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October Weather in Longmont, United States

Last updated: June 24, 2025

In October, the average temperature in Longmont, United States hovers around 9°C (49°F), providing a cool atmosphere. Temperatures can vary significantly, with a minimum of -19°C (-2°F) and a maximum reaching 29°C (85°F). Expect about 38 mm (1.5 in) of precipitation spread over 6 days, contributing to an average humidity of 72%. Embrace the season's variety!

October Temperature in Longmont

In October in Longmont, the average temperature is 9°C (49°F). The maximum can reach 29°C (85°F), while the minimum can drop as low as -19°C (-2°F). Be prepared for a wide range of temperatures when traveling to Longmont during this month.

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

The chart illustrates October 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, October typically has an average temperature of 9°C (49°F), with highs reaching up to 29°C (85°F) and lows dropping to around -19°C (-2°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.

October Precipitation in Longmont

In Longmont in October, the total precipitation amount is 38 mm (1.5 in) spread over 6 days.

October Precipitation Trends in Longmont

The chart displays monthly precipitation patterns in Longmont, with values for each month alongside October’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how October’s conditions compare to those of other months. In Longmont, October typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1926565511942314327382315
Data source: Precipitation data for October generated using information from the Copernicus Climate Change Service.
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October Humidity in Longmont

In Longmont in October, humidity is 72%. With an average temperature of 9°C (49°F), this humidity feels like a chilly blanket wrapped around you, making travel feel damp and somewhat uncomfortable as you navigate the streets, heightening your awareness of every breeze.

October Average Humidity in Longmont

This chart illustrates the average monthly humidity levels in Longmont, with October’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In October, average humidity in Longmont is approximately 72%, 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 October generated using information from the Copernicus Climate Change Service.

October UV Index in Longmont

In Longmont in October, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Longmont, you can refer to this Hourly UV Index in Longmont.

Maximum UV Index Levels in Longmont for October

The chart shows the monthly maximum UV Index (UVI) for Longmont in October, 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 October, the maximum UV index in Longmont typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46811111212119643
Data source: Longmont October 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 October 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 October’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 October’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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