Crater Lake
Oregon, USA
Long-term weather forecast
Long-term weather forecast
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September weather forecast and Climate
Crater Lake, OR

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A beautiful landscape of the Crater Lake in Oregon, viewed from atop the Watchman
A beautiful landscape of the Crater Lake in Oregon, viewed from atop the Watchman's Peak, under a cloudy sky
September has mild weather and the last month before the ground freezes in Crater Lake. The average temperatures range from a cold 36°F (2.2°C) to warm 63°F (17.2°C) with many bright days having 9 hours of sunlight. September nights tend to be cold and occasionally freezing, so camping in the park area can be challenging.
The precipitation is only 2" (50.8mm) with the first snowflakes by the end of the month.
The lake is open for swimming and fishing and has plenty of salmon and trout. The lake view is panoramic, especially from high vantage points on the Rim Road.
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  • The average high temperature in September: 63.1°F

The warmest month (with the highest average high temperature) is August (69.7°F).
The month with the lowest average high temperature is December (33.6°F).

  • The average low temperature in September: 36.1°F

Months with the highest average low temperature are July and August (40.5°F).
The coldest month (with the lowest average low temperature) is February (17.8°F).

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  • The average rainfall in September: 2"

The wettest month (with the highest rainfall) is December (11.6").
Driest months (with the lowest rainfall) are July and August (1").

  • The average rainfall days in September: 5.8 days

The month with the highest number of rainy days is March (18.2 days).
The month with the lowest number of rainy days is July (3.9 days).

  • The average snowfall in September: 3.3"

The month with the highest snowfall is December (91.1").
The month with the lowest snowfall is August (0").

  • The average snowfall days in September: 1 days

The month with the highest number of snowfall days is December (16.4 days).
The month with the lowest number of snowfall days is August (0 days).

  • The average daylight in September: 12h

Months with the longest days are May, June and July (Average daylight: 15h).
Months with shortest days are January and December (Average daylight: 9h).

  • The average sunshine in September: 9h

The month with most sunshine is July (Average sunshine: 12h).
Months with least sunshine are November and December (Average sunshine: 3).

  • The average UV index in September: 6

Months with the highest UV index are June and July (UV index 9).
The month with the lowest UV index is December (UV index 1).

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