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September Weather in Loma Linda, United States

Last updated: June 24, 2025

In September, the average temperature in Loma Linda, United States is a pleasant 23°C (74°F). Temperatures can range from a cool 7°C (44°F) at night to a warm 35°C (95°F) during the day. Expect about 73 mm (2.9 in) of precipitation over 6 days, accompanied by an average humidity of 64%.

September Temperature in Loma Linda

In September in Loma Linda, the average temperature is 23°C (74°F). Maximums can reach 35°C (95°F) and minimums can drop as low as 7°C (44°F). This diverse temperature range makes it a great time for travelers to experience both warm days and cooler evenings.

September Weather in Loma Linda: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Loma Linda, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Loma Linda, September typically has an average temperature of 23°C (74°F), with highs reaching up to 35°C (95°F) and lows dropping to around 7°C (44°F).
JanFebMarAprMayJunJulAugSepOctNovDec363951576777807874604742
Data source: Temperature data for Loma Linda 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 Loma Linda

In Loma Linda in September, the precipitation amount is 73 mm (2.9 in) over a span of 6 days.

September Precipitation Trends in Loma Linda

The chart displays monthly precipitation patterns in Loma Linda, 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 Loma Linda, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec82711431361888694108731405850
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Loma Linda

In Loma Linda in September, humidity is 64%. With an average temperature of 23°C (74°F), this humidity feels like a warm blanket wrapping around you, making outdoor exploration enjoyable yet slightly sticky, so it's best to stay hydrated and take breaks in the shade while traveling.

September Average Humidity in Loma Linda

This chart illustrates the average monthly humidity levels in Loma Linda, 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 Loma Linda is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%78%76%78%83%83%78%68%64%70%83%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Loma Linda

In Loma Linda in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Loma Linda.

Maximum UV Index Levels in Loma Linda for September

The chart shows the monthly maximum UV Index (UVI) for Loma Linda 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 Loma Linda typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Loma Linda 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 Loma Linda Compares to Other Months

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

This table compares monthly weather conditions in Loma Linda, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (37°F)82 mm (3.2 inches)81%moderate
February Weather4°C (39°F)71 mm (2.8 inches)78%high
March Weather10°C (51°F)143 mm (5.6 inches)76%high
April Weather14°C (57°F)136 mm (5.3 inches)78%very high
May Weather20°C (67°F)188 mm (7.4 inches)83%very high
June Weather25°C (77°F)86 mm (3.4 inches)83%extreme
July Weather27°C (80°F)94 mm (3.7 inches)78%extreme
August Weather25°C (78°F)108 mm (4.2 inches)68%very high
September Weather23°C (74°F)73 mm (2.9 inches)64%very high
October Weather15°C (60°F)140 mm (5.5 inches)70%high
November Weather9°C (48°F)58 mm (2.3 inches)83%moderate
December Weather6°C (42°F)49 mm (1.9 inches)87%moderate

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