September Weather in Glen Lyon, United States

Last updated: June 24, 2025

In Glen Lyon, United States, the average temperature in September hovers around 18°C (65°F). While you might enjoy pleasant days, be prepared for temperatures that can dip as low as 2°C (36°F) or soar to a maximum of 31°C (89°F). Expect some rain too, with a total precipitation of 102 mm (4.0 in) spread over 9 days. On top of that, the average humidity sits at a comfortable 66%, making the climate feel just right for outdoor adventures!

September Temperature in Glen Lyon

In September, in Glen Lyon, the average temperature is 18°C (65°F). Maximums can reach 31°C (89°F) and minimums can be as low as 2°C (36°F). This makes Glen Lyon an ideal destination for travelers seeking a mild climate with the possibility of warm days and cool evenings.

September Weather in Glen Lyon: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Glen Lyon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Glen Lyon, September typically has an average temperature of 18°C (65°F), with highs reaching up to 31°C (89°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec283237485968737165554034
Data source: Temperature data for Glen Lyon 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.

September Precipitation in Glen Lyon

In Glen Lyon in September, the total precipitation amount is 102 mm (4.0 in) over a span of 9 days.

September Precipitation Trends in Glen Lyon

The chart displays monthly precipitation patterns in Glen Lyon, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Glen Lyon, September typically receives around 102 mm (4.0 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec719688102122951181211021148783
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Glen Lyon

In Glen Lyon in September humidity is 66%. With an average temperature of 18°C (65°F), this humidity feels like a warm embrace, making travel comfortable yet slightly sticky, perfect for leisurely strolls but requiring light, breathable clothing to fully enjoy the experience.

September Average Humidity in Glen Lyon

This chart illustrates the average monthly humidity levels in Glen Lyon, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Glen Lyon is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Glen Lyon

In Glen Lyon in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Glen Lyon.

Maximum UV Index Levels in Glen Lyon for September

The chart shows the monthly maximum UV Index (UVI) for Glen Lyon in September, 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 September, the maximum UV index in Glen Lyon typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Glen Lyon September 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 September Weather in Glen Lyon Compares to Other Months

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

This table compares monthly weather conditions in Glen Lyon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)71 mm (2.8 inches)87%moderate
February Weather0°C (32°F)96 mm (3.8 inches)85%moderate
March Weather3°C (38°F)88 mm (3.5 inches)85%high
April Weather9°C (49°F)102 mm (4.0 inches)83%very high
May Weather15°C (60°F)122 mm (4.8 inches)75%very high
June Weather20°C (68°F)95 mm (3.7 inches)73%very high
July Weather23°C (74°F)118 mm (4.6 inches)65%very high
August Weather22°C (72°F)121 mm (4.8 inches)62%very high
September Weather18°C (65°F)102 mm (4.0 inches)66%very high
October Weather13°C (55°F)114 mm (4.5 inches)79%high
November Weather5°C (41°F)87 mm (3.4 inches)87%moderate
December Weather1°C (34°F)83 mm (3.3 inches)85%low

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