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September Weather in San Manuel, United States

Last updated: June 24, 2025

In September, the average temperature in San Manuel, United States hovers around 25°C (77°F), with a minimum dipping to 12°C (53°F) and a maximum soaring to 37°C (99°F). Expect 43 mm (1.7 in) of precipitation spread across 6 days, accompanied by an average humidity of 64%. Perfect for planning your outdoor adventures!

September Temperature in San Manuel

In September, in San Manuel, the average temperature is 25°C (77°F). Maximum temperatures can reach 37°C (99°F), while minimums can drop to as low as 12°C (53°F). This makes San Manuel an ideal destination for travelers seeking warm weather, but it's wise to pack for varying conditions.

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

The chart illustrates September temperature patterns in San Manuel, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Manuel, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec485056667283828077675949
Data source: Temperature data for San Manuel 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 Manuel

In San Manuel in September, the precipitation amount is 43 mm (1.7 in) over a period of 6 days.

September Precipitation Trends in San Manuel

The chart displays monthly precipitation patterns in San Manuel, 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 Manuel, September typically receives around 43 mm (1.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec43553158141129243212443
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Manuel

In San Manuel in September, humidity is 64%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace, making outdoor excursions feel a bit heavier, yet still inviting for travelers seeking a vibrant atmosphere.

September Average Humidity in San Manuel

This chart illustrates the average monthly humidity levels in San Manuel, 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 Manuel 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 San Manuel

In San Manuel 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 San Manuel.

Maximum UV Index Levels in San Manuel for September

The chart shows the monthly maximum UV Index (UVI) for San Manuel 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 Manuel typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec5710111213121111865
Data source: San Manuel 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 Manuel Compares to Other Months

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

This table compares monthly weather conditions in San Manuel, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)43 mm (1.7 inches)76%moderate
February Weather10°C (50°F)55 mm (2.2 inches)79%high
March Weather13°C (56°F)31 mm (1.2 inches)67%very high
April Weather19°C (66°F)5 mm (0.2 inches)55%extreme
May Weather22°C (73°F)8 mm (0.3 inches)40%extreme
June Weather28°C (83°F)14 mm (0.6 inches)33%extreme
July Weather28°C (82°F)112 mm (4.4 inches)34%extreme
August Weather27°C (81°F)92 mm (3.6 inches)48%extreme
September Weather25°C (77°F)43 mm (1.7 inches)64%extreme
October Weather20°C (68°F)21 mm (0.8 inches)67%very high
November Weather15°C (59°F)24 mm (0.9 inches)77%high
December Weather9°C (49°F)43 mm (1.7 inches)82%moderate

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