Last updated: February 24, 2025
In May, Juneau experiences a vibrant transition into late spring, with temperatures averaging around 7°C (45°F) and peaking at a delightful 21°C (70°F) during the day. However, cool nights can dip as low as -3°C (26°F). This month is characterized by significant precipitation, totaling 174 mm (6.9 in) over approximately 18 days, contributing to the region’s lush greenery. The high humidity level, averaging 90%, amplifies the freshness of the air, creating a typical coastal atmosphere. Overall, May in Juneau offers a mix of temperate weather, picturesque landscapes, and a refreshing maritime climate, inviting both residents and visitors to embrace the beauty of nature.
As May unfolds in Juneau, temperatures begin to reveal a noticeable shift towards warmth, signaling the arrival of spring. With minimums around -3°C (26°F) and averages climbing to 7°C (45°F), the community feels a welcomed transition from winter’s grip. Daytime highs can reach up to 21°C (70°F), a stark contrast to the bitter cold of the earlier months. This growth in warmth is significant, especially when compared to April's maximum of 12°C (55°F). As the days grow longer and sunnier, residents embrace outdoor activities, marking May as a month of rejuvenation and promise before the summer months fully take hold. The progression towards milder weather not only enhances the beauty of the landscape but also revitalizes the spirit of those who call Juneau home.
In Juneau, the month of May showcases a notable precipitation pattern with an average of 174 mm (6.9 in) of rain over 18 days. This amount, while slightly lower than April's total, illustrates the city's wet spring transition. As May unfolds, the frequency of rainy days begins to ramp up, setting the stage for an even wetter June, which averages 189 mm (7.4 in) over 22 days. This trend indicates that as the year progresses into summer, Juneau experiences a sustained increase in both precipitation volume and rainy days, revealing its characteristic maritime climate. Interestingly, while May remains less rainy compared to the peak months of late summer and fall, it still acts as a precursor to the intense precipitation patterns that follow, drawing attention to Juneau's dynamic and ever-changing weather.
In Juneau, United States, humidity levels in May exhibit a notable characteristic as they begin to shift toward the summer highs. Typically resting at around 90%, May's humidity is a precursor to the increasingly damp conditions of June, which sees a dramatic rise to 96% and continues to climb throughout the summer months. The trend reveals that as the year progresses, humidity levels soar to their peak in August, reaching a staggering 108%, creating an atmosphere that is unmistakably wet. This gradual increase underscores Juneau's reputation for a moist maritime climate, where even the late spring heralds the onset of a humid season that persists well into the fall.
In Juneau, the UV Index takes a noticeable leap as spring transitions into summer. After a gradual increase from a low of 1 in January to a moderate 5 in April, May bursts onto the scene with a very high UV Index of 8, resulting in a significantly reduced burn time of just 15 minutes. This trend continues into June, where the UV Index remains at 8, signaling that outdoor enthusiasts should take precautions to protect their skin from harmful UV rays. As summer progresses, July and August see the UV Index reaching its peak at 9, emphasizing the importance of sun safety during these months. For detailed information on UV levels throughout the year, check out Juneau UV Index.
UV Risk Categories
In Juneau, the transformation from a wintry landscape to a sunlit paradise is vividly illustrated by the steady increase in sunshine hours throughout the spring. Starting with a modest 43 hours in January, residents eagerly anticipate the arrival of brighter days. By May, sunshine peaks at 235 hours, breathing life into the lush surroundings and marking a delightful crescendo before summer. This trend is especially striking compared to February’s 125 hours and March’s 179 hours, indicating a clear upward trajectory as days lengthen. Even as the summer months approach, sunshine doesn't fade drastically, with June offering a healthy 201 hours. This satisfying abundance of sunlight not only lifts spirits but also enhances outdoor experiences, making Juneau a radiant destination during these months.
In Juneau, the likelihood of sunny weather shows a distinct pattern as the year progresses. While January and March struggle with only 16% and 17% chances of sun respectively, there’s a notable increase approaching late winter and early spring, peaking at 36% in February and 35% in April. However, the optimism wanes in May, with sunny days dropping to just 13%. The trend appears to recover slightly in June, where the chances increase to 26%, maintaining that level through July before tapering off again in the height of summer. With the cool, overcast conditions often characteristic of Juneau, May is not typically synonymous with sunny weather, urging outdoor enthusiasts to plan accordingly for their adventures.
