AI-generatedIrkutsk at a glance
- Best time
- May – Aug
- Warmest month
- Jul · 25°
- Sunshine a year
- 2,300 h
- Rain a year
- 379 mm
- Climate
- Continental
- Time zone
- UTC+8
- Elevation
- 415 m
Climate in Irkutsk
Irkutsk has warm to hot summers and cold winters with occasional snow. July is the warmest month with average highs of 25 °C, while January is the coolest at −14 °C. With around 2,300 hours of sunshine a year, Irkutsk is sunny; June is the sunniest month with 9.2 hours a day.
Holiday weather through the year
Weather in October
Holiday weather in October
Poor
Best time to visit: May – August
A typical day in October
- Morning, 08:00: about -1°
- Midday, 13:00: about 6°
- Afternoon, 16:00: about 6°
- Evening, 20:00: about 3°
- Night, 23:00: about 1°
07:2618:11
Cold evenings: bring a warm jacket.
Estimated from the average high and low: coolest around sunrise, warmest in mid-afternoon.
Light for photos in October
- Golden hour
- Morning 07:05–08:13 · evening 17:24–18:32
- Blue hour
- Morning 06:52–07:05 · evening 18:32–18:45
Golden hour: the sun between 4° below and 6° above the horizon; blue hour: 6° to 4° below it. Times for the 15th of the month; mountains and clouds shift the light.
What is the weather like in Irkutsk in October?
In October, Irkutsk is cold: daytime highs average 7 °C, and nights often drop below freezing (−2 °C). Expect around 5 hours of sunshine a day. Rain falls on about 5 days, adding up to 19 mm. Snow falls on about 2 days. All in all, October is not an ideal month for a holiday in Irkutsk.
More details for October
- Daylight
- 10 h 45 min07:26 – 18:11
- UV index
- 2 · lowclear sky, noon (estimate)All months
- Muggy days
- 0 daysdew point 18 °C or moreAll months
- Wind
- 14 km/haverage daily peakAll months
- Cloud cover
- 58 %on averageAll months
- Hot days
- 0 days30 °C or moreAll months
- Snow days
- 2 days1 cm or more of fresh snowAll months
- Time zone
- UTC+8Asia/Irkutsk
How the score comes together
- Temperatureweight 50 %0 %
- Sunshineweight 20 %33 %
- Few rainy daysweight 30 %91 %
Each factor is rated from 0 to 100 % and weighted for the travel style “City break”.
What to pack in October
- Warm jacket
Sunshine hours in Irkutsk
Average hours of bright sunshine per day, next to the length of the day. Tap a month to select it.
In October, the sun shines for about 5.0 of 10.8 hours of daylight in Irkutsk, 46 % of the day.
Sunshine hours: measured at the weather station 4 km away, averages 1991–2020 (WMO climate normals). Daylight is the time from sunrise to sunset on the 15th of the month.
UV index in Irkutsk
How strong the sun is at noon, month by month, and how quickly unprotected skin burns.
- Clear-sky UV in October
- 2 · lowLittle protection needed; sunglasses on bright days.
The sun is strongest in June (UV 7).
Minutes until sunburn in October
- Very fair skin
- about 70 min
- Fair skin
- about 90 min
- Light brown skin
- over 2 h
- Olive skin
- over 2 h
Rough guide for unprotected skin at noon under a clear sky; clouds lengthen it, water, sand and snow shorten it. Sunscreen extends the time only partly.
Monthly values: clear-sky noon estimate from the sun's angle, ozone and altitude. UV today: Open-Meteo forecast.
Rain in Irkutsk: rainy days and rainfall
A rainy day is a day with at least 1 mm of rain or snow; the amount is what falls in the whole month. Tap a month to select it.
In October, Irkutsk has about 5 rainy days with 19 mm of rain in total.
Wind and clouds in Irkutsk
How breezy and how cloudy Irkutsk is through the year. Tap a month to select it on the whole page.
Wind
Typical daily peak of the wind in km/h: what the afternoon breeze usually reaches, not the gusts.
In October, the wind in Irkutsk typically peaks at 14 km/h during the day: Beaufort 3, light breeze.
Clouds
Average share of the sky covered by cloud, day and night.
In October, cloud covers on average 58 % of the sky over Irkutsk: variable cloud, with about 5.0 hours of sunshine a day.
Wind: mean daily maximum of the hourly wind 10 m above ground (ERA5, 1996–2025). Gusts are stronger, and the model grid of about 28 km smooths out local effects such as capes and valley winds. Clouds: mean total cloud cover of all layers over day and night (ERA5, 1996–2025). Thin high cloud counts as cover even when the sun still shines through.
