Climate Insights for Sisian

The climate in Sisian is cool. The average annual temperature is 4°C and approximately 956mm of precipitation falls per year. Sisian receives a notable amount of rainfall throughout the year, including during its driest month. Sisian is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, June. The coldest months are January, December, February, when temperatures can drop to -13°C. Sisian experiences heavy snowfall, typically from January through December.

Temperatures in Sisian vary considerably across the year, with a 34°C difference between the coldest and warmest months. August is the warmest month, though highs remain moderate at 21°C with a mean of 15°C. The coldest month is January, when overnight lows fall to -13°C and the daily average is -9°C. On average, daily temperatures fluctuate by about 10°C between overnight lows and afternoon highs. The sharpest temperature change occurs between October and November, with a 7°C shift in average temperatures.

Sisian is a moderately rainy area, receiving approximately 956mm of precipitation annually, which averages out to around 80mm per month. The wettest month is May, averaging 161mm of rainfall. June and March also tend to see above-average precipitation. The driest month is November, with just 42mm. That's 120mm less than May, the wettest month. Precipitation varies noticeably between seasons, with the first half (January to June) of the year generally seeing more rainfall. Sisian receives heavy snowfall, accumulating around 236cm annually from January through December. The snowiest month is March, with approximately 65cm. Winter travel should account for significant snow cover.

Sisian is relatively calm, with an average annual wind speed of 10km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is May, averaging 11km/h, though still comfortable for most outdoor activities. The calmest conditions occur in September, with average winds dropping to 9km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 2km/h between the calmest and windiest months.

It is currently spring in Sisian, which began on March 20, 2026. Sisian 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 August at around 21°C, while the coldest stretch bottoms out in January near -13°C. Summer is next, beginning on June 21, 2026 — 89 days from now.

The best time to visit Sisian is during July and August, when the weather is most comfortable for travellers. During these months, average temperatures hover around 15°C with modest rainfall averaging 68mm per month. By contrast, January can be quite cold with temperatures dropping to -13°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Sisian 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.