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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 19°C (66°F). Expect a minimum of 7°C (45°F) and a comfortable maximum of 30°C (87°F). The weather brings about 77 mm (3.0 in) of precipitation spread over roughly 8 days, contributing to an average humidity of 76%. Embrace the mild climate!

September Temperature in Brighton

In September in Brighton, the average temperature is 19°C (66°F). Maximums can reach 30°C (87°F), while minimums can drop to as low as 7°C (45°F). This makes Brighton an ideal destination for travelers seeking comfortable weather and a pleasant getaway.

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 19°C (66°F), with highs reaching up to 30°C (87°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec283035435364727266554134
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 77 mm (3.0 in) distributed over 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 77 mm (3.0 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec909181117101741309077159107107
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 76%. With an average temperature of 19°C (66°F), this humidity feels like a warm, thick blanket wrapping around you, making travel mildly uncomfortable and encouraging frequent breaks in shaded or air-conditioned areas.

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 76%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%91%88%88%82%80%77%72%76%83%88%87%
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 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 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 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24581010997532
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 Weather-2°C (29°F)90 mm (3.6 inches)91%low
February Weather-1°C (30°F)91 mm (3.6 inches)91%moderate
March Weather2°C (35°F)81 mm (3.2 inches)88%moderate
April Weather6°C (44°F)117 mm (4.6 inches)88%very high
May Weather12°C (54°F)100 mm (4.0 inches)82%very high
June Weather18°C (64°F)74 mm (2.9 inches)79%very high
July Weather22°C (72°F)130 mm (5.1 inches)77%very high
August Weather22°C (72°F)90 mm (3.5 inches)72%very high
September Weather19°C (66°F)77 mm (3.0 inches)76%high
October Weather13°C (56°F)159 mm (6.3 inches)83%moderate
November Weather5°C (42°F)107 mm (4.2 inches)88%moderate
December Weather1°C (34°F)107 mm (4.2 inches)87%low

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