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September Weather in Logan, United States

Last updated: June 24, 2025

In September, the average temperature in Logan, United States hovers around 21°C (71°F). However, don't be surprised if you experience a range from a brisk 4°C (39°F) to a sizzling 37°C (99°F). With an average humidity of 73% and 72 mm (2.8 in) of precipitation over 5 days, be prepared for a mix of sunny and rainy weather.

September Temperature in Logan

In September in Logan, the average temperature is 21°C (71°F), with maximums reaching 37°C (99°F) and minimums dipping as low as 4°C (39°F). This range of temperatures makes it essential for travelers to pack both light clothing for warm days and warmer layers for cooler evenings.

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

The chart illustrates September temperature patterns in Logan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Logan, September typically has an average temperature of 21°C (71°F), with highs reaching up to 37°C (99°F) and lows dropping to around 4°C (39°F).
JanFebMarAprMayJunJulAugSepOctNovDec292943526376807670534334
Data source: Temperature data for Logan 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 Logan

In Logan in September, the precipitation amount is 72 mm (2.8 in) over a span of 5 days.

September Precipitation Trends in Logan

The chart displays monthly precipitation patterns in Logan, 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 Logan, September typically receives around 72 mm (2.8 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2418733916767789472591733
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Logan

In Logan in September humidity is 73%. With an average temperature of 21°C (71°F), this humidity feels like a warm, enveloping blanket that can make outdoor activities a bit uncomfortable, but with proper hydration and breaks in the shade, it’s still manageable for traveling.

September Average Humidity in Logan

This chart illustrates the average monthly humidity levels in Logan, 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 Logan is approximately 73%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec75%78%67%70%82%81%80%80%74%71%79%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Logan

In Logan 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 Logan.

Maximum UV Index Levels in Logan for September

The chart shows the monthly maximum UV Index (UVI) for Logan 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 Logan typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3579101111109643
Data source: Logan 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 Logan Compares to Other Months

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

This table compares monthly weather conditions in Logan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-2°C (29°F)24 mm (0.9 inches)74%moderate
February Weather-1°C (30°F)18 mm (0.7 inches)78%moderate
March Weather6°C (43°F)73 mm (2.9 inches)67%high
April Weather11°C (52°F)39 mm (1.5 inches)70%very high
May Weather17°C (63°F)167 mm (6.6 inches)82%very high
June Weather25°C (77°F)67 mm (2.6 inches)81%extreme
July Weather26°C (80°F)78 mm (3.1 inches)80%extreme
August Weather24°C (76°F)94 mm (3.7 inches)80%very high
September Weather21°C (71°F)72 mm (2.8 inches)73%very high
October Weather12°C (54°F)59 mm (2.3 inches)71%high
November Weather6°C (43°F)17 mm (0.7 inches)79%moderate
December Weather1°C (34°F)33 mm (1.3 inches)83%moderate

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