In Juneau, the daylight duration undergoes a remarkable transformation throughout the year, with significant increases as spring unfolds into summer. Beginning with just 7 hours of daylight in January, the days gradually lengthen, reaching 16 hours by May. By June, residents bask in an impressive 18 hours of daylight, marking the peak of the sun's embrace. This extended daylight not only brightens the vibrant landscape but also revitalizes the spirit of both locals and visitors alike. However, as summer begins to wane, the daylight hours taper off, descending to 17 hours in July and gradually diminishing to 6 hours by year’s end. This cyclical pattern highlights Juneau's unique geographic position, offering a captivating interplay between light and darkness throughout the seasons.
In Juneau, the winds exhibit a distinct ebb and flow throughout the year, reflecting the region's dynamic weather patterns. Beginning in January, the average wind speed is relatively calm at 2.5 m/s (6 mph), sustaining a gentle breeze through February. However, as spring arrives, these winds start to ease, dipping to 2.0 m/s (4 mph) by April and further into 1.8 m/s (4 mph) in May. This trend continues into June, where a slight decrease brings the average to 1.6 m/s (4 mph), marking the calmest period of the year. As summer transitions to autumn, the winds gradually pick up again, reaching 2.2 m/s (5 mph) in September before returning to 2.5 m/s (6 mph) in October. Interestingly, the winds tend to fluctuate more in the cooler months, with a consistent average speed observed from November to December. Overall, Juneau's wind patterns showcase a seasonal rhythm, embodying the region’s playful spirit in nature.
The weather in Juneau changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of May's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Juneau and find detailed weather information for every month.
In May, the weather is considerably milder, with temperatures ranging from a minimum of -3°C (26°F) to a maximum of 21°C (70°F), and an average of 7°C (45°F). The month experiences a total precipitation of 174 mm (6.9 in) spread over roughly 18 days, and the humidity is relatively high at 90%. In stark contrast, January brings much colder conditions, with temperatures dipping as low as -25°C (-13°F) and averaging -4°C (25°F), peaking at just 8°C (47°F). This winter month has a higher total precipitation of 215 mm (8.4 in) across 16 precipitation days, accompanied by increased humidity at 94%. For a detailed look at January conditions, check out Juneau weather in January.
May and February showcase a stark contrast in weather patterns. While February experiences frigid temperatures with a minimum of -24°C (-12°F) and an average of -5°C (23°F), May warms up significantly, with a minimum of -3°C (26°F) and an average of 7°C (45°F). February also has a higher maximum temperature of 9°C (48°F) compared to May’s 21°C (70°F), indicating the transition into spring. In terms of precipitation, May sees slightly less than February, with 174 mm (6.9 in) over 18 days compared to February’s 182 mm (7.2 in) over 14 days. Both months have notably high humidity at 90%. For more detailed information, you can check out Juneau weather in February.
In comparing the weather of May and March, it is evident that May is significantly warmer with average temperatures ranging from -3°C (26°F) to a maximum of 21°C (70°F), while March remains much colder with averages from -18°C (0°F) to a maximum of 10°C (51°F). Both months experience similar levels of precipitation, with May receiving 174 mm (6.9 in) over 18 days and March slightly more at 175 mm (6.9 in) over 17 days. The humidity levels in both months are also high, with May at 90% and March at 92%. For a more detailed look at March weather specifics, you can visit Juneau weather in March.
In May, the weather in Juneau sees a noticeable warming trend compared to April, with minimum temperatures rising from -13°C (9°F) in April to -3°C (26°F) in May, and average temperatures shifting from 2°C (36°F) to 7°C (45°F). The maximum temperature also increases significantly, reaching 21°C (70°F) in May compared to just 12°C (55°F) in April. While precipitation slightly increases from 163 mm (6.4 in) in April to 174 mm (6.9 in) in May, the number of wet days remains comparable, with May experiencing precipitation on 18 days versus 17 days in April. Humidity levels are slightly lower in May at 90% compared to 92% in April, indicating a marginally drier feel. For more information on April weather, check out Juneau weather in April.
May and June present a shift in weather patterns, with June generally being warmer and wetter. In May, temperatures range from a chilly minimum of -3°C (26°F) to a pleasant maximum of 21°C (70°F), with an average of 7°C (45°F). The month experiences significant precipitation, totaling 174 mm (6.9 in) over 18 days, coupled with high humidity levels at 90%. In contrast, June offers milder temperatures starting from a minimum of 2°C (36°F) and peaking at 25°C (77°F), resulting in a higher average of 11°C (53°F). Precipitation also increases slightly to 189 mm (7.4 in) over 22 days, with humidity reaching 96%. For more detailed information, you can check out Juneau weather in June.
