April weather forecast
Sammamish, WA

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Dense pine tree cover and houses in the town of Sammamish, Washington, in the Pine Lake area
Dense pine tree cover and houses in the town of Sammamish, Washington, in the Pine Lake area

Weather in April

As the community transitions from winter to spring, April showcases moderate increase in temperatures as compared to March. The city witnesses no snowfall during this month, signalling the complete retreat of winter. Humidity makes a noticeable dip to 80% from the beginning of the year, marking a decrease in moisture levels in the atmosphere. Climatic conditions of April align well with outdoor activities owing to increased sunshine hours. Furthermore, the rise in UV index to 3 adds a layer of vibrancy and warmth to the city's atmosphere.

Temperature

The commencement of April sees a minor shift in the average high-temperature, moving from a cool 50°F (10°C) in March to a mild 55.8°F (13.2°C). Sammamish sees an average low-temperature of 38.8°F (3.8°C) during April.

Humidity

In Sammamish, the average relative humidity in April is 80%.

Rainfall

In Sammamish, in April, it is raining for 14 days, with typically 1.22" (31mm) of accumulated precipitation. In Sammamish, during the entire year, the rain falls for 136.7 days and collects up to 13.39" (340mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. April is the last month it regularly snows. During 0.4 snowfall days, in April, Sammamish aggregates 0.12" (3mm) of snow. Throughout the year, there are 9.3 snowfall days, and 3.27" (83mm) of snow is accumulated.

Daylight

The average length of the day in April is 13h and 41min.
On the first day of April, sunrise is at 6:44 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 5:50 am and sunset at 8:19 pm PDT.

Sunshine

In April, the average sunshine is 7.9h.

UV index

In April, the average daily maximum UV index in Sammamish is 3. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the ordinary person.
Note: A maximum high UV index of 3 in April translates into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Updated: Aug 31, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average April temperature?

In Sammamish, 55.8°F (13.2°C) is the average high-temperature and 38.8°F (3.8°C) is the average low-temperature during April.

What is the average humidity in April?

The average relative humidity in April is 80%.

How much does it rain in April?

In Sammamish, in April, it is raining for 14 days, with typically 1.22" (31mm) of accumulated precipitation.

What is the last month it snows?

April is the last month it regularly snows. During 0.4 snowfall days, in April, Sammamish aggregates 0.12" (3mm) of snow.

What is the average length of the day in April?

The average day length in April is 13h and 41min.

When is the sunrise / sunset in April?

In April, on the first day of the month, sunrise is at 6:44 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 5:50 am and sunset at 8:19 pm PDT.

How long on average sun shines in April?

The average sunshine duration in April is 7.9h.

How high is the UV index in April?

The average daily maximum UV index in April in Sammamish is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability from exposure to the Sun's UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in April
Sammamish, WA

Average temperature in April - Sammamish, WA
  • Average high temperature in April: 55.8°F

The warmest month (with the highest average high temperature) is August (76.5°F).
The month with the lowest average high temperature is December (42.3°F).

  • Average low temperature in April: 38.8°F

The month with the highest average low temperature is August (52.2°F).
The coldest month (with the lowest average low temperature) is December (33.6°F).

Average pressure in April
Sammamish, WA

Average pressure in April - Sammamish, WA
  • Average pressure in April: 30.04"Hg

The month with the highest atmospheric pressure is January (30.1"Hg).
The month with the lowest atmospheric pressure is August (30"Hg).

Average wind speed in April
Sammamish, WA

Average wind speed in April - Sammamish, WA
  • Average wind speed in April: 4.3mph

The windiest month (with the highest average wind speed) is January (5mph).
The calmest month (with the lowest average wind speed) is August (3.4mph).

Average humidity in April
Sammamish, WA

Average humidity in April - Sammamish, WA
  • Average humidity in April: 80%

The months with the highest relative humidity are January, February and December (85%).
The month with the lowest relative humidity is July (70%).

Average rainfall in April
Sammamish, WA

Average rainfall in April - Sammamish, WA
  • Average rainfall in April: 1.22"

The wettest month (with the highest rainfall) is December (1.85").
The driest months (with the least rainfall) are July and August (0.35").

Average rainfall days in April
Sammamish, WA

Average rainfall days in April - Sammamish, WA
  • Average rainfall days in April: 14 days

The month with the highest number of rainy days is March (14.8 days).
The month with the least rainy days is August (5.2 days).

Average snowfall in April
Sammamish, WA

Average snowfall in April - Sammamish, WA
  • Average snowfall in April: 0.12"

The month with the highest snowfall is February (1.38").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in April
Sammamish, WA

Average snowfall days in April - Sammamish, WA
  • Average snowfall days in April: 0.4 days

The month with the highest number of snowfall days is February (3.2 days).
The months with the least snowfall days are May, June, July, August and October (0 days).

Average daylight in April /
Average sunshine in April
Sammamish, WA

Average daylight in April / Average sunshine in April - Sammamish, WA
  • Average daylight in April: 13h and 4min

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 30min).

  • Average sunshine in April: 7h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 42min).
The months with the least sunshine are January and December (Average sunshine: 4h and 12min).

Average sunshine days in April
Sammamish, WA

Average sunshine days in April - Sammamish, WA
  • Average sunshine days in April: 13.9 days

The month with the most sunshine days is August (24 days).
The month with the least sunshine days is November (13.5 days).

Average UV index in April
Sammamish, WA

Average UV index in April - Sammamish, WA
  • Average UV index in April: 3

The months with the highest UV index are June and July (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in April
Sammamish, WA

Average cloud cover in April - Sammamish, WA
  • Average cloud cover in April: 52

The month with the most cloud cover is December (Cloud cover 57).
The month with the least cloud cover is August (Cloud cover 26).

Average visibility in April
Sammamish, WA

Average visibility in April - Sammamish, WA
  • Average visibility in April: 5mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March, April, May, October, November and December (5mi).

Sammamish, Washington, USA

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