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September Weather in Brewster, United States

Last updated: June 24, 2025

In Brewster, United States, the average temperature in September hovers around 19°C (66°F). Expect a range from a chilly 3°C (37°F) at its lowest to a warm 36°C (96°F) at its peak. During this month, anticipate 68 mm (2.7 in) of precipitation spread over 6 days, contributing to an average humidity level of 77%.

September Temperature in Brewster

In September in Brewster, the average temperature is 19°C (66°F). Maximums can reach 36°C (96°F), while minimums can drop to as low as 3°C (37°F). Be prepared for a wide range of temperatures and pack accordingly for your trip!

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

The chart illustrates September temperature patterns in Brewster, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Brewster, September typically has an average temperature of 19°C (66°F), with highs reaching up to 36°C (96°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec252337465872767266483829
Data source: Temperature data for Brewster 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 Brewster

In Brewster in September, the precipitation amount is 68 mm (2.7 in) spread over the course of 6 days.

September Precipitation Trends in Brewster

The chart displays monthly precipitation patterns in Brewster, 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 Brewster, September typically receives around 68 mm (2.7 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec1923674911491839068542636
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Brewster

In Brewster in September, humidity is 77%. With an average temperature of 19°C (66°F), this humidity feels like a heavy blanket wrapping around you, making the air feel thick and sticky, which can be quite uncomfortable for traveling.

September Average Humidity in Brewster

This chart illustrates the average monthly humidity levels in Brewster, 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 Brewster is approximately 77%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%81%69%71%80%83%84%84%77%72%80%79%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Brewster

In Brewster in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in Brewster.

Maximum UV Index Levels in Brewster for September

The chart shows the monthly maximum UV Index (UVI) for Brewster 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 Brewster typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3569101110108643
Data source: Brewster 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 Brewster Compares to Other Months

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

This table compares monthly weather conditions in Brewster, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (25°F)19 mm (0.8 inches)73%moderate
February Weather-5°C (24°F)23 mm (0.9 inches)81%moderate
March Weather3°C (38°F)67 mm (2.6 inches)69%high
April Weather8°C (46°F)49 mm (1.9 inches)71%very high
May Weather14°C (58°F)114 mm (4.5 inches)80%very high
June Weather22°C (72°F)91 mm (3.6 inches)83%extreme
July Weather24°C (76°F)83 mm (3.3 inches)84%very high
August Weather22°C (73°F)90 mm (3.5 inches)84%very high
September Weather19°C (66°F)68 mm (2.7 inches)77%very high
October Weather9°C (48°F)54 mm (2.1 inches)72%high
November Weather3°C (38°F)26 mm (1.0 inches)80%moderate
December Weather-2°C (29°F)36 mm (1.4 inches)79%moderate

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