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September Weather in Blue Mountain, United States

Last updated: June 24, 2025

In Blue Mountain, United States, the average temperature in September hovers around 24°C (76°F), with minimums dipping to 10°C (50°F) and maximums peaking at 37°C (98°F). Expect a total precipitation of 123 mm (4.8 in) spread over 7 days, contributing to an average humidity of 70%. Embrace the warm, yet occasionally damp, climate as it sets the stage for a delightful month!

September Temperature in Blue Mountain

In September in Blue Mountain, the average temperature is 24°C (76°F). Maximum temperatures can reach as high as 37°C (98°F), while minimums can drop to as low as 10°C (50°F). Be prepared for a range of weather conditions and pack accordingly for your travels!

September Weather in Blue Mountain: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Blue Mountain, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Blue Mountain, September typically has an average temperature of 24°C (76°F), with highs reaching up to 37°C (98°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec434756617178817975655047
Data source: Temperature data for Blue Mountain 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 Blue Mountain

In Blue Mountain in September, the precipitation amount is 123 mm (4.8 in) over a span of 7 days.

September Precipitation Trends in Blue Mountain

The chart displays monthly precipitation patterns in Blue Mountain, 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 Blue Mountain, September typically receives around 123 mm (4.8 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec11418015714610912513311912310679153
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Blue Mountain

In Blue Mountain in September, humidity is 70%. With an average temperature of 24°C (76°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities feel a bit sticky and heavier, so travelers should stay hydrated and take regular breaks to enjoy the sights comfortably.

September Average Humidity in Blue Mountain

This chart illustrates the average monthly humidity levels in Blue Mountain, 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 Blue Mountain is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%84%81%83%83%80%74%70%73%85%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Blue Mountain

In Blue Mountain 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 Blue Mountain.

Maximum UV Index Levels in Blue Mountain for September

The chart shows the monthly maximum UV Index (UVI) for Blue Mountain 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 Blue Mountain typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109754
Data source: Blue Mountain 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 Blue Mountain Compares to Other Months

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

This table compares monthly weather conditions in Blue Mountain, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather6°C (43°F)113 mm (4.5 inches)86%moderate
February Weather8°C (47°F)180 mm (7.1 inches)85%high
March Weather13°C (56°F)157 mm (6.2 inches)84%very high
April Weather16°C (61°F)146 mm (5.7 inches)81%very high
May Weather22°C (72°F)109 mm (4.3 inches)83%extreme
June Weather25°C (78°F)125 mm (4.9 inches)83%extreme
July Weather27°C (81°F)133 mm (5.2 inches)80%extreme
August Weather26°C (80°F)119 mm (4.7 inches)73%very high
September Weather24°C (76°F)123 mm (4.8 inches)70%very high
October Weather18°C (65°F)106 mm (4.2 inches)73%high
November Weather10°C (51°F)79 mm (3.1 inches)85%moderate
December Weather8°C (48°F)153 mm (6.0 inches)88%moderate

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