September weather forecast
Crater Lake, OR

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

September is characterized by a mild reduction in the average high-temperature, from an agreeable 69.6°F (20.9°C) in August to a comfortable 63.1°F (17.3°C). Contrasted against daytime highs, Crater Lake records an average nighttime low of 36.1°F (2.3°C) in September.

Rainfall

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

Snowfall

Months with snowfall are January through July, September through December. September is the first month it typically snows. Throughout September, in the average 1 snowfall days, it receives 3.31" (84mm) of snow. In Crater Lake, during the entire year, snow falls for 101.3 days and aggregates up to 482.48" (12255mm) of snow.

Daylight

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

Sunshine

In Crater Lake, the average sunshine in September is 9h.

UV index

In Crater Lake, the average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The daily maximum UV index of 6 in September interprets into the following advice:
Resist overexposure. Safeguarding from solar damage is indispensable. Stay in the shade and limit direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is particularly strong. Remember, however, that shade structures may not provide complete protection. Opt for tightly woven and loose clothing to enhance protection from the Sun. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.