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September Weather in Lanark, United States

Last updated: June 24, 2025

In Lanark, United States, the average temperature in September hovers around 20°C (67°F), with a comfortable range that can dip to a chilly 3°C (37°F) or peak at a warm 34°C (93°F). Be prepared for some rainfall, as 119 mm (4.7 in) of precipitation is expected over 10 days, accompanied by an average humidity of 80%. Stay cool and dry while enjoying the natural beauty of the season!

September Temperature in Lanark

In September in Lanark, the average temperature is 20°C (67°F). The maximum can reach 34°C (93°F), while the minimum can be as low as 3°C (37°F). This varied climate makes it a great time for travelers to experience both warm and cool activities in Lanark.

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

The chart illustrates September temperature patterns in Lanark, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Lanark, September typically has an average temperature of 20°C (67°F), with highs reaching up to 34°C (93°F) and lows dropping to around 3°C (37°F).
JanFebMarAprMayJunJulAugSepOctNovDec232539486172757267533831
Data source: Temperature data for Lanark 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 Lanark

In Lanark in September, the total precipitation amount is 119 mm (4.7 in) over the span of 10 days.

September Precipitation Trends in Lanark

The chart displays monthly precipitation patterns in Lanark, 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 Lanark, September typically receives around 119 mm (4.7 inches) of precipitation spread over approximately 10 days.
JanFebMarAprMayJunJulAugSepOctNovDec59598210814812989821191134951
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Lanark

In Lanark in September, humidity is 80%. With an average temperature of 20°C (67°F), this humidity feels like a warm embrace that can make outdoor activities feel sticky and heavy, potentially draining your energy as you explore.

September Average Humidity in Lanark

This chart illustrates the average monthly humidity levels in Lanark, 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 Lanark is approximately 80%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec82%83%84%85%79%82%80%81%80%82%88%84%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Lanark

In Lanark 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 Lanark.

Maximum UV Index Levels in Lanark for September

The chart shows the monthly maximum UV Index (UVI) for Lanark 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 Lanark typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec34689101098632
Data source: Lanark 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 Lanark Compares to Other Months

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

This table compares monthly weather conditions in Lanark, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-5°C (23°F)59 mm (2.3 inches)82%moderate
February Weather-4°C (25°F)59 mm (2.3 inches)83%moderate
March Weather4°C (39°F)82 mm (3.2 inches)84%high
April Weather9°C (48°F)108 mm (4.2 inches)85%very high
May Weather16°C (61°F)148 mm (5.8 inches)79%very high
June Weather22°C (72°F)129 mm (5.1 inches)82%very high
July Weather24°C (76°F)89 mm (3.5 inches)80%very high
August Weather22°C (73°F)82 mm (3.2 inches)81%very high
September Weather20°C (67°F)119 mm (4.7 inches)80%very high
October Weather12°C (53°F)113 mm (4.4 inches)82%high
November Weather3°C (38°F)49 mm (1.9 inches)88%moderate
December Weather0°C (32°F)51 mm (2.0 inches)84%low

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