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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 19°C (67°F). Visitors can expect a range from a chilly 2°C (36°F) to a warm 33°C (92°F). During this month, precipitation totals around 121 mm (4.8 in) over 10 days, contributing to an average humidity of 79%. Make sure to pack accordingly!

September Temperature in Shannon

In September in Shannon, the average temperature is 19°C (67°F), with maximums reaching 33°C (92°F) and minimums dropping as low as 2°C (36°F). This range makes it a great time to visit for those who enjoy mild weather but should be prepared for both warm days and cooler nights.

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 19°C (67°F), with highs reaching up to 33°C (92°F) and lows dropping to around 2°C (36°F).
JanFebMarAprMayJunJulAugSepOctNovDec222438476172757266523731
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 precipitation amount is 121 mm (4.8 in) spread over a period of 10 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 121 mm (4.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec58587310014811984931211104650
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 79%. With an average temperature of 19°C (67°F), this humidity feels like a warm, enveloping blanket that makes traveling a bit more challenging, as the air is thick and can leave you feeling sluggish during outdoor adventures.

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 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%85%85%85%78%80%78%76%79%83%88%82%
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 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 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 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098532
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 Weather-5°C (23°F)58 mm (2.3 inches)85%moderate
February Weather-4°C (25°F)58 mm (2.3 inches)85%moderate
March Weather3°C (38°F)73 mm (2.9 inches)85%high
April Weather9°C (48°F)100 mm (3.9 inches)85%very high
May Weather16°C (61°F)148 mm (5.8 inches)78%very high
June Weather22°C (72°F)119 mm (4.7 inches)80%very high
July Weather24°C (76°F)84 mm (3.3 inches)78%very high
August Weather22°C (72°F)93 mm (3.7 inches)76%very high
September Weather19°C (67°F)121 mm (4.8 inches)79%very high
October Weather11°C (53°F)110 mm (4.3 inches)83%moderate
November Weather3°C (37°F)46 mm (1.8 inches)88%moderate
December Weather-1°C (31°F)50 mm (2.0 inches)81%low

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