Sea Temperature in Seattle in May

Complete information on the sea temperature range in the Salish Sea in Seattle in May. Historical daily data. Climate details for May. Tips on swimming conditions and beach relaxation in Seattle. We find every spot where you can swim and tell you what the water temperature is there today and throughout the year.

Water Temperature Range in Seattle in May

46°F

MINIMUN

53°F

AVERAGE

59°F

MAXIMUM

Historical Data of Water Temperature in May in Seattle

Water Temperature Chart for Salish Sea in Seattle in May

Sea Temperature Table in Seattle in May Over the Past Years

Day	2024	2023	2022	Average
May 1	50°C	50°C	48°C	50°C
May 2	50°C	50°C	48°C	50°C
May 3	52°C	52°C	48°C	51°C
May 4	52°C	50°C	48°C	50°C
May 5	52°C	52°C	50°C	51°C
May 6	52°C	52°C	50°C	51°C
May 7	52°C	50°C	50°C	51°C
May 8	52°C	52°C	50°C	51°C
May 9	52°C	52°C	50°C	51°C
May 10	52°C	52°C	52°C	51°C
May 11	52°C	54°C	52°C	52°C
May 12	50°C	54°C	52°C	51°C
May 13	52°C	52°C	52°C	51°C
May 14	52°C	52°C	52°C	51°C
May 15	52°C	52°C	54°C	52°C
May 16	50°C	54°C	54°C	52°C
May 17	50°C	54°C	54°C	52°C
May 18	50°C	54°C	54°C	52°C
May 19	50°C	54°C	54°C	52°C
May 20	50°C	54°C	55°C	52°C
May 21	50°C	55°C	55°C	52°C
May 22	50°C	54°C	55°C	52°C
May 23	50°C	54°C	55°C	52°C
May 24	50°C	54°C	55°C	52°C
May 25	52°C	54°C	57°C	53°C
May 26	50°C	55°C	57°C	53°C
May 27	52°C	54°C	57°C	53°C
May 28	52°C	54°C	57°C	53°C
May 29	52°C	54°C	57°C	53°C
May 30	52°C	54°C	59°C	53°C

Seattle Climate and Swimming Opportunities in May

64°F

Average Day Air Temperature

46°F

Average Night Air Temperature

2 in

Precipitation Amount per Month

11 days

Number of Rainy Days

15 hrs

Daylight
per Day

8 hrs

Sunshine
per Day

7 mph

Average Wind Speed

70%

Average
humidity

Seattle lies within the Washington in United States. The average daytime temperature in Seattle in May is 65°F (18°C), while the nighttime average is 46°F (8°C). There are typically 11 rainy days during the month, with a total precipitation of 2.0 inches (50 mm). The daylight duration in May in Seattle is 15 hours, with an average of 8 hours of sunshine per day. The average wind speed in May is 7 mph (12 km/h), and the humidity level is around 70%.

The water temperature in Seattle in May ranges from 48°F to 52°F (9°C to 11°C). At the beginning of the month, the average temperature is around 50°F (10°C), shifting to 52°F (11°C) by mid-May and reaching 52°F (11°C) in the last ten days. Overall, the average sea temperature in Seattle for May is 52°F (11°C). Ideal conditions for a refreshing swim, though some may still find it a bit cool.

Sea Temperature in May in Nearby Cities

Frequently Asked Questions About Water Temperatures in May in Seattle

What is the sea temperature in Seattle in May?

The water temperature in the Salish Sea in Seattle in May ranges from 48°F to 52°F (9°C to 11°C).

Is it possible to swim in the Salish Sea in Seattle in May?

The average sea temperature in Seattle in May is 52°F (11°C), and the air temperature is 65°F (18°C), so ideal conditions for a refreshing swim, though some may still find it a bit cool.