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September Weather in Shannon, United States

Last updated: June 24, 2025

In Shannon, United States, the average temperature in September is a pleasant 25°C (77°F). However, be prepared for a range of temperatures, as the minimum can drop to 10°C (50°F) while the maximum can soar to 38°C (100°F). During this month, you can expect around 90 mm (3.5 in) of precipitation spread over 8 days, contributing to an average humidity of 74%. Stay comfortable and enjoy your time in this vibrant locale!

September Temperature in Shannon

In September in Shannon, the average temperature is 25°C (77°F), with maximums reaching up to 38°C (100°F) and minimums dropping as low as 10°C (50°F). It’s an ideal time to travel to Shannon if you enjoy warm weather and are prepared for some temperature variations.

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 25°C (77°F), with highs reaching up to 38°C (100°F) and lows dropping to around 10°C (50°F).
JanFebMarAprMayJunJulAugSepOctNovDec455057627278818177665249
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 90 mm (3.5 in) spread over 8 days, indicating a relatively wet period for the region.

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 90 mm (3.5 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec1241901611591221341041269011173142
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 74%. With an average temperature of 25°C (77°F), this humidity feels like a warm, muggy blanket wrapping around you, making travel a bit more challenging as you find yourself sticky and in need of frequent breaks to hydrate and cool down.

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 74%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec85%84%82%82%82%79%82%77%74%73%85%88%
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.
JanFebMarAprMayJunJulAugSepOctNovDec47810111111109764
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)124 mm (4.9 inches)85%moderate
February Weather10°C (50°F)190 mm (7.5 inches)84%high
March Weather14°C (58°F)161 mm (6.3 inches)82%very high
April Weather17°C (63°F)159 mm (6.3 inches)82%very high
May Weather22°C (73°F)122 mm (4.8 inches)82%extreme
June Weather26°C (79°F)134 mm (5.3 inches)79%extreme
July Weather27°C (82°F)104 mm (4.1 inches)82%extreme
August Weather27°C (81°F)126 mm (5.0 inches)77%very high
September Weather25°C (77°F)90 mm (3.5 inches)74%very high
October Weather19°C (66°F)111 mm (4.4 inches)73%high
November Weather11°C (52°F)73 mm (2.9 inches)85%high
December Weather9°C (49°F)142 mm (5.6 inches)88%moderate

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