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September Weather in Highland, United States

Last updated: June 24, 2025

In Highland, United States, the average temperature in September hovers around 23°C (73°F). However, be prepared for a range, as temperatures can dip to a chilly 7°C (45°F) at night and soar up to a sweltering 34°C (94°F) during the day. Expect 59 mm (2.3 in) of rain spread over 7 days, and keep in mind the high average humidity of 79%, which can make the warmth feel even more intense.

September Temperature in Highland

In September in Highland, the average temperature is 23°C (73°F). Maximums can reach 34°C (94°F), and minimums can be as low as 7°C (45°F). This weather makes Highland an ideal destination for travelers seeking both warm days and cooler evenings.

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

The chart illustrates September temperature patterns in Highland, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Highland, September typically has an average temperature of 23°C (73°F), with highs reaching up to 34°C (94°F) and lows dropping to around 7°C (45°F).
JanFebMarAprMayJunJulAugSepOctNovDec323647556877807673594439
Data source: Temperature data for Highland 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 Highland

In Highland in September, the precipitation amount is 59 mm (2.3 in) over a span of 7 days.

September Precipitation Trends in Highland

The chart displays monthly precipitation patterns in Highland, 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 Highland, September typically receives around 59 mm (2.3 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec818313914316710696120591057766
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Highland

In Highland in September humidity is 79%. With an average temperature of 23°C (73°F), this humidity feels like a warm embrace that clings to the skin, making travel feel both invigorating and slightly exhausting as the air wraps around you like a damp blanket.

September Average Humidity in Highland

This chart illustrates the average monthly humidity levels in Highland, 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 Highland is approximately 79%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%82%84%83%80%83%82%83%79%79%88%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Highland

In Highland 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 Highland.

Maximum UV Index Levels in Highland for September

The chart shows the monthly maximum UV Index (UVI) for Highland 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 Highland typically reaches 9, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec356910111099653
Data source: Highland 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 Highland Compares to Other Months

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

This table compares monthly weather conditions in Highland, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather0°C (33°F)80 mm (3.2 inches)84%moderate
February Weather2°C (36°F)83 mm (3.3 inches)82%moderate
March Weather8°C (47°F)139 mm (5.5 inches)84%high
April Weather13°C (56°F)143 mm (5.6 inches)83%very high
May Weather20°C (68°F)166 mm (6.6 inches)80%very high
June Weather25°C (77°F)106 mm (4.2 inches)83%extreme
July Weather26°C (80°F)96 mm (3.8 inches)82%very high
August Weather25°C (77°F)120 mm (4.7 inches)82%very high
September Weather23°C (73°F)59 mm (2.3 inches)79%very high
October Weather15°C (60°F)105 mm (4.1 inches)79%high
November Weather7°C (44°F)77 mm (3.0 inches)88%moderate
December Weather4°C (39°F)66 mm (2.6 inches)87%moderate

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