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September Weather in Caldwell, United States

Last updated: June 24, 2025

In September, the average temperature in Caldwell, United States is a pleasant 24°C (75°F). Expect a cozy minimum of 6°C (42°F) while the maximum can soar to 38°C (100°F). During this month, you can anticipate about 77 mm (3.0 in) of precipitation spread over 6 days, along with an average humidity of 67%. Enjoy the balanced climate that Caldwell has to offer!

September Temperature in Caldwell

In September in Caldwell, the average temperature is 24°C (75°F). Maximums can reach 38°C (100°F) and minimums can be as low as 6°C (42°F). Travelers should be prepared for warm days and cool nights, making it a perfect time for explorations and outdoor activities.

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 24°C (75°F), with highs reaching up to 38°C (100°F) and lows dropping to around 6°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec363751576879828075604741
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 total precipitation amount is 77 mm (3.0 in) occurring over a span of 6 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 77 mm (3.0 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec443188891721235296771272530
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 67%. With an average temperature of 24°C (75°F), this humidity feels like a warm and sticky embrace, making traveling a bit uncomfortable as you find yourself seeking shade and refreshing drinks more often.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%76%67%70%82%82%81%76%67%72%80%83%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
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 Weather2°C (36°F)44 mm (1.7 inches)75%moderate
February Weather3°C (37°F)31 mm (1.2 inches)76%high
March Weather10°C (51°F)88 mm (3.5 inches)67%high
April Weather14°C (58°F)89 mm (3.5 inches)70%very high
May Weather20°C (68°F)172 mm (6.8 inches)82%very high
June Weather26°C (79°F)123 mm (4.8 inches)82%extreme
July Weather28°C (82°F)51 mm (2.0 inches)81%extreme
August Weather26°C (80°F)96 mm (3.8 inches)76%very high
September Weather24°C (75°F)77 mm (3.0 inches)67%very high
October Weather15°C (60°F)127 mm (5.0 inches)72%high
November Weather9°C (48°F)25 mm (1.0 inches)80%moderate
December Weather5°C (41°F)30 mm (1.2 inches)83%moderate

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