July is one of the warmer months of the year in Longmont, with average highs near 31.5°C and lows around 15.8°C (mean 23.7°C). It is a relatively wet time of year, averaging 53 mm of rainfall and 42% relative humidity across the period.
July is one of the warmer months of the year in Longmont. Across 45 years of records, the warmest July in Longmont was 2003 — when the month averaged 26.2°C — while the coldest was 1992 at 21.2°C. Typical July days reach 31.5°C with nights near 15.8°C. The long-term trend is warming, about 0.5°C per decade.
July is a relatively wet time of year in Longmont, averaging 53 mm of rainfall. The wettest July on record was 2014 with 97 mm, while the driest was 2008 at 19 mm.
Relative humidity in Longmont during July averages 42%. The most humid July was 2015 at 51%, and the least humid was 2002 at 32%.
July receives about 6.5 kWh/m²/day of solar energy in Longmont. The sunniest July was 1993 at 7.3 kWh/m²/day, and the cloudiest were 1985 and 1990 at 5.9.
Average wind speed in Longmont during July is 2.2 m/s. The windiest July was 2020 at 2.5 m/s, while the calmest was 1992 at 1.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 23.1°C | 22.5°C | 24.5°C | 23.9°C | 24.7°C | +1.6°C |
| Avg High | 30.9°C | 30.3°C | 32.5°C | 31.5°C | 32.9°C | +2°C |
| Avg Low | 15.4°C | 14.7°C | 16.5°C | 16.2°C | 16.5°C | +1.1°C |
| Avg Rain | 53 mm | 60 mm | 47 mm | 58 mm | 43 mm | -11 mm |
July temperatures in Longmont have risen by about 1.7°C between 1981–1985 and 2021–2025.
July has ranged from a record low of 8°C (1987) to a record high of 38.9°C (2005).
Rainfall in July is a relatively wet time of year, averaging 53 mm, with a wettest year of 97 mm.
One of the best times to visit Longmont
July is one of the best times to visit Longmont. Expect days averaging 31.5°C and nights around 15.8°C (mean 23.7°C) — warmer than Longmont's yearly average — with moderate rainfall (53 mm), so conditions are generally comfortable for sightseeing and outdoor plans.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 33.5°C | 25.0°C | 16.5°C | 38.5°C | 13.3°C | 33 mm | 35% | 2.3 m/s | 6.4 |
| 2024 | 33.0°C | 24.4°C | 15.8°C | 38.9°C | 10.4°C | 29 mm | 34% | 2.2 m/s | 6.9 |
| 2023 | 32.0°C | 23.8°C | 15.6°C | 36.8°C | 10.9°C | 59 mm | 44% | 2.2 m/s | 6.5 |
| 2022 | 33.3°C | 25.3°C | 17.4°C | 38.4°C | 13.5°C | 56 mm | 40% | 2.3 m/s | 6.4 |
| 2021 | 32.2°C | 24.7°C | 17.2°C | 37.6°C | 13.8°C | 51 mm | 43% | 2.3 m/s | 6.3 |
| 2020 | 33.1°C | 24.8°C | 16.6°C | 37.7°C | 11.5°C | 28 mm | 37% | 2.5 m/s | 6.7 |
| 2019 | 32.2°C | 24.3°C | 16.4°C | 37.5°C | 10.9°C | 48 mm | 45% | 2.1 m/s | 6.8 |
| 2018 | 32.1°C | 24.3°C | 16.5°C | 37.0°C | 10.6°C | 43 mm | 45% | 2.3 m/s | 6.8 |
| 2017 | 32.0°C | 24.4°C | 16.8°C | 36.9°C | 11.5°C | 40 mm | 43% | 2.1 m/s | 6.2 |
| 2016 | 33.0°C | 24.7°C | 16.4°C | 37.1°C | 13.3°C | 27 mm | 38% | 2.2 m/s | 6.8 |
| 2015 | 28.9°C | 21.7°C | 14.5°C | 34.1°C | 9.5°C | 59 mm | 51% | 2.1 m/s | 6.4 |
| 2014 🌧️ | 30.2°C | 22.9°C | 15.6°C | 36.3°C | 9.6°C | 97 mm | 49% | 2.2 m/s | 6.3 |
| 2013 | 31.0°C | 23.4°C | 15.8°C | 37.2°C | 12.0°C | 51 mm | 45% | 2.2 m/s | 6.4 |
| 2012 | 32.8°C | 25.2°C | 17.6°C | 38.1°C | 14.4°C | 66 mm | 43% | 2.4 m/s | 6.2 |
| 2011 | 32.0°C | 24.2°C | 16.5°C | 36.1°C | 11.7°C | 87 mm | 49% | 2 m/s | 6.6 |
| 2010 | 31.1°C | 23.4°C | 15.7°C | 37.5°C | 8.7°C | 64 mm | 46% | 2.1 m/s | 6.7 |
| 2009 | 29.6°C | 21.8°C | 14.0°C | 35.0°C | 9.1°C | 78 mm | 50% | 2 m/s | 6.5 |
| 2008 | 33.4°C | 25.1°C | 16.9°C | 37.1°C | 12.9°C | 19 mm | 33% | 2.4 m/s | 6.7 |
| 2007 | 32.6°C | 25.0°C | 17.4°C | 36.8°C | 14.3°C | 43 mm | 41% | 2.4 m/s | 6.6 |
