Climate Insights for Sackets Harbor

The climate in Sackets Harbor is cool. The average annual temperature is 9°C and approximately 1450mm of precipitation falls per year. Sackets Harbor receives a notable amount of rainfall throughout the year, including during its driest month. Sackets Harbor is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: July, August, September. The coldest months are January, February, December, when temperatures can drop to -5°C. Sackets Harbor experiences heavy snowfall, typically from January through December.

Temperatures in Sackets Harbor vary considerably across the year, with a 30°C difference between the coldest and warmest months. July is the warmest month, though highs remain moderate at 25°C with a mean of 22°C. The coldest month is January, when overnight lows fall to -5°C and the daily average is -3°C. Daily temperature variation is modest, with an average difference of 5°C between highs and lows. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Sackets Harbor is a fairly wet location, receiving approximately 1450mm of precipitation annually, which averages out to around 121mm per month. The wettest month is October, averaging 189mm of rainfall. December and April also tend to see above-average precipitation. The driest month is September, with just 89mm. That's 100mm 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. Sackets Harbor receives heavy snowfall, accumulating around 223cm annually from January through December. The snowiest month is January, with approximately 61cm. Winter travel should account for significant snow cover.

Sackets Harbor is relatively calm, with an average annual wind speed of 5km/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 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in July, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/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 6km/h in winter, 5km/h in spring, 4km/h in summer, 5km/h in autumn.

It is currently summer in Sackets Harbor, which began on June 21, 2026. Sackets Harbor 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 25°C, while the coldest stretch bottoms out in January near -5°C. Autumn is next, beginning on September 23, 2026 — 74 days from now.

The best time to visit Sackets Harbor is during June and September, when the weather is most comfortable for travellers. During these months, average temperatures hover around 18°C with modest rainfall averaging 94mm per month. By contrast, July can be uncomfortably hot with highs reaching 25°C, while January is the coldest period with lows dropping to -5°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Sackets Harbor 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.