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September Weather in Caldwell, United States

Last updated: June 24, 2025

In September, the average temperature in Caldwell, United States hovers around 27°C (81°F). Expect a range from a cool 11°C (52°F) to a sizzling 39°C (102°F). This month also brings about 127 mm (5.0 in) of precipitation spread across 11 days, contributing to an average humidity of 69%. Enjoy the dynamic weather as you plan your activities!

September Temperature in Caldwell

In September in Caldwell, the average temperature is 27°C (81°F). Maximum temperatures can reach 39°C (102°F), while minimums can drop as low as 11°C (52°F). This diverse temperature range makes Caldwell an ideal destination for travelers looking to experience both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Caldwell, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Caldwell, September typically has an average temperature of 27°C (81°F), with highs reaching up to 39°C (102°F) and lows dropping to around 11°C (52°F).
JanFebMarAprMayJunJulAugSepOctNovDec525464687782858681716055
Data source: Temperature data for Caldwell 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 Caldwell

In Caldwell in September, the precipitation amount is 127 mm (5.0 in), occurring over 11 days.

September Precipitation Trends in Caldwell

The chart displays monthly precipitation patterns in Caldwell, 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 Caldwell, September typically receives around 127 mm (5.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec7073751371561158511912710272101
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Caldwell

In Caldwell in September, humidity is 69%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket wrapped around you, making it essential to stay hydrated and take frequent breaks during your travels.

September Average Humidity in Caldwell

This chart illustrates the average monthly humidity levels in Caldwell, 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 Caldwell is approximately 69%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%80%78%79%81%77%71%67%69%73%82%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Caldwell

In Caldwell in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Caldwell.

Maximum UV Index Levels in Caldwell for September

The chart shows the monthly maximum UV Index (UVI) for Caldwell 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 Caldwell typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121110865
Data source: Caldwell 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 Caldwell Compares to Other Months

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

This table compares monthly weather conditions in Caldwell, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather11°C (52°F)70 mm (2.8 inches)79%moderate
February Weather12°C (54°F)73 mm (2.9 inches)80%very high
March Weather18°C (64°F)75 mm (3.0 inches)78%very high
April Weather20°C (69°F)137 mm (5.4 inches)79%extreme
May Weather25°C (77°F)156 mm (6.1 inches)81%extreme
June Weather28°C (83°F)115 mm (4.5 inches)77%extreme
July Weather29°C (85°F)85 mm (3.4 inches)71%extreme
August Weather30°C (87°F)119 mm (4.7 inches)67%extreme
September Weather27°C (81°F)127 mm (5.0 inches)69%very high
October Weather22°C (71°F)102 mm (4.0 inches)73%very high
November Weather16°C (61°F)72 mm (2.8 inches)82%high
December Weather13°C (56°F)101 mm (4.0 inches)87%moderate

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