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September Weather in Cave Junction, United States

Last updated: June 24, 2025

In Cave Junction, United States, the average temperature in September is a comfortable 17°C (63°F). However, temperatures can vary widely, with a minimum of 1°C (35°F) and soaring up to 38°C (101°F). Expect about 45 mm (1.8 in) of precipitation spread over 5 days, and while exploring the area, you’ll experience an average humidity of 66%.

September Temperature in Cave Junction

In September in Cave Junction, the average temperature is 17°C (63°F). The maximum can reach 38°C (101°F), and the minimum can be as low as 1°C (35°F). Be prepared for varying temperatures, making it ideal to pack layers for your travels.

September Weather in Cave Junction: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Cave Junction, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Cave Junction, September typically has an average temperature of 17°C (63°F), with highs reaching up to 38°C (101°F) and lows dropping to around 1°C (35°F).
JanFebMarAprMayJunJulAugSepOctNovDec393942485563717063524438
Data source: Temperature data for Cave Junction 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 Cave Junction

In Cave Junction in September, the total precipitation amount is 45 mm (1.8 in) over a span of 5 days.

September Precipitation Trends in Cave Junction

The chart displays monthly precipitation patterns in Cave Junction, 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 Cave Junction, September typically receives around 45 mm (1.8 inches) of precipitation spread over approximately 5 days.
JanFebMarAprMayJunJulAugSepOctNovDec2462461791366630254571168199
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Cave Junction

In Cave Junction in September, humidity is 66%. With an average temperature of 17°C (63°F), this humidity feels like a warm embrace, making travel refreshing yet slightly muggy, perfect for leisurely strolls or picturesque outdoor explorations, but travelers should be prepared for occasional discomfort as they navigate the vibrant sights.

September Average Humidity in Cave Junction

This chart illustrates the average monthly humidity levels in Cave Junction, 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 Cave Junction is approximately 66%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec84%85%86%83%83%83%78%67%66%77%87%87%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Cave Junction

In Cave Junction 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 Cave Junction.

Maximum UV Index Levels in Cave Junction for September

The chart shows the monthly maximum UV Index (UVI) for Cave Junction 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 Cave Junction typically reaches 8, which falls under the very high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec3468111110108642
Data source: Cave Junction 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 Cave Junction Compares to Other Months

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

This table compares monthly weather conditions in Cave Junction, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather4°C (39°F)246 mm (9.7 inches)84%moderate
February Weather4°C (39°F)246 mm (9.7 inches)85%moderate
March Weather5°C (42°F)179 mm (7.1 inches)86%high
April Weather9°C (48°F)136 mm (5.4 inches)83%very high
May Weather13°C (55°F)66 mm (2.6 inches)83%extreme
June Weather17°C (63°F)30 mm (1.2 inches)83%extreme
July Weather21°C (71°F)2 mm (0.1 inches)78%very high
August Weather21°C (70°F)5 mm (0.2 inches)67%very high
September Weather17°C (63°F)45 mm (1.8 inches)66%very high
October Weather11°C (53°F)71 mm (2.8 inches)77%high
November Weather7°C (45°F)168 mm (6.6 inches)87%moderate
December Weather3°C (38°F)198 mm (7.8 inches)87%low

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