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September Weather in Sligo, United States

Last updated: June 24, 2025

In September, the average temperature in Sligo, United States is a pleasant 18°C (65°F). While you can expect minimum temperatures to dip to 3°C (37°F) and maximums to soar up to 32°C (90°F), the climate also brings about 126 mm (5.0 in) of precipitation over roughly 11 days. Overall, you’ll experience an average humidity of 67%, making for a well-rounded climate.

September Temperature in Sligo

In September in Sligo, the average temperature is 18°C (65°F). Maximum temperatures can reach up to 32°C (90°F), while the minimum can drop as low as 3°C (37°F). This varying climate makes it essential for travelers to pack for both warm and cool conditions.

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

The chart illustrates September temperature patterns in Sligo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sligo, September typically has an average temperature of 18°C (65°F), with highs reaching up to 32°C (90°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec283239496068737165554034
Data source: Temperature data for Sligo 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 Sligo

In Sligo in September, the total precipitation amount is 126 mm (5.0 in) spread over 11 days.

September Precipitation Trends in Sligo

The chart displays monthly precipitation patterns in Sligo, 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 Sligo, September typically receives around 126 mm (5.0 inches) of precipitation spread over approximately 11 days.
JanFebMarAprMayJunJulAugSepOctNovDec101119106136158139151110126130101103
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Sligo

In Sligo in September humidity is 67%. With an average temperature of 18°C (65°F), this humidity feels like a mild blanket wrapping around you, making outdoor activities feel pleasantly refreshing, yet you may find yourself reaching for a drink more often to stay hydrated while exploring the sights.

September Average Humidity in Sligo

This chart illustrates the average monthly humidity levels in Sligo, 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 Sligo is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec90%90%89%88%80%79%74%64%67%81%89%88%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Sligo

In Sligo 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 Sligo.

Maximum UV Index Levels in Sligo for September

The chart shows the monthly maximum UV Index (UVI) for Sligo 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 Sligo typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910101098642
Data source: Sligo 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 Sligo Compares to Other Months

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

This table compares monthly weather conditions in Sligo, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)101 mm (4.0 inches)89%moderate
February Weather0°C (33°F)119 mm (4.7 inches)90%moderate
March Weather4°C (39°F)106 mm (4.2 inches)89%high
April Weather9°C (49°F)136 mm (5.3 inches)88%very high
May Weather16°C (60°F)158 mm (6.2 inches)80%very high
June Weather20°C (68°F)139 mm (5.5 inches)79%very high
July Weather23°C (73°F)151 mm (6.0 inches)74%very high
August Weather22°C (71°F)110 mm (4.3 inches)64%very high
September Weather18°C (65°F)126 mm (5.0 inches)67%very high
October Weather13°C (55°F)130 mm (5.1 inches)81%high
November Weather4°C (40°F)101 mm (4.0 inches)89%moderate
December Weather1°C (34°F)103 mm (4.1 inches)88%low

Compare Sligo's Climate with Cities Worldwide