Heat and humidity in Irkutsk
How often the day gets hot in Irkutsk (30 °C and more), and in which months heat and humidity come together. Tap a month to select it.
Heat calendar
- pleasant
- some hot or muggy days
- often muggy
- often hot
- hot and muggy
In October, Irkutsk has about 0 hot days, with an average daytime high of 7 °C: pleasant. Heat plays no part this month.
Hot days reach at least 30 °C; a month counts as muggy when the mean dew point reaches 18 °C on at least 15 days. Averages from ERA5 and ERA5-Land, 1996–2025. Muggy nights through the year
Snow in Irkutsk
When Irkutsk is likely to be white: the chance of seeing snow during a week's stay, the days with fresh snow and how much falls. Tap a month to select it.
Snow calendar
- hardly any
- possible
- likely
- very likely
In October, Irkutsk has about 2 days with at least 1 cm of fresh snow, 6 cm in total. The chance of seeing snow during a week's stay is 22 out of 100: possible.
Snow days bring at least 1 cm of fresh snow. Fresh snow comes from ERA5 snowfall (1996–2025) at the height of the place, not on the slopes above it; the snow chance also weighs whether the snow settles. An estimate from climate averages, not a snow report.
Climate through the year
Long-term monthly averages. Tap a month to see its details.
Nights and sleep in Irkutsk
How warm the nights get in each month, from the mean night-time low. Tap a month for details.
- Frost below 0°
- Cold 0–8°
- Cool 8–15°
FrostOctober: nights around −2°. Heating and warm bedding are a must.
The coolest nights are in January (−23°), the warmest in July (14°). Nights fall below 8 °C on average from September to May, so the room should be heated.
Temperatures through the year
Average daytime high, night-time low and sea temperature per month.
| Month | Score | Day | Night | Sun | Rain days | Rain mm |
|---|---|---|---|---|---|---|
| JanuaryJan | 32 | −14° | −23° | 3.5 h | 2 | 5 |
| FebruaryFeb | 39 | −9° | −20° | 5.6 h | 2 | 4 |
| MarchMar | 44 | 1° | −12° | 7.3 h | 3 | 9 |
| AprilApr | 53 | 10° | −3° | 8.3 h | 6 | 18 |
| MayMay | 85 | 17° | 3° | 8.9 h | 9 | 34 |
| JuneJun | 87 | 23° | 11° | 9.2 h | 10 | 60 |
| JulyJul | 81 | 25° | 14° | 8.6 h | 12 | 84 |
| AugustAug | 80 | 22° | 12° | 7.5 h | 11 | 80 |
| SeptemberSep | 67 | 16° | 6° | 6.1 h | 10 | 46 |
| OctoberOct | 34 | 7° | −2° | 5.0 h | 5 | 19 |
| NovemberNov | 31 | −3° | −11° | 3.2 h | 3 | 10 |
| DecemberDec | 30 | −12° | −20° | 2.4 h | 3 | 9 |
Climate averages 1996–2025, not a forecast. Data: Copernicus ERA5 / ERA5-Land via Open-Meteo.com (CC BY 4.0), NOAA OISST, WMO 1991–2020 (NOAA NCEI), GeoNames (CC BY 4.0). Sources & licences
52.30° N, 104.29° E · 415 m · Asia/Irkutsk
Best time to visit Irkutsk
The best time to visit Irkutsk is from May to August. For sightseeing, day trips and hiking, conditions are most comfortable from May to June and from August to September. The wettest month is July with 84 mm of precipitation.
Irkutsk through the seasons
How the weather changes over the seasons, with averages for each.
Irkutsk in spring
Mar – May
Good
- 1–17 °C by day
- 8 h of sun a day
- 17 rainy days in all
Irkutsk in summer
Jun – Aug
Excellent
- 22–25 °C by day
- 8 h of sun a day
- 33 rainy days in all
Irkutsk in autumn
Sep – Nov
Fair
- -3–16 °C by day
- 5 h of sun a day
- 18 rainy days in all
Irkutsk in winter
Dec – Feb
Poor
- -14–-9 °C by day
- 4 h of sun a day
- 7 rainy days in all
Find your perfect month
Tell us what you like and we rate every month in Irkutsk for you.
Your best months: June – August
Based on the climate averages; tap a month to see its details.
Compare two months in Irkutsk
Pick two months to see how the weather differs. A tick marks the clearly better value; for temperatures it depends on your plans.
