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September Weather in Catalina, United States

Last updated: June 24, 2025

In Catalina, United States, the average temperature in September hovers around 27°C (81°F), making it a warm destination. However, be prepared for temperature fluctuations, with a minimum of 12°C (55°F) and a maximum reaching up to 40°C (105°F). During this month, you can expect 34 mm (1.3 in) of precipitation spread over 4 days, contributing to an average humidity of 64%. Whether you prefer sunny skies or seasonal showers, Catalina in September offers a climate that caters to all!

September Temperature in Catalina

In September in Catalina, the average temperature is 27°C (81°F). Maximums can reach 40°C (105°F) and minimums can be as low as 12°C (55°F). This makes it essential for travelers to pack a variety of clothing options to enjoy both warm and cooler moments throughout the day.

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

The chart illustrates September temperature patterns in Catalina, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Catalina, September typically has an average temperature of 27°C (81°F), with highs reaching up to 40°C (105°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec515360697686868581716252
Data source: Temperature data for Catalina 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 Catalina

In Catalina in September, the precipitation amount is 34 mm (1.3 in) over a span of 4 days.

September Precipitation Trends in Catalina

The chart displays monthly precipitation patterns in Catalina, 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 Catalina, September typically receives around 34 mm (1.3 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec344222359966334122131
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Catalina

In Catalina in September humidity is 64%. With an average temperature of 27°C (81°F), this humidity feels like a warm embrace, making travel enjoyable yet slightly sticky, as you explore the sights under the bright sun.

September Average Humidity in Catalina

This chart illustrates the average monthly humidity levels in Catalina, 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 Catalina is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%79%67%55%40%33%34%48%64%67%77%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Catalina

In Catalina in September, 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 Catalina.

Maximum UV Index Levels in Catalina for September

The chart shows the monthly maximum UV Index (UVI) for Catalina 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 Catalina typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579111212121111864
Data source: Catalina 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 Catalina Compares to Other Months

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

This table compares monthly weather conditions in Catalina, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)34 mm (1.3 inches)76%moderate
February Weather12°C (53°F)42 mm (1.7 inches)79%high
March Weather15°C (60°F)22 mm (0.9 inches)67%very high
April Weather21°C (69°F)3 mm (0.1 inches)55%extreme
May Weather24°C (76°F)5 mm (0.2 inches)40%extreme
June Weather30°C (86°F)9 mm (0.3 inches)33%extreme
July Weather30°C (86°F)96 mm (3.8 inches)34%extreme
August Weather29°C (85°F)63 mm (2.5 inches)48%extreme
September Weather27°C (81°F)34 mm (1.3 inches)64%extreme
October Weather22°C (71°F)12 mm (0.5 inches)67%very high
November Weather17°C (62°F)21 mm (0.8 inches)77%high
December Weather11°C (52°F)31 mm (1.2 inches)82%moderate

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