Weather in Juneau

Planning a trip to Juneau? To ensure your journey is perfect, take a look at the current weather information and detailed forecasts presented below.

The climate in Juneau can be described as cool and humid, typical of coastal Alaska. There is no extreme heat here, and the weather is largely determined by the influence of the ocean, making the climate moderately harsh but without sharp temperature fluctuations. Travellers should be prepared for the fact that even in the warmest months, the air remains fresh and bracing.

The distinct seasons here have their own unique features: winters are frosty but not excessively cold for these latitudes, with average temperatures around -4...-6°C. Summer in Juneau is mild and cool: in July and August, the thermometer rarely rises above +13°C. This is the ideal time for those who prefer active outdoor holidays without exhausting heat.

A characteristic feature of the weather in this region of the United States is the high probability of precipitation throughout the year. There are practically no dry seasons here: the number of days with precipitation (rain or snow) varies from 17 to 24 per month. October usually turns out to be particularly rainy and overcast. When planning a trip, be sure to take care of high-quality waterproof clothing and footwear to comfortably enjoy the local beauty.

The temperature regime in Juneau is distinguished by its restraint and lack of extreme fluctuations, which is characteristic of Alaska's maritime climate. The coldest time of the year is winter, especially January and February, when the average temperature holds at around -6°C, and night frosts reach -8°C. Although it is frosty here, the proximity of the ocean softens the climate, preventing the air from cooling as much as in the central parts of the state, yet steady sub-zero temperatures persist from November to March.

Summer in the city is cool and fresh, without sweltering heat. The peak warming occurs in July and August, when the air warms up to an average of +10°C, and daily highs rarely exceed +13°C. This time of year can be characterized as mild, ideally suited for active outdoor recreation, though tourists should always have warm clothes with them, as even summer days here are quite brisk.

Notably, daily temperature fluctuations in Juneau are minimal. The difference between day and night readings is usually only 3–5 degrees (for example, in July from +8°C at night to +12.8°C during the day). Such stability is linked to high humidity and the influence of the ocean, which work as a natural thermostat. Thanks to this, there are no sharp temperature jumps during the day, making the weather quite predictable, albeit cool.

When planning a trip to Juneau, it is worth preparing in advance for the fact that precipitation here is a frequent and habitual phenomenon at any time of the year. There is no clearly defined dry season in this region: humidity remains constantly high, and the number of days with precipitation varies from 17 to 24 per month. Therefore, a waterproof jacket, an umbrella, and reliable footwear will become mandatory elements of your luggage, regardless of the date of your visit.

The winter months, from November to March, are characterized by sub-zero temperatures, so precipitation falls mainly in the form of snow. December and January are among the wettest months of winter, when more than 20 days with precipitation are recorded. At this time, the city is often covered in snow, creating picturesque but harsh landscapes typical of Alaska.

Summer brings warming, and snow gives way to rain. June can conditionally be called the "driest" month in terms of precipitation volume (only about 5 mm), but even at this time, it rains often — about 20 days a month. Usually, these are not heavy downpours, but prolonged drizzle or light rain that maintains the freshness and greenery of the local nature.

The peak of humidity falls in autumn. October is the rainiest month of the year both in terms of precipitation volume and frequency: rain can fall up to 24 days a month. By November, when the temperature drops below zero again, the rains begin to turn into snow, marking the beginning of the long winter.

The weather in Juneau requires a careful approach to choosing a wardrobe, where the main rule at any time of the year remains the principle of layering. In winter and the shoulder seasons, when the temperature often drops below zero, you will definitely need high-quality thermal underwear, warm woollen sweaters, and a reliable winter jacket or down coat with good wind protection. Do not forget a warm hat, scarf, and gloves, as well as insulated waterproof shoes with non-slip soles for comfortable walks on snowy or icy streets.

Summer in this region is quite cool: even in the warmest months, July and August, the average temperature stays around 10°C. Therefore, instead of light summer outfits, it is better to take fleece jumpers, thick trousers, and a windbreaker. Considering that there are many rainy days here all year round (about 20 days a month), waterproof clothing becomes a necessity. Be sure to pack a high-quality raincoat or a membrane jacket with a hood, as well as comfortable trekking boots that will not get wet during excursions.

In addition to clothing, it is worth taking care of practical accessories. Bring sunglasses and sunscreen, as ultraviolet light can be active even in cloudy weather, especially when reflecting off water or snow. A compact umbrella will come in handy for walks around the city centre, but for trips into nature, it is more convenient to use a raincoat so that your hands remain free. A small backpack will allow you to carry removed layers of clothing if the weather suddenly improves, ensuring your comfort throughout the day.