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September Weather in Saybrook, United States

Last updated: June 24, 2025

In Saybrook, United States, the average temperature in September typically hovers around 21°C (70°F). Expect a range from a cool 5°C (41°F) to a warm 34°C (94°F). During this time, precipitation averages 67 mm (2.7 in) over about 7 days, paired with an humidity level of 80%. Be prepared for a mix of conditions, making it essential to plan accordingly!

September Temperature in Saybrook

In September in Saybrook, the average temperature is 21°C (70°F). Maximums can reach 34°C (94°F), while minimums can drop as low as 5°C (41°F). This range makes it an ideal time for travelers to enjoy a variety of outdoor activities, while also being prepared for potential temperature fluctuations.

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

The chart illustrates September temperature patterns in Saybrook, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Saybrook, September typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (41°F).
JanFebMarAprMayJunJulAugSepOctNovDec273042516474777470564135
Data source: Temperature data for Saybrook 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 Saybrook

In Saybrook in September, the precipitation amount is 67 mm (2.7 in) over a span of 7 days.

September Precipitation Trends in Saybrook

The chart displays monthly precipitation patterns in Saybrook, 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 Saybrook, September typically receives around 67 mm (2.7 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec67711131161511108799671236554
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Saybrook

In Saybrook in September humidity is 80%. With an average temperature of 21°C (70°F), this humidity feels like a warm, enveloping blanket that can make even short walks feel draining, urging travelers to seek shade or a cool drink frequently.

September Average Humidity in Saybrook

This chart illustrates the average monthly humidity levels in Saybrook, 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 Saybrook is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Saybrook

In Saybrook 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 Saybrook.

Maximum UV Index Levels in Saybrook for September

The chart shows the monthly maximum UV Index (UVI) for Saybrook 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 Saybrook typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111098642
Data source: Saybrook 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 Saybrook Compares to Other Months

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

This table compares monthly weather conditions in Saybrook, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-3°C (28°F)67 mm (2.6 inches)82%moderate
February Weather-1°C (30°F)71 mm (2.8 inches)83%moderate
March Weather5°C (42°F)112 mm (4.4 inches)84%high
April Weather11°C (51°F)116 mm (4.6 inches)85%very high
May Weather18°C (64°F)151 mm (5.9 inches)79%very high
June Weather23°C (74°F)110 mm (4.3 inches)82%extreme
July Weather25°C (77°F)87 mm (3.4 inches)80%very high
August Weather23°C (74°F)99 mm (3.9 inches)81%very high
September Weather21°C (70°F)67 mm (2.7 inches)80%very high
October Weather14°C (57°F)123 mm (4.8 inches)82%high
November Weather5°C (41°F)65 mm (2.6 inches)88%moderate
December Weather1°C (35°F)54 mm (2.1 inches)84%low

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