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September Weather in Westfield, United States

Last updated: June 24, 2025

In September, the average temperature in Westfield, United States is a pleasant 14°C (57°F). However, be prepared for variability, as temperatures can dip as low as -2°C (28°F) and soar up to 30°C (87°F). Expect 97 mm (3.8 in) of precipitation over approximately 10 days, contributing to an average humidity of 85%. Whether you're enjoying a warm day or bracing for a cooler spell, the weather is sure to keep you on your toes!

September Temperature in Westfield

In September in Westfield, the average temperature is 14°C (57°F). Maximums can reach 30°C (87°F), and minimums can be as low as -2°C (28°F). It's advisable to pack layers for your travels, as the weather can vary significantly throughout the day.

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 14°C (57°F), with highs reaching up to 30°C (87°F) and lows dropping to around -2°C (28°F).
JanFebMarAprMayJunJulAugSepOctNovDec151725385161676557463220
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 97 mm (3.8 in) over a span 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 97 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec937976111108911179097112114103
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 85%. With an average temperature of 14°C (57°F), this humidity feels like a thick blanket enveloping you, making travel feel heavy and sluggish.

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 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec93%92%90%87%82%77%82%83%85%87%88%90%
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.
JanFebMarAprMayJunJulAugSepOctNovDec2357810887532
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-9°C (16°F)93 mm (3.7 inches)93%low
February Weather-8°C (18°F)79 mm (3.1 inches)92%moderate
March Weather-4°C (26°F)76 mm (3.0 inches)90%moderate
April Weather3°C (39°F)111 mm (4.4 inches)87%high
May Weather11°C (52°F)108 mm (4.2 inches)82%very high
June Weather16°C (61°F)91 mm (3.6 inches)77%very high
July Weather19°C (67°F)117 mm (4.6 inches)81%very high
August Weather19°C (66°F)90 mm (3.5 inches)83%very high
September Weather14°C (57°F)97 mm (3.8 inches)85%high
October Weather8°C (46°F)112 mm (4.4 inches)87%moderate
November Weather0°C (32°F)113 mm (4.5 inches)87%moderate
December Weather-7°C (20°F)103 mm (4.1 inches)90%low

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