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September Weather in Westfield, United States

Last updated: June 24, 2025

In September, the average temperature in Westfield, United States hovers around 17°C (64°F), with minimums dipping to 1°C (34°F) and maximums reaching up to 33°C (92°F). Expect around 95 mm (3.7 in) of precipitation spread over 10 days, and enjoy a relatively high average humidity of 79%, making it a unique time to experience the local climate.

September Temperature in Westfield

In September in Westfield, the average temperature is 17°C (64°F). Maximum temperatures can reach 33°C (92°F) while minimums can drop as low as 1°C (34°F). Be prepared for a wide range of temperatures during your travels, making it essential to pack accordingly.

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

The chart illustrates September temperature patterns in Westfield, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Westfield, September typically has an average temperature of 17°C (64°F), with highs reaching up to 33°C (92°F) and lows dropping to around 1°C (34°F).
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Data source: Temperature data for Westfield 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 Westfield

In Westfield in September, the total precipitation amount is 95 mm (3.7 in) over the course of 10 days.

September Precipitation Trends in Westfield

The chart displays monthly precipitation patterns in Westfield, 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 Westfield, September typically receives around 95 mm (3.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec42536396114111117116951024948
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Westfield

In Westfield in September humidity is 79%. With an average temperature of 17°C (64°F), this humidity feels like a warm blanket wrapped around you, making outdoor activities feel a bit muggy and requiring frequent hydration as you explore the sights.

September Average Humidity in Westfield

This chart illustrates the average monthly humidity levels in Westfield, 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 Westfield is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Westfield

In Westfield in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Westfield.

Maximum UV Index Levels in Westfield for September

The chart shows the monthly maximum UV Index (UVI) for Westfield 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 Westfield typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec24589101097532
Data source: Westfield 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 Westfield Compares to Other Months

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

This table compares monthly weather conditions in Westfield, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-7°C (20°F)42 mm (1.6 inches)85%low
February Weather-7°C (20°F)53 mm (2.1 inches)85%moderate
March Weather1°C (34°F)63 mm (2.5 inches)85%moderate
April Weather7°C (44°F)96 mm (3.8 inches)85%very high
May Weather15°C (59°F)114 mm (4.5 inches)78%very high
June Weather21°C (70°F)111 mm (4.4 inches)80%very high
July Weather23°C (74°F)117 mm (4.6 inches)78%very high
August Weather21°C (70°F)115 mm (4.5 inches)76%very high
September Weather17°C (64°F)95 mm (3.7 inches)79%high
October Weather10°C (50°F)102 mm (4.0 inches)83%moderate
November Weather2°C (35°F)49 mm (1.9 inches)88%moderate
December Weather-3°C (27°F)48 mm (1.9 inches)81%low

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