Contents
- Weather in July
- Frequently asked questions
- Average temperature in July
- Average pressure in July
- Average wind speed in July
- Average humidity in July
- Average rainfall in July
- Average rainfall days in July
- Average snowfall in July
- Average snowfall days in July
- Average daylight in July
- Average sunshine in July
- Average sunshine days in July
- Average UV index in July
- Average cloud cover in July
- Average visibility in July
Weather in July
Temperature
Entering July, Mercer Island notices a subtle temperature elevation, with the average high-temperature advancing from June's pleasant 69.3°F (20.7°C) to a moderately hot 76.1°F (24.5°C). Mercer Island, amidst the high July temperatures, experiences a substantial shift to an average nighttime low of 51.8°F (11°C).Humidity
July is the least humid month in Mercer Island, with an average relative humidity of 69%.Rainfall
The month with the least rainfall is July, when the rain falls for 5.5 days and typically collects 0.24" (6mm) of precipitation.Snowfall
April through October are months without snowfall in Mercer Island.Daylight
The average length of the day in July in Mercer Island is 15h and 31min.On the first day of the month, sunrise is at 5:15 am and sunset at 9:09 pm. On the last day of July, in Mercer Island, sunrise is at 5:46 am and sunset at 8:44 pm PDT.
Sunshine
The average sunshine in July is 10.6h.UV index
With an average maximum UV index of 6, July is the month with the highest UV index in Mercer Island. A UV Index value of 6 to 7 symbolizes a high health vulnerability from unsafe exposure to UV radiation for the average person.Note: The maximum UV index of 6 during July leads to these instructions:
Use protective steps and abide by sun safety guidelines. Safeguarding against skin and eye harm is necessary. Avoid direct Sun exposure and seek shade between 10 a.m. and 4 p.m., when UV radiation is at its peak, but keep in mind that not all shade structures provide complete protection. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average July temperature in Mercer Island?
What is the least humid month in Mercer Island?
What is the average humidity in July in Mercer Island?
What is the driest month in Mercer Island?
How much does it rain in Mercer Island in July?
When it does not snow in Mercer Island?
What is the average length of the day in July in Mercer Island?
What time are sunrise and sunset in July in Mercer Island?
How many hours of sunshine does Mercer Island have in July?
What is the month with the highest UV index in Mercer Island?
What is the UV index reading in July in Mercer Island?
Average temperature in July
Mercer Island, WA
- Average high temperature in July: 76.1°F
The warmest month (with the highest average high temperature) is August (76.6°F).
The month with the lowest average high temperature is December (42.8°F).
- Average low temperature in July: 51.8°F
The month with the highest average low temperature is August (53.4°F).
The coldest month (with the lowest average low temperature) is February (34.5°F).
Average pressure in July
Mercer Island, WA
- Average pressure in July: 30.03"Hg
The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).
Average wind speed in July
Mercer Island, WA
- Average wind speed in July: 3.5mph
The windiest month (with the highest average wind speed) is March (5.1mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).
Average humidity in July
Mercer Island, 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
Mercer Island, WA
- Average rainfall in July: 0.24"
The wettest month (with the highest rainfall) is December (2.01").
The driest month (with the least rainfall) is July (0.24").
Average rainfall days in July
Mercer Island, WA
- Average rainfall days in July: 5.5 days
The month with the highest number of rainy days is March (13.7 days).
The month with the least rainy days is August (4.1 days).
Average snowfall in July
Mercer Island, WA
- Average snowfall in July: 0"
The month with the highest snowfall is February (1.77").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in July
Mercer Island, WA
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is February (3 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in July /
Average sunshine in July
Mercer Island, 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 12min).
Average sunshine days in July
Mercer Island, WA
- Average sunshine days in July: 24.1 days
The month with the most sunshine days is August (24.9 days).
The month with the least sunshine days is February (13.8 days).
Average UV index in July
Mercer Island, 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
Mercer Island, 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
Mercer Island, WA
- Average visibility in July: 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).
Mercer Island, Washington, USA
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