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September Weather in Boston Spa, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Boston Spa, United Kingdom hovers around 14°C (57°F), with a minimum dip to 3°C (38°F) and a maximum rise to 28°C (83°F). Expect about 63 mm (2.5 in) of precipitation over approximately 11 days, contributing to an average humidity of 85%. Stay prepared for a mix of mild temperatures and occasional rain!

September Temperature in Boston Spa

In September in Boston Spa, the average temperature is 14°C (57°F). The maximum can reach 28°C (83°F), and the minimum can be as low as 3°C (38°F). This makes Boston Spa an ideal destination for travelers seeking a mild climate with pleasant daytime warmth and cooler evenings.

September Weather in Boston Spa: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Boston Spa, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Boston Spa, September typically has an average temperature of 14°C (57°F), with highs reaching up to 28°C (83°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec404244475359626157524541
Data source: Temperature data for Boston Spa 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 Boston Spa

In Boston Spa in September, the precipitation amount is 63 mm (2.5 in) during a total of 11 days.

September Precipitation Trends in Boston Spa

The chart displays monthly precipitation patterns in Boston Spa, 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 Boston Spa, September typically receives around 63 mm (2.5 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec497064366277707363855772
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Boston Spa

In Boston Spa 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 Boston Spa

This chart illustrates the average monthly humidity levels in Boston Spa, 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 Boston Spa is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%84%80%81%76%77%85%90%92%90%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Boston Spa

In Boston Spa in September, the maximum UV index reaches 5, which corresponds to a moderate Exposure Category. Under these conditions, the estimated time to burn is approximately 30 minutes. For more details, you can check the Hourly UV Index in Boston Spa.

Maximum UV Index Levels in Boston Spa for September

The chart shows the monthly maximum UV Index (UVI) for Boston Spa 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 Boston Spa typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123578875321
Data source: Boston Spa 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 Boston Spa Compares to Other Months

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

This table compares monthly weather conditions in Boston Spa, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)49 mm (1.9 inches)90%low
February Weather5°C (42°F)70 mm (2.8 inches)88%low
March Weather7°C (44°F)64 mm (2.5 inches)86%moderate
April Weather8°C (47°F)36 mm (1.4 inches)84%moderate
May Weather12°C (53°F)62 mm (2.4 inches)80%high
June Weather15°C (59°F)77 mm (3.0 inches)81%very high
July Weather17°C (63°F)70 mm (2.8 inches)76%very high
August Weather16°C (62°F)73 mm (2.9 inches)77%high
September Weather14°C (57°F)63 mm (2.5 inches)85%moderate
October Weather11°C (52°F)85 mm (3.3 inches)90%moderate
November Weather7°C (46°F)57 mm (2.2 inches)92%low
December Weather5°C (42°F)72 mm (2.8 inches)90%low

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