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September Weather in North Wales, United States

Last updated: June 24, 2025

In September, the average temperature in North Wales, United States is a pleasant 21°C (70°F). However, temperatures can vary significantly, dipping as low as 5°C (42°F) and soaring to a maximum of 34°C (94°F). Visitors should be prepared for a fair share of rain, with an average precipitation of 96 mm (3.8 in) over 10 days. Additionally, the average humidity hovers around 66%, creating a mild and enjoyable climate.

September Temperature in North Wales

In September in North Wales, the average temperature is 21°C (70°F), with maximums reaching up to 34°C (94°F) and minimums dropping as low as 5°C (42°F). This makes it an ideal time for travelers who enjoy warm weather but should also be prepared for cooler evenings.

September Weather in North Wales: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in North Wales, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In North Wales, September typically has an average temperature of 21°C (70°F), with highs reaching up to 34°C (94°F) and lows dropping to around 5°C (42°F).
JanFebMarAprMayJunJulAugSepOctNovDec343743536372787570604538
Data source: Temperature data for North Wales 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 North Wales

In North Wales in September, the total precipitation amount is 96 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in North Wales

The chart displays monthly precipitation patterns in North Wales, 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 North Wales, September typically receives around 96 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec671081081051441041481559610584102
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in North Wales

In North Wales in September humidity is 66%. With an average temperature of 21°C (70°F), this humidity feels like a warm embrace, making it comfortable for leisurely strolls but slightly sticky for longer excursions.

September Average Humidity in North Wales

This chart illustrates the average monthly humidity levels in North Wales, 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 North Wales is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%85%85%83%75%74%65%62%66%79%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in North Wales

In North Wales in September, the maximum UV index is 8, which corresponds to a very high Exposure Category. This means that the time to burn is only 15 minutes. For more detailed information, you can refer to the Hourly UV Index in North Wales.

Maximum UV Index Levels in North Wales for September

The chart shows the monthly maximum UV Index (UVI) for North Wales 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 North Wales typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810101098642
Data source: North Wales 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 North Wales Compares to Other Months

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

This table compares monthly weather conditions in North Wales, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather1°C (34°F)67 mm (2.6 inches)87%moderate
February Weather3°C (37°F)108 mm (4.3 inches)85%moderate
March Weather6°C (43°F)108 mm (4.3 inches)85%high
April Weather12°C (53°F)105 mm (4.1 inches)83%very high
May Weather17°C (63°F)144 mm (5.7 inches)75%very high
June Weather22°C (72°F)104 mm (4.1 inches)73%very high
July Weather25°C (78°F)148 mm (5.8 inches)65%very high
August Weather24°C (75°F)155 mm (6.1 inches)62%very high
September Weather21°C (70°F)96 mm (3.8 inches)66%very high
October Weather15°C (60°F)105 mm (4.2 inches)79%high
November Weather7°C (45°F)84 mm (3.3 inches)87%moderate
December Weather3°C (38°F)102 mm (4.0 inches)85%low

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