July Weather in Sammamish, United States

Last updated: June 24, 2025

In Sammamish, United States, the average temperature in July hovers around 18°C (65°F). Temperatures can vary widely, with a minimum of 8°C (48°F) and soaring up to 32°C (90°F). Expect 33 mm (1.3 in) of precipitation spread over 7 days, while the average humidity sits at a comfortable 79%.

July Temperature in Sammamish

In July in Sammamish, the average temperature is 18°C (65°F), with maximums reaching 32°C (90°F) and minimums dropping as low as 8°C (48°F). This makes it an ideal time for outdoor activities and sightseeing, as you can enjoy warm days and cooler evenings.

July Weather in Sammamish: Daily Temperature Highs, Lows, and Averages

The chart illustrates July temperature patterns in Sammamish, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sammamish, July typically has an average temperature of 18°C (65°F), with highs reaching up to 32°C (90°F) and lows dropping to around 8°C (48°F).

Data source: Temperature data for Sammamish generated using information from the Copernicus Climate Change Service.

July Precipitation in Sammamish

In Sammamish in July, the precipitation amount is 33 mm (1.3 in) over a period of 7 days.

July Precipitation Trends in Sammamish

The chart displays monthly precipitation patterns in Sammamish, with values for each month alongside July’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how July’s conditions compare to those of other months. In Sammamish, July typically receives around 33 mm (1.3 inches) of precipitation spread over approximately 7 days.

Data source: Precipitation data for July generated using information from the Copernicus Climate Change Service.

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Millimeters (mm) Inches (in)

July Humidity in Sammamish

In Sammamish in July, humidity is 79%. With an average temperature of 18°C (65°F), this humidity feels like walking through a warm mist, making traveling slightly uncomfortable and sticky, but offering a refreshing escape when you find moments of shade or a breeze.

July Average Humidity in Sammamish

This chart illustrates the average monthly humidity levels in Sammamish, with July’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In July, average humidity in Sammamish is approximately 79%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for July generated using information from the Copernicus Climate Change Service.

July UV Index in Sammamish

In Sammamish in July, the maximum UV index is 9, which corresponds to a very high Exposure Category. The time to burn is just 15 minutes, so it's essential to take precautions. For detailed information, you can check the Hourly UV Index in Sammamish.

Maximum UV Index Levels in Sammamish for July

The chart shows the monthly maximum UV Index (UVI) for Sammamish in July, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In July, the maximum UV index in Sammamish typically reaches 9, which falls under the very high exposure category.

Data source: Sammamish July UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How July Weather in Sammamish Compares to Other Months

Weather in Sammamish varies notably across the year, with each month offering distinct climate conditions. This page compares July’s weather to other months in Sammamish, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Sammamish, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	5°C (41°F)	215 mm (8.5 inches)	86%	low
February Weather	4°C (39°F)	242 mm (9.5 inches)	86%	moderate
March Weather	7°C (44°F)	167 mm (6.6 inches)	87%	moderate
April Weather	9°C (49°F)	154 mm (6.1 inches)	84%	high
May Weather	13°C (56°F)	94 mm (3.7 inches)	81%	very high
June Weather	16°C (60°F)	88 mm (3.5 inches)	82%	very high
July Weather	18°C (65°F)	33 mm (1.3 inches)	79%	very high
August Weather	18°C (65°F)	27 mm (1.0 inches)	63%	very high
September Weather	15°C (60°F)	124 mm (4.9 inches)	62%	high
October Weather	10°C (50°F)	220 mm (8.7 inches)	83%	moderate
November Weather	7°C (45°F)	238 mm (9.4 inches)	89%	low
December Weather	4°C (40°F)	248 mm (9.8 inches)	88%	low