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September Weather in Castile, United States

Last updated: June 24, 2025

In September, the average temperature in Castile, United States hovers around 17°C (63°F), with a range that can dip to a cool 1°C (35°F) or rise to a warm 32°C (89°F). Expect about 70 mm (2.8 in) of precipitation spread over 9 days, contributing to a humidity level of 76% that can make the air feel quite tropical.

September Temperature in Castile

In September, in Castile, the average temperature is 17°C (63°F). The maximum can reach 32°C (89°F) and the minimum can be as low as 1°C (35°F). This diverse range in temperatures makes Castile an excellent destination for travelers looking to experience both warm and cool weather.

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

The chart illustrates September temperature patterns in Castile, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Castile, September typically has an average temperature of 17°C (63°F), with highs reaching up to 32°C (89°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec252834455766716963523831
Data source: Temperature data for Castile 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 Castile

In Castile in September, the total precipitation amount is 70 mm (2.8 in) spread over 9 days.

September Precipitation Trends in Castile

The chart displays monthly precipitation patterns in Castile, 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 Castile, September typically receives around 70 mm (2.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7784761121139213593701348790
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Castile

In Castile in September humidity is 76%. With an average temperature of 17°C (63°F), this humidity feels like traveling through a warm, enveloping blanket, making every outdoor adventure feel sticky and heavy, yet pleasantly refreshing when you find a cool breeze.

September Average Humidity in Castile

This chart illustrates the average monthly humidity levels in Castile, 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 Castile is approximately 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Castile

In Castile 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 Castile.

Maximum UV Index Levels in Castile for September

The chart shows the monthly maximum UV Index (UVI) for Castile 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 Castile typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec346810101098642
Data source: Castile 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 Castile Compares to Other Months

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

This table compares monthly weather conditions in Castile, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (26°F)77 mm (3.0 inches)91%moderate
February Weather-2°C (28°F)84 mm (3.3 inches)91%moderate
March Weather1°C (34°F)76 mm (3.0 inches)88%high
April Weather7°C (45°F)112 mm (4.4 inches)88%very high
May Weather14°C (58°F)113 mm (4.4 inches)82%very high
June Weather19°C (67°F)92 mm (3.6 inches)79%very high
July Weather22°C (71°F)135 mm (5.3 inches)77%very high
August Weather21°C (70°F)93 mm (3.7 inches)72%very high
September Weather17°C (63°F)70 mm (2.8 inches)76%very high
October Weather11°C (53°F)134 mm (5.3 inches)83%high
November Weather3°C (38°F)87 mm (3.4 inches)88%moderate
December Weather-1°C (31°F)90 mm (3.5 inches)87%low

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