Juneau month by month — at a glance
1991–2020 normals, measured at the airport. Hover each month for the summary.
It is worth changing the question here from the start. In most destinations you ask when it does not rain. In Juneau rain falls, on average, 230 days a year: more than six out of every ten days on the calendar. The useful question is not whether it will rain, but which month spreads that rain in the way that suits you best.
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01 A place where sun is the exception
The 1991–2020 normals give an annual total of 1,702 millimetres of precipitation spread across an average of 230 rainy days a year. It is a figure that completely changes how you plan: in most destinations you look for the month with the lowest chance of rain; here you look for the month when it rains least, because rain, it is almost certainly going to rain.
Temperature, by contrast, moves within a moderate range: the mean high goes from 0.6 °C in January to 17.8 °C in July, with no violent extremes thanks to the maritime influence of the Gastineau Channel and the Pacific. The cold is never brutal; the water is almost always present.
The four moments that define the year
89 mm and a 14.2 °C high. The most reasonable combination of mild weather and contained rain.
17.8 °C mean high. Also the cruise peak: downtown streets are busier than at any other time.
232 mm, more than double May's total. In exchange, the Tongass forest turns gold.
1.5 °C high and very few sunlight hours, but also not a single cruise ship in port.
02 May, the month that breaks the pattern
If one month steps outside Juneau's wet pattern, it is May: 89 millimetres of rain, among the lowest of the year, combined with a mean high of 14.2 °C, already clearly springlike. It is the best balance between pleasant temperature and a reduced chance of the day's plan being spoiled by water.
April is drier still in absolute terms (88 mm), but with a mean high of only 9.3 °C it is worth going prepared for cold. If you had to pick a single month for weather reliability without giving up some warmth, May wins clearly.
03 July is warm, wet and crowded all at once
July is the warmest month of the year, with a mean high of 17.8 °C, but the rain also starts to climb: 131 millimetres, almost triple May's total. And it is, on top of that, the month of heaviest cruise traffic, within a season that in 2025 reached nearly 1.7 million passengers over the whole year, with days of up to 16,000 visitors between May and September.
Choosing July means choosing the best temperature of the year in exchange for sharing the historic centre with the largest possible number of people. It is not a bad choice if what you are after is activity and a full tourist offering; it is if you prefer quiet streets.
In Juneau, good weather and a quiet town almost never land in the same month.
04 September: the wettest month is also the most golden
September closes the year with 232 millimetres of rain, the calendar's maximum, followed closely by October with 214. The pattern is the same as along much of the North Pacific coast: late-summer storms load the air with moisture just before winter cools it down for good.
The compensation is real: it is the month of the best autumn colour in the Tongass forest, and the cruise season has already shrunk drastically towards the end of the month, so downtown streets recover much of their local rhythm. It is the same dilemma as in other North Pacific destinations: landscape against comfort.
05 How to choose based on what matters to you
If your priority is minimising rain without giving up pleasant temperatures, May is the answer. If you prefer warmth and do not mind sharing the town with thousands of cruise passengers each day, July. If you are after the quietest possible town and do not mind getting wet, December —entirely outside the cruise season— or September, if you also want to see the forest at its best colour.
The year in one sentence: in Juneau you are not choosing between rain and sun, you are choosing between moderate rain and good temperatures, heavy rain and golden forest, or steady rain and empty streets. All three are valid versions of the same town.
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