July weather forecast
Seattle, WA

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Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington

Weather in July

July stands out as the hottest month in Seattle, with temperatures reaching an average high of 75.9°F (24.4°C). Clear skies, along with extended daylight, mean that sunshine is abundant. Low rainfall characterizes this month, making it an ideal period for outdoor activities. Public parks become particularly popular, as locals flock to enjoy picnics and barbecues under the warm summer sun. Boat rides and water activities also take center stage with the allure of cooling sea breezes and stunning vistas of Seattle from the water.

Temperature

July's arrival signals a modest temperature shift, moving from an agreeable 69.1°F (20.6°C) in June to a warm 75.9°F (24.4°C). Despite higher daytime temperatures, nighttime averages fall to a cool 52.3°F (11.3°C) in July.

Humidity

July is the least humid month, with an average relative humidity of 69%.

Rainfall

July and August are months with the least rain when the rain falls for 4.2 days and typically aggregates up to 0.12" (3mm) of rain.

Snowfall

April through October and December are months without snowfall.

Ocean temperature

In July, the average ocean temperature is 50.9°F (10.5°C).
Note: Beware of 50.9°F (10.5°C) waters at 55.4°F (13°C), they're uninviting, and a dip below 50°F (10°C) has risks of breath loss and cold shock, contingent on health.

Daylight

In Seattle, the average length of the day in July is 15h and 31min.
On the first day of July, sunrise is at 5:16 am and sunset at 9:10 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 8:44 pm PDT.

Sunshine

The average sunshine in July is 10.6h.

UV index

July is the month with the highest UV index, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: In July, the average maximum UV index of 6 translates into the following recommendations:
Avert overexposure. Light-skinned people might experience burning in less than 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance.

Frequently asked questions

What is the average July temperature?

In July, the average high-temperature and low-temperature are 75.9°F (24.4°C) and 52.3°F (11.3°C) respectively.

What is the least humid month?

The least humid month is July, with an average relative humidity of 69%.

What is the average humidity in July?

The average relative humidity in July is 69%.

What is the driest month?

July and August are months with the least rain when the rain falls for 4.2 days and typically aggregates up to 0.12" (3mm) of rain.

How much does it rain in July?

In Seattle, in July, during 4.2 rainfall days, 0.12" (3mm) of precipitation is typically accumulated.

When it does not snow?

In Seattle, snow does not fall in April through October and December.

What is the ocean temperature in July in Seattle?

In Seattle, the average seawater temperature in July is 50.9°F (10.5°C). At temperatures below 50°F (10°C), swimming in a suitably protected swimsuit is feasible; otherwise, cold shock and loss of breathing control are imminent. Even a short swim, without thermal protection, at temperatures around 55.4°F (13°C) is not comfortable.

What is the average length of the day in July?

The average day length in July is 15h and 31min.

When is the sunrise / sunset in July?

On the first day of July, sunrise is at 5:16 am and sunset at 9:10 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 8:44 pm PDT.

How long on average sun shines in July?

In July, the average sunshine duration is 10.6h.

When is the highest UV index?

July is the month with the highest UV index in Seattle, Washington, with an average maximum UV index of 6.

What is the UV index reading in July in Seattle?

In July, the average daily maximum UV index is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Seattle, WA

Average temperature in July - Seattle, WA
  • Average high temperature in July: 75.9°F

The warmest month (with the highest average high temperature) is August (76.3°F).
The month with the lowest average high temperature is December (43.7°F).

  • Average low temperature in July: 52.3°F

The month with the highest average low temperature is August (54°F).
The coldest month (with the lowest average low temperature) is December (35.1°F).

Average pressure in July
Seattle, WA

Average pressure in July - Seattle, WA
  • Average pressure in July: 30.03"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The months with the lowest atmospheric pressure are March, August and September (30.01"Hg).

Average wind speed in July
Seattle, WA

Average wind speed in July - Seattle, WA
  • Average wind speed in July: 3.5mph

The windiest month (with the highest average wind speed) is March (5.3mph).
The calmest months (with the lowest average wind speed) are July and August (3.5mph).

Average humidity in July
Seattle, WA

Average humidity in July - Seattle, WA
  • Average humidity in July: 69%

The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is July (69%).

Average rainfall in July
Seattle, WA

Average rainfall in July - Seattle, WA
  • Average rainfall in July: 0.12"

The wettest month (with the highest rainfall) is December (0.87").
The driest months (with the least rainfall) are July and August (0.12").

Average rainfall days in July
Seattle, WA

Average rainfall days in July - Seattle, WA
  • Average rainfall days in July: 4.2 days

The month with the highest number of rainy days is November (9.1 days).
The month with the least rainy days is August (2.8 days).

Average snowfall in July
Seattle, WA

Average snowfall in July - Seattle, WA
  • Average snowfall in July: 0"

The month with the highest snowfall is February (0.71").
The months with the least snowfall are April, May, June, July, August, September, October and December (0").

Average snowfall days in July
Seattle, WA

Average snowfall days in July - Seattle, WA
  • Average snowfall days in July: 0 days

The month with the highest number of snowfall days is February (1.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

Average sea temperature in July
Seattle, WA

Average sea temperature in July - Seattle, WA
  • Average sea temperature in July: 50.8°F

The best month for swimming (with the highest average sea temperature) is August (53.5°F).
The coldest month (with the lowest average sea temperature) is February (45.3°F).

Average daylight in July /
Average sunshine in July
Seattle, WA

Average daylight in July / Average sunshine in July - Seattle, WA
  • Average daylight in July: 15h 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 July: 10h and 4min

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 18min).

Average sunshine days in July
Seattle, WA

Average sunshine days in July - Seattle, WA
  • Average sunshine days in July: 25.8 days

The month with the most sunshine days is August (25.9 days).
The month with the least sunshine days is November (16.8 days).

Average UV index in July
Seattle, WA

Average UV index in July - Seattle, WA
  • Average UV index in July: 6

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 July
Seattle, WA

Average cloud cover in July - Seattle, WA
  • Average cloud cover in July: 27

The month with the most cloud cover is December (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 25).

Average visibility in July
Seattle, WA

Average visibility in July - Seattle, WA
  • Average visibility in July: 6mi

The months with the highest visibility are April, May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, November and December (5mi).

Seattle, Washington, USA

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