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September Weather in Black Diamond, United States

Last updated: June 24, 2025

In Black Diamond, United States, the average temperature in September typically hovers around 15°C (59°F). However, temperatures can vary significantly, with a minimum of 3°C (38°F) and a maximum reaching up to 31°C (89°F). During this month, you can expect around 105 mm (4.1 in) of precipitation spread across 12 days, accompanied by an average humidity of 62%.

September Temperature in Black Diamond

In September in Black Diamond, the average temperature is 15°C (59°F). The maximum can reach 31°C (89°F) and the minimum can be as low as 3°C (38°F). Pack for warm days and cool nights, and enjoy the diverse climate this month!

September Weather in Black Diamond: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Black Diamond, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Black Diamond, September typically has an average temperature of 15°C (59°F), with highs reaching up to 31°C (89°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec393742475458636458484338
Data source: Temperature data for Black Diamond 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 Black Diamond

In Black Diamond in September, the precipitation amount is 105 mm (4.1 in) over the course of 12 days.

September Precipitation Trends in Black Diamond

The chart displays monthly precipitation patterns in Black Diamond, 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 Black Diamond, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 12 days.
JanFebMarAprMayJunJulAugSepOctNovDec20624616014284752121105197223244
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Black Diamond

In Black Diamond in September humidity is 62%. With an average temperature of 15°C (59°F), this humidity feels like a refreshing embrace, making it ideal for leisurely strolls and explorations without feeling overly hot or sticky.

September Average Humidity in Black Diamond

This chart illustrates the average monthly humidity levels in Black Diamond, 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 Black Diamond is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%87%84%81%82%79%63%62%83%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Black Diamond

In Black Diamond in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Black Diamond.

Maximum UV Index Levels in Black Diamond for September

The chart shows the monthly maximum UV Index (UVI) for Black Diamond 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 Black Diamond typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec235699987532
Data source: Black Diamond 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 Black Diamond Compares to Other Months

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

This table compares monthly weather conditions in Black Diamond, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)206 mm (8.1 inches)86%low
February Weather3°C (37°F)246 mm (9.7 inches)86%moderate
March Weather5°C (42°F)160 mm (6.3 inches)87%moderate
April Weather8°C (47°F)142 mm (5.6 inches)84%high
May Weather12°C (54°F)84 mm (3.3 inches)81%very high
June Weather15°C (59°F)75 mm (2.9 inches)82%very high
July Weather17°C (64°F)21 mm (0.8 inches)79%very high
August Weather18°C (64°F)21 mm (0.8 inches)63%very high
September Weather15°C (59°F)105 mm (4.1 inches)62%high
October Weather9°C (48°F)197 mm (7.7 inches)83%moderate
November Weather6°C (43°F)223 mm (8.8 inches)89%moderate
December Weather4°C (39°F)244 mm (9.6 inches)88%low

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