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September Weather in Harlan, United States

Last updated: June 24, 2025

In Harlan, United States, the average temperature in September is a pleasant 20°C (68°F). Expect a minimum drop to 4°C (40°F), while it can also reach a maximum of 35°C (95°F). During this month, anticipate 97 mm (3.8 in) of precipitation spread across 10 days, with an average humidity level of 75%.

September Temperature in Harlan

In September in Harlan, the average temperature is 20°C (68°F). Maximums can reach 35°C (95°F), and minimums can be as low as 4°C (40°F). This makes Harlan an ideal destination for travelers, offering pleasant weather for a variety of outdoor activities.

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

The chart illustrates September temperature patterns in Harlan, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harlan, September typically has an average temperature of 20°C (68°F), with highs reaching up to 35°C (95°F) and lows dropping to around 4°C (40°F).
JanFebMarAprMayJunJulAugSepOctNovDec232339486174767368513830
Data source: Temperature data for Harlan 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 Harlan

In Harlan in September, the total precipitation amount is 97 mm (3.8 in) over a span of 10 days.

September Precipitation Trends in Harlan

The chart displays monthly precipitation patterns in Harlan, 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 Harlan, September typically receives around 97 mm (3.8 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec2938835816711070117971243537
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harlan

In Harlan in September, humidity is 75%. With an average temperature of 20°C (68°F), this humidity feels like a warm, muggy embrace that can leave travelers feeling sticky and exhausted.

September Average Humidity in Harlan

This chart illustrates the average monthly humidity levels in Harlan, 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 Harlan is approximately 75%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec76%80%73%75%78%82%83%81%75%75%82%83%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harlan

In Harlan 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 Harlan.

Maximum UV Index Levels in Harlan for September

The chart shows the monthly maximum UV Index (UVI) for Harlan 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 Harlan typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356810111098643
Data source: Harlan 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 Harlan Compares to Other Months

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

This table compares monthly weather conditions in Harlan, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)29 mm (1.1 inches)76%moderate
February Weather-5°C (24°F)38 mm (1.5 inches)80%moderate
March Weather4°C (39°F)82 mm (3.2 inches)73%high
April Weather9°C (49°F)58 mm (2.3 inches)74%very high
May Weather16°C (61°F)167 mm (6.6 inches)78%very high
June Weather23°C (74°F)110 mm (4.3 inches)82%extreme
July Weather25°C (76°F)70 mm (2.8 inches)83%very high
August Weather23°C (73°F)117 mm (4.6 inches)80%very high
September Weather20°C (68°F)97 mm (3.8 inches)75%very high
October Weather11°C (51°F)124 mm (4.9 inches)75%high
November Weather3°C (38°F)35 mm (1.4 inches)82%moderate
December Weather-1°C (30°F)37 mm (1.5 inches)83%moderate

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