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September Weather in Wallkill, United States

Last updated: June 24, 2025

In Wallkill, United States, the average temperature in September hovers around 19°C (66°F), offering a mild climate for visitors. Expect the temperature to range from a brisk 3°C (38°F) to a warm 33°C (91°F). During this month, you might experience 108 mm (4.3 in) of precipitation spread across about 9 days, with an average humidity level of 68%. Whether you’re planning indoor activities or embracing the rain, this month has something for everyone!

September Temperature in Wallkill

In September in Wallkill, the average temperature is 19°C (66°F). Maximum temperatures can reach 33°C (91°F), while minimums can drop as low as 3°C (38°F). This climate makes Wallkill an ideal destination for travelers seeking a mix of warm and cool experiences.

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

The chart illustrates September temperature patterns in Wallkill, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Wallkill, September typically has an average temperature of 19°C (66°F), with highs reaching up to 33°C (91°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec303338496069757366564234
Data source: Temperature data for Wallkill 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 Wallkill

In Wallkill in September, the precipitation amount is 108 mm (4.3 in) spread over 9 days.

September Precipitation Trends in Wallkill

The chart displays monthly precipitation patterns in Wallkill, 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 Wallkill, September typically receives around 108 mm (4.3 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec7096891191229412312210814289101
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Wallkill

In Wallkill in September humidity is 68%. With an average temperature of 19°C (66°F), this humidity feels like a warm embrace, creating a sticky atmosphere that can be a bit uncomfortable for traveling.

September Average Humidity in Wallkill

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

In Wallkill 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 Wallkill.

Maximum UV Index Levels in Wallkill for September

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

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

This table compares monthly weather conditions in Wallkill, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-1°C (30°F)70 mm (2.8 inches)84%moderate
February Weather0°C (33°F)96 mm (3.8 inches)82%moderate
March Weather4°C (39°F)89 mm (3.5 inches)81%high
April Weather10°C (50°F)118 mm (4.7 inches)78%very high
May Weather15°C (60°F)121 mm (4.8 inches)69%very high
June Weather20°C (69°F)94 mm (3.7 inches)69%very high
July Weather24°C (75°F)123 mm (4.9 inches)62%very high
August Weather23°C (73°F)122 mm (4.8 inches)65%very high
September Weather19°C (66°F)108 mm (4.3 inches)68%very high
October Weather13°C (56°F)142 mm (5.6 inches)74%high
November Weather5°C (42°F)89 mm (3.5 inches)82%moderate
December Weather1°C (34°F)101 mm (4.0 inches)80%low

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