July weather forecastRoslyn, WA
July
Weather in July
July in Roslyn, Washington, is a warm summer month, with an average temperature varying between 74.8°F (23.8°C) and 47.5°F (8.6°C).Temperature
July shows a rise in the average high-temperature, moving from June's comfortable 64°F (17.8°C) to a moderately hot 74.8°F (23.8°C). Throughout the month of July, Roslyn observes a dramatic downturn from the daytime peak temperatures, expecting an average low of 47.5°F (8.6°C).Humidity
The months with the lowest humidity are July and August, with an average relative humidity of 60%.Rainfall
July is the month with the least rainfall. Rain falls for 7 days and accumulates 0.39" (10mm) of precipitation.Snowfall
In Roslyn, snow does not fall in June through August.Daylight
The average length of the day in July is 15h and 28min.On the first day of the month, sunrise is at 5:12 am and sunset at 9:03 pm. On the last day of July, sunrise is at 5:42 am and sunset at 8:38 pm PDT.
Sunshine
In Roslyn, the average sunshine in July is 11.8h.UV index
July is the month with the highest UV index, with an average maximum UV index of 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: A daily high UV index of 5 in July leads to these guidelines:
Preventative actions are necessary - Recommendations to ward off sunburn are given. Being exposed to the midday Sun can have harmful effects due to strong UV radiation; always take precautions. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Roslyn, WA
- Average high temperature in July: 74.8°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is December (29.7°F).
- Average low temperature in July: 47.5°F
The month with the highest average low temperature is August (47.8°F).
The coldest month (with the lowest average low temperature) is December (18.3°F).
Average pressure in July
Roslyn, WA
- Average pressure in July: 29.98"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is August (29.96"Hg).
Average wind speed in July
Roslyn, WA
- Average wind speed in July: 6.6mph
The windiest month (with the highest average wind speed) is June (6.7mph).
The calmest month (with the lowest average wind speed) is December (4.2mph).
Average humidity in July
Roslyn, WA
- Average humidity in July: 60%
The months with the highest relative humidity are January and February (92%).
The months with the lowest relative humidity are July and August (60%).
Average rainfall in July
Roslyn, WA
- Average rainfall in July: 0.39"
The wettest month (with the highest rainfall) is January (4.41").
The driest month (with the least rainfall) is July (0.39").
Average rainfall days in July
Roslyn, WA
- Average rainfall days in July: 7 days
The months with the highest number of rainy days are March and April (18.3 days).
The month with the least rainy days is August (5.5 days).
Average snowfall in July
Roslyn, WA
- Average snowfall in July: 0"
The month with the highest snowfall is January (16.3").
The months with the least snowfall are June, July and August (0").
Average snowfall days in July
Roslyn, WA
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is December (15.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in July /
Average sunshine in July
Roslyn, 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 36min).
- Average sunshine in July: 11h and 48min
The month with the most sunshine is August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 24min).
Average sunshine days in July
Roslyn, WA
- Average sunshine days in July: 21.9 days
The month with the most sunshine days is August (22.8 days).
The month with the least sunshine days is February (6.8 days).
Average UV index in July
Roslyn, WA
- Average UV index in July: 5
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).
Average cloud cover in July
Roslyn, WA
- Average cloud cover in July: 18
The month with the most cloud cover is January (Cloud cover 63).
The months with the least cloud cover are July and August (Cloud cover 18).
Average visibility in July
Roslyn, WA
- Average visibility in July: 6mi
The months with the highest visibility are May, June, July, August and September (6mi).
The month with the lowest visibility is January (3mi).
