Last updated: February 24, 2025
In August, Friday Harbor experiences a mild maritime climate, with average temperatures hovering around 15°C (59°F). The month sees maximum highs of 20°C (69°F) and minimum lows around 12°C (55°F), making it a comfortable period for outdoor activities. Rainfall is relatively light, with a total of 15 mm (0.6 in) spread over just 3 days, contributing to a humidity level of 77%. This blend of temperatures and modest precipitation creates a pleasant environment, perfect for enjoying the natural beauty of the region.
In August, Friday Harbor experiences a pleasantly mild climate, with temperatures showcasing a comfortable range. The month begins with a minimum of 12°C (55°F) and sees an average temperature of 15°C (59°F), peaking at 20°C (69°F). This slight rise from July’s averages reflects the trend towards warmer summer weather, making it a perfect time for outdoor activities and enjoying the stunning natural beauty of the area. As summer gradually transitions into autumn, temperatures remain relatively stable, ensuring that visitors can still savor the charm of this picturesque location before the cooler months arrive.
In August, Friday Harbor experiences a notable decline in precipitation, with only 15 mm (0.6 in) of rain accumulating over just 3 days. This marks a continuation of the dry trend observed throughout the summer months, following July's minimal 16 mm. As the season transitions, the skies tend to be clearer, allowing residents and visitors to enjoy the natural beauty of the area. Comparatively, this light August rainfall serves as a sharp contrast to the wetter months of autumn, highlighting the distinct shift in weather patterns that punctuate the year in Friday Harbor. With this drier climate, August offers a perfect opportunity for outdoor activities, making it a favorite time for many to explore the scenic landscapes before the arrival of the fall rains.
In Friday Harbor, August marks a noticeable shift in humidity levels, experiencing a dip to 77%—the lowest for the year. This decline follows a gradual decrease from the peak months of winter, where humidity consistently hovers around 86% from January to April. As summer unfolds, humidity remains relatively stable in June and July at 83% and 84%, respectively. However, August's drop heralds the onset of drier conditions, paving the way for crisp autumn air. This trend continues into September with a slight decrease to 76%, indicating an overall seasonal transition from humid summer days to the higher moisture levels that characterize the rainy months ahead.
August in Friday Harbor sees a very high UV Index of 8, with a burn time of just 15 minutes for unprotected skin. This trend of elevated UV levels persists from July, underscoring the need for sun safety measures. Following a peak in June and July with an even higher UV Index of 9, August maintains significant sun exposure that demands caution. As summer winds down, the UV Index will gradually decline in September, but for now, residents and visitors are encouraged to take protective steps against UV radiation during these bright, sunny days. For more information, check out the detailed Friday Harbor UV Index.
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In August, Friday Harbor basks in a delightful 351 hours of sunshine, marking the end of the summer season with a warm glow. This peak follows a surging trend from January's mere 87 hours, steadily climbing through the months as spring warms the region. The sunshine hours reach a high of 390 in July, and while August sees a slight dip, it still boasts over 350 hours, ensuring plenty of sunny days for outdoor activities. The gradual decline resumes in September with 265 hours, hinting at the onset of autumn, yet the vibrant summer radiance still lingers in the air. This seasonal trajectory showcases how Friday Harbor transitions from the chilly beginnings of the year to a sun-soaked midsummer paradise, embodying the charm of the Pacific Northwest.
August in Friday Harbor offers a promising likelihood of sunny weather, with a 56% chance of sunshine that month. This marks a slight decrease from the heightened 77% in July, suggesting that while summer's golden rays are still prevalent, there’s a touch of transition as autumn approaches. The months leading up to August, particularly June and July, lay the groundwork for this peak summer experience, as both months boast a higher likelihood of clear skies. Conversely, as September rolls in, the prospects for sunshine dip to 37%, signaling a shift toward the cooler, cloudier months ahead. Overall, August stands out as a sweet spot in the summer season, perfect for enjoying all that Friday Harbor has to offer under the sun.
