September Weather in Barrett, United States

Last updated: June 24, 2025

In September, the average temperature in Barrett, United States reaches a warm 26°C (80°F). Expect a range between a cool 13°C (55°F) and a sizzling 38°C (100°F). This month typically sees about 217 mm (8.5 in) of precipitation spread over 14 days, alongside an average humidity of 73%.

September Temperature in Barrett

In September in Barrett, the average temperature is 26°C (80°F). Maximum can reach 38°C (100°F) and minimum can be as low as 13°C (55°F). This makes it a great time to explore Barrett, offering warm weather for outdoor activities while still being cool enough for comfortable sightseeing.

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

The chart illustrates September temperature patterns in Barrett, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Barrett, September typically has an average temperature of 26°C (80°F), with highs reaching up to 38°C (100°F) and lows dropping to around 13°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec545765697681838380726257
Data source: Temperature data for Barrett 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 Barrett

In Barrett in September, the precipitation amount is 217 mm (8.5 in) over a span of 14 days.

September Precipitation Trends in Barrett

The chart displays monthly precipitation patterns in Barrett, 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 Barrett, September typically receives around 217 mm (8.5 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec9310210010618817114220821711679117
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Barrett

In Barrett in September, humidity is 73%. With an average temperature of 26°C (80°F), this humidity feels like a warm embrace that clings to your skin, making outdoor exploration a bit sticky but still inviting, perfect for leisurely strolls in the shade or refreshing breaks by the water.

September Average Humidity in Barrett

This chart illustrates the average monthly humidity levels in Barrett, 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 Barrett is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%81%76%79%79%74%72%68%73%75%78%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Barrett

In Barrett 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 Barrett.

Maximum UV Index Levels in Barrett for September

The chart shows the monthly maximum UV Index (UVI) for Barrett 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 Barrett typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111111111110965
Data source: Barrett 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 Barrett Compares to Other Months

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

This table compares monthly weather conditions in Barrett, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (54°F)93 mm (3.7 inches)78%moderate
February Weather14°C (58°F)102 mm (4.0 inches)81%very high
March Weather18°C (65°F)100 mm (3.9 inches)76%very high
April Weather21°C (69°F)106 mm (4.2 inches)79%extreme
May Weather25°C (77°F)188 mm (7.4 inches)79%extreme
June Weather27°C (81°F)171 mm (6.7 inches)74%extreme
July Weather28°C (83°F)142 mm (5.6 inches)71%extreme
August Weather28°C (83°F)208 mm (8.2 inches)68%extreme
September Weather26°C (80°F)217 mm (8.5 inches)73%very high
October Weather22°C (72°F)116 mm (4.6 inches)75%very high
November Weather16°C (62°F)79 mm (3.1 inches)78%high
December Weather14°C (58°F)117 mm (4.6 inches)84%moderate

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