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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 is a warm 27°C (81°F). Daily temperatures can vary, with a minimum of 18°C (65°F) and a maximum of 37°C (98°F). Expect 149 mm (5.8 in) of rainfall spread over 16 days, contributing to an average humidity level of 83%. Prepare for a tropical experience filled with warmth and a touch of moisture!

September Temperature in Black Diamond

In September in Black Diamond, the average temperature is 27°C (81°F). Maximums can reach 37°C (98°F) and minimums can be as low as 18°C (65°F). This makes it a great time to explore outdoor activities while being prepared for both warm days and cooler evenings.

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 27°C (81°F), with highs reaching up to 37°C (98°F) and lows dropping to around 18°C (65°F).
JanFebMarAprMayJunJulAugSepOctNovDec586467727781818281776661
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 149 mm (5.8 in) over the course of 16 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 149 mm (5.8 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec47602592109173217209149824786
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 83%. With an average temperature of 27°C (81°F), this humidity feels like a warm blanket enveloping you, making sightseeing and outdoor activities feel more exhausting and requiring frequent breaks to relax in the shade or cool off.

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 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec83%82%78%77%75%76%79%78%83%81%83%86%
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 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 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 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112111110975
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 Weather15°C (59°F)47 mm (1.9 inches)83%moderate
February Weather18°C (65°F)60 mm (2.4 inches)82%very high
March Weather19°C (67°F)25 mm (1.0 inches)78%very high
April Weather22°C (72°F)92 mm (3.6 inches)77%extreme
May Weather25°C (78°F)109 mm (4.3 inches)75%extreme
June Weather27°C (81°F)172 mm (6.8 inches)76%extreme
July Weather27°C (82°F)217 mm (8.5 inches)79%extreme
August Weather28°C (82°F)209 mm (8.2 inches)78%extreme
September Weather27°C (81°F)149 mm (5.8 inches)83%very high
October Weather25°C (77°F)82 mm (3.2 inches)81%very high
November Weather19°C (67°F)47 mm (1.8 inches)83%high
December Weather16°C (62°F)86 mm (3.4 inches)86%moderate

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