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September Weather in Bethesda, United Kingdom

Last updated: August 27, 2025

In Bethesda, United Kingdom, the average temperature in September reaches a comfortable 14°C (57°F), with the minimum dipping to 2°C (36°F) and the maximum soaring to 27°C (81°F). Expect 100 mm (4.0 in) of precipitation over approximately 15 days, contributing to a notable average humidity of 85%. Embrace the varied climate as you navigate through this vibrant destination!

September Temperature in Bethesda

In September in Bethesda, the average temperature is 14°C (57°F), with maximums reaching 27°C (81°F) and minimums dropping as low as 2°C (36°F). This wide range of temperatures makes it a perfect time for travelers to pack layers and enjoy the diverse weather conditions.

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

The chart illustrates September temperature patterns in Bethesda, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Bethesda, September typically has an average temperature of 14°C (57°F), with highs reaching up to 27°C (81°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec424344475258616056524643
Data source: Temperature data for Bethesda 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 Bethesda

In Bethesda in September, the total precipitation amount is 100 mm (4.0 in) over the course of 15 days.

September Precipitation Trends in Bethesda

The chart displays monthly precipitation patterns in Bethesda, 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 Bethesda, September typically receives around 100 mm (4.0 inches) of precipitation spread over approximately 15 days.
JanFebMarAprMayJunJulAugSepOctNovDec7810310558789893109101122103128
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Bethesda

In Bethesda 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 Bethesda

This chart illustrates the average monthly humidity levels in Bethesda, 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 Bethesda is approximately 85%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%88%86%85%79%81%78%79%85%90%91%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Bethesda

In Bethesda 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 Bethesda.

Maximum UV Index Levels in Bethesda for September

The chart shows the monthly maximum UV Index (UVI) for Bethesda 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 Bethesda typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124578875421
Data source: Bethesda 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 Bethesda Compares to Other Months

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

This table compares monthly weather conditions in Bethesda, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (42°F)78 mm (3.1 inches)89%low
February Weather6°C (43°F)103 mm (4.1 inches)88%low
March Weather7°C (44°F)105 mm (4.1 inches)86%moderate
April Weather9°C (48°F)58 mm (2.3 inches)84%moderate
May Weather11°C (53°F)78 mm (3.1 inches)79%high
June Weather15°C (58°F)98 mm (3.8 inches)81%very high
July Weather16°C (61°F)93 mm (3.7 inches)78%very high
August Weather15°C (60°F)109 mm (4.3 inches)79%high
September Weather14°C (57°F)100 mm (4.0 inches)85%moderate
October Weather11°C (52°F)122 mm (4.8 inches)90%moderate
November Weather8°C (46°F)103 mm (4.1 inches)91%low
December Weather6°C (44°F)128 mm (5.0 inches)89%low

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