Contents
- Weather in September
- Frequently asked questions
- Average temperature in September
- Average pressure in September
- Average wind speed in September
- Average humidity in September
- Average rainfall in September
- Average rainfall days in September
- Average snowfall in September
- Average snowfall days in September
- Average sea temperature in September
- Average daylight in September
- Average sunshine in September
- Average sunshine days in September
- Average UV index in September
- Average cloud cover in September
- Average visibility in September
Weather in September
Temperature
The advent of September brings an average high-temperature of a still refreshing 63.5°F (17.5°C), almost identical to the preceding month. In September, Seaside's temperature tends to fall to an average low of 53.8°F (12.1°C) during the night.Humidity
In September, the average relative humidity is 82%.Rainfall
In Seaside, Oregon, in September, during 11 rainfall days, 1.77" (45mm) of precipitation is typically accumulated. In Seaside, during the entire year, the rain falls for 185.6 days and collects up to 39.8" (1011mm) of precipitation.Snowfall
In Seaside, snow does not fall in April through November.Ocean temperature
In September, the average ocean temperature is 56.1°F (13.4°C).Note: Swimming in 56.1°F (13.4°C) is deemed hazardous. Exposure to temperatures below 50°F (10°C) leads to immediate severe cold shock and hyperventilation.
Daylight
In September, the average length of the day in Seaside 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, in Seaside, Oregon, sunrise is at 7:13 am and sunset at 6:56 pm PDT.
Sunshine
The average sunshine in September in Seaside is 8.8h.UV index
May through September, with an average maximum UV index of 4, are months with the highest UV index. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 4 in September leads to these guidelines:
Act with care - The need to guard against sun damage is communicated. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Frequently asked questions
What is the usual temperature for Seaside in September?
What is the average humidity in September in Seaside?
How many days does it rain in September in Seaside?
When it does not snow in Seaside?
What is the water temperature in September in Seaside?
How many hours of daylight does Seaside have in September?
What time are sunrise and sunset in September in Seaside?
How many hours of sunshine does Seaside have in September?
What is the month with the highest UV index in Seaside?
What is the UV index reading in September in Seaside?
Average temperature in September
Seaside, 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
Seaside, 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
Seaside, 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
Seaside, 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
Seaside, 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
Seaside, 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
Seaside, 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
Seaside, 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
Seaside, 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
Seaside, OR
- Average daylight in September: 12h and 3min
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 5min
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
Seaside, 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
Seaside, 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
Seaside, 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
Seaside, 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).
Seaside, Oregon, USA
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