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September Weather in Roscommon, United States

Last updated: June 24, 2025

In September, the average temperature in Roscommon, United States hovers around 16°C (61°F). While daytime highs can reach up to 33°C (93°F), cool nights may drop to a brisk 0°C (32°F). Expect some rain, with an average precipitation of 73 mm (2.9 in) over about 10 days, and enjoy the season's characteristic 79% humidity, adding a touch of warmth to the atmosphere.

September Temperature in Roscommon

In September in Roscommon, the average temperature is 16°C (61°F). Maximums can reach 33°C (93°F), while minimums can drop as low as 0°C (32°F). Be prepared for a wide range of temperatures, making it ideal to pack layers for your travels.

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

The chart illustrates September temperature patterns in Roscommon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Roscommon, September typically has an average temperature of 16°C (61°F), with highs reaching up to 33°C (93°F) and lows dropping to around 0°C (32°F).
JanFebMarAprMayJunJulAugSepOctNovDec212130415565716861483427
Data source: Temperature data for Roscommon 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 Roscommon

In Roscommon in September, the precipitation amount is 73 mm (2.9 in) over the course of 10 days.

September Precipitation Trends in Roscommon

The chart displays monthly precipitation patterns in Roscommon, 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 Roscommon, September typically receives around 73 mm (2.9 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec515254931071188790731186163
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Roscommon

In Roscommon in September humidity is 79%. With an average temperature of 16°C (61°F), this humidity feels like a warm, moist embrace, making travel a bit more challenging as the air tends to weigh heavily, but it also offers a refreshing atmosphere perfect for exploring local sights and enjoying nature.

September Average Humidity in Roscommon

This chart illustrates the average monthly humidity levels in Roscommon, 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 Roscommon is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec92%91%87%86%79%75%75%75%79%85%88%89%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Roscommon

In Roscommon in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Roscommon.

Maximum UV Index Levels in Roscommon for September

The chart shows the monthly maximum UV Index (UVI) for Roscommon 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 Roscommon typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2458910987532
Data source: Roscommon 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 Roscommon Compares to Other Months

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

This table compares monthly weather conditions in Roscommon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)50 mm (2.0 inches)92%low
February Weather-6°C (21°F)52 mm (2.1 inches)91%moderate
March Weather-1°C (31°F)54 mm (2.1 inches)87%moderate
April Weather5°C (42°F)93 mm (3.7 inches)85%very high
May Weather13°C (56°F)107 mm (4.2 inches)79%very high
June Weather19°C (66°F)118 mm (4.6 inches)75%very high
July Weather21°C (71°F)87 mm (3.4 inches)75%very high
August Weather20°C (68°F)90 mm (3.6 inches)75%very high
September Weather16°C (61°F)73 mm (2.9 inches)79%high
October Weather9°C (49°F)118 mm (4.6 inches)85%moderate
November Weather1°C (35°F)61 mm (2.4 inches)88%moderate
December Weather-3°C (27°F)63 mm (2.5 inches)89%low

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