Friday Harbor Weather in September

September in Friday Harbor brings pleasant temperatures, with highs of 18°C (64°F) and nights dropping to 9°C (48°F). Expect some rainfall, with around 41 mm (1.6 in) typical for the month.

Rainfall in Friday Harbor in September

Historically, the month has about 10 days of rain, averaging 41 mm (1.6 in) in total. The rainfall pattern this month is fairly balanced. Showers tend to be moderate rather than extreme.

Temperature in Friday Harbor in September

In September, expect pleasant temperatures in Friday Harbor, with highs of 18°C (64°F) and lows of 9°C (48°F) at night. September marks the summer season. Temperatures can feel cooler in the morning and evening, so layering is often the best approach. With lows around 9°C (48°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.

Sunshine in Friday Harbor in September

Expect sunny days throughout the month, with an estimated 202 hours of sunshine. This makes it a pleasant time to visit Friday Harbor.

If your ideal day consists of dry skies and pleasant temperatures, June, July and August typically offer the best circumstances for Friday Harbor.

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Friday Harbor's climate page.

Friday Harbor Temperature in September

Min Temperature 9°C (48°F)  

Max Temperature 18°C (64°F)  

Chance of Rain 35%  

Precipitation 41 mm (1.6 in)  

Rainy days 10 days  

Sunshine 202 hours  

Percentage Sunshine 55%  

What to Wear in Friday Harbor in September

For Friday Harbor in September, you'll want flexible clothing. It's wise to pack cotton shirts, comfortable shorts, and a pair of jeans for cooler evenings. A light sweater or jacket is useful for air-conditioned spaces (like buses) or unexpected cool moments. Rain is likely on several days, so bring a good rain jacket. Don't forget sun protection, sunglasses, sunscreen, and a hat. These are all good ideas with this much sunshine.

What To Do in Friday Harbor in September

We rated the following activities from 1 (least suitable) to 10 (best) to do.

Cycling

10/10

Walking

10/10

Camping

5/10

Outdoor sports

10/10

Select a Month

Check the conditions for any month of the year.

• January
• February
• March
• April

• May
• June
• July
• August

• September
• October
• November
• December

For a detailed overview over the year and the best time to visit the United States of America, check out our Friday Harbor's climate page.

More climate data for Friday Harbor

Temperature Rainfall Sunshine

See the full Friday Harbor climate overview or explore weather in the United States of America.