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September Weather in Shannon, United States

Last updated: June 24, 2025

In September, the average temperature in Shannon, United States is a pleasant 24°C (75°F), with fluctuations that can range from a cool 10°C (50°F) to a sizzling 36°C (97°F). Expect about 105 mm (4.1 in) of precipitation spread over 9 days, contributing to an average humidity of 64%.

September Temperature in Shannon

In September in Shannon, the average temperature is 24°C (75°F). The maximum can reach 36°C (97°F), while the minimum can be as low as 10°C (50°F). Whether you're looking to enjoy warm days or cool evenings, this climate provides a comfortable backdrop for exploring and enjoying all that Shannon has to offer.

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

The chart illustrates September temperature patterns in Shannon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Shannon, September typically has an average temperature of 24°C (75°F), with highs reaching up to 36°C (97°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec455056627177807975665248
Data source: Temperature data for Shannon 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 Shannon

In Shannon in September, the total precipitation amount reaches 105 mm (4.1 in) over the course of 9 days.

September Precipitation Trends in Shannon

The chart displays monthly precipitation patterns in Shannon, 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 Shannon, September typically receives around 105 mm (4.1 inches) of precipitation spread over approximately 9 days.
JanFebMarAprMayJunJulAugSepOctNovDec1111671421329511911213610512785134
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Shannon

In Shannon in September humidity is 64%. With average temperature 24°C (75°F), this humidity feels like a warm blanket enveloping you, making outdoor exploration both refreshing and a little sticky, perfect for leisurely strolls and shaded cafes but with a need for frequent water breaks.

September Average Humidity in Shannon

This chart illustrates the average monthly humidity levels in Shannon, 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 Shannon is approximately 64%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec87%87%85%82%83%82%78%67%64%75%87%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Shannon

In Shannon in September, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Shannon.

Maximum UV Index Levels in Shannon for September

The chart shows the monthly maximum UV Index (UVI) for Shannon 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 Shannon typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111119764
Data source: Shannon 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 Shannon Compares to Other Months

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

This table compares monthly weather conditions in Shannon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)111 mm (4.4 inches)87%moderate
February Weather10°C (51°F)167 mm (6.6 inches)87%high
March Weather13°C (56°F)142 mm (5.6 inches)85%very high
April Weather17°C (62°F)132 mm (5.2 inches)82%very high
May Weather22°C (72°F)95 mm (3.8 inches)83%extreme
June Weather25°C (77°F)119 mm (4.7 inches)82%extreme
July Weather27°C (80°F)112 mm (4.4 inches)78%extreme
August Weather26°C (79°F)136 mm (5.3 inches)67%extreme
September Weather24°C (75°F)105 mm (4.1 inches)64%very high
October Weather19°C (66°F)127 mm (5.0 inches)74%high
November Weather11°C (52°F)85 mm (3.3 inches)87%high
December Weather9°C (48°F)134 mm (5.3 inches)88%moderate

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