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
A mild drop in Navy Yard City's average high-temperature is observed in September, transitioning from a warm 77.2°F (25.1°C) in August to a pleasant 70°F (21.1°C). In Navy Yard City, September is marked by an average low-temperature of 50.9°F (10.5°C).Humidity
In Navy Yard City, the average relative humidity in September is 75%.Rainfall
In Navy Yard City, during September, the rain falls for 9.9 days and regularly aggregates up to 0.59" (15mm) of precipitation. Throughout the year, in Navy Yard City, there are 138.9 rainfall days, and 12.24" (311mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall in Navy Yard City.Ocean temperature
The months with the warmest seawater are August and September, with an average ocean temperature of 53.2°F (11.8°C).Note: You can swim in 53.2°F (11.8°C) below 50°F (10°C) with proper thermal wear; failing that, the cold shock and respiratory challenges are nearly certain. A short span at 55.4°F (13°C) without it is tough.
Daylight
The average length of the day in September in Navy Yard City is 12h and 33min.On the first day of the month, sunrise is at 6:30 am and sunset at 7:50 pm. On the last day of September, sunrise is at 7:09 am and sunset at 6:51 pm PDT.
Sunshine
The average sunshine in September is 9.3h.UV index
In September, the average daily maximum UV index in Navy Yard City, Washington, is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for average individuals.Note: The maximum UV index of 4 during September translates into these guidelines:
Make use of precautions - Suggestions to resist sunburn are communicated. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly.
Frequently asked questions
What is the usual temperature for Navy Yard City in September?
What is the average humidity in September in Navy Yard City?
How much does it rain in Navy Yard City in September?
When it does not snow in Navy Yard City?
What are the months with the warmest ocean in Navy Yard City?
How cold is the water in September in Navy Yard City?
What is the average length of the day in September in Navy Yard City?
What time are sunrise and sunset in September in Navy Yard City?
How long on average sun shines in September in Navy Yard City?
What is the UV index reading in September in Navy Yard City?
Average temperature in September
Navy Yard City, WA
- Average high temperature in September: 70°F
The warmest month (with the highest average high temperature) is August (77.2°F).
The month with the lowest average high temperature is December (43.2°F).
- Average low temperature in September: 50.9°F
The month with the highest average low temperature is August (53.6°F).
The coldest month (with the lowest average low temperature) is December (34.9°F).
Average pressure in September
Navy Yard City, WA
- Average pressure in September: 30.01"Hg
The month with the highest atmospheric pressure is January (30.09"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).
Average wind speed in September
Navy Yard City, WA
- Average wind speed in September: 4.1mph
The windiest month (with the highest average wind speed) is March (5.5mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).
Average humidity in September
Navy Yard City, WA
- Average humidity in September: 75%
The month with the highest relative humidity is December (87%).
The month with the lowest relative humidity is July (69%).
Average rainfall in September
Navy Yard City, WA
- Average rainfall in September: 0.59"
The wettest months (with the highest rainfall) are January and December (2.05").
The driest month (with the least rainfall) is July (0.28").
Average rainfall days in September
Navy Yard City, WA
- Average rainfall days in September: 9.9 days
The month with the highest number of rainy days is March (15.3 days).
The month with the least rainy days is August (5.4 days).
Average snowfall in September
Navy Yard City, WA
- Average snowfall in September: 0"
The month with the highest snowfall is February (1.22").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in September
Navy Yard City, WA
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average sea temperature in September
Navy Yard City, WA
- Average sea temperature in September: 53.1°F
The best month for swimming (with the highest average sea temperature) is August (53.2°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).
Average daylight in September /
Average sunshine in September
Navy Yard City, WA
- Average daylight in September: 12h and 3min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in September: 9h and 2min
The month with the most sunshine is August (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 4h and 6min).
Average sunshine days in September
Navy Yard City, WA
- Average sunshine days in September: 18.5 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (11.8 days).
Average UV index in September
Navy Yard City, WA
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in September
Navy Yard City, WA
- Average cloud cover in September: 34
The month with the most cloud cover is December (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 25).
Average visibility in September
Navy Yard City, WA
- Average visibility in September: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, October, November and December (5mi).
Navy Yard City, Washington, USA
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