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September Weather in Renton, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Renton, United Kingdom hovers around 12°C (55°F). Expect a minimum of -3°C (27°F) and a maximum of 25°C (77°F). Throughout the month, precipitation totals 108 mm (4.2 in), typically spread over 16 days, while the air maintains a notable average humidity of 88%.

September Temperature in Renton

In September in Renton, the average temperature is 12°C (55°F). Maximums can reach 25°C (77°F) and minimums can be as low as -3°C (27°F). This makes it an ideal time for travelers to enjoy a mix of mild weather and cooler days, perfect for exploring the local sights.

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

The chart illustrates September temperature patterns in Renton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Renton, September typically has an average temperature of 12°C (55°F), with highs reaching up to 25°C (77°F) and lows dropping to around -3°C (27°F).
JanFebMarAprMayJunJulAugSepOctNovDec404042455156595854494441
Data source: Temperature data for Renton 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 Renton

In Renton in September, the precipitation amount is 108 mm (4.2 in), falling over the course of 16 days.

September Precipitation Trends in Renton

The chart displays monthly precipitation patterns in Renton, 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 Renton, September typically receives around 108 mm (4.2 inches) of precipitation spread over approximately 16 days.
JanFebMarAprMayJunJulAugSepOctNovDec991661275075118103145108166134139
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Renton

In Renton in September humidity is 88%. With an average temperature of 12°C (55°F), this humidity feels like a damp chill that clings to your skin, making outdoor exploration more challenging and requiring extra layers for comfort.

September Average Humidity in Renton

This chart illustrates the average monthly humidity levels in Renton, 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 Renton is approximately 88%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%88%86%85%81%83%82%82%88%90%92%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Renton

In Renton 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 Renton.

Maximum UV Index Levels in Renton for September

The chart shows the monthly maximum UV Index (UVI) for Renton 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 Renton typically reaches 5, which falls under the moderate exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec123568865311
Data source: Renton 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 Renton Compares to Other Months

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

This table compares monthly weather conditions in Renton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)99 mm (3.9 inches)90%low
February Weather5°C (41°F)166 mm (6.5 inches)88%low
March Weather6°C (42°F)127 mm (5.0 inches)86%moderate
April Weather7°C (46°F)50 mm (2.0 inches)85%moderate
May Weather11°C (51°F)75 mm (3.0 inches)80%high
June Weather14°C (57°F)118 mm (4.6 inches)83%very high
July Weather15°C (59°F)103 mm (4.1 inches)82%very high
August Weather14°C (58°F)145 mm (5.7 inches)82%high
September Weather12°C (55°F)108 mm (4.2 inches)88%moderate
October Weather10°C (50°F)166 mm (6.5 inches)90%moderate
November Weather7°C (44°F)134 mm (5.3 inches)92%low
December Weather5°C (41°F)139 mm (5.5 inches)89%low

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