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September Weather in Brunswick, United States

Last updated: June 24, 2025

In Brunswick, United States, the average temperature in September hovers around 22°C (72°F), making it a pleasant destination. However, be prepared for fluctuations, with temperatures dipping to a minimum of 5°C (41°F) and soaring to a maximum of 34°C (94°F). During this month, expect around 78 mm (3.1 in) of precipitation spread over 6 days, complemented by an average humidity of 72%. Pack accordingly for a comfortable stay!

September Temperature in Brunswick

In September in Brunswick, the average temperature is 22°C (72°F). The maximum can reach 34°C (94°F), and the minimum can be as low as 5°C (41°F). This makes it an ideal time for travelers to experience a range of weather conditions, so packing accordingly is essential.

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 22°C (72°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec303245546676797671574337
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 78 mm (3.1 in) spread over 6 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 78 mm (3.1 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec62511159222014311499781214937
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Brunswick

In Brunswick in September humidity is 72%. With an average temperature of 22°C (72°F), this humidity feels like you are stepping into a warm, embracing blanket, making traveling feel sweaty and slightly stifling, but the balmy weather is also quite perfect for exploring local attractions.

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 72%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec80%78%75%77%82%83%81%78%72%72%84%86%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101111109643
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 Weather-1°C (30°F)62 mm (2.4 inches)80%moderate
February Weather0°C (32°F)51 mm (2.0 inches)78%moderate
March Weather7°C (46°F)115 mm (4.5 inches)75%high
April Weather12°C (54°F)92 mm (3.6 inches)77%very high
May Weather19°C (66°F)220 mm (8.6 inches)82%very high
June Weather25°C (76°F)143 mm (5.6 inches)83%extreme
July Weather26°C (80°F)114 mm (4.5 inches)81%extreme
August Weather24°C (76°F)99 mm (3.9 inches)78%very high
September Weather22°C (72°F)78 mm (3.1 inches)72%very high
October Weather14°C (57°F)121 mm (4.7 inches)72%high
November Weather6°C (44°F)49 mm (1.9 inches)84%moderate
December Weather3°C (37°F)37 mm (1.4 inches)86%moderate

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