June has the better holiday weather in Irkutsk: score 87 against 34. In June, days are 16 °C warmer than in October. June has 5 more rainy days. The sun shines 4 hours longer a day in June.
| Month | October | June |
|---|---|---|
| Weather score | 34 | 87better |
| Day high | 7° | 23° |
| Night low | −2° | 11° |
| Sunshine | 5.0 h | 9.2 hbetter |
| Rainy days | 5better | 10 |
| Rainfall | 19 mmbetter | 60 mm |
Based on the climate averages 1996–2025.
Which month for what?
Beach & swimming
No sea nearby
Sea from 21 °C, warm and mostly dry
Sightseeing & hiking
May – Jun, Aug – Sep
15–28 °C and not too much rain
Rainy months
Jul
12 or more rainy days
Snow
Mar – Apr, Nov – Dec
Snow on 2 or more days
Irkutsk month by month
The typical weather for every month at a glance.
32January-14° · 4 h
In January, Irkutsk is freezing cold: daytime highs average −14 °C, and nights often drop below freezing (−23 °C). The sun is scarce, with only about 4 hours a day. It hardly ever rains. Snow falls on about 2 days. All in all, January is not an ideal month for a holiday in Irkutsk.
Irkutsk in January39February-9° · 6 h
In February, Irkutsk is freezing cold: daytime highs average −9 °C, and nights often drop below freezing (−20 °C). Expect around 6 hours of sunshine a day. It hardly ever rains. All in all, February is not an ideal month for a holiday in Irkutsk.
Irkutsk in February44March1° · 7 h
In March, Irkutsk is freezing cold: daytime highs average 1 °C, and nights often drop below freezing (−12 °C). The sun shines for around 7 hours a day. Precipitation, often as snow, falls on about 3 days, totalling 9 mm. Snow falls on about 2 days. All in all, March is a so-so month for a holiday in Irkutsk.
Irkutsk in March53April10° · 8 h
In April, Irkutsk is cold: daytime highs average 10 °C, and nights often drop below freezing (−3 °C). The sun shines for around 8 hours a day. Rain falls on about 6 days, adding up to 18 mm. Snow falls on about 2 days. All in all, April is a so-so month for a holiday in Irkutsk.
Irkutsk in April85May17° · 9 h
In May, Irkutsk is mild: daytime highs average 17 °C, and nights cool down to about 3 °C. The sun shines for around 9 hours a day. Rain falls on about 9 days, adding up to 34 mm. All in all, May is an excellent month for a holiday in Irkutsk.
Irkutsk in May87June23° · 9 h
In June, Irkutsk is warm: daytime highs average 23 °C, and nights cool down to about 11 °C. With around 9 hours of sunshine a day, there is plenty of sun. Rain is frequent, with about 10 rainy days and 60 mm in total. All in all, June is an excellent month for a holiday in Irkutsk.
Irkutsk in June81July25° · 9 h
In July, Irkutsk is warm: daytime highs average 25 °C, and nights cool down to about 14 °C. The sun shines for around 9 hours a day. Rain is frequent, with about 12 rainy days and 84 mm in total. All in all, July is an excellent month for a holiday in Irkutsk.
Irkutsk in July80August22° · 8 h
In August, Irkutsk is warm: daytime highs average 22 °C, and nights cool down to about 12 °C. The sun shines for around 8 hours a day. Rain is frequent, with about 11 rainy days and 80 mm in total. All in all, August is an excellent month for a holiday in Irkutsk.
Irkutsk in August67September16° · 6 h
In September, Irkutsk is cool: daytime highs average 16 °C, and nights cool down to about 6 °C. Expect around 6 hours of sunshine a day. Rain is frequent, with about 10 rainy days and 46 mm in total. All in all, September is a good month for a holiday in Irkutsk.
Irkutsk in September34October7° · 5 h
In October, Irkutsk is cold: daytime highs average 7 °C, and nights often drop below freezing (−2 °C). Expect around 5 hours of sunshine a day. Rain falls on about 5 days, adding up to 19 mm. Snow falls on about 2 days. All in all, October is not an ideal month for a holiday in Irkutsk.
Irkutsk in October31November-3° · 3 h
In November, Irkutsk is freezing cold: daytime highs average −3 °C, and nights often drop below freezing (−11 °C). The sun is scarce, with only about 3 hours a day. Precipitation, often as snow, falls on about 3 days, totalling 10 mm. Snow falls on about 3 days. All in all, November is not an ideal month for a holiday in Irkutsk.
