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September Weather in Brunswick, United States

Last updated: June 24, 2025

In September, the average temperature in Brunswick, United States hovers around 26°C (79°F), with a comfortable minimum of 17°C (63°F) and a warm maximum of 35°C (96°F). Expect some rain, with a total precipitation of 149 mm (5.9 in) spread across 15 days, resulting in an average humidity of 83%. This combination creates a tropical atmosphere perfect for exploration! 🌧️🌞

September Temperature in Brunswick

In September in Brunswick, the average temperature is 26°C (79°F). Maximum temperatures can reach 35°C (96°F), while the minimum can dip as low as 17°C (63°F). This pleasant climate makes it an ideal time for outdoor activities and exploration in Brunswick.

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

The chart illustrates September temperature patterns in Brunswick, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brunswick, September typically has an average temperature of 26°C (79°F), with highs reaching up to 35°C (96°F) and lows dropping to around 17°C (63°F).
JanFebMarAprMayJunJulAugSepOctNovDec545963687579818179746257
Data source: Temperature data for Brunswick 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 Brunswick

In Brunswick in September, the precipitation amount is 149 mm (5.9 in) over a period of 15 days.

September Precipitation Trends in Brunswick

The chart displays monthly precipitation patterns in Brunswick, 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 Brunswick, September typically receives around 149 mm (5.9 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec54785879801391551591497686110
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Brunswick

In Brunswick in September, humidity is 83%. With an average temperature of 26°C (79°F), this humidity feels like a heavy blanket enveloping you, making travel an exercise in endurance as the air clings to your skin and saps your energy.

September Average Humidity in Brunswick

This chart illustrates the average monthly humidity levels in Brunswick, 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 Brunswick is approximately 83%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%79%78%73%72%74%82%82%83%79%82%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brunswick

In Brunswick 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 Brunswick.

Maximum UV Index Levels in Brunswick for September

The chart shows the monthly maximum UV Index (UVI) for Brunswick 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 Brunswick typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec579101111111110864
Data source: Brunswick 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 Brunswick Compares to Other Months

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

This table compares monthly weather conditions in Brunswick, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather12°C (55°F)54 mm (2.1 inches)84%moderate
February Weather15°C (59°F)78 mm (3.1 inches)79%high
March Weather17°C (63°F)58 mm (2.3 inches)78%very high
April Weather20°C (68°F)79 mm (3.1 inches)72%very high
May Weather24°C (75°F)80 mm (3.1 inches)72%extreme
June Weather26°C (79°F)139 mm (5.5 inches)74%extreme
July Weather27°C (82°F)155 mm (6.1 inches)82%extreme
August Weather27°C (81°F)159 mm (6.3 inches)82%extreme
September Weather26°C (79°F)149 mm (5.9 inches)83%very high
October Weather23°C (74°F)76 mm (3.0 inches)79%very high
November Weather17°C (62°F)86 mm (3.4 inches)82%high
December Weather14°C (57°F)110 mm (4.3 inches)85%moderate

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