July weather forecastSeattle, WA
July
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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: 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: 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: 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: 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: 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: 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: 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: 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: 15h and 30min
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 36min
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: 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: 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: 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: 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).
