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September Weather in Harper, United States

Last updated: June 24, 2025

In September, the average temperature in Harper, United States hovers around 25°C (77°F), providing a pleasant climate for visitors. However, temperatures can fluctuate significantly, dipping as low as 8°C (47°F) and soaring to a sweltering 37°C (99°F). Expect around 95 mm (3.8 in) of precipitation spread over about 8 days, contributing to an average humidity of 66%. Be prepared for a range of weather, and enjoy what Harper has to offer!

September Temperature in Harper

In September, in Harper, the average temperature is 25°C (77°F), with maximums reaching 37°C (99°F) and minimums dropping as low as 8°C (47°F). Be prepared for a wide range of temperatures during your travels!

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

The chart illustrates September temperature patterns in Harper, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Harper, September typically has an average temperature of 25°C (77°F), with highs reaching up to 37°C (99°F) and lows dropping to around 8°C (47°F).
JanFebMarAprMayJunJulAugSepOctNovDec495161667479828277685752
Data source: Temperature data for Harper 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 Harper

In Harper in September, the precipitation amount is 95 mm (3.8 in) accumulated over 8 days.

September Precipitation Trends in Harper

The chart displays monthly precipitation patterns in Harper, 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 Harper, September typically receives around 95 mm (3.8 inches) of precipitation spread over approximately 8 days.
JanFebMarAprMayJunJulAugSepOctNovDec3946618014354434795762534
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Harper

In Harper in September humidity is 66%. With an average temperature of 25°C (77°F), this humidity feels like a warm embrace, making travel a pleasant experience as the air is saturated but still breathable, allowing for comfortable exploration.

September Average Humidity in Harper

This chart illustrates the average monthly humidity levels in Harper, 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 Harper is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec78%78%77%78%82%78%69%63%66%73%84%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Harper

In Harper in September, the maximum UV index reaches 11, which corresponds to an extreme Exposure Category. With a time to burn of just 10 minutes, it's essential to take precautions. For more details, you can check the Hourly UV Index in Harper.

Maximum UV Index Levels in Harper for September

The chart shows the monthly maximum UV Index (UVI) for Harper 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 Harper typically reaches 11, which falls under the extreme exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec589111112121211965
Data source: Harper 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 Harper Compares to Other Months

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

This table compares monthly weather conditions in Harper, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather9°C (49°F)39 mm (1.5 inches)78%moderate
February Weather11°C (52°F)46 mm (1.8 inches)78%very high
March Weather16°C (61°F)61 mm (2.4 inches)77%very high
April Weather19°C (66°F)80 mm (3.2 inches)78%extreme
May Weather23°C (74°F)143 mm (5.6 inches)82%extreme
June Weather26°C (79°F)54 mm (2.1 inches)78%extreme
July Weather28°C (82°F)43 mm (1.7 inches)69%extreme
August Weather28°C (82°F)47 mm (1.9 inches)63%extreme
September Weather25°C (77°F)95 mm (3.8 inches)66%extreme
October Weather20°C (68°F)76 mm (3.0 inches)73%very high
November Weather14°C (58°F)25 mm (1.0 inches)84%high
December Weather11°C (53°F)34 mm (1.3 inches)87%moderate

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