Irkutsk weather in October

In October, Irkutsk sees average daytime highs of 7°C and overnight lows near -2°C, with 23 mm of precipitation across 5.7 wet days and about 10.3 hours of daylight. It is the 7th-warmest and 6th-wettest month of the year here.

Highs ease over the month, from about 11°C in the first days to 3°C by the end. The sky is clear or mostly clear about 30% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 24 min at the start of October to 9 h 24 min by month's end. Set against the rest of the year, October is Irkutsk's 3rd-clearest and 5th-windiest month. For the whole year in context, see Irkutsk's year-round climate.

Daytime high: 7°; 7th warmest
Overnight low: -2°; 7th coldest
Precipitation: 23 mm; 5.7 wet days
Daylight: 10 h 18 min; 7:38 AM – 5:58 PM
Cloud cover: 59%; 3rd clearest
Wind: 9 km/h; 5th windiest
Solar energy: 2.3 kWh/m²
Travel score: 1.1; out of 10

Irkutsk is capital city of Irkutsk Oblast, Siberia, in eastern Russia.

Density: 2,252/km²; people per km²
Founded: 1661

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

← September Irkutsk year-round climate November →Best places to visit in October

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 11°C in the first days to 3°C by the end.

A typical October day in Irkutsk reaches about 7°C in the afternoon and slips back to -2°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 1°C and 13°C. Set against its neighbours, October runs about 8°C cooler than September and about 11°C warmer than November.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°C)	11	11	11	10	10	10	10	9	9	9	9	8	8	8	7	7	7	6	6	6	5	5	5	5	4	4	4	3	3	3	2
Avg low (°C)	2	2	1	1	1	1	0	0	0	0	-1	-1	-1	-1	-2	-2	-2	-2	-3	-3	-3	-3	-3	-4	-4	-4	-4	-5	-5	-5	-5

	Avg high (°C)	Avg low (°C)
1	11	2
2	11	2
3	11	1
4	10	1
5	10	1
6	10	1
7	10	0
8	9	0
9	9	0
10	9	0
11	9	-1
12	8	-1
13	8	-1
14	8	-1
15	7	-2
16	7	-2
17	7	-2
18	6	-2
19	6	-3
20	6	-3
21	5	-3
22	5	-3
23	5	-3
24	5	-4
25	4	-4
26	4	-4
27	4	-4
28	3	-5
29	3	-5
30	3	-5
31	2	-5

How October really feels in Irkutsk

Once humidity and wind are folded in, October averages 0 days that feel above 32°C and 31 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

wind chill below the day's low

The story in October is cold — wind chill drags the overnight "feels like" below the raw low.

Irkutsk weather by month

How October compares with the rest of the year at a glance. October is the 7th-warmest and 6th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	-15° / -24°	5	1.8	3.3	8	0.0
Feb	-10° / -21°	5	1.8	3.2	9.5	0.0
Mar	-0° / -13°	10	3.4	4.4	11.5	0.0
Apr	9° / -3°	22	5.7	3.6	13.6	1.7
May	16° / 4°	38	8.9	1.4	15.4	5.0
Jun	21° / 10°	65	10.3	0	16.4	6.4
Jul	23° / 14°	94	12.2	0	16	6.5
Aug	21° / 12°	101	11.6	0	14.5	6.3
Sep	15° / 6°	61	10.2	0.6	12.4	4.6
Oct	7° / -2°	23	5.7	3.9	10.3	1.1
Nov	-4° / -11°	13	4	5.3	8.5	0.0
Dec	-13° / -20°	10	3.5	5.2	7.5	0.0

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 30% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 55%.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	46	47	46	46	46	47	47	47	48	48	48	48	47	47	47	47	47	47	47	46	46	45	45	44	43	43	42	41	40	40	40
Cloudier (%)	54	53	54	54	54	53	53	53	52	52	52	52	53	53	53	53	53	53	53	54	54	55	55	56	57	57	58	59	60	60	60

	Clearer (%)	Cloudier (%)
1	46	54
2	47	53
3	46	54
4	46	54
5	46	54
6	47	53
7	47	53
8	47	53
9	48	52
10	48	52
11	48	52
12	48	52
13	47	53
14	47	53
15	47	53
16	47	53
17	47	53
18	47	53
19	47	53
20	46	54
21	46	54
22	45	55
23	45	55
24	44	56
25	43	57
26	43	57
27	42	58
28	41	59
29	40	60
30	40	60
31	40	60

Chance of precipitation in October

Any precipitationSnow

Irkutsk gets around 23 mm of rain and snow over 5.7 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 19% and peaks near 25% on the wettest days, and about 4 days bring snow. The odds ease toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	25	25	24	23	23	22	21	21	21	20	20	20	20	20	19	19	19	18	18	18	18	18	17	17	17	17	17	17	17	16	16
Snow chance (%)	6	6	6	6	7	7	7	8	8	9	9	10	11	11	12	13	13	14	15	15	16	16	17	17	18	18	18	18	18	18	18

	Rain chance (%)	Snow chance (%)
1	25	6
2	25	6
3	24	6
4	23	6
5	23	7
6	22	7
7	21	7
8	21	8
9	21	8
10	20	9
11	20	9
12	20	10
13	20	11
14	20	11
15	19	12
16	19	13
17	19	13
18	18	14
19	18	15
20	18	15
21	18	16
22	18	16
23	17	17
24	17	17
25	17	18
26	17	18
27	17	18
28	17	18
29	17	18
30	16	18
31	16	18

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, October lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

Wind in October

Winds average 9 km/h in October.

