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September Weather in Holyoke, United States

Last updated: June 24, 2025

In September, the average temperature in Holyoke, United States hovers around 20°C (69°F), though it can fluctuate from a chilly 1°C (34°F) to a sweltering 40°C (103°F). During this month, expect about 32 mm (1.3 in) of precipitation spread over 5 days, while average humidity levels sit at a comfortable 70%. Prepare for a month of diverse weather!

September Temperature in Holyoke

In September in Holyoke, the average temperature is 20°C (69°F). The maximum can reach 40°C (103°F), and the minimum can be as low as 1°C (34°F). This makes it an ideal time for travelers to enjoy a mix of warm days and cooler nights, so pack accordingly!

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

The chart illustrates September temperature patterns in Holyoke, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Holyoke, September typically has an average temperature of 20°C (69°F), with highs reaching up to 40°C (103°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec323043495973777469504335
Data source: Temperature data for Holyoke 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 Holyoke

In Holyoke in September, the precipitation amount is 32 mm (1.3 in) over the course of 5 days.

September Precipitation Trends in Holyoke

The chart displays monthly precipitation patterns in Holyoke, 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 Holyoke, September typically receives around 32 mm (1.3 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec1316625411542594732351515
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Holyoke

In Holyoke in September humidity is 70%. With an average temperature of 20°C (69°F), this humidity feels like a warm blanket wrapped around you, making outdoor activities a bit challenging but also an opportunity to enjoy refreshing drinks and shaded spots while exploring the vibrant surroundings.

September Average Humidity in Holyoke

This chart illustrates the average monthly humidity levels in Holyoke, 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 Holyoke is approximately 70%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec73%80%64%64%76%79%77%79%70%64%75%78%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Holyoke

In Holyoke in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Holyoke.

Maximum UV Index Levels in Holyoke for September

The chart shows the monthly maximum UV Index (UVI) for Holyoke 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 Holyoke typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101211109643
Data source: Holyoke 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 Holyoke Compares to Other Months

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

This table compares monthly weather conditions in Holyoke, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (32°F)13 mm (0.5 inches)73%moderate
February Weather-1°C (30°F)16 mm (0.6 inches)80%moderate
March Weather6°C (43°F)61 mm (2.4 inches)64%high
April Weather10°C (50°F)54 mm (2.1 inches)64%very high
May Weather15°C (59°F)115 mm (4.5 inches)76%very high
June Weather23°C (73°F)42 mm (1.6 inches)79%extreme
July Weather25°C (77°F)59 mm (2.3 inches)77%extreme
August Weather23°C (74°F)47 mm (1.8 inches)79%very high
September Weather20°C (69°F)32 mm (1.3 inches)70%very high
October Weather10°C (51°F)35 mm (1.4 inches)64%high
November Weather6°C (43°F)15 mm (0.6 inches)75%moderate
December Weather2°C (35°F)15 mm (0.6 inches)78%moderate

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