September weather forecast
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

Weather in September

September marks the onset of the fall season in Crater Lake with a slight 3.3" (84mm) of snowfall recorded. The weather starts to transition, with the temperature beginning to drop from the summer highs. Daylight hours reduce, indicating the approaching winter months. A slight increase in rainfall adds a refreshing change to the atmosphere, enhancing the crisp fall air. The lake area starts transitioning into a symphony of autumn hues, presenting a picturesque view to the visitors.

Temperature

As August transitions into September, Crater Lake sees a gentle drop in the average high-temperature, transitioning from a pleasant 69.6°F (20.9°C) to an enjoyable 63.1°F (17.3°C). Contrary to the day's heat, an average low-temperature of 36.1°F (2.3°C) is recorded during the nights in September in Crater Lake.

Rainfall

In September, the rain falls for 5.8 days. Throughout September, 1.97" (50mm) of precipitation is accumulated. In Crater Lake, during the entire year, the rain falls for 145.9 days and collects up to 66.22" (1682mm) of precipitation.

Snowfall

January through July, September through December are months with snowfall. September is the first month it typically snows in Crater Lake, Oregon. Throughout September, in the average 1 snowfall days, it receives 3.31" (84mm) of snow. Throughout the year, there are 101.3 snowfall days, and 482.48" (12255mm) of snow is accumulated.

Daylight

In Crater Lake, the average length of the day in September is 12h and 28min.
On the first day of September in Crater Lake, Oregon, sunrise is at 6:34 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:50 pm PDT.

Sunshine

The average sunshine in September in Crater Lake, Oregon, is 9h.

UV index

The average daily maximum UV index in September in Crater Lake, Oregon, is 6. A UV Index reading of 6 to 7 represents a high health hazard from exposure to the Sun's UV radiation for the average person.
Note: A maximum high daily UV index of 6 during September translates into the following directions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Minimize exposure to direct sunlight and seek shade from 10 a.m. to 4 p.m., when UV radiation is most intense, but remember that shade structures may not offer complete protection. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be on the lookout! Nearly twofold UV radiation from the Sun can be reflected by snow.
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Frequently asked questions

What is the average September temperature in Crater Lake?

In September, the average high-temperature and low-temperature in Crater Lake, Oregon, are 63.1°F (17.3°C) and 36.1°F (2.3°C) respectively.

How many days does it rain in September in Crater Lake?

In Crater Lake, during September, the rain falls for 5.8 days and regularly aggregates up to 1.97" (50mm) of precipitation.

When does it start to snow in Crater Lake?

September is the first month it typically snows in Crater Lake. Throughout September, in the average 1 snowfall days, it receives 3.31" (84mm) of snow.

What is the average length of the day in September in Crater Lake?

In September, the average day length in Crater Lake, Oregon, is 12h and 28min.

When are sunrise and sunset in September in Crater Lake?

On the first day of September in Crater Lake, sunrise is at 6:34 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 7:05 am and sunset at 6:50 pm PDT.

How many hours of sunshine does Crater Lake have in September?

The average sunshine duration in September in Crater Lake, Oregon, is 9h.

How high is the UV index in September in Crater Lake?

In Crater Lake, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health threat from unsafe exposure to Sun's UV rays.
Average rainfall
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average UV index

Average temperature in September
Crater Lake, OR

Average temperature in September - Crater Lake, OR
  • 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).

  • Average low temperature in September: 36.1°F

The 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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Average rainfall in September
Crater Lake, OR

Average rainfall in September - Crater Lake, OR
  • Average rainfall in September: 2"

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

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Average rainfall days in September
Crater Lake, OR

Average rainfall days in September - Crater Lake, OR
  • 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 least rainy days is July (3.9 days).

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Average snowfall in September
Crater Lake, OR

Average snowfall in September - Crater Lake, OR
  • Average snowfall in September: 3.3"

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

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Average snowfall days in September
Crater Lake, OR

Average snowfall days in September - Crater Lake, OR
  • 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 least snowfall days is August (0 days).

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Average daylight in September /
Average sunshine in September
Crater Lake, OR

Average daylight in September / Average sunshine in September - Crater Lake, OR
  • Average daylight in September: 12h and 3min

The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).

  • Average sunshine in September: 9h

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

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Average UV index in September
Crater Lake, OR

Average UV index in September - Crater Lake, OR
  • Average UV index in September: 6

The 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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Crater Lake, Oregon, USA

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