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
Astoria measures an average high-temperature of a still enjoyable 64.6°F (18.1°C) in September, nearly consistent with the preceding month. September is noted for a mean low-temperature of 51.8°F (11°C).Humidity
In Astoria, the average relative humidity in September is 83%.Rainfall
In Astoria, in September, it is raining for 12.4 days, with typically 1.81" (46mm) of accumulated precipitation. Throughout the year, there are 192.7 rainfall days, and 40.12" (1019mm) of precipitation is accumulated.Snowfall
In Astoria, snow does not fall in April through November.Ocean temperature
In Astoria, the average seawater temperature in September is 55.9°F (13.3°C).Note: Dipping into 55.9°F (13.3°C) below 50°F (10°C) is possible with the right protection; absent that, anticipate cold shock and hampered breathing. Swimming momentarily at 55.4°F (13°C) can be jarring.
Daylight
In Astoria, the average length of the day in September is 12h and 31min.On the first day of the month, sunrise is at 6:36 am and sunset at 7:53 pm. On the last day of September, sunrise is at 7:13 am and sunset at 6:56 pm PDT.
Sunshine
In Astoria, the average sunshine in September is 8.7h.UV index
In September, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the average maximum UV index of 4 translates into the following recommendations:
Be cautious. Those with fair skin can be subjected to burns in fewer than 30 minutes. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average September temperature in Astoria?
What is the average humidity in September?
How many days does it rain in September?
When it does not snow?
What is the water temperature in September?
What is the average length of the day in September?
What time are sunrise and sunset in September?
How many hours of sunshine does Astoria have in September?
What is the UV index intensity in September?
Average temperature in September
Astoria, OR
- Average high temperature in September: 64.6°F
The warmest month (with the highest average high temperature) is August (67.6°F).
The month with the lowest average high temperature is December (45.1°F).
- Average low temperature in September: 51.8°F
The month with the highest average low temperature is August (53.1°F).
The coldest month (with the lowest average low temperature) is December (38.5°F).
Average pressure in September
Astoria, 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
Astoria, OR
- Average wind speed in September: 6mph
The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in September
Astoria, OR
- Average humidity in September: 83%
The months with the highest relative humidity are January, February, March, November and December (84%).
The month with the lowest relative humidity is May (81%).
Average rainfall in September
Astoria, OR
- Average rainfall in September: 1.81"
The wettest month (with the highest rainfall) is December (6.42").
The driest month (with the least rainfall) is July (0.51").
Average rainfall days in September
Astoria, OR
- Average rainfall days in September: 12.4 days
The month with the highest number of rainy days is December (21.2 days).
The month with the least rainy days is August (7.2 days).
Average snowfall in September
Astoria, OR
- Average snowfall in September: 0"
The month with the highest snowfall is February (0.91").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in September
Astoria, OR
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (1.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in September
Astoria, OR
- Average sea temperature in September: 55.9°F
The best month for swimming (with the highest average sea temperature) is July (56.9°F).
The coldest month (with the lowest average sea temperature) is February (47.7°F).
Average daylight in September /
Average sunshine in September
Astoria, 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 4min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The months with the least sunshine are January and February (Average sunshine: 3h and 48min).
Average sunshine days in September
Astoria, OR
- Average sunshine days in September: 15.3 days
The month with the most sunshine days is August (20.1 days).
The month with the least sunshine days is February (7.5 days).
Average UV index in September
Astoria, OR
- Average UV index in September: 4
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Astoria, OR
- Average cloud cover in September: 38
The months with the most cloud cover are January and February (Cloud cover 60).
The month with the least cloud cover is August (Cloud cover 36).
Average visibility in September
Astoria, OR
- Average visibility in September: 5mi
The months with the highest visibility are January, February, March, April, May, June, October, November and December (6mi).
The months with the lowest visibility are July, August and September (5mi).
Astoria, Oregon, USA
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