Climate Insights for Juneau

The climate in Juneau is cool. The average annual temperature is 4°C and approximately 2812mm of precipitation falls per year. Juneau receives a notable amount of rainfall throughout the year, including during its driest month. Juneau is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, June. The coldest months are February, December, January, when temperatures can drop to -6°C. Juneau experiences heavy snowfall, typically from January through December.

Temperatures in Juneau vary considerably across the year, with a 23°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 17°C with a mean of 13°C. The coldest month is February, when overnight lows fall to -6°C and the daily average is -4°C. Daily temperature variation is modest, with an average difference of 6°C between highs and lows. The sharpest temperature change occurs between September and October, with a 5°C shift in average temperatures.

Juneau is a very wet location, receiving approximately 2812mm of precipitation annually, which averages out to around 234mm per month. The wettest month is October, averaging 339mm of rainfall. September and January also tend to see above-average precipitation. The driest month is June, with just 158mm. That's 181mm less than October, the wettest month. Rainfall is relatively evenly distributed throughout the year, so there is no pronounced dry or wet season to plan around. Juneau receives heavy snowfall, accumulating around 728cm annually from January through December. The snowiest month is January, with approximately 144cm. Winter travel should account for significant snow cover.

Juneau is relatively calm, with an average annual wind speed of 11km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 12km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 3km/h gap between the calmest and windiest months. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 12km/h in winter, 10km/h in spring, 9km/h in summer, 12km/h in autumn.

It is currently spring in Juneau, which began on March 20, 2026. Juneau is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in July at around 17°C, while the coldest stretch bottoms out in February near -6°C. Summer is next, beginning on June 21, 2026 — 8 days from now.

The table below shows monthly climate averages for Juneau based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Snow is measured in centimetres (cm) and reflects average monthly snowfall accumulation. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.