July weather forecast
Roslyn, WA

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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.

Frequently asked questions

What is the temperature in July?

Roslyn in July has an average high-temperature of 74.8°F (23.8°C) and an average low-temperature of 47.5°F (8.6°C).

What are the least humid months?

July and August, with an average relative humidity of 60%, are the least humid months.

What is the average humidity in July?

In July, the average relative humidity is 60%.

What is the driest month?

The month with the least rainfall is July, when the rain falls for 7 days and typically collects 0.39" (10mm) of precipitation.

How many days does it rain in July?

In Roslyn, during July, the rain falls for 7 days and regularly aggregates up to 0.39" (10mm) of precipitation.

When it does not snow?

June through August are months without snowfall.

How many hours of daylight does Roslyn have in July?

The average day length in July is 15h and 28min.

When is the sunrise / sunset in July?

On the first day of July in Roslyn, sunrise is at 5:12 am and sunset at 9:03 pm. On the last day of the month, sunrise is at 5:42 am and sunset at 8:38 pm PDT.

How many hours of sunshine does Roslyn have in July?

The average sunshine duration in July is 11.8h.

When is the highest UV index?

July is the month with the highest UV index, with an average maximum UV index of 5.

How high is the UV index in July?

The average daily maximum UV index in July is 5. A UV Index reading of 3 to 5 represents a medium health risk from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in July
Roslyn, WA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in July - Roslyn, 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 36min).

  • Average sunshine in July: 11h and 5min

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 - 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 - 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 - 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 - 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).

Roslyn, Washington, USA

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