In August, Friday Harbor enjoys approximately 14 hours of daylight, marking a gentle transition from the long, sun-soaked days of summer. Following June's peak of 16 hours, the daylight duration starts to decrease, as the rhythm of the seasons shifts towards fall. This gradual decline continues into September, when daylight dips to 12 hours, highlighting a gradual fade from the vibrant summer. The progression from April’s 13 hours to August’s 14 hours illustrates not only the peak of summer brightness but also hints at nature's calming retreat as the year approaches its end. As daylight wanes, residents and visitors alike can savor each sunlit hour, a reminder of the seasonal cycles that define life in this picturesque coastal community.
In Friday Harbor, August marks a transition in the wind patterns, with an average wind speed of 4.2 m/s (9 mph), slightly lower than the calm breezes of the preceding summer months. Following a steady decline from the peak winds of 6.4 m/s (14 mph) in February, August's gentle winds invite a moment of tranquility, contrasting with the gustier months on either side. As summer winds down, September continues this trend with a slight drop to 4.0 m/s (9 mph), hinting at the approaching autumn. This gradual easing of wind speeds creates a serene atmosphere, perfect for enjoying the natural beauty of the harbor, where the soft rustle of leaves and gentle lapping of water combine harmoniously.
The weather in Friday Harbor changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of August's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Friday Harbor and find detailed weather information for every month.
August and January present strikingly contrasting weather conditions. In August, temperatures range from a mild 12°C (55°F) to a pleasant maximum of 20°C (69°F), accompanied by relatively low precipitation of 15 mm (0.6 in) over just three days, creating a comfortable atmosphere with a humidity level of 77%. In contrast, January brings much colder temperatures, with a minimum of -3°C (27°F) and an average of 7°C (44°F), peaking at only 11°C (52°F). This winter month experiences significantly higher precipitation, totaling 143 mm (5.6 in) across 16 days, contributing to a higher humidity of 86%. For a detailed view of January weather, check out Friday Harbor weather in January.
August and February showcase strikingly different weather patterns. In August, temperatures range from a mild 12°C (55°F) to a maximum of 20°C (69°F), with relatively low precipitation at just 15 mm (0.6 in) over an average of 3 days. The humidity sits at 77%, creating a comfortable summer atmosphere. In contrast, February brings much cooler temperatures, with lows plummeting to -3°C (27°F) and an average of only 6°C (42°F). This month is significantly wetter, receiving about 126 mm (5.0 in) of precipitation spread over 17 days, and humidity levels rise to 85%. For more detailed insights into February weather, visit Friday Harbor weather in February.
When comparing the weather in August and March, notable differences emerge. August typically offers milder temperatures, ranging from a minimum of 12°C (55°F) to a comfortable maximum of 20°C (69°F), with an average temperature of 15°C (59°F). Precipitation is relatively low during this month, with only 15 mm (0.6 in) falling over three days, accompanied by a humidity level of 77%. In contrast, March experiences much cooler temperatures, with lows of 2°C (35°F), an average of 7°C (45°F), and highs reaching just 12°C (55°F). Additionally, March is significantly wetter, receiving 84 mm (3.3 in) of rain over 14 days, and the humidity is slightly higher at 86%. For more detailed weather insights in March, you can visit Friday Harbor weather in March.
When comparing the weather in August and April, notable differences emerge in temperature and precipitation. August sees milder temperatures, with a minimum of 12°C (55°F) and an average around 15°C (59°F), compared to April's cooler minimum of 4°C (39°F) and average of 9°C (48°F). Precipitation also varies significantly, as August experiences only 15 mm (0.6 in) of rainfall over three days, while April is much wetter, receiving 65 mm (2.6 in) across 13 days. The humidity is slightly lower in August at 77%, compared to a higher 86% in April. For a closer look at weather patterns, check out Friday Harbor weather in April.
In comparing the weather between May and August, it is evident that August features warmer temperatures, with an average of 15°C (59°F) compared to May's cooler average of 11°C (52°F). The maximum temperatures in August reach up to 20°C (69°F), while May only tops out at 18°C (64°F). Although August experiences less precipitation, with only 15 mm (0.6 in) over about 3 days, May is noticeably wetter, receiving 39 mm (1.5 in) across approximately 7 days. Additionally, humidity levels are slightly lower in August at 77%, while May has a higher humidity level of 81%. For those interested in a more detailed look at May's weather, you can visit Friday Harbor weather in May.
