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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 21°C (70°F), with a minimum dipping to 7°C (46°F) and a maximum soaring to 34°C (93°F). You'll experience about 100 mm (3.9 in) of precipitation over 10 days, contributing to an average humidity of 68%. 🌦️

September Temperature in Westfield

In September in Westfield, the average temperature is 21°C (70°F), with maximums reaching up to 34°C (93°F) and minimums dropping as low as 7°C (46°F). This range makes it a great time to explore outdoor activities while being prepared for both warm days and cooler evenings.

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 21°C (70°F), with highs reaching up to 34°C (93°F) and lows dropping to around 7°C (46°F).
JanFebMarAprMayJunJulAugSepOctNovDec333641526271777569594537
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 precipitation amount is 100 mm (3.9 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 100 mm (3.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec691031001161239714612910013484108
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 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 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 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 Westfield

In Westfield 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
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 Weather1°C (33°F)69 mm (2.7 inches)84%moderate
February Weather2°C (36°F)103 mm (4.1 inches)82%moderate
March Weather5°C (42°F)100 mm (3.9 inches)81%high
April Weather11°C (52°F)116 mm (4.6 inches)78%very high
May Weather17°C (62°F)123 mm (4.8 inches)69%very high
June Weather22°C (72°F)97 mm (3.8 inches)69%very high
July Weather25°C (78°F)146 mm (5.7 inches)62%very high
August Weather24°C (76°F)129 mm (5.1 inches)65%very high
September Weather21°C (70°F)100 mm (3.9 inches)68%very high
October Weather15°C (60°F)134 mm (5.3 inches)74%high
November Weather7°C (45°F)84 mm (3.3 inches)82%moderate
December Weather3°C (38°F)108 mm (4.3 inches)80%low

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