July weather forecast and climate
Seattle, WA

Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
Beautiful dusk skyline over the giant skyscrapers of Seattle, Washington
July is the driest month in Seattle with only five days of rain and the lowest precipitation of 0.9" (22.9mm) as well as the least humid at 64.8%. The sunshine hours are the highest in July, averaging ten. The sea temperature is 57.2°F (14°C). The month records the highest tourist numbers all year.
Temperatures are the most pleasant in the range of 55.4°F (13°C), and 73.4°F (23°C) and touring Seattle becomes most comfortable, especially with sixteen hours of daylight that allow for participation during the summer festivities late into the night.

What is the temperature in July in Seattle?

In July, in Seattle, Washington, the average high-temperature is 75.7°F (24.3°C), and the average low-temperature is 55.6°F (13.1°C).

How many days does it rain in July in Seattle?

In Seattle, in July, during 5 rainfall days, typically, 0.7" (17.8mm) of precipitation is accumulated.

How cold is the water in July in Seattle?

In Seattle, in July, the average water temperature 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.
Average temperature in July - Seattle, WA
  • Average high temperature in July: 75.8°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 (45.7°F).

  • Average low temperature in July: 55.6°F

The month with the highest average low temperature is August (55.9°F).
The coldest month (with the lowest average low temperature) is December (35.6°F).

Average humidity in July - Seattle, WA
  • Average humidity in July: 65.4%

The month with the highest relative humidity is December (80.1%).
The month with the lowest relative humidity is July (65.4%).

Average rainfall in July - Seattle, WA
  • Average rainfall in July: 0.7"

The wettest month (with the highest rainfall) is November (6.6").
The driest month (with the lowest rainfall) is July (0.7").

Average rainfall days in July - Seattle, WA
  • Average rainfall days in July: 5 days

The month with the highest number of rainy days is November (18.4 days).
The month with the lowest number of rainy days is August (4.8 days).

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

Months with the highest snowfall are February and December (1.7").
Months with the lowest snowfall are April, May, June, July, August, September and October (0").

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

The month with the highest number of snowfall days is December (1.6 days).
Months with the lowest number of snowfall days are April, May, June, July, August, September and October (0 days).

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: 15.5h

The month with the longest days is June (Average daylight: 15.9h).
The month with shortest days is December (Average daylight: 8.5h).

  • Average sunshine in July: 10.1h

The month with most sunshine is July (Average sunshine: 10.1h).
The month with least sunshine is December (Average sunshine: 1.7h).

Average UV index in July - Seattle, WA
  • Average UV index in July: 7

Months with the highest UV index are June and July (UV index 7).
Months with the lowest UV index are January, November and December (UV index 1).

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