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September Weather in San Jacinto, United States

Last updated: June 24, 2025

The average temperature in San Jacinto, United States for September is a pleasant 24°C (75°F). However, be prepared for temperature variations: it can dip as low as 9°C (48°F) and soar up to 44°C (112°F). During this time, expect minimal rainfall, with only 4 mm (0.2 in) of precipitation across 1 day. The average humidity sits at a comfortable 52%, making it an ideal month to explore!

September Temperature in San Jacinto

In September in San Jacinto, the average temperature is 24°C (75°F). Maximum temperatures can reach 44°C (112°F), while minimums can drop to as low as 9°C (48°F). Be prepared for a wide range of temperatures when traveling to San Jacinto in September.

September Weather in San Jacinto: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in San Jacinto, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Jacinto, September typically has an average temperature of 24°C (75°F), with highs reaching up to 44°C (112°F) and lows dropping to around 9°C (48°F).
JanFebMarAprMayJunJulAugSepOctNovDec515154616472797975665951
Data source: Temperature data for San Jacinto 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 San Jacinto

In San Jacinto in September, the precipitation amount is 4 mm (0.2 in) during 1 day.

September Precipitation Trends in San Jacinto

The chart displays monthly precipitation patterns in San Jacinto, 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 San Jacinto, September typically receives around 4 mm (0.2 inches) of precipitation spread over approximately 1 days.
JanFebMarAprMayJunJulAugSepOctNovDec71737031203534133066
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Jacinto

In San Jacinto in September humidity is 52%. With an average temperature of 24°C (75°F), this humidity feels like a comfortable warmth enveloping you, making it pleasant for outdoor activities and sightseeing, but you might feel the need for a light breeze or occasional shade to stay refreshed while exploring.

September Average Humidity in San Jacinto

This chart illustrates the average monthly humidity levels in San Jacinto, 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 San Jacinto is approximately 52%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec72%77%67%56%46%48%46%42%52%58%66%74%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Jacinto

In San Jacinto 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 San Jacinto.

Maximum UV Index Levels in San Jacinto for September

The chart shows the monthly maximum UV Index (UVI) for San Jacinto 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 San Jacinto typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469101112121110754
Data source: San Jacinto 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 San Jacinto Compares to Other Months

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

This table compares monthly weather conditions in San Jacinto, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)71 mm (2.8 inches)72%moderate
February Weather11°C (52°F)73 mm (2.9 inches)77%high
March Weather12°C (54°F)70 mm (2.8 inches)67%very high
April Weather16°C (61°F)31 mm (1.2 inches)56%very high
May Weather18°C (64°F)20 mm (0.8 inches)46%extreme
June Weather22°C (73°F)3 mm (0.1 inches)48%extreme
July Weather26°C (79°F)5 mm (0.2 inches)46%extreme
August Weather26°C (80°F)3 mm (0.1 inches)42%extreme
September Weather24°C (75°F)4 mm (0.2 inches)52%very high
October Weather19°C (67°F)13 mm (0.5 inches)58%high
November Weather15°C (59°F)30 mm (1.2 inches)66%moderate
December Weather11°C (52°F)66 mm (2.6 inches)74%moderate

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