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September Weather in Harlowton, United States

Last updated: June 24, 2025

In Harlowton, United States, the average temperature in September hovers around 14°C (57°F). Expect a minimum chill of -2°C (29°F), while the mercury can soar up to a sizzling 35°C (96°F). During this month, total precipitation reaches about 38 mm (1.5 in) over approximately 5 days, with an average humidity of 67%.

September Temperature in Harlowton

In September in Harlowton, the average temperature is 14°C (57°F). The maximum can reach 35°C (96°F), and the minimum can be as low as -2°C (29°F). Be prepared for a wide range of weather conditions during your travels to Harlowton this month.

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

The chart illustrates September temperature patterns in Harlowton, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harlowton, September typically has an average temperature of 14°C (57°F), with highs reaching up to 35°C (96°F) and lows dropping to around -2°C (29°F).
JanFebMarAprMayJunJulAugSepOctNovDec241832395061696757423326
Data source: Temperature data for Harlowton 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 Harlowton

In Harlowton in September, the total precipitation amount is 38 mm (1.5 in) spread over a duration of 5 days.

September Precipitation Trends in Harlowton

The chart displays monthly precipitation patterns in Harlowton, 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 Harlowton, September typically receives around 38 mm (1.5 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec194126636762182238332625
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harlowton

In Harlowton in September, humidity is 67%. With an average temperature of 14°C (57°F), this humidity feels like a cool, refreshing mist that invigorates your senses, making it quite pleasant for traveling, though a light jacket is recommended as the moisture in the air can create a brisk atmosphere.

September Average Humidity in Harlowton

This chart illustrates the average monthly humidity levels in Harlowton, 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 Harlowton is approximately 67%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec81%85%77%72%75%78%79%76%67%69%78%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harlowton

In Harlowton 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 Harlowton.

Maximum UV Index Levels in Harlowton for September

The chart shows the monthly maximum UV Index (UVI) for Harlowton 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 Harlowton typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec246891010108532
Data source: Harlowton 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 Harlowton Compares to Other Months

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

This table compares monthly weather conditions in Harlowton, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-4°C (24°F)19 mm (0.8 inches)81%low
February Weather-8°C (19°F)41 mm (1.6 inches)85%moderate
March Weather0°C (32°F)26 mm (1.0 inches)77%high
April Weather4°C (39°F)63 mm (2.5 inches)72%very high
May Weather10°C (51°F)67 mm (2.6 inches)75%very high
June Weather16°C (61°F)62 mm (2.4 inches)78%very high
July Weather21°C (69°F)17 mm (0.7 inches)79%very high
August Weather20°C (67°F)21 mm (0.8 inches)76%very high
September Weather14°C (57°F)38 mm (1.5 inches)67%very high
October Weather5°C (42°F)33 mm (1.3 inches)69%moderate
November Weather1°C (33°F)26 mm (1.0 inches)78%moderate
December Weather-3°C (27°F)25 mm (1.0 inches)85%low

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