| 2006 | 31.5°C | 24.2°C | 16.8°C | 38.5°C | 10.5°C | 71 mm | 44% | 2.3 m/s | 6.2 |
| 2005 | 34.0°C | 25.3°C | 16.6°C | 38.9°C | 10.7°C | 23 mm | 35% | 2.3 m/s | 7 |
| 2004 | 29.8°C | 22.0°C | 14.2°C | 37.1°C | 9.3°C | 72 mm | 46% | 2.1 m/s | 6.3 |
| 2003 🔥 | 34.7°C | 26.2°C | 17.7°C | 38.6°C | 13.6°C | 31 mm | 33% | 2.3 m/s | 7 |
| 2002 | 34.0°C | 25.8°C | 17.5°C | 38.5°C | 13.7°C | 21 mm | 32% | 2.3 m/s | 7 |
| 2001 | 33.0°C | 25.1°C | 17.3°C | 37.3°C | 14.3°C | 71 mm | 41% | 2.2 m/s | 6.3 |
| 2000 | 32.8°C | 24.8°C | 16.7°C | 37.7°C | 12.7°C | 41 mm | 37% | 2.3 m/s | 6.8 |
| 1999 | 30.7°C | 23.4°C | 16.2°C | 36.3°C | 10.5°C | 70 mm | 46% | 2.4 m/s | 6.7 |
| 1998 | 30.5°C | 23.4°C | 16.3°C | 38.5°C | 12.6°C | 96 mm | 49% | 2.1 m/s | 6.9 |
| 1997 | 30.9°C | 22.8°C | 14.7°C | 36.9°C | 8.2°C | 75 mm | 40% | 2.2 m/s | 7 |
| 1996 | 30.8°C | 23.2°C | 15.7°C | 35.6°C | 12.6°C | 53 mm | 45% | 2.1 m/s | 6.5 |
| 1995 | 29.3°C | 21.5°C | 13.7°C | 37.0°C | 8.0°C | 38 mm | 46% | 1.9 m/s | 7 |
| 1994 | 31.7°C | 23.3°C | 14.8°C | 36.1°C | 9.0°C | 24 mm | 39% | 2.1 m/s | 6.3 |
| 1993 | 31.1°C | 22.3°C | 13.4°C | 35.6°C | 8.4°C | 31 mm | 40% | 2.2 m/s | 7.3 |
| 1992 ❄️ | 29.0°C | 21.2°C | 13.3°C | 36.0°C | 9.2°C | 48 mm | 45% | 1.8 m/s | 6.2 |
| 1991 | 29.6°C | 22.1°C | 14.5°C | 35.7°C | 9.5°C | 87 mm | 48% | 2.1 m/s | 6.2 |
| 1990 | 29.1°C | 21.6°C | 14.2°C | 38.8°C | 8.8°C | 74 mm | 49% | 2.3 m/s | 5.9 |
| 1989 | 31.9°C | 23.9°C | 16.0°C | 38.8°C | 13.6°C | 52 mm | 38% | 2.4 m/s | 6.6 |
| 1988 | 31.7°C | 23.7°C | 15.7°C | 37.5°C | 10.4°C | 34 mm | 40% | 2.3 m/s | 6 |
| 1987 | 31.5°C | 23.3°C | 15.1°C | 35.8°C | 8.0°C | 37 mm | 40% | 2.3 m/s | 6.6 |
| 1986 | 30.7°C | 22.8°C | 14.9°C | 35.3°C | 13.1°C | 42 mm | 41% | 2 m/s | 6.1 |
| 1985 | 29.8°C | 22.5°C | 15.3°C | 36.6°C | 12.2°C | 81 mm | 47% | 2.1 m/s | 5.9 |
| 1984 | 30.7°C | 23.3°C | 15.8°C | 36.2°C | 12.3°C | 53 mm | 45% | 2.1 m/s | 6.8 |
| 1983 | 30.0°C | 22.4°C | 14.8°C | 34.2°C | 8.1°C | 72 mm | 49% | 2.2 m/s | — |
| 1982 | 30.5°C | 22.8°C | 15.1°C | 37.4°C | 10.2°C | 52 mm | 40% | 2.1 m/s | — |
| 1981 | 31.1°C | 23.4°C | 15.6°C | 36.7°C | 11.6°C | 58 mm | 45% | 2.2 m/s | — |
Actual recorded July data for each year, 1981–2025 — sourced from NASA POWER.
The average high in July is around 31.5°C with lows near 15.8°C (mean 23.7°C), based on 45 years of NASA POWER data.
July averages 53 mm of rainfall in Longmont, a relatively wet time of year. The wettest on record was 97 mm in 2014.
The hottest July reached 38.9°C in 2005. The coldest dipped to 8°C in 1987.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average July temperatures have risen by about 1.7°C. Daytime highs moved from 30.4°C to 32.8°C and overnight lows from 15.3°C to 16.5°C over the same span.
July is one of the warmer months of the year in Longmont and a relatively wet time of year, so plan for around 31.5°C daytime highs and 15.8°C at night.
Not quite — July is the 12th coolest month in Longmont, averaging 23.7°C.
For July in Longmont, pack light, breathable clothing and sun protection, with typical highs of 31.5°C and lows of 15.8°C. Bring an umbrella or light rain jacket too.
Relative humidity in July averages 42% — relatively dry.
Average wind speed in July is 2.2 m/s. The windiest July on record averaged 2.5 m/s (2020).
The wettest July on record was 2014 with 97 mm. On average, July sees 53 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Longmont behaves each July, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for July specifically, along with year-by-year records and how the month has changed over the decades.
