April Weather in Sammamish, United States

Last updated: June 24, 2025

In Sammamish, United States, the average temperature in April hovers around 9°C (49°F). Visitors can expect temperature extremes, with lows dipping to -3°C (27°F) and highs reaching up to 27°C (81°F). Rainfall is considerable, averaging 154 mm (6.1 in) over 16 days, while the atmosphere remains quite humid, with an average humidity of 84%.

April Temperature in Sammamish

In April in Sammamish, the average temperature is 9°C (49°F). The maximum can reach 27°C (81°F), while the minimum can be as low as -3°C (27°F). This variation makes it a great time for travelers to experience the unique beauty of Sammamish while enjoying a mix of cool and warm weather.

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

The chart illustrates April 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, April typically has an average temperature of 9°C (49°F), with highs reaching up to 27°C (81°F) and lows dropping to around -3°C (27°F).

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

April Precipitation in Sammamish

In Sammamish in April, the precipitation amount is 154 mm (6.1 in) over a span of 16 days.

April Precipitation Trends in Sammamish

The chart displays monthly precipitation patterns in Sammamish, with values for each month alongside April’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how April’s conditions compare to those of other months. In Sammamish, April typically receives around 154 mm (6.1 inches) of precipitation spread over approximately 16 days.

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

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

April Humidity in Sammamish

In Sammamish in April, humidity is 84%. With an average temperature of 9°C (49°F), this humidity feels like a chilly embrace, making travel uncomfortable as the dampness seeps into your clothes and lingers in the air, leaving you feeling cool yet clammy.

April Average Humidity in Sammamish

This chart illustrates the average monthly humidity levels in Sammamish, with April’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In April, average humidity in Sammamish is approximately 84%, offering insight into how humid the weather typically is during this month.

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

April UV Index in Sammamish

In Sammamish in April, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in Sammamish, you can refer to this Hourly UV Index in Sammamish.

Maximum UV Index Levels in Sammamish for April

The chart shows the monthly maximum UV Index (UVI) for Sammamish in April, 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 April, the maximum UV index in Sammamish typically reaches 6, which falls under the high exposure category.

Data source: Sammamish April 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 April 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 April’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 April’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