In comparing the weather between May and July, notable differences emerge in both temperature and humidity levels. May experiences a broader temperature range, with minimums dipping as low as -3°C (26°F) and average temperatures around 7°C (45°F), while July maintains a milder climate, with minimum temperatures starting at 7°C (45°F) and an average of 13°C (56°F). Precipitation patterns are relatively similar, with both months receiving around 164-174 mm, but humidity levels in July are markedly higher, peaking at 104% compared to May's 90%. This increase in humidity during July may contribute to a heavier, more oppressive feeling in the air, despite the warmer temperatures. For more detailed information, you can check Juneau weather in July.
In comparing the weather of May and August, a distinct shift can be observed. May features cooler temperatures, ranging from a minimum of -3°C (26°F) to a maximum of 21°C (70°F), with an average of 7°C (45°F). It experiences significant rainfall, accumulating 174 mm (6.9 in) over 18 rainy days, while humidity hovers around 90%. In contrast, August brings milder temperatures with a minimum of 4°C (40°F) and a maximum of 27°C (80°F), resulting in a higher average of 13°C (56°F). However, it also faces increased precipitation, totaling 280 mm (11.0 in) across 20 days, and humidity levels rise to 108%. For more detailed insights, you can visit Juneau weather in August.
May and September in Juneau present notable differences in weather patterns. In May, the temperatures range from a chilly -3°C (26°F) to a pleasant 21°C (70°F), with an average of 7°C (45°F). The month experiences significant precipitation, totaling 174 mm (6.9 in) over 18 days, accompanied by high humidity levels at 90%. In contrast, September showcases slightly cooler temperatures, with minima dropping to -4°C (26°F) and maxima reaching 23°C (74°F), resulting in an average of 10°C (50°F). Precipitation increases in September, reaching 259 mm (10.2 in) over 17 days and a remarkable humidity level of 101%. For more information on weather patterns, check out Juneau weather in September.
May and October present contrasting weather patterns, highlighting the transitional nature of spring and fall. In May, temperatures range from a chilly minimum of -3°C (26°F) to a pleasant maximum of 21°C (70°F), with an average of 7°C (45°F). The month experiences moderate precipitation, totaling 174 mm (6.9 in) over 18 days, and a relatively high humidity of 90%. In contrast, October brings significantly cooler temperatures, with a lower minimum of -11°C (13°F) and an average of just 4°C (40°F), peaking at 14°C (57°F). Moreover, October is considerably wetter, receiving 332 mm (13.1 in) of rain across 22 days and a higher humidity level of 98%. For more details on October weather, refer to Juneau weather in October.
May and November present distinctly different weather patterns. In May, temperatures range from a minimum of -3°C (26°F) to a maximum of 21°C (70°F), with an average of 7°C (45°F). The month experiences 18 days of precipitation, totaling 174 mm (6.9 inches), accompanied by relatively lower humidity at 90%. In contrast, November sees much colder conditions, with minimum temperatures dropping to -15°C (6°F) and a maximum of only 8°C (47°F), averaging around -1°C (31°F). This month also experiences more precipitation, totaling 267 mm (10.5 inches) over 22 days and higher humidity levels at 97%. For more detailed information, you can refer to Juneau weather in November.
May and December present stark contrasts in weather conditions. In May, temperatures range from a chilly minimum of -3°C (26°F) to a pleasant maximum of 21°C (70°F), with an average of 7°C (45°F). This month typically sees 174 mm (6.9 in) of precipitation over 18 days and maintains a humidity level of 90%. In contrast, December is significantly colder, with temperatures plummeting to a minimum of -24°C (-10°F) and an average of -2°C (28°F), reaching a maximum of only 10°C (50°F). This month experiences even higher precipitation, totaling 292 mm (11.5 in) over 22 days, and humidity peaks at 96%. The differences in temperature and precipitation between these two months highlight the dramatic seasonal shifts in this region. For more detailed insights, you can refer to Juneau weather in December.
As May unfolds in Juneau, the transition into spring becomes palpable, with temperatures gradually warming and offering a refreshing respite from the chill of winter. While the average temperature hovers around a brisk 7°C (45°F), the occasional peaks at 21°C (70°F) hint at the vibrant summer ahead. However, this month is not without its share of rain, as April showers give way to May's mix of 174 mm of precipitation over 18 days, contributing to the city's lush, green landscape that characterizes this time of year. With a humidity level of 90%, the air is filled with a refreshing moisture that enhances the beauty of the surroundings. For a deeper dive into how May's weather complements the overall climate of Juneau, visit Juneau Climate.