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September Weather in Mastic, United States

Last updated: June 24, 2025

In September, the average temperature in Mastic, United States is 21°C (70°F), offering a pleasant climate for outdoor activities. Expect minimums around 12°C (54°F) and highs reaching up to 29°C (84°F). However, be prepared for some rain, as the area experiences an average precipitation of 87 mm (3.4 in) over 9 days. With an average humidity of 68%, the atmosphere is both comfortable and refreshing.

September Temperature in Mastic

In September in Mastic, the average temperature is 21°C (70°F). Maximums can reach 29°C (84°F), while minimums can drop as low as 12°C (54°F). This pleasant climate makes it an ideal time for outdoor activities and exploration.

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

The chart illustrates September temperature patterns in Mastic, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Mastic, September typically has an average temperature of 21°C (70°F), with highs reaching up to 29°C (84°F) and lows dropping to around 12°C (54°F).
JanFebMarAprMayJunJulAugSepOctNovDec373841485767757569615042
Data source: Temperature data for Mastic 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 Mastic

In Mastic in September, the precipitation amount is 87 mm (3.4 in), occurring over a span of 9 days.

September Precipitation Trends in Mastic

The chart displays monthly precipitation patterns in Mastic, 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 Mastic, September typically receives around 87 mm (3.4 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec81107106122117681009887139102134
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Mastic

In Mastic in September humidity is 68%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making the air feel slightly heavy and sticky, which can be quite exhausting for travelers.

September Average Humidity in Mastic

This chart illustrates the average monthly humidity levels in Mastic, 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 Mastic 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 Mastic

In Mastic 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 Mastic.

Maximum UV Index Levels in Mastic for September

The chart shows the monthly maximum UV Index (UVI) for Mastic 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 Mastic typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: Mastic 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 Mastic Compares to Other Months

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

This table compares monthly weather conditions in Mastic, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather3°C (37°F)81 mm (3.2 inches)84%moderate
February Weather3°C (38°F)107 mm (4.2 inches)82%moderate
March Weather5°C (41°F)106 mm (4.2 inches)81%high
April Weather9°C (48°F)122 mm (4.8 inches)78%very high
May Weather14°C (57°F)117 mm (4.6 inches)69%very high
June Weather19°C (67°F)68 mm (2.7 inches)69%very high
July Weather24°C (75°F)100 mm (3.9 inches)62%very high
August Weather24°C (75°F)98 mm (3.8 inches)65%very high
September Weather21°C (70°F)87 mm (3.4 inches)68%very high
October Weather16°C (62°F)139 mm (5.5 inches)74%high
November Weather10°C (50°F)102 mm (4.0 inches)82%moderate
December Weather5°C (42°F)134 mm (5.3 inches)80%low

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