 38°F based on 55 years of NOAA weather observations from NORTHGLENN.
How many years of weather data are available for October 9 in Thornton?
We have 55 years of weather records for October 9 in Thornton, CO, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
October 9 Weather History in Thornton
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 81°F | 37°F | 0" | -- |
| 2024 | 84°F | 44°F | 0" | -- |
| 2023 | 80°F | 39°F | 0" | -- |
| 2022 | 69°F | 38°F | 0" | -- |
| 2021 | 78°F | 44°F | 0" | -- |
| 2020 | 83°F | 50°F | 0" | -- |
| 2019 | 82°F | 46°F | 0" | -- |
| 2018 | 43°F | 38°F | 0.1" | -- |
| 2017 | 67°F | 33°F | 0.33" | 2" |
| 2016 | 75°F | 38°F | 0" | -- |
| 2015 | 80°F | 45°F | 0" | -- |
| 2014 | 76°F | 47°F | 0" | -- |
| 2013 | 80°F | 44°F | 0" | -- |
| 2012 | 76°F | 33°F | 0" | -- |
| 2011 | 45°F | 37°F | 0.5" | -- |
| 2010 | 75°F | 47°F | 0" | -- |
| 2009 | 36°F | 26°F | 0" | -- |
| 2008 | 83°F | 41°F | 0" | -- |
| 2007 | 76°F | 38°F | 0" | -- |
| 2006 | 54°F | 38°F | 0.08" | -- |
| 2005 | 86°F | 38°F | 0" | -- |
| 2004 | 71°F | 37°F | 0" | -- |
| 2003 | 85°F | 48°F | 0" | -- |
| 2002 | 77°F | 36°F | 0" | -- |
| 2001 | 82°F | 29°F | 0.06" | -- |
| 2000 | 66°F | 29°F | 0" | -- |
| 1999 | 85°F | 41°F | 0" | -- |
| 1998 | 79°F | 45°F | 0" | -- |
| 1997 | 69°F | 34°F | 0" | -- |
| 1996 | 75°F | 40°F | 0" | -- |
| 1995 | 62°F | 33°F | 0" | -- |
| 1994 | 73°F | 39°F | 0" | -- |
| 1993 | 36°F | 26°F | 0" | -- |
| 1992 | 64°F | 37°F | 0" | -- |
| 1991 | 77°F | 43°F | 0" | -- |
| 1990 | 54°F | 24°F | 0" | -- |
| 1989 | 71°F | 46°F | 0" | -- |
| 1988 | 61°F | 41°F | 0" | -- |
| 1987 | 59°F | 27°F | 0" | -- |
| 1986 | 69°F | 44°F | 0.12" | -- |
| 1985 | 38°F | 27°F | 0.01" | -- |
| 1984 | 63°F | 36°F | 0" | -- |
| 1983 | 72°F | 38°F | 0" | -- |
| 1982 | 48°F | 30°F | 0.33" | -- |
| 1981 | 68°F | 46°F | 0" | -- |
| 1980 | 80°F | 38°F | 0" | -- |
| 1979 | 58°F | 33°F | 0.12" | -- |
| 1978 | 74°F | 41°F | 0" | -- |
| 1977 | 75°F | 31°F | 0" | -- |
| 1976 | 80°F | 34°F | 0" | -- |
| 1975 | 73°F | 28°F | 0" | -- |
| 1974 | 80°F | 34°F | 0" | -- |
| 1973 | 66°F | 43°F | 0" | -- |
| 1972 | 79°F | 47°F | 0" | -- |
| 1971 | 70°F | 31°F | 0" | -- |
Based on 55 years of data from NOAA station: NORTHGLENN
Monthly Climate Averages
Historical temperature and precipitation averages for Thornton, CO, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.