Sea Temperature in Birch Bay in September

Complete information on the sea temperature range in the Salish Sea in Birch Bay in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Birch Bay. 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 Birch Bay in September

46°F

MINIMUN

54°F

AVERAGE

61°F

MAXIMUM

Historical Data of Water Temperature in September in Birch Bay

Water Temperature Chart for Salish Sea in Birch Bay in September

Sea Temperature Table in Birch Bay in September Over the Past Years

Day	2024	2023	2022	Average
Sep 1	57°C	55°C	54°C	55°C
Sep 2	57°C	55°C	55°C	56°C
Sep 3	57°C	55°C	55°C	56°C
Sep 4	55°C	55°C	55°C	55°C
Sep 5	55°C	55°C	55°C	55°C
Sep 6	57°C	55°C	55°C	56°C
Sep 7	59°C	55°C	55°C	56°C
Sep 8	55°C	55°C	55°C	56°C
Sep 9	57°C	57°C	55°C	56°C
Sep 10	57°C	55°C	55°C	56°C
Sep 11	55°C	55°C	55°C	55°C
Sep 12	57°C	55°C	55°C	56°C
Sep 13	57°C	55°C	55°C	55°C
Sep 14	55°C	55°C	55°C	55°C
Sep 15	55°C	55°C	55°C	55°C
Sep 16	55°C	55°C	55°C	55°C
Sep 17	54°C	54°C	55°C	54°C
Sep 18	55°C	55°C	54°C	55°C
Sep 19	55°C	55°C	54°C	54°C
Sep 20	55°C	54°C	54°C	54°C
Sep 21	55°C	54°C	54°C	54°C
Sep 22	55°C	55°C	54°C	54°C
Sep 23	55°C	54°C	54°C	54°C
Sep 24	55°C	55°C	54°C	55°C
Sep 25	57°C	54°C	54°C	55°C
Sep 26	55°C	55°C	54°C	54°C
Sep 27	55°C	54°C	55°C	54°C
Sep 28	55°C	54°C	55°C	54°C
Sep 29	55°C	54°C	54°C	54°C

Birch Bay Climate and Swimming Opportunities in September

66°F

Average Day Air Temperature

52°F

Average Night Air Temperature

3 in

Precipitation Amount per Month

10 days

Number of Rainy Days

12 hrs

Daylight
per Day

6 hrs

Sunshine
per Day

6 mph

Average Wind Speed

80%

Average
humidity

Birch Bay lies within the Washington in United States. The average daytime temperature in Birch Bay in September is 66°F (19°C), while the nighttime average is 51°F (11°C). There are typically 10 rainy days during the month, with a total precipitation of 2.8 inches (70 mm). The daylight duration in September in Birch Bay is 12 hours, with an average of 6 hours of sunshine per day. The average wind speed in September is 6 mph (9 km/h), and the humidity level is around 80%.

The water temperature in Birch Bay in September ranges from 54°F to 55°F (12°C to 13°C). At the beginning of the month, the average temperature is around 55°F (13°C), shifting to 55°F (13°C) by mid-September and reaching 54°F (12°C) in the last ten days. Overall, the average sea temperature in Birch Bay for September is 55°F (13°C). Ideal conditions for a refreshing swim, though some may still find it a bit cool.

Sea Temperature in September in Nearby Cities

Frequently Asked Questions About Water Temperatures in September in Birch Bay

What is the sea temperature in Birch Bay in September?

The water temperature in the Salish Sea in Birch Bay in September ranges from 54°F to 55°F (12°C to 13°C).

Is it possible to swim in the Salish Sea in Birch Bay in September?

The average sea temperature in Birch Bay in September is 55°F (13°C), and the air temperature is 66°F (19°C), so ideal conditions for a refreshing swim, though some may still find it a bit cool.