When comparing the weather in August and June, we see some notable similarities and differences. Both months share the same maximum temperature of 20°C (69°F), but August tends to be slightly warmer on average with an average temperature of 15°C (59°F) compared to June’s 13°C (55°F). In terms of precipitation, June is considerably wetter, experiencing 32 mm (1.3 in) over six days, while August has only 15 mm (0.6 in) over three days. Additionally, humidity levels are slightly lower in August at 77%, compared to June’s 83%. For a closer look at the weather patterns during this month, you can visit Friday Harbor weather in June.
In comparing the weather patterns of July and August, both months exhibit relatively mild temperatures, with average highs around 20°C (69°F). July tends to be slightly cooler with a minimum temperature of 11°C (52°F), while August shows a marginal increase with a minimum of 12°C (55°F). Precipitation levels are comparable, with July recording 16 mm (0.6 in) and August slightly less at 15 mm (0.6 in), both occurring over three days. However, humidity levels are higher in July at 84%, compared to 77% in August. For more detailed insights, check out the weather specifics for Friday Harbor weather in July.
August weather in Friday Harbor features a milder temperature range, with minimums averaging at 12°C (55°F) and maximums reaching up to 20°C (69°F). The month sees relatively low precipitation levels of 15 mm (0.6 in) over just 3 days and maintains a humidity level of 77%. In contrast, September experiences slightly cooler conditions, with minimum temperatures dropping to 11°C (51°F) and an average of 13°C (57°F). However, precipitation significantly increases to 68 mm (2.7 in), falling over 9 days, while humidity remains comparable at 76%. For more specific insights into September weather patterns, you can visit Friday Harbor weather in September.
August generally offers milder weather compared to October, with temperatures ranging from a minimum of 12°C (55°F) to a maximum of 20°C (69°F). The month sees relatively low precipitation at 15 mm, occurring over just three days, and maintains a humidity level of 77%. In contrast, October experiences a significant drop in temperature, with a minimum of 5°C (41°F) and an average of 11°C (52°F), peaking at 15°C (60°F). This month is much wetter, receiving 128 mm of rainfall over 15 days, and the humidity increases to 88%. For a more detailed look at what to expect, check out Friday Harbor weather in October.
August and November present distinctly different weather patterns. In August, temperatures are milder, with a minimum of 12°C (55°F) and a maximum of 20°C (69°F), accompanied by relatively low precipitation of 15 mm (0.6 in) over just 3 days and a humidity level of 77%. In contrast, November brings cooler conditions, with temperatures ranging from a minimum of 4°C (39°F) to a maximum of 13°C (56°F). This month features a significant increase in rainfall, totaling 194 mm (7.6 in) across 19 days, and a higher humidity level of 87%. The contrast in weather between these two months highlights the transition from the mild, drier days of late summer to the much wetter and cooler atmosphere of autumn. For more specific information, you can view Friday Harbor weather in November.
In August, the weather is relatively mild with temperatures ranging from a minimum of 12°C (55°F) to a maximum of 20°C (69°F), accompanied by low precipitation levels of just 15 mm (0.6 in) over three days and a humidity of 77%. In contrast, December brings a significant drop in temperatures, with lows plunging to -7°C (20°F) and highs reaching only 12°C (54°F). This month experiences much heavier rainfall, accumulating 161 mm (6.3 in) over 18 days, along with increased humidity at 87%. For more details on what to expect, check out Friday Harbor weather in December.
August in Friday Harbor presents a delightful balance of comfortable temperatures and moderate humidity, making it a notable departure from the cooler, wetter months of spring and early summer. With an average temperature of 15°C, August offers a pleasant warmth that invites outdoor activities, though it may not reach the highs of mid-summer. The 15 mm of precipitation over just three days underscores the generally dry nature of this month, enhancing the charm of the waning summer season. This makes it an ideal time to explore the beautiful landscapes and rich wildlife that the San Juan Islands have to offer. To learn more about what to expect year-round, visit Friday Harbor Climate.