Irkutsk weather and climate in 2025
Day
22 °C
Night
10 °C
Sea
0 °C
Precipitation
87 mm
in month
Rainy days
13 days
in month
Daylight
14 hours
average
Sunshine
7 hours
average
Humidity
73 %
Day
22 °C
Night
10 °C
Sea
0 °C
Precipitation
87 mm
in month
Rainy days
13 days
in month
Daylight
14 hours
average
Sunshine
7 hours
average
Humidity
73 %
Overview: Irkutsk
Weather charts for Irkutsk
Find more destinations like this
Closest destinations for Irkutsk
Closest cities for Irkutsk
Weather overview for Irkutsk
Weather overview
Irkutsk exhibits a subarctic climate, with extremely cold winters and warm summers. Daytime temperatures vary from a bone-chilling average high of -13 °C (8 °F) in January to a pleasant 25 °C (77 °F) in July. Precipitation patterns change with the seasons, peaking in July with an average of 102 mm (4.00 in). Poignant moments under the shy winter sun give way to a lengthier embrace of sunlight in the summer months. A notable highlight is the stark difference in humidity, from the heavy breath of 93 % in December to the relatively drier air in May with 51 % humidity. As the city does not border any ocean, the sea temperatures are not applicable here.
January weather
Irkutsk in January is shrouded in frigid temperatures, with a bitter daytime average high of -13 °C (8 °F) and an even more biting average low at night of -22 °C (-8 °F). January is considered one of the coldest months, with an estimated 5 of snowfall and a modest precipitation rate of 12 mm (0.45 in).
February weather
February in Irkutsk is still held firm in winter's grasp, with an average daytime high of -9 °C (16 °F). At night, temperatures can plummet to an average of -21 °C (-5 °F). With typically 3 of snow and an average wind speed of 2 m/s, the cold can feel quite penetrating.
March weather
As March arrives, Irkutsk begins to witness the slow retreat of winter, with the average daytime high temperature climbing to 0 °C (32 °F). The nights remain frigid, though, with an average low of -13 °C (8 °F). You can notice the increased average sun hours to 7 hours per day but remain cautious as 4 still report snowfall.
April weather
April marks the onset of spring in Irkutsk with a significant rise in daytime temperatures, averaging at 9 °C (49 °F). Nights are still cool though, with an average minimum temperature of -3 °C (27 °F). With 5 witnessing precipitation and a rainfall amount of 16 mm (0.62 in), the landscape begins to thaw.
May weather
Irkutsk welcomes May with the warmth of spring in full sway as daytime temperatures climb to a comfy 18 °C (65 °F). Nights offer a mild chill at 3 °C (38 °F). With increased humidity at 51 % and more sun hours, approximately 9 hours, residents begin to feel the invigorating change.
June weather
June in Irkutsk is characterized by longer days and warmer weather, as the average daytime temperature peaks at 23 °C (73 °F), while nights are comfortably cool at 9 °C (49 °F). Humidity rises to 61 %, and an increase in precipitation can be expected with an average of 71 mm (2.79 in).
July weather
The apex of Irkutsk's summer arrives in July with the highest daytime temperatures of the year, peaking at an average of 25 °C (77 °F). At night, the temperature settles at an agreeable 13 °C (55 °F). With 14 expecting precipitation, it is the wettest month, reaching up to 102 mm (4.00 in).
August weather
As August comes around, Irkutsk's temperatures are still in the comfort range with a daily average high of 22 °C (72 °F). Nights are mildly warm with an average of 10 °C (51 °F). With a humidity level of 73 %NaN mm (NaN in) of rainfall spread across 13, August retains the warmth of summer albeit with frequent showers.
September weather
Irkutsk begins to feel the coming change in September, with decreasing daytime temperatures now averaging 15 °C (60 °F) and cooler nights at 4 °C (38 °F). Expect a contraction in the number of sun hours to 6 hours per day as autumn progresses.
October weather
October sees a further decline in Irkutsk’s climate comfort as the average high temperature drops to 6 °C (44 °F) during the day and a chilly -4 °C (25 °F) at night. The humidity lingers at 70 % and the landscape transforms with the colors of fall.
November weather
The prelude to winter begins in November as Irkutsk’s average daytime temperature falls to a cold -4 °C (25 °F). The night atmosphere is more severe with an expected low of -13 °C (9 °F). Alongside a rise in wind speed to 2 m/s, the early onset of snowy weather is anticipated.
December weather
December in Irkutsk marks the full grip of winter with frigid daytime averages of -11 °C (12 °F) and even colder nights at an average of -19 °C (-3 °F). Snowfall becomes more routine with an estimated 6. The high humidity and short sun hours, about 2 hours per day, contribute to the stark winter atmosphere.
FAQs
How many layers of clothing are essential in Irkutsk during January?
Dressing in multiple layers is absolutely essential in Irkutsk during January, starting with thermal undergarments, followed by several insulating layers, and topped with a windproof and waterproof outer layer.
Does the temperature in Irkutsk in February allow for outdoor activities?
Outdoor activities in Irkutsk during February are possible, but you'll need to dress warmly to cope with the average high of -9 °C (16 °F) and prepare for potential wind chill.
When does the snow start to melt in Irkutsk?
Snow begins to melt in Irkutsk as temperatures rise in March, but with still about 4 of snowfall, complete melting takes a while.
Is April considered a wet month in Irkutsk?
April sees a moderate amount of precipitation with 5 of rainfall, indicating that it's still relatively dry as Irkutsk transitions from the cold of winter to the warmth of spring.
Is May much warmer than the preceding months in Irkutsk?
Indeed, May in Irkutsk is significantly warmer than the preceding months, with the temperature rising to a pleasant 18 °C (65 °F) during the day.
What should visitors expect in terms of weather in Irkutsk during June?
Visitors in June can expect warm and comfortable weather in Irkutsk, with daytime temperatures around 23 °C (73 °F) and increased daylight for various activities.
Is July the warmest month in Irkutsk?
Yes, July is typically the warmest month in Irkutsk, allowing for a variety of outdoor summer activities with an average high of 25 °C (77 °F).
What type of climate can be expected in Irkutsk in August?
In August, expect a comfortable, yet humid, climate in Irkutsk with warm days and mild nights which allow for extensive enjoyment of the great outdoors.
What weather changes start to occur in Irkutsk as September approaches?
As September arrives, Irkutsk starts to transition into autumn with cooler temperatures, fewer sun hours, and an increase in the crispness of the air.
Does the temperature in Irkutsk drop significantly in October?
Definitely, there is a significant drop in temperature in Irkutsk during October, which requires warmer clothing to adjust to the average daytime high of 6 °C (44 °F) and the cold nights.
Is November the month where Irkutsk starts preparing for winter?
Yes, November is when Irkutsk starts to brace for the upcoming winter, with colder days and an increased likelihood of early winter weather.
How cold can December in Irkutsk get during the day?
December in Irkutsk can be exceedingly cold with daytime temperatures averaging at a chilly -11 °C (12 °F) and requiring full winter gear to stay warm.
We make the most from 40 years of historical weather data to predict the best weather conditions.
Deciding on where to go for a holiday is hard sometimes. Get inspired by the most popular destinations.
We aggregate data from combining multiple weather sources to ensure accuracy of the highest order.