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August Weather in Longmont, United States

Last updated: June 24, 2025

In August, the average temperature in Longmont, United States is a pleasant 22°C (73°F). Expect a range where the minimum can dip to 11°C (51°F) and the maximum might soar to 36°C (97°F). During this month, precipitation averages around 43 mm (1.7 in), typically spread over 6 days, while the average humidity holds steady at 63%.

August Temperature in Longmont

In August in Longmont, the average temperature is 22°C (73°F), with maximums reaching 36°C (97°F) and minimums dropping as low as 11°C (51°F). This variation in temperature makes it an ideal time for travelers to enjoy both warm days and cooler evenings while exploring the area.

August Weather in Longmont: Daily Temperature Highs, Lows, and Averages

The chart illustrates August temperature patterns in Longmont, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Longmont, August typically has an average temperature of 22°C (73°F), with highs reaching up to 36°C (97°F) and lows dropping to around 11°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec303040485668747266494033
Data source: Temperature data for Longmont generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

August Precipitation in Longmont

In Longmont in August, the precipitation amount is 43 mm (1.7 in) over a period of 6 days.

August Precipitation Trends in Longmont

The chart displays monthly precipitation patterns in Longmont, with values for each month alongside August’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how August’s conditions compare to those of other months. In Longmont, August typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1926565511942314327382315
Data source: Precipitation data for August generated using information from the Copernicus Climate Change Service.
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August Humidity in Longmont

In Longmont in August humidity is 63%. With an average temperature of 22°C (73°F), this humidity feels like a warm embrace, making travel enjoyable yet potentially a little sticky, so staying hydrated and taking breaks in shaded areas is key for a pleasant experience.

August Average Humidity in Longmont

This chart illustrates the average monthly humidity levels in Longmont, with August’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In August, average humidity in Longmont is approximately 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%86%75%67%67%68%62%63%63%72%80%85%
Data source: Humidity data for August generated using information from the Copernicus Climate Change Service.

August UV Index in Longmont

In Longmont in August, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Longmont.

Maximum UV Index Levels in Longmont for August

The chart shows the monthly maximum UV Index (UVI) for Longmont in August, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In August, the maximum UV index in Longmont typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46811111212119643
Data source: Longmont August UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How August Weather in Longmont Compares to Other Months

Weather in Longmont varies notably across the year, with each month offering distinct climate conditions. This page compares August’s weather to other months in Longmont, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Longmont, showing how August’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)19 mm (0.8 inches)84%moderate
February Weather-1°C (30°F)26 mm (1.0 inches)85%high
March Weather5°C (40°F)56 mm (2.2 inches)75%very high
April Weather9°C (48°F)55 mm (2.2 inches)67%extreme
May Weather13°C (56°F)119 mm (4.7 inches)67%extreme
June Weather20°C (69°F)42 mm (1.6 inches)68%extreme
July Weather23°C (75°F)31 mm (1.2 inches)62%extreme
August Weather22°C (73°F)43 mm (1.7 inches)63%extreme
September Weather19°C (66°F)27 mm (1.1 inches)63%very high
October Weather9°C (49°F)38 mm (1.5 inches)72%high
November Weather4°C (40°F)23 mm (0.9 inches)79%moderate
December Weather0°C (33°F)15 mm (0.6 inches)85%moderate

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