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September Weather in Islip Terrace, United States

Last updated: June 24, 2025

In September, the average temperature in Islip Terrace, United States is a pleasant 21°C (70°F). However, prepare for some variability, as temperatures can dip to a minimum of 12°C (53°F) and reach a maximum of 29°C (85°F). The month sees an average precipitation of 96 mm (3.8 in) spread over 10 days, while the humidity hovers at a comfortable 68%.

September Temperature in Islip Terrace

In September in Islip Terrace, the average temperature is 21°C (70°F). Maximums can reach 29°C (85°F), while minimums can drop to as low as 12°C (53°F). This mild climate makes Islip Terrace an ideal destination for travelers seeking pleasant weather and comfortable conditions for outdoor activities.

September Weather in Islip Terrace: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Islip Terrace, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Islip Terrace, September typically has an average temperature of 21°C (70°F), with highs reaching up to 29°C (85°F) and lows dropping to around 12°C (53°F).
JanFebMarAprMayJunJulAugSepOctNovDec363740485768757570614941
Data source: Temperature data for Islip Terrace 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 Islip Terrace

In Islip Terrace in September, the total precipitation amount is 96 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in Islip Terrace

The chart displays monthly precipitation patterns in Islip Terrace, 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 Islip Terrace, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec831181071301238613010996142105138
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Islip Terrace

In Islip Terrace 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 Islip Terrace

This chart illustrates the average monthly humidity levels in Islip Terrace, 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 Islip Terrace 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 Islip Terrace

In Islip Terrace 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 Islip Terrace.

Maximum UV Index Levels in Islip Terrace for September

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

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

This table compares monthly weather conditions in Islip Terrace, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather2°C (36°F)82 mm (3.2 inches)84%moderate
February Weather3°C (37°F)118 mm (4.6 inches)82%moderate
March Weather5°C (41°F)107 mm (4.2 inches)81%high
April Weather9°C (49°F)130 mm (5.1 inches)78%very high
May Weather14°C (58°F)123 mm (4.9 inches)69%very high
June Weather20°C (68°F)86 mm (3.4 inches)69%very high
July Weather24°C (76°F)130 mm (5.1 inches)62%very high
August Weather24°C (75°F)109 mm (4.3 inches)65%very high
September Weather21°C (70°F)96 mm (3.8 inches)68%very high
October Weather16°C (61°F)142 mm (5.6 inches)74%high
November Weather9°C (49°F)105 mm (4.1 inches)82%moderate
December Weather5°C (41°F)138 mm (5.4 inches)80%low

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