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September Weather in Harlan, United States

Last updated: June 24, 2025

In Harlan, United States, the average temperature in September hovers around 21°C (69°F), offering a pleasant climate. The temperatures can dip as low as 6°C (43°F) and peak at a warm 33°C (92°F). Expect some rain, with an average precipitation of 104 mm (4.1 in) over about 10 days. Additionally, the average humidity level is around 67%, making for a beautifully balanced atmosphere.

September Temperature in Harlan

In September in Harlan, the average temperature is 21°C (69°F), with maximums reaching 33°C (92°F) and minimums dropping as low as 6°C (43°F). This makes it an ideal time for travelers to enjoy a diverse range of activities, from enjoying warm days to experiencing cooler evenings.

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 21°C (69°F), with highs reaching up to 33°C (92°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec374248556570757369594541
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 precipitation amount is 104 mm (4.1 in) over a period 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 104 mm (4.1 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec9719314516314513212113810413981136
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 67%. With an average temperature of 21°C (69°F), this humidity feels like a warm, enveloping embrace, making travel enjoyable yet slightly sticky. It encourages you to seek shade and sip cool drinks while exploring, adding a tropical flair to your adventures.

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 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec88%88%87%84%84%83%79%66%67%76%89%88%
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 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 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 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec46810111111109753
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 Weather3°C (37°F)97 mm (3.8 inches)88%moderate
February Weather6°C (43°F)193 mm (7.6 inches)88%high
March Weather9°C (48°F)145 mm (5.7 inches)87%very high
April Weather13°C (56°F)163 mm (6.4 inches)84%very high
May Weather18°C (65°F)145 mm (5.7 inches)84%extreme
June Weather21°C (71°F)132 mm (5.2 inches)83%extreme
July Weather24°C (75°F)121 mm (4.8 inches)79%extreme
August Weather23°C (73°F)138 mm (5.4 inches)66%very high
September Weather21°C (69°F)104 mm (4.1 inches)67%very high
October Weather15°C (60°F)139 mm (5.5 inches)76%high
November Weather7°C (45°F)81 mm (3.2 inches)89%moderate
December Weather5°C (41°F)136 mm (5.3 inches)88%moderate

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