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September Weather in Merstham, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Merstham, United Kingdom is a comfortable 15°C (59°F), with a minimum dipping to 3°C (38°F) and a maximum soaring to 28°C (83°F). Expect 45 mm (1.8 in) of precipitation spread over about 9 days, while the air carries an average humidity of 82%. Perfect for those who enjoy a mix of mild weather and occasional showers!

September Temperature in Merstham

In September in Merstham, the average temperature is 15°C (59°F). The maximum can reach 28°C (83°F), while the minimum can drop as low as 3°C (38°F). Overall, this means travelers can expect mild weather perfect for exploring the outdoors.

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

The chart illustrates September temperature patterns in Merstham, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Merstham, September typically has an average temperature of 15°C (59°F), with highs reaching up to 28°C (83°F) and lows dropping to around 3°C (38°F).
JanFebMarAprMayJunJulAugSepOctNovDec414345495561656359534643
Data source: Temperature data for Merstham 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 Merstham

In Merstham in September, the precipitation amount is 45 mm (1.8 in) spread over 9 days.

September Precipitation Trends in Merstham

The chart displays monthly precipitation patterns in Merstham, 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 Merstham, September typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec535656356482667446865688
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Merstham

In Merstham in September, humidity is 82%. With an average temperature of 15°C (59°F), this humidity feels like a heavy blanket wrapping around you, making outdoor activities feel sticky and uncomfortable for travelers.

September Average Humidity in Merstham

This chart illustrates the average monthly humidity levels in Merstham, 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 Merstham is approximately 82%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec91%89%86%85%79%81%71%76%82%91%92%92%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Merstham

In Merstham in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Merstham, you can refer to this Hourly UV Index in Merstham.

Maximum UV Index Levels in Merstham for September

The chart shows the monthly maximum UV Index (UVI) for Merstham 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 Merstham typically reaches 6, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec124678876421
Data source: Merstham 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 Merstham Compares to Other Months

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

This table compares monthly weather conditions in Merstham, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather5°C (41°F)53 mm (2.1 inches)91%low
February Weather6°C (43°F)56 mm (2.2 inches)89%low
March Weather7°C (46°F)56 mm (2.2 inches)86%moderate
April Weather9°C (49°F)35 mm (1.4 inches)85%high
May Weather13°C (55°F)64 mm (2.5 inches)79%high
June Weather16°C (62°F)82 mm (3.2 inches)80%very high
July Weather18°C (65°F)66 mm (2.6 inches)71%very high
August Weather17°C (64°F)74 mm (2.9 inches)76%high
September Weather15°C (59°F)45 mm (1.8 inches)82%high
October Weather12°C (54°F)86 mm (3.4 inches)90%moderate
November Weather8°C (47°F)56 mm (2.2 inches)92%low
December Weather6°C (44°F)88 mm (3.5 inches)92%low

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