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September Weather in Mattituck, United States

Last updated: June 24, 2025

In September, the average temperature in Mattituck, United States is a pleasant 20°C (69°F). Expect a minimum of 12°C (55°F) and a maximum of 27°C (81°F). With an average humidity of 68%, it's a comfortable time to explore. However, be prepared for some rain, as 97 mm (3.8 in) of precipitation can be expected over about 10 days. Enjoy the mild weather!

September Temperature in Mattituck

In September in Mattituck, the average temperature is 20°C (69°F), with a maximum that can reach 27°C (81°F) and a minimum that can drop to 12°C (55°F). This mild climate makes it an ideal time for travelers to explore and enjoy outdoor activities.

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

The chart illustrates September temperature patterns in Mattituck, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mattituck, September typically has an average temperature of 20°C (69°F), with highs reaching up to 27°C (81°F) and lows dropping to around 12°C (55°F).
JanFebMarAprMayJunJulAugSepOctNovDec363639465565737469615041
Data source: Temperature data for Mattituck 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 Mattituck

In Mattituck in September, the total precipitation amount is 97 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in Mattituck

The chart displays monthly precipitation patterns in Mattituck, 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 Mattituck, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec901271121391307210510097159111152
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mattituck

In Mattituck in September, humidity is 68%. With an average temperature of 20°C (69°F), this humidity feels like a warm embrace, making outdoor exploration both refreshing and slightly sticky, requiring occasional breaks in the shade to stay comfortable while traveling.

September Average Humidity in Mattituck

This chart illustrates the average monthly humidity levels in Mattituck, 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 Mattituck is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%81%78%70%69%62%65%68%74%82%80%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Mattituck

In Mattituck 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 Mattituck.

Maximum UV Index Levels in Mattituck for September

The chart shows the monthly maximum UV Index (UVI) for Mattituck 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 Mattituck typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec35689101098642
Data source: Mattituck 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 Mattituck Compares to Other Months

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

This table compares monthly weather conditions in Mattituck, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)90 mm (3.5 inches)84%moderate
February Weather2°C (37°F)127 mm (5.0 inches)82%moderate
March Weather4°C (39°F)112 mm (4.4 inches)81%high
April Weather8°C (47°F)139 mm (5.5 inches)78%very high
May Weather13°C (55°F)130 mm (5.1 inches)69%very high
June Weather18°C (65°F)72 mm (2.8 inches)69%very high
July Weather23°C (73°F)105 mm (4.1 inches)62%very high
August Weather23°C (74°F)100 mm (3.9 inches)65%very high
September Weather20°C (69°F)97 mm (3.8 inches)68%very high
October Weather16°C (62°F)159 mm (6.2 inches)74%high
November Weather10°C (50°F)111 mm (4.4 inches)82%moderate
December Weather5°C (42°F)152 mm (6.0 inches)80%low

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