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September Weather in Klamath, United States

Last updated: June 24, 2025

In September, the average temperature in Klamath, United States is a pleasant 15°C (60°F). However, be prepared for temperatures that can dip to a cool 6°C (43°F) or soar to a warm 31°C (88°F). You can expect 52 mm (2.0 in) of rainfall over approximately 4 days, with an average humidity of 62% adding to the overall climate experience.

September Temperature in Klamath

In September in Klamath, the average temperature is 15°C (60°F). Maximums can reach 31°C (88°F) while minimums can dip as low as 6°C (43°F). It's a great time for travelers to enjoy mild weather and experience diverse outdoor activities.

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

The chart illustrates September temperature patterns in Klamath, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Klamath, September typically has an average temperature of 15°C (60°F), with highs reaching up to 31°C (88°F) and lows dropping to around 6°C (43°F).
JanFebMarAprMayJunJulAugSepOctNovDec454445495258616260544945
Data source: Temperature data for Klamath 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 Klamath

In Klamath in September, the total precipitation amount reaches 52 mm (2.0 in) over a span of 4 days.

September Precipitation Trends in Klamath

The chart displays monthly precipitation patterns in Klamath, 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 Klamath, September typically receives around 52 mm (2.0 inches) of precipitation spread over approximately 4 days.
JanFebMarAprMayJunJulAugSepOctNovDec2962672181516932355285198223
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Klamath

In Klamath in September, humidity is 62%. With an average temperature of 15°C (60°F), this humidity feels like a warm embrace, making it a bit muggy for traveling, yet pleasantly refreshing for leisurely strolls and outdoor exploration.

September Average Humidity in Klamath

This chart illustrates the average monthly humidity levels in Klamath, 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 Klamath is approximately 62%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec86%85%85%82%81%79%70%60%62%72%87%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Klamath

In Klamath 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 Klamath.

Maximum UV Index Levels in Klamath for September

The chart shows the monthly maximum UV Index (UVI) for Klamath 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 Klamath typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3478101110108642
Data source: Klamath 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 Klamath Compares to Other Months

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

This table compares monthly weather conditions in Klamath, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather7°C (45°F)296 mm (11.7 inches)86%moderate
February Weather7°C (44°F)267 mm (10.5 inches)85%moderate
March Weather7°C (46°F)218 mm (8.6 inches)85%high
April Weather9°C (49°F)151 mm (5.9 inches)82%very high
May Weather11°C (53°F)69 mm (2.7 inches)81%very high
June Weather14°C (58°F)32 mm (1.3 inches)79%extreme
July Weather16°C (61°F)3 mm (0.1 inches)70%very high
August Weather17°C (62°F)5 mm (0.2 inches)60%very high
September Weather15°C (60°F)52 mm (2.0 inches)62%very high
October Weather12°C (54°F)85 mm (3.4 inches)72%high
November Weather9°C (49°F)198 mm (7.8 inches)87%moderate
December Weather7°C (45°F)223 mm (8.8 inches)86%low

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