Weathermondo.comFriday Harbor climate and temperatures
The climate of Friday Harbor is Mediterranean (Köppen: Csb), with dry, mild summers and cool winters. Monthly temperatures range from a minimum of 8°C in winter (December–February) to a maximum of 24°C in summer (June–August). The average annual temperature is around 16°C.
During the winter months, nighttime temperatures can drop to an average of 2°C, while summer nights average around 11°C.
Climate table of Friday Harbor
The climate table below gives you a clear overview of the climate in Friday Harbor by month, from average temperatures and rainfall to UV levels. This makes it easy to see when the weather best suits your travel plans.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
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| Temp. max (°C) | 14 | 16 | 17 | 19 | 23 | 27 | 30 | 30 | 27 | 23 | 18 | 16 |
| Temp. min (°C) | 6 | 7 | 9 | 11 | 15 | 19 | 22 | 22 | 19 | 15 | 10 | 7 |
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| Rainfall (mm) | 46 | 34 | 46 | 64 | 43 | 23 | 22 | 75 | 77 | 84 | 61 | 25 |
| UV index | 4 | 5 | 6 | 7 | 8 | 8 | 8 | 8 | 6 | 5 | 4 | 4 |
Best time to visit Friday Harbor
The best time to visit Friday Harbor is June, July en August. During this period, temperatures are usually pleasant to warm and there is relatively little rainfall. Between June and August, average high temperatures range roughly from 21°C to 24°C, while rainfall remains limited. For a city trip, round trip, or active holiday, May, June, July, August en September are often more comfortable, as it is warm without the heat becoming too intense. The warmest month is August, with an average daytime temperature of around 24°C. The driest month is July, with about 7 mm of rainfall, while November is usually the wettest month of the year, with approximately 141 mm. Snow is rare here, but may occasionally fall in January, February en December.
Average temperature per month
This chart shows the average daytime (maximum) and nighttime (minimum) temperatures per month in Friday Harbor. The figures are based on climate data from recent years and are presented in degrees Celsius, so you can clearly see the temperature range for each month.
Average rainfall per month
This chart shows the average monthly rainfall in Friday Harbor. The figures are based on long-term climate data and are displayed in millimeters, so you can immediately see which months are drier or wetter.
Average UV index per month
This chart shows the average monthly sun intensity in Friday Harbor. The UV index ranges from 0 (no UV radiation) to 11+ (extreme). A higher UV index means you can burn more quickly, making proper sun protection increasingly important.
Average annual temperature
This chart shows the average annual temperature in Friday Harbor based on data from the past ten years. It allows you to see at a glance how the climate is evolving and whether there are clear warming trends.
Average annual rainfall
This chart shows the average annual rainfall in Friday Harbor over the past ten years. It allows you to see at a glance how much rain falls each year and whether there are clear fluctuations between the years.
Weather experiences in Friday Harbor
The weather in Friday Harbor is rated an average of 4.3 out of 5 stars by 8 visitors. Have you been to Friday Harbor? Share your experience with the weather to help other visitors plan their trip.
Average weather per month
Click on a month below and discover what the weather in Friday Harbor is typically like. For each period, you can instantly see the average temperature, rainfall, wind, and UV index. Thanks to years of historical weather data, you’ll know exactly what to expect during your trip.