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September Weather in Keyes, United States

Last updated: June 24, 2025

In September, the average temperature in Keyes, United States is a pleasant 25°C (77°F). However, temperatures can vary significantly, with a minimum of 10°C (51°F) and a maximum soaring up to 43°C (110°F). Expect very little rain, with only 1 mm (0.0 in) of precipitation over 0 days. The climate remains comfortable with an average humidity level of 55%.

September Temperature in Keyes

In September, in Keyes, the average temperature is 25°C (77°F). Maximums can reach 43°C (110°F), while minimums can drop to as low as 10°C (51°F). Be prepared for warm days and cooler nights while enjoying your travels!

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

The chart illustrates September temperature patterns in Keyes, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Keyes, September typically has an average temperature of 25°C (77°F), with highs reaching up to 43°C (110°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec515357647179848277675750
Data source: Temperature data for Keyes 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 Keyes

In Keyes in September, the precipitation amount is 1 mm (0.0 in) during a span of 0 days.

September Precipitation Trends in Keyes

The chart displays monthly precipitation patterns in Keyes, 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 Keyes, September typically receives around 1 mm (0.0 inches) of precipitation spread over approximately 0 days.
JanFebMarAprMayJunJulAugSepOctNovDec90667128153001153079
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Keyes

In Keyes in September humidity is 55%. With an average temperature of 25°C (77°F), this humidity feels like a warm, enveloping blanket that makes the air feel heavier, encouraging leisurely strolls and inviting you to explore the vibrant surroundings at a comfortable pace.

September Average Humidity in Keyes

This chart illustrates the average monthly humidity levels in Keyes, 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 Keyes is approximately 55%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%84%82%78%71%64%59%54%55%62%78%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Keyes

In Keyes 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 Keyes.

Maximum UV Index Levels in Keyes for September

The chart shows the monthly maximum UV Index (UVI) for Keyes 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 Keyes typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3589101111109743
Data source: Keyes 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 Keyes Compares to Other Months

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

This table compares monthly weather conditions in Keyes, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather10°C (51°F)90 mm (3.5 inches)82%moderate
February Weather12°C (54°F)66 mm (2.6 inches)84%moderate
March Weather14°C (58°F)71 mm (2.8 inches)82%very high
April Weather18°C (64°F)27 mm (1.1 inches)78%very high
May Weather22°C (72°F)15 mm (0.6 inches)71%very high
June Weather26°C (80°F)3 mm (0.1 inches)64%extreme
July Weather29°C (84°F)0 mm (0.0 inches)58%extreme
August Weather28°C (82°F)0 mm (0.0 inches)54%very high
September Weather25°C (77°F)1 mm (0.0 inches)55%very high
October Weather19°C (67°F)15 mm (0.6 inches)62%high
November Weather14°C (57°F)30 mm (1.2 inches)78%moderate
December Weather10°C (50°F)79 mm (3.1 inches)80%moderate

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