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Sea Temperature in Friday Harbor in September
Complete information on the sea temperature range in the Salish Sea in Friday Harbor in September. Historical daily data. Climate details for September. Tips on swimming conditions and beach relaxation in Friday Harbor. 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 Friday Harbor in September
8°C
MINIMUN
11°C
AVERAGE
14°C
MAXIMUM
Historical Data of Water Temperature in September in Friday Harbor
Water Temperature Chart for Salish Sea in Friday Harbor in September
Sea Temperature Table in Friday Harbor in September Over the Past Years
| Day | 2024 | 2023 | 2022 | Average |
|---|---|---|---|---|
| Sep 1 | 13°C | 12°C | 12°C | 12.3°C |
| Sep 2 | 13°C | 13°C | 12°C | 12.5°C |
| Sep 3 | 12°C | 13°C | 13°C | 12.5°C |
| Sep 4 | 12°C | 13°C | 13°C | 12.3°C |
| Sep 5 | 12°C | 13°C | 13°C | 12.5°C |
| Sep 6 | 12°C | 13°C | 13°C | 12.5°C |
| Sep 7 | 12°C | 13°C | 13°C | 12.5°C |
| Sep 8 | 12°C | 13°C | 13°C | 12.8°C |
| Sep 9 | 12°C | 13°C | 13°C | 12.5°C |
| Sep 10 | 12°C | 13°C | 13°C | 12.5°C |
| Sep 11 | 12°C | 13°C | 13°C | 12.5°C |
| Sep 12 | 11°C | 13°C | 13°C | 12.3°C |
| Sep 13 | 12°C | 13°C | 13°C | 12.5°C |
| Sep 14 | 12°C | 13°C | 13°C | 12.3°C |
| Sep 15 | 12°C | 12°C | 13°C | 12.3°C |
| Sep 16 | 12°C | 12°C | 13°C | 12.3°C |
| Sep 17 | 12°C | 12°C | 13°C | 12.0°C |
| Sep 18 | 11°C | 13°C | 13°C | 12.0°C |
| Sep 19 | 12°C | 12°C | 12°C | 11.8°C |
| Sep 20 | 12°C | 12°C | 12°C | 11.8°C |
| Sep 21 | 11°C | 12°C | 12°C | 11.5°C |
| Sep 22 | 11°C | 13°C | 12°C | 11.8°C |
| Sep 23 | 12°C | 12°C | 12°C | 11.8°C |
| Sep 24 | 11°C | 12°C | 12°C | 11.5°C |
| Sep 25 | 11°C | 12°C | 12°C | 11.5°C |
| Sep 26 | 12°C | 12°C | 12°C | 11.5°C |
| Sep 27 | 11°C | 12°C | 12°C | 11.3°C |
| Sep 28 | 11°C | 12°C | 13°C | 11.5°C |
| Sep 29 | 11°C | 12°C | 12°C | 11.3°C |
Friday Harbor Climate and Swimming Opportunities in September
19°C
Average Day Air Temperature
11°C
Average Night Air Temperature
70 mm
Precipitation Amount per Month
10 days
Number of Rainy Days
12 hrs
Daylight
per Day
6 hrs
Sunshine
per Day
9 km/h
Average Wind Speed
80%
Average
humidity
Friday Harbor lies within the Washington in United States. The average daytime temperature in Friday Harbor 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 Friday Harbor 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 Friday Harbor in September ranges from 52°F to 54°F (11°C to 12°C). At the beginning of the month, the average temperature is around 54°F (12°C), shifting to 54°F (12°C) by mid-September and reaching 54°F (12°C) in the last ten days. Overall, the average sea temperature in Friday Harbor for September is 54°F (12°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 Friday Harbor
What is the sea temperature in Friday Harbor in September?
The water temperature in the Salish Sea in Friday Harbor in September ranges from 52°F to 54°F (11°C to 12°C).
Is it possible to swim in the Salish Sea in Friday Harbor in September?
The average sea temperature in Friday Harbor in September is 54°F (12°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.