Climate averages 1991–2020
Longmont weather
in July.
A hot, moderately wet month: the warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a hot month in Longmont: daytime highs average 29.5°C and nights cool to about 15.0°C. By daytime temperature it is the warmest month of the year.
Expect about 42 mm of rain on roughly 7 days, which makes July a moderately wet month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 44 min on an average July day.
The nearest other city in this atlas is Boulder (22 km away). In July its highs average 28.7°C, 0.8°C cooler than Longmont, with 75 mm of rain.
Among the 498 cities listed in the United States, Longmont ranks joint 286th of 498 for the warmest July highs and joint 187th of 498 for the driest July (rainfall, lowest first). The mean July high of those 498 cities is 30.3°C; Longmont is 0.8°C cooler than that mean.
From July to August, average highs fall by 1.1°C to 28.3°C, and monthly rainfall falls from 42 mm to 39 mm.
The annual picture
July in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Longmont climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 4.5°C-8.4°C | -8.4°C | 19 | 4.7 | 9.710 h |
| February | 5.9°C-7.6°C | -7.6°C | 20 | 5.3 | 10.611 h |
| March | 11.0°C-3.9°C | -3.9°C | 42 | 7.3 | 11.912 h |
| April | 14.8°C0.4°C | 0.4°C | 67 | 9.5 | 13.213 h |
| May | 19.9°C5.9°C | 5.9°C | 87 | 11.7 | 14.414 h |
| June | 26.0°C11.4°C | 11.4°C | 53 | 8.4 | 15.015 h |
| July, selected | 29.5°C15.0°C | 15.0°C | 42 | 7.3 | 14.715 h |
| August | 28.3°C14.3°C | 14.3°C | 39 | 6.7 | 13.814 h |
| September | 24.2°C9.9°C | 9.9°C | 39 | 5.9 | 12.512 h |
| October | 16.8°C3.2°C | 3.2°C | 41 | 6.5 | 11.211 h |
| November | 9.4°C-3.6°C | -3.6°C | 28 | 5.8 | 10.010 h |
| December | 4.2°C-8.1°C | -8.1°C | 18 | 4.5 | 9.49 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Boulder in JulyUnited States · 22 kmHigh 28.7°C · Low 14.4°C · 75 mm rain
- Loveland in JulyUnited States · 26 kmHigh 29.2°C · Low 14.7°C · 44 mm rain
- Thornton in JulyUnited States · 35 kmHigh 29.2°C · Low 14.5°C · 41 mm rain
- Westminster (Colorado), United States in JulyUnited States · 37 kmHigh 29.3°C · Low 14.5°C · 41 mm rain
- Arvada in JulyUnited States · 41 kmHigh 29.1°C · Low 14.4°C · 41 mm rain
- Greeley in JulyUnited States · 44 kmHigh 31.9°C · Low 17.1°C · 36 mm rain
- Fort Collins in JulyUnited States · 47 kmHigh 29.3°C · Low 14.7°C · 44 mm rain
- Denver in JulyUnited States · 49 kmHigh 29.4°C · Low 14.6°C · 41 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Longmont) is explained once on the Longmont year overview and on the Sources, method and limits page.