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September Weather in Walden, United States

Last updated: June 24, 2025

In September, the average temperature in Walden, United States hovers around 11°C (52°F), with potential extremes ranging from a chilly -8°C (18°F) to a warm 28°C (83°F). Visitors can expect a moderate precipitation amount of 29 mm (1.1 in) over approximately 5 days, paired with an average humidity of 63%. Whether you're embracing the cool or enjoying the heat, September offers a unique climate experience!

September Temperature in Walden

In September in Walden, the average temperature is 11°C (52°F), with maximums reaching 28°C (83°F) and minimums dropping to as low as -8°C (18°F). Be prepared for a wide range of temperatures, making it essential to pack accordingly for your trip.

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

The chart illustrates September temperature patterns in Walden, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Walden, September typically has an average temperature of 11°C (52°F), with highs reaching up to 28°C (83°F) and lows dropping to around -8°C (18°F).
JanFebMarAprMayJunJulAugSepOctNovDec171927324054615952352517
Data source: Temperature data for Walden 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 Walden

In Walden in September, the total precipitation amount is 29 mm (1.1 in) recorded over a span of 5 days.

September Precipitation Trends in Walden

The chart displays monthly precipitation patterns in Walden, 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 Walden, September typically receives around 29 mm (1.1 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec436352515836282829474348
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Walden

In Walden in September humidity is 63%. With an average temperature of 11°C (52°F), this humidity feels like a cool, brisk breeze that adds a layer of freshness to your travels, making outdoor explorations invigorating yet comfortable.

September Average Humidity in Walden

This chart illustrates the average monthly humidity levels in Walden, 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 Walden is approximately 63%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%86%75%67%67%68%62%63%63%72%80%85%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Walden

In Walden in September, the maximum UV index reaches 10, which corresponds to a very high Exposure Category. With a time to burn of just 15 minutes, it's crucial to take precautions. For more detailed information, you can check the Hourly UV Index in Walden.

Maximum UV Index Levels in Walden for September

The chart shows the monthly maximum UV Index (UVI) for Walden 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 Walden typically reaches 10, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec469121213121110753
Data source: Walden 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 Walden Compares to Other Months

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

This table compares monthly weather conditions in Walden, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-8°C (17°F)43 mm (1.7 inches)84%moderate
February Weather-7°C (19°F)63 mm (2.5 inches)85%high
March Weather-3°C (27°F)52 mm (2.1 inches)75%very high
April Weather0°C (32°F)51 mm (2.0 inches)67%extreme
May Weather5°C (41°F)58 mm (2.3 inches)67%extreme
June Weather12°C (55°F)36 mm (1.4 inches)68%extreme
July Weather16°C (61°F)28 mm (1.1 inches)62%extreme
August Weather15°C (59°F)28 mm (1.1 inches)63%extreme
September Weather11°C (52°F)29 mm (1.1 inches)63%very high
October Weather2°C (35°F)47 mm (1.9 inches)72%high
November Weather-4°C (25°F)43 mm (1.7 inches)79%moderate
December Weather-8°C (17°F)48 mm (1.9 inches)85%moderate

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