Irkutsk in November30December-11° · 2 h
In December, Irkutsk is freezing cold: daytime highs average −12 °C, and nights often drop below freezing (−20 °C). The sun is scarce, with only about 2 hours a day. Precipitation, often as snow, falls on about 3 days, totalling 9 mm. Snow falls on about 3 days. All in all, December is not an ideal month for a holiday in Irkutsk.
Irkutsk in DecemberIrkutsk compared
Put Irkutsk side by side with another destination.
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Irkutsk vs. Ulan-Ude
In October the holiday weather in Irkutsk and Ulan-Ude is about equally good (score 34 vs. 37). During the day Ulan-Ude is 1 °C cooler than Irkutsk.
| in October | Irkutsk | Ulan-Ude |
|---|---|---|
| Holiday score | 34 | 37 |
| Daytime high | 7° | 6° |
| Sunshine | 5 h | 5 h |
| Rainy days | 5 | 4 |
| Best time | May – Aug | May – Aug |
Through the year
Russia in October: the best places
In October, Irkutsk ranks 8 among the 31 nearest destinations in this country.
- Astrakhan16°73
- 2Vladivostok13°14°59
- 3Yuzhno-Sakhalinsk11°40
- 4Orenburg10°38
- 5Ulan-Ude6°37
- 6Saratov11°36
- 7Birobidzhan8°35
- 8IrkutskThis page7°34
Planning a trip to Irkutsk
Weather for your travel dates
Pick your arrival and length of stay, and we sum up the weather to expect.
Irkutsk in the school holidays
How the weather suits the usual holiday periods. Dates vary by school and region, so each holiday uses the months it usually falls in.
Irkutsk has its best school-holiday weather during May half-term (score 85) and its weakest during the Christmas holidays (score 31).
- 50
Easter holidays
Mar – Apr
Fair
- 7 °C by day
- 8.0 h of sun a day
- 5 rainy days a month
Keep in mind: Snow
- 85
May half-term
May – Jun
ExcellentBest holidays
- 18 °C by day
- 9.0 h of sun a day
- 9 rainy days a month
Good for: Sightseeing & walks
- 80
Summer holidays
Jul – Aug
Excellent
- 23 °C by day
- 7.9 h of sun a day
- 11 rainy days a month
Keep in mind: Frequent rain
- 34
October half-term
Oct
Poor
- 7 °C by day
- 5.0 h of sun a day
- 5 rainy days a month
- 31
Christmas holidays
Dec – Jan
Poor
- −13 °C by day
- 3.0 h of sun a day
- 3 rainy days a month
Keep in mind: Snow
Based on the climate averages 1996–2025.
Getting there
Flying from
- Nonstop flight
- about 8 h 20 min
- Distance
- 6,510 km
- Time zone
- UTC+8
- Jet lag
- About 7 days (7 h east)
Rule of thumb for flying east: for a few days before, go to bed and get up a little earlier, and get plenty of morning light at your destination.
Estimated from the straight-line distance: 30 minutes for take-off and landing plus 830 km/h cruising speed.
Frequently asked questions about Irkutsk
When is the best time to visit Irkutsk?
The best time to visit Irkutsk is from May to August. That is when the holiday weather score, which combines temperature, sea, sunshine and rain, is highest.
What is the warmest month in Irkutsk?
July is the warmest month, with average highs of 25 °C and nights around 14 °C. January is the coolest month at −14 °C.
When does it rain most in Irkutsk?
The wettest month is July with 84 mm of precipitation. The driest month is February with 4 mm.
How many hours of sunshine does Irkutsk get?
Irkutsk gets around 2,300 hours of sunshine a year. The sunniest month is June with 9.2 hours a day; in December there are 2.4 hours a day.
What time zone is Irkutsk in?
Irkutsk uses the time zone Asia/Irkutsk, at UTC+8 all year.
How long is the flight from London to Irkutsk?
A nonstop flight from London to Irkutsk takes about 8 h 20 min, for a straight-line distance of about 6,510 km.
Which school holidays are best for Irkutsk?
Irkutsk has its best school-holiday weather during May half-term (score 85) and its weakest during the Christmas holidays (score 31). Holiday ratings (0–100): Easter holidays 50, May half-term 85, Summer holidays 80, October half-term 34, Christmas holidays 31.
Near Irkutsk
Other destinations close by.
Places with a climate like Irkutsk
Destinations whose weather through the year is closest to Irkutsk's – good alternatives.