September weather forecastCannon Beach, OR
September
Weather in September
Cannon Beach's September continues the summer feel. While rainfall returns, it remains relatively low compared to the city's yearly average. The number of rainy days starts to creep up, signalling the summer's end and autumn's approach. Warmer sea temperatures persist, but diminishing daylight hours and lesser sunshine reaffirm the imminent change of season. Winds reinforce this shift, with gusts increasing slightly to 11.9mph (19.2km/h) average.Temperature
Cannon Beach marks the onset of September with an average high-temperature of a still refreshing 63.5°F (17.5°C), a subtle shift from August's 65.5°F (18.6°C). The mean low-temperature during September nights is a fresh 53.8°F (12.1°C).Humidity
In Cannon Beach, the average relative humidity in September is 82%.Rainfall
In Cannon Beach, in September, it is raining for 11 days, with typically 1.77" (45mm) of accumulated precipitation. In Cannon Beach, during the entire year, the rain falls for 185.6 days and collects up to 39.8" (1011mm) of precipitation.Snowfall
In Cannon Beach, Oregon, snow does not fall in April through November.Ocean temperature
In Cannon Beach, the average seawater temperature in September is 56.1°F (13.4°C).Note: Immersing oneself in 56.1°F (13.4°C) at sub14°F (-10°C) temperatures is a recipe for harsh cold shock and quickened breathing unless adequately equipped.
Daylight
In September, the average length of the day is 12h and 31min.On the first day of the month, sunrise is at 6:37 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:14 am and sunset at 6:57 pm PDT.
Sunshine
The average sunshine in September is 8.8h.UV index
The months with the highest UV index are May through September, with an average maximum UV index of 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum daily UV index of 4 in September converts into the following recommendations:
Act with care - The suggestion to avoid sunburn is emphasized. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Enhance your sun protection with tightly woven, yet airy clothing.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Cannon Beach, OR
- Average high temperature in September: 63.5°F
The warmest month (with the highest average high temperature) is August (65.5°F).
The month with the lowest average high temperature is December (46.6°F).
- Average low temperature in September: 53.8°F
The month with the highest average low temperature is August (55°F).
The coldest month (with the lowest average low temperature) is December (40.5°F).
Average pressure in September
Cannon Beach, OR
- Average pressure in September: 30.02"Hg
The month with the highest atmospheric pressure is January (30.08"Hg).
The months with the lowest atmospheric pressure are March and September (30.02"Hg).
Average wind speed in September
Cannon Beach, OR
- Average wind speed in September: 7.2mph
The windiest month (with the highest average wind speed) is January (10.9mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in September
Cannon Beach, OR
- Average humidity in September: 82%
The month with the highest relative humidity is August (84%).
The months with the lowest relative humidity are January, March, April, May, October and December (81%).
Average rainfall in September
Cannon Beach, OR
- Average rainfall in September: 1.77"
The wettest month (with the highest rainfall) is December (6.54").
The driest months (with the least rainfall) are July and August (0.47").
Average rainfall days in September
Cannon Beach, OR
- Average rainfall days in September: 11 days
The month with the highest number of rainy days is March (20.8 days).
The months with the least rainy days are July and August (7.3 days).
Average snowfall in September
Cannon Beach, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.59").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Cannon Beach, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.3 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Cannon Beach, OR
- Average sea temperature in September: 56.2°F
The best month for swimming (with the highest average sea temperature) is July (57.2°F).
The coldest month (with the lowest average sea temperature) is February (48.1°F).
Average daylight in September /
Average sunshine in September
Cannon Beach, OR
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in September: 8h and 48min
The month with the most sunshine is August (Average sunshine: 10h and 0min).
The months with the least sunshine are January and February (Average sunshine: 3h and 54min).
Average sunshine days in September
Cannon Beach, OR
- Average sunshine days in September: 17 days
The month with the most sunshine days is August (21.2 days).
The month with the least sunshine days is February (7.5 days).
Average UV index in September
Cannon Beach, OR
- Average UV index in September: 4
The months with the highest UV index are May, June, July, August and September (UV index 4).
The months with the lowest UV index are February, November and December (UV index 2).
Average cloud cover in September
Cannon Beach, OR
- Average cloud cover in September: 36
The months with the most cloud cover are January and February (Cloud cover 59).
The month with the least cloud cover is August (Cloud cover 35).
Average visibility in September
Cannon Beach, OR
- Average visibility in September: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, September, October, November and December (6mi).
The month with the lowest visibility is August (5mi).
