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September Weather in San Clemente, Chile

Last updated: August 22, 2025

In September, the average temperature in San Clemente, Chile is a pleasant 11°C (53°F). Expect lows of 1°C (34°F) and highs reaching 26°C (80°F), making for a comfortable range. The region experiences an average precipitation of 69 mm (2.7 in) over 6 days, while humidity hovers around 62%, creating a refreshing atmosphere.

September Temperature in San Clemente

In September in San Clemente, the average temperature is 11°C (53°F). Maximum temperatures can reach 26°C (80°F), while minimums can drop as low as 1°C (34°F). This diverse range of temperatures makes it essential to pack layers for your travels.

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

The chart illustrates September temperature patterns in San Clemente, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In San Clemente, September typically has an average temperature of 11°C (53°F), with highs reaching up to 26°C (80°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec706964585248474952566368
Data source: Temperature data for San Clemente 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 Clemente

In San Clemente in September, the precipitation amount is 69 mm (2.7 in) over a period of 6 days.

September Precipitation Trends in San Clemente

The chart displays monthly precipitation patterns in San Clemente, 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 Clemente, September typically receives around 69 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec14101134902111021236944193
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in San Clemente

In San Clemente in September, humidity is 62%. With an average temperature of 11°C (53°F), this humidity feels like a cool, crisp breeze that adds a slight chill to the air, making it essential to dress in layers while exploring the scenery.

September Average Humidity in San Clemente

This chart illustrates the average monthly humidity levels in San Clemente, 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 Clemente is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec40%41%46%54%70%78%82%79%62%64%53%39%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in San Clemente

In San Clemente in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in San Clemente.

Maximum UV Index Levels in San Clemente for September

The chart shows the monthly maximum UV Index (UVI) for San Clemente 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 Clemente typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec141311753458101314
Data source: San Clemente 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 Clemente Compares to Other Months

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

This table compares monthly weather conditions in San Clemente, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather21°C (70°F)14 mm (0.5 inches)40%extreme
February Weather21°C (69°F)10 mm (0.4 inches)41%extreme
March Weather18°C (65°F)11 mm (0.4 inches)46%extreme
April Weather14°C (58°F)34 mm (1.4 inches)54%high
May Weather11°C (52°F)90 mm (3.5 inches)70%moderate
June Weather9°C (48°F)211 mm (8.3 inches)78%moderate
July Weather8°C (47°F)102 mm (4.0 inches)82%moderate
August Weather9°C (49°F)123 mm (4.8 inches)79%moderate
September Weather11°C (53°F)69 mm (2.7 inches)62%very high
October Weather13°C (57°F)44 mm (1.7 inches)64%very high
November Weather17°C (63°F)19 mm (0.7 inches)53%extreme
December Weather20°C (68°F)3 mm (0.1 inches)39%extreme

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