September Weather in Fairhaven, United States

Last updated: June 24, 2025

In Fairhaven, United States, the average temperature in September typically hovers around 19°C (67°F). Visitors can expect a minimum of 7°C (45°F) and a maximum of 32°C (90°F), creating a diverse range of weather experiences. During this month, the area encounters approximately 98 mm (3.8 in) of precipitation over 10 days, alongside an average humidity level of 75%. Whether you're planning outdoor activities or cozy indoor retreats, there's something for everyone in this intriguing climate!

September Temperature in Fairhaven

In September in Fairhaven, the average temperature is 19°C (67°F), with maximums reaching 32°C (90°F) and minimums dropping as low as 7°C (45°F). This varied climate makes it an ideal time for travelers to enjoy both warm days and cool evenings.

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

The chart illustrates September temperature patterns in Fairhaven, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Fairhaven, September typically has an average temperature of 19°C (67°F), with highs reaching up to 32°C (90°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec333539485868747367574536
Data source: Temperature data for Fairhaven 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 Fairhaven

In Fairhaven in September, the precipitation amount is 98 mm (3.8 in) spread over a period of 10 days.

September Precipitation Trends in Fairhaven

The chart displays monthly precipitation patterns in Fairhaven, 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 Fairhaven, September typically receives around 98 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec78941041229994113869813896116
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Fairhaven

In Fairhaven in September humidity is 75%. With an average temperature of 19°C (67°F), this humidity feels like a warm embrace, making travel invigorating yet slightly sticky, as you navigate through the vibrant streets or scenic landscapes.

September Average Humidity in Fairhaven

This chart illustrates the average monthly humidity levels in Fairhaven, 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 Fairhaven is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%84%82%79%75%78%76%76%76%75%80%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Fairhaven

In Fairhaven 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 Fairhaven.

Maximum UV Index Levels in Fairhaven for September

The chart shows the monthly maximum UV Index (UVI) for Fairhaven 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 Fairhaven typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3568910998642
Data source: Fairhaven 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 Fairhaven Compares to Other Months

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

This table compares monthly weather conditions in Fairhaven, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (33°F)78 mm (3.1 inches)84%moderate
February Weather2°C (35°F)94 mm (3.7 inches)84%moderate
March Weather4°C (39°F)104 mm (4.1 inches)82%high
April Weather9°C (49°F)122 mm (4.8 inches)79%very high
May Weather14°C (58°F)99 mm (3.9 inches)75%very high
June Weather20°C (68°F)94 mm (3.7 inches)78%very high
July Weather23°C (74°F)113 mm (4.5 inches)76%very high
August Weather23°C (74°F)86 mm (3.4 inches)76%very high
September Weather19°C (67°F)98 mm (3.8 inches)75%very high
October Weather14°C (58°F)138 mm (5.4 inches)75%high
November Weather7°C (45°F)96 mm (3.8 inches)80%moderate
December Weather2°C (37°F)116 mm (4.6 inches)80%low

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