July Weather in Sumas, United States

Last updated: June 24, 2025

In July, the average temperature in Sumas, United States hovers around 17°C (63°F), with a minimum dipping to 8°C (46°F) and a maximum soaring to 33°C (91°F). Expect some rain, as 44 mm (1.8 in) of precipitation falls over approximately 6 days. You'll also experience a high average humidity level of 85%, adding a touch of muggy warmth to the atmosphere.

July Temperature in Sumas

In July in Sumas, the average temperature is 17°C (63°F), with maximums reaching 33°C (91°F) and minimums dipping as low as 8°C (46°F). This pleasant climate makes it an ideal time for travelers to explore the area's outdoor attractions and enjoy the local culture.

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

The chart illustrates July temperature patterns in Sumas, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Sumas, July typically has an average temperature of 17°C (63°F), with highs reaching up to 33°C (91°F) and lows dropping to around 8°C (46°F).

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

July Precipitation in Sumas

In Sumas in July, the precipitation amount is 44 mm (1.8 in) spread over 6 days.

July Precipitation Trends in Sumas

The chart displays monthly precipitation patterns in Sumas, 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 Sumas, July typically receives around 44 mm (1.8 inches) of precipitation spread over approximately 6 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 Sumas

In Sumas in July humidity is 85%. With an average temperature of 17°C (63°F), this humidity feels like a warm, enveloping blanket that clings to your skin, making outdoor activities a bit stifling and encouraging frequent breaks in shaded areas or air-conditioned spaces for travelers.

July Average Humidity in Sumas

This chart illustrates the average monthly humidity levels in Sumas, 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 Sumas is approximately 85%, 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 Sumas

In Sumas 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 Sumas.

Maximum UV Index Levels in Sumas for July

The chart shows the monthly maximum UV Index (UVI) for Sumas 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 Sumas typically reaches 9, which falls under the very high exposure category.

Data source: Sumas 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 Sumas Compares to Other Months

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

This table compares monthly weather conditions in Sumas, showing how July’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	3°C (37°F)	240 mm (9.4 inches)	87%	low
February Weather	2°C (35°F)	214 mm (8.4 inches)	86%	moderate
March Weather	5°C (41°F)	197 mm (7.8 inches)	88%	moderate
April Weather	8°C (47°F)	162 mm (6.4 inches)	86%	high
May Weather	12°C (54°F)	103 mm (4.0 inches)	82%	high
June Weather	15°C (59°F)	82 mm (3.2 inches)	82%	very high
July Weather	17°C (63°F)	44 mm (1.8 inches)	85%	very high
August Weather	18°C (64°F)	27 mm (1.1 inches)	77%	very high
September Weather	14°C (58°F)	166 mm (6.5 inches)	76%	high
October Weather	9°C (48°F)	229 mm (9.0 inches)	88%	moderate
November Weather	5°C (42°F)	317 mm (12.5 inches)	88%	low
December Weather	2°C (36°F)	269 mm (10.6 inches)	89%	low