nomadseason

September Weather in Cynwyd, United Kingdom

Last updated: August 27, 2025

In September, the average temperature in Cynwyd, United Kingdom hovers around 13°C (55°F). Visitors can expect a minimum of 1°C (34°F) and a maximum of 26°C (79°F). This month also brings about 100 mm (3.9 in) of precipitation spread over 14 days, contributing to an average humidity level of 85%. Stay prepared for a mix of cool and warmer days!

September Temperature in Cynwyd

In September in Cynwyd, the average temperature is 13°C (55°F). Maximums can reach 26°C (79°F) and minimums can be as low as 1°C (34°F). Travelers should be prepared for a range of temperatures, making layered clothing a wise choice during this time.

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

The chart illustrates September temperature patterns in Cynwyd, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cynwyd, September typically has an average temperature of 13°C (55°F), with highs reaching up to 26°C (79°F) and lows dropping to around 1°C (34°F).
JanFebMarAprMayJunJulAugSepOctNovDec394042465157595855504441
Data source: Temperature data for Cynwyd generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Cynwyd

In Cynwyd in September, the total precipitation amount is 100 mm (3.9 in) spread over 14 days.

September Precipitation Trends in Cynwyd

The chart displays monthly precipitation patterns in Cynwyd, 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 Cynwyd, September typically receives around 100 mm (3.9 inches) of precipitation spread over approximately 14 days.
JanFebMarAprMayJunJulAugSepOctNovDec791111126377998911510011692126
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
Choose your preferred precipitation unit

September Humidity in Cynwyd

In Cynwyd in September, humidity is 85%. With an average temperature of 13°C (55°F), this humidity feels like a heavy blanket wrapping around you, making even short walks feel exhausting and urging travelers to seek shade and refreshment frequently.

September Average Humidity in Cynwyd

This chart illustrates the average monthly humidity levels in Cynwyd, 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 Cynwyd 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 Cynwyd

In Cynwyd 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 Cynwyd.

Maximum UV Index Levels in Cynwyd for September

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

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

This table compares monthly weather conditions in Cynwyd, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (40°F)79 mm (3.1 inches)89%low
February Weather5°C (41°F)111 mm (4.4 inches)88%low
March Weather6°C (42°F)112 mm (4.4 inches)86%moderate
April Weather8°C (46°F)63 mm (2.5 inches)84%moderate
May Weather10°C (51°F)77 mm (3.0 inches)79%high
June Weather14°C (57°F)99 mm (3.9 inches)81%very high
July Weather15°C (60°F)89 mm (3.5 inches)78%very high
August Weather15°C (59°F)115 mm (4.5 inches)79%high
September Weather13°C (55°F)100 mm (3.9 inches)85%moderate
October Weather10°C (50°F)116 mm (4.6 inches)90%moderate
November Weather7°C (44°F)92 mm (3.6 inches)91%low
December Weather5°C (41°F)126 mm (5.0 inches)89%low

Compare Cynwyd's Climate with Cities Worldwide