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September Weather in Somerset, United States

Last updated: June 24, 2025

In September, the average temperature in Somerset, United States hovers around 18°C (64°F), with a pleasant range from a cool 2°C (35°F) to a warm 30°C (86°F). Expect 129 mm (5.1 in) of precipitation spread across 11 days, contributing to an average humidity level of 68%. Enjoy the diverse weather as you explore this vibrant locale!

September Temperature in Somerset

In September in Somerset, the average temperature is 18°C (64°F). Maximums can reach 30°C (86°F), while minimums can drop to as low as 2°C (35°F). This range makes Somerset an ideal destination for travelers seeking a mild climate with opportunities for both warm and cooler outdoor activities.

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

The chart illustrates September temperature patterns in Somerset, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Somerset, September typically has an average temperature of 18°C (64°F), with highs reaching up to 30°C (86°F) and lows dropping to around 2°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec283238485966716964543933
Data source: Temperature data for Somerset 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 Somerset

In Somerset in September, the precipitation amount is 129 mm (5.1 in) spread over 11 days, indicating a wet period for the area.

September Precipitation Trends in Somerset

The chart displays monthly precipitation patterns in Somerset, 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 Somerset, September typically receives around 129 mm (5.1 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec8312911213015315711911212911583113
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Somerset

In Somerset in September, humidity is 68%. With an average temperature of 18°C (64°F), this humidity feels like a warm embrace, making for a slightly muggy experience that can leave you feeling sticky as you explore, so it’s best to stay hydrated and take frequent breaks in the shade.

September Average Humidity in Somerset

This chart illustrates the average monthly humidity levels in Somerset, 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 Somerset is approximately 68%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%86%86%84%78%79%70%59%68%80%87%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Somerset

In Somerset 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 Somerset.

Maximum UV Index Levels in Somerset for September

The chart shows the monthly maximum UV Index (UVI) for Somerset 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 Somerset typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101010108753
Data source: Somerset 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 Somerset Compares to Other Months

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

This table compares monthly weather conditions in Somerset, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (28°F)83 mm (3.3 inches)86%moderate
February Weather0°C (33°F)128 mm (5.1 inches)86%moderate
March Weather3°C (38°F)112 mm (4.4 inches)86%high
April Weather9°C (48°F)130 mm (5.1 inches)84%very high
May Weather15°C (59°F)152 mm (6.0 inches)78%very high
June Weather19°C (67°F)157 mm (6.2 inches)79%very high
July Weather22°C (71°F)119 mm (4.7 inches)70%very high
August Weather21°C (70°F)112 mm (4.4 inches)59%very high
September Weather18°C (64°F)129 mm (5.1 inches)68%very high
October Weather12°C (54°F)115 mm (4.5 inches)80%high
November Weather4°C (39°F)83 mm (3.3 inches)86%moderate
December Weather1°C (33°F)113 mm (4.4 inches)85%moderate

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