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September Weather in Brighton, United States

Last updated: June 24, 2025

In September, the average temperature in Brighton, United States is a pleasant 24°C (76°F), with minimums dipping to 10°C (51°F) and maximums soaring to 35°C (96°F). Visitors can expect around 92 mm (3.6 in) of precipitation over approximately 8 days, while the average humidity hovers around 70%.

September Temperature in Brighton

In September in Brighton, the average temperature is 24°C (76°F), with maximums reaching 35°C (96°F) and minimums dropping as low as 10°C (51°F). Therefore, it's advisable to pack layers for your travels, ensuring comfort in both warmer afternoons and cooler evenings.

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

The chart illustrates September temperature patterns in Brighton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brighton, September typically has an average temperature of 24°C (76°F), with highs reaching up to 35°C (96°F) and lows dropping to around 10°C (51°F).
JanFebMarAprMayJunJulAugSepOctNovDec414554617278827975645046
Data source: Temperature data for Brighton 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 Brighton

In Brighton in September, the precipitation amount is 92 mm (3.6 in), occurring over the course of 8 days.

September Precipitation Trends in Brighton

The chart displays monthly precipitation patterns in Brighton, 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 Brighton, September typically receives around 92 mm (3.6 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1051721701331151091161119211980145
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Brighton

In Brighton 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 Brighton

This chart illustrates the average monthly humidity levels in Brighton, 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 Brighton 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 Brighton

In Brighton 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 Brighton.

Maximum UV Index Levels in Brighton for September

The chart shows the monthly maximum UV Index (UVI) for Brighton 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 Brighton typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec36710101111109753
Data source: Brighton 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 Brighton Compares to Other Months

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

This table compares monthly weather conditions in Brighton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)105 mm (4.1 inches)86%moderate
February Weather7°C (45°F)172 mm (6.8 inches)85%high
March Weather12°C (55°F)170 mm (6.7 inches)84%high
April Weather16°C (61°F)133 mm (5.2 inches)81%very high
May Weather22°C (72°F)115 mm (4.5 inches)83%very high
June Weather26°C (79°F)109 mm (4.3 inches)83%extreme
July Weather28°C (82°F)116 mm (4.6 inches)80%extreme
August Weather26°C (80°F)111 mm (4.4 inches)73%very high
September Weather24°C (76°F)92 mm (3.6 inches)70%very high
October Weather18°C (64°F)119 mm (4.7 inches)73%high
November Weather10°C (50°F)80 mm (3.2 inches)85%moderate
December Weather8°C (46°F)145 mm (5.7 inches)88%moderate

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