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September Weather in Bolton, United States

Last updated: June 24, 2025

In September, the average temperature in Bolton, United States is a pleasant 26°C (79°F). However, temperatures can fluctuate, with minimums of 10°C (50°F) and maximums soaring to 38°C (101°F). Expect some moisture in the air too, as precipitation averages around 93 mm (3.7 in) over 9 days. The average humidity hovers at a comfortable 73%, making it an ideal time for outdoor activities!

September Temperature in Bolton

In September in Bolton, the average temperature is 26°C (79°F), with maximums reaching as high as 38°C (101°F) and minimums dropping to as low as 10°C (50°F). Travelers should be prepared for warm days and cool nights during their visit.

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

The chart illustrates September temperature patterns in Bolton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bolton, September typically has an average temperature of 26°C (79°F), with highs reaching up to 38°C (101°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec485361647479828178695552
Data source: Temperature data for Bolton 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 Bolton

In Bolton in September, the precipitation amount is 93 mm (3.7 in) over the course of 9 days.

September Precipitation Trends in Bolton

The chart displays monthly precipitation patterns in Bolton, 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 Bolton, September typically receives around 93 mm (3.7 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1211611221781341321011359312580121
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bolton

In Bolton in September, humidity is 73%. With an average temperature of 26°C (79°F), this humidity feels like a warm, sticky embrace, making travel slightly uncomfortable as you navigate through the heat with a constant sheen of sweat on your skin.

September Average Humidity in Bolton

This chart illustrates the average monthly humidity levels in Bolton, 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 Bolton is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%83%80%82%83%80%80%75%73%76%84%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bolton

In Bolton in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Bolton.

Maximum UV Index Levels in Bolton for September

The chart shows the monthly maximum UV Index (UVI) for Bolton 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 Bolton typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec478111112121110864
Data source: Bolton 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 Bolton Compares to Other Months

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

This table compares monthly weather conditions in Bolton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)121 mm (4.7 inches)84%moderate
February Weather12°C (53°F)161 mm (6.3 inches)83%high
March Weather16°C (61°F)122 mm (4.8 inches)80%very high
April Weather18°C (65°F)178 mm (7.0 inches)82%extreme
May Weather23°C (74°F)134 mm (5.3 inches)83%extreme
June Weather26°C (79°F)132 mm (5.2 inches)80%extreme
July Weather28°C (82°F)101 mm (4.0 inches)80%extreme
August Weather27°C (81°F)135 mm (5.3 inches)75%extreme
September Weather26°C (79°F)93 mm (3.7 inches)73%very high
October Weather20°C (69°F)125 mm (4.9 inches)76%very high
November Weather13°C (55°F)79 mm (3.1 inches)84%high
December Weather11°C (52°F)121 mm (4.8 inches)88%moderate

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