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September Weather in Crestline, United States

Last updated: June 24, 2025

In September, the average temperature in Crestline, United States is a pleasant 23°C (74°F). However, temperatures can range widely, with a minimum of 9°C (48°F) and a scorching maximum of 42°C (108°F). Expect some light rain, with an average precipitation of just 9 mm (0.4 in) over the span of 2 days. The average humidity sits at 41%, making for a comfortable atmosphere.

September Temperature in Crestline

In September in Crestline, the average temperature is 23°C (74°F), with maximums reaching 42°C (108°F) and minimums dropping as low as 9°C (48°F). This variety in temperature makes Crestline an ideal destination for travelers seeking both warm days and cooler evenings.

September Weather in Crestline: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Crestline, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Crestline, September typically has an average temperature of 23°C (74°F), with highs reaching up to 42°C (108°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec484952596373797974645748
Data source: Temperature data for Crestline 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 Crestline

In Crestline in September, the precipitation amount is 9 mm (0.4 in) over the course of 2 days.

September Precipitation Trends in Crestline

The chart displays monthly precipitation patterns in Crestline, 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 Crestline, September typically receives around 9 mm (0.4 inches) of precipitation spread over approximately 2 days.
JanFebMarAprMayJunJulAugSepOctNovDec515653241341211981956
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Crestline

In Crestline in September humidity is 41%. With an average temperature of 23°C (74°F), this humidity feels like a comfortable breeze, making it pleasant for traveling and exploring the sights without the discomfort of excessive moisture in the air.

September Average Humidity in Crestline

This chart illustrates the average monthly humidity levels in Crestline, 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 Crestline is approximately 41%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%69%57%45%34%29%28%42%54%68%75%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Crestline

In Crestline in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Crestline.

Maximum UV Index Levels in Crestline for September

The chart shows the monthly maximum UV Index (UVI) for Crestline 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 Crestline typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469111112121110854
Data source: Crestline 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 Crestline Compares to Other Months

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

This table compares monthly weather conditions in Crestline, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)51 mm (2.0 inches)76%moderate
February Weather9°C (49°F)56 mm (2.2 inches)80%high
March Weather11°C (52°F)52 mm (2.1 inches)69%very high
April Weather15°C (60°F)24 mm (0.9 inches)57%extreme
May Weather17°C (64°F)13 mm (0.5 inches)45%extreme
June Weather23°C (73°F)4 mm (0.1 inches)34%extreme
July Weather26°C (79°F)12 mm (0.5 inches)29%extreme
August Weather26°C (79°F)11 mm (0.4 inches)28%extreme
September Weather23°C (74°F)9 mm (0.4 inches)41%very high
October Weather18°C (65°F)8 mm (0.3 inches)54%very high
November Weather14°C (57°F)19 mm (0.8 inches)68%moderate
December Weather9°C (49°F)56 mm (2.2 inches)75%moderate

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