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September Weather in Holtville, United States

Last updated: June 24, 2025

In Holtville, United States, the average temperature in September hovers around 25°C (78°F). Expect a minimum of 12°C (55°F) and a potential maximum of 37°C (99°F), providing a wide range of weather. Be prepared for about 93 mm (3.6 in) of precipitation spread over 9 days, contributing to an average humidity of 73%.

September Temperature in Holtville

In September in Holtville, the average temperature is 25°C (78°F). Maximum temperatures can reach up to 37°C (99°F), while minimums can drop as low as 12°C (55°F). Therefore, it's a great time to visit Holtville if you enjoy warm weather with the possibility of cooler evenings.

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

The chart illustrates September temperature patterns in Holtville, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Holtville, September typically has an average temperature of 25°C (78°F), with highs reaching up to 37°C (99°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec485459647378818077695551
Data source: Temperature data for Holtville 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 Holtville

In Holtville in September, the precipitation amount is 93 mm (3.6 in) during a span of 9 days.

September Precipitation Trends in Holtville

The chart displays monthly precipitation patterns in Holtville, 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 Holtville, September typically receives around 93 mm (3.6 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1221471291371281461161119311982148
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Holtville

In Holtville in September, humidity is 73%. With an average temperature of 25°C (78°F), this humidity feels like stepping into a warm, heavy blanket that wraps around you, making travel feel sluggish and requiring regular breaks to stay refreshed.

September Average Humidity in Holtville

This chart illustrates the average monthly humidity levels in Holtville, 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 Holtville is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%81%77%77%72%73%73%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Holtville

In Holtville 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 Holtville.

Maximum UV Index Levels in Holtville for September

The chart shows the monthly maximum UV Index (UVI) for Holtville 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 Holtville typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111119864
Data source: Holtville 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 Holtville Compares to Other Months

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

This table compares monthly weather conditions in Holtville, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (48°F)122 mm (4.8 inches)85%moderate
February Weather12°C (54°F)147 mm (5.8 inches)84%high
March Weather15°C (60°F)129 mm (5.1 inches)82%very high
April Weather18°C (65°F)137 mm (5.4 inches)82%very high
May Weather23°C (73°F)128 mm (5.0 inches)81%extreme
June Weather26°C (78°F)146 mm (5.7 inches)77%extreme
July Weather27°C (81°F)116 mm (4.6 inches)77%extreme
August Weather27°C (81°F)111 mm (4.4 inches)72%extreme
September Weather25°C (78°F)93 mm (3.6 inches)73%very high
October Weather20°C (69°F)119 mm (4.7 inches)73%very high
November Weather13°C (55°F)82 mm (3.2 inches)85%high
December Weather11°C (51°F)148 mm (5.8 inches)88%moderate

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