Across October, daily wind ranges from about 9 km/h on the calmest days to 9 km/h at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (km/h)	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9	9
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	9	calm
2	9	calm
3	9	calm
4	9	calm
5	9	calm
6	9	calm
7	9	calm
8	9	calm
9	9	calm
10	9	calm
11	9	calm
12	9	calm
13	9	calm
14	9	calm
15	9	calm
16	9	calm
17	9	calm
18	9	calm
19	9	calm
20	9	calm
21	9	calm
22	9	calm
23	9	calm
24	9	calm
25	9	calm
26	9	calm
27	9	calm
28	9	calm
29	9	calm
30	9	calm
31	9	calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 24 min at the start of October to 9 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 120 minutes over October. Sunrise moves from 7:11 AM to 8:06 AM, and sunset from 6:33 PM to 5:27 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	11.4	11.3	11.2	11.1	11.1	11.0	10.9	10.9	10.8	10.7	10.7	10.6	10.5	10.5	10.4	10.3	10.3	10.2	10.1	10.1	10.0	9.9	9.9	9.8	9.7	9.7	9.6	9.5	9.5	9.4	9.4
Sunrise (AM)	7:11	7:13	7:15	7:16	7:18	7:20	7:22	7:23	7:25	7:27	7:29	7:31	7:32	7:34	7:36	7:38	7:40	7:42	7:43	7:45	7:47	7:49	7:51	7:53	7:54	7:56	7:58	8:00	8:02	8:04	8:06
Sunset (PM)	6:33	6:30	6:28	6:25	6:23	6:21	6:18	6:16	6:14	6:11	6:09	6:07	6:05	6:02	6:00	5:58	5:56	5:53	5:51	5:49	5:47	5:45	5:43	5:41	5:39	5:37	5:35	5:33	5:31	5:29	5:27

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.4	7:11	6:33
2	11.3	7:13	6:30
3	11.2	7:15	6:28
4	11.1	7:16	6:25
5	11.1	7:18	6:23
6	11.0	7:20	6:21
7	10.9	7:22	6:18
8	10.9	7:23	6:16
9	10.8	7:25	6:14
10	10.7	7:27	6:11
11	10.7	7:29	6:09
12	10.6	7:31	6:07
13	10.5	7:32	6:05
14	10.5	7:34	6:02
15	10.4	7:36	6:00
16	10.3	7:38	5:58
17	10.3	7:40	5:56
18	10.2	7:42	5:53
19	10.1	7:43	5:51
20	10.1	7:45	5:49
21	10.0	7:47	5:47
22	9.9	7:49	5:45
23	9.9	7:51	5:43
24	9.8	7:53	5:41
25	9.7	7:54	5:39
26	9.7	7:56	5:37
27	9.6	7:58	5:35
28	9.5	8:00	5:33
29	9.5	8:02	5:31
30	9.4	8:04	5:29
31	9.4	8:06	5:27

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 2.3 kWh/m².

For context, solar energy here swings from a low near 0.91 kWh/m² to a high of 6.06 kWh/m² in June across the year — October's 2.3 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	2.9	2.8	2.8	2.8	2.7	2.7	2.6	2.6	2.6	2.5	2.5	2.4	2.4	2.4	2.3	2.3	2.2	2.2	2.1	2.1	2.1	2.0	2.0	2.0	1.9	1.9	1.9	1.8	1.8	1.8	1.7
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	2.9	Moderate
2	2.8	Moderate
3	2.8	Moderate
4	2.8	Moderate
5	2.7	Moderate
6	2.7	Moderate
7	2.6	Moderate
8	2.6	Moderate
9	2.6	Moderate
10	2.5	Moderate
11	2.5	Moderate
12	2.4	Moderate
13	2.4	Moderate
14	2.4	Moderate
15	2.3	Moderate
16	2.3	Moderate
17	2.2	Moderate
18	2.2	Moderate
19	2.1	Moderate
20	2.1	Moderate
21	2.1	Moderate
22	2.0	Moderate
23	2.0	Moderate
24	2.0	Dim
25	1.9	Dim
26	1.9	Dim
27	1.9	Dim
28	1.8	Dim
29	1.8	Dim
30	1.8	Dim
31	1.7	Dim

Planning a trip in October

Is October a good time to visit Irkutsk?

Our two travel scores rate October for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

1.1

Sightseeing

7th-best month of the year

0.0

Beach & pool

7th-best month of the year

October is a weaker month for outdoor sightseeing in Irkutsk.

What to pack for Irkutsk in October

From October's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In October, Irkutsk sees daytime highs around 7°C and nights near -2°C. Pack a warm layer. Worth having: a heavy coat. About 6 days see rain.

a warm layera heavy coat

UV index in Irkutsk in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 2. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Irkutsk peaks around July 12 at about 7 (high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 19 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 6 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	1	2	5	5	6	7	5	4	2	1	1
Level	Low	Low	Moderate	Moderate	High	High	High	Moderate	Moderate	Low	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	1	Low
Mar	2	Moderate
Apr	5	Moderate
May	5	High
Jun	6	High
Jul	7	High
Aug	5	Moderate
Sep	4	Moderate
Oct	2	Low
Nov	1	Low
Dec	1	Low

Air quality in Irkutsk in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Irