Wing-Chi Poon / CC BY-SA 2.5
Longmont, CO Weather on August 25
August 25th in Longmont, CO typically brings warm summer weather, with average highs around 87°F and lows near 54°F — a 33°F daily swing. Over 55 years of records, the warmest August 25th was in 2020 (79°F average), while the coldest was 1972 (53°F) — a 26°F range across recorded history. Rain or other precipitation has occurred on about 22% of August 25th dates historically, with the wettest August 25th recording 0.89" of rain. The last decade has been 1.1°F cooler on this date compared to 20-30 years ago.
What to Expect on August 25
Planning for August 25th in Longmont, CO? Stay hydrated and seek shade during peak afternoon hours.
August 25 Weather Records for Longmont
- •The all-time record high for August 25th in Longmont, CO is 97°F, set in 1994.
- •The coldest August 25th on record dropped to 42°F in 1990.
- •Temperatures have reached 90°F or higher on August 25th in 22 of the last 55 years.
- •Last year (1971), August 25th was 6°F cooler than the long-term average.
Frequently Asked Questions
What was the warmest August 25 ever in Longmont?
The warmest August 25 in Longmont, CO reached 97°F in 1994. That is 10°F above the long-term average high of 87°F.
What was the coldest August 25 ever in Longmont?
The coldest August 25 in Longmont, CO dropped to 42°F in 1990. That is 12°F below the long-term average low of 54°F.
What is the average temperature on August 25 in Longmont?
On August 25, Longmont averages a high of 87°F and a low of 54°F based on 55 years of NOAA weather observations from LONGMONT 2 ESE.
How many years of weather data are available for August 25 in Longmont?
We have 55 years of weather records for August 25 in Longmont, CO, sourced from NOAA's Global Historical Climatology Network. Records include daily high and low temperatures, precipitation, and snowfall data going back to 2025.
August 25 Weather History in Longmont
| Year | High | Low | Precip | Snow |
|---|---|---|---|---|
| 2025 | 71°F | 57°F | 0.05" | -- |
| 2024 | 88°F | 61°F | 0.06" | -- |
| 2023 | 90°F | 64°F | 0.01" | -- |
| 2022 | 87°F | 55°F | 0" | -- |
| 2021 | 94°F | 55°F | 0" | -- |
| 2020 | 95°F | 62°F | 0" | -- |
| 2019 | 87°F | 56°F | 0" | -- |
| 2018 | 88°F | 55°F | 0" | -- |
| 2017 | 86°F | 52°F | 0" | -- |
| 2016 | 71°F | 46°F | 0.2" | -- |
| 2015 | 94°F | 54°F | 0" | -- |
| 2014 | 82°F | 51°F | 0.07" | -- |
| 2013 | 88°F | 59°F | 0.08" | -- |
| 2012 | 80°F | 57°F | 0" | -- |
| 2011 | 96°F | 57°F | 0" | -- |
| 2010 | 89°F | 51°F | 0" | -- |
| 2009 | 76°F | 55°F | 0" | -- |
| 2008 | 86°F | 53°F | 0" | -- |
| 2007 | 85°F | 50°F | 0" | -- |
| 2006 | 80°F | 62°F | 0" | -- |
| 2005 | 85°F | 56°F | 0.02" | -- |
| 2004 | 84°F | 54°F | 0" | -- |
| 2003 | 89°F | 63°F | -- | -- |
| 2002 | 85°F | 55°F | 0" | -- |
| 2001 | 96°F | 44°F | 0" | -- |
| 2000 | 95°F | 53°F | 0" | -- |
| 1999 | 96°F | 50°F | 0" | -- |
| 1998 | 95°F | 53°F | 0" | -- |
| 1997 | 94°F | 50°F | 0" | -- |
| 1996 | 89°F | 55°F | 0" | -- |
| 1995 | 94°F | 59°F | 0.07" | -- |
| 1994 | 97°F | 56°F | 0" | -- |
| 1993 | 95°F | 54°F | 0" | -- |
| 1992 | -- | 48°F | 0.89" | -- |
| 1991 | 95°F | 55°F | 0" | -- |
| 1990 | 89°F | 42°F | 0" | -- |
| 1989 | 92°F | 49°F | 0" | -- |
| 1988 | 93°F | 55°F | 0" | -- |
| 1987 | 70°F | 54°F | 0.02" | -- |
| 1986 | 89°F | 56°F | 0" | -- |
| 1985 | 90°F | 51°F | 0" | -- |
| 1984 | 79°F | 48°F | 0" | -- |
| 1983 | 87°F | 57°F | 0" | -- |
| 1982 | 76°F | 54°F | 0" | -- |
| 1981 | 91°F | 51°F | 0.03" | -- |
| 1980 | 86°F | 53°F | 0" | -- |
| 1979 | 79°F | 51°F | 0" | -- |
| 1978 | 91°F | 58°F | 0" | -- |
| 1977 | 91°F | 58°F | 0" | -- |
| 1976 | 83°F | 53°F | 0" | -- |
| 1975 | 90°F | 44°F | 0" | -- |
| 1974 | 89°F | 50°F | 0" | -- |
| 1973 | 94°F | 53°F | 0" | -- |
| 1972 | 64°F | 42°F | 0.35" | -- |
| 1971 | 81°F | 53°F | 0" | -- |
Based on 55 years of data from NOAA station: LONGMONT 2 ESE
Monthly Climate Averages
Historical temperature and precipitation averages for Longmont, CO, based on 55+ years of weather data.
Temperatures in Fahrenheit. Precipitation and snowfall in inches.