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

A minor escalation in the average high-temperature is seen in Seattle with the onset of July, moving from a pleasant 69.1°F (20.6°C) in June to a warm 75.9°F (24.4°C). Seattle observes a noteworthy temperature drop from the daily highs during July nights, with a mean temperature of 52.3°F (11.3°C).

Humidity

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

Rainfall

The months with the least rainfall in Seattle are July and August Rain falls for 4.2 days and accumulates 0.12" (3mm) of rain.

Snowfall

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

Ocean temperature

In Seattle, in July, the average water temperature is 50.9°F (10.5°C).
Note: Unprotected swimming in 50.9°F (10.5°C) is dangerous due to potential cold shock. Especially when temperatures go below 50°F (10°C), leading to hyperventilation.

Daylight

In July, the average length of the day is 15h and 31min.
On the first day of July in Seattle, Washington, 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

In July, the average sunshine is 10.6h.

UV index

With an average maximum UV index of 6, July is the month with the highest UV index in Seattle. A UV Index estimate of 6 to 7 represents a high health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: In July, a regular UV index of 6 translates into these guidelines:
Take precautions against overexposure. Protection against sun damage is needed. Avoid direct Sun exposure and seek shade from 10 a.m. to 4 p.m., the period of highest UV radiation. Remember, however, that not all shade structures offer full protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
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Frequently asked questions

What is the average July temperature in Seattle?

Seattle in July has an average high-temperature of 75.9°F (24.4°C) and an average low-temperature of 52.3°F (11.3°C).

What is the least humid month in Seattle?

With an average relative humidity of 69%, July is the least humid month in Seattle, Washington.

What is the average humidity in July in Seattle?

In July, the average relative humidity in Seattle is 69%.

What is the driest month in Seattle?

The months with the least rainfall in Seattle, Washington, are July and August Rain falls for 4.2 days and accumulates 0.12" (3mm) of rain.

How much does it rain in Seattle 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?

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

What is the water temperature in July in Seattle?

In Seattle, Washington, 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 in Seattle?

In July, the average day length is 15h and 31min.

When is the sunrise / sunset in July in Seattle?

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

How many hours of sunshine does Seattle have in July?

In July, the average sunshine duration is 10.6h.

When is the highest UV index in Seattle?

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

What is the UV index reading in July in Seattle?

In Seattle, the average daily maximum UV index in July is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV radiation.
Today
Tomorrow
Long-term
YearJFMAMJJulyASOND
Jun
July
Aug
Average high temperature
69.1°F 20.6°C
75.9°F 24.4°C
76.3°F 24.6°C
Average low temperature
48.4°F 9.1°C
52.3°F 11.3°C
54°F 12.2°C
Average pressure
30.02" 763mmHg
30.03" 763mmHg
30.01" 762mmHg
Average wind speed
3.9mph 6.3km/h
3.5mph 5.6km/h
3.5mph 5.6km/h
Average max. wind speed
4.3mph 6.9km/h
4mph 6.4km/h
4mph 6.4km/h
Average wind speed gusts
5.7mph 9.2km/h
5mph 8km/h
5.1mph 8.2km/h
Average humidity
73%
69%
70%
Average rainfall
0.24" 6mm
0.12" 3mm
0.12" 3mm
Average rainfall days
5.4
4.2
2.8
Average snowfall
0" 0mm
0" 0mm
0" 0mm
Average snowfall days
0
0
0
Average sea temperature
47.6°F 8.7°C
50.8°F 10.4°C
53.5°F 11.9°C
Average daylight
15h 5min
15h 3min
14h 1min
Average sunshine
9h 2min
10h 4min
10h 4min
Average sunshine days
21.8
25.8
25.9
Average UV index
5
6
4
Average cloud cover
42%
27%
25%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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).

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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).

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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).

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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).

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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).

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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).

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Seattle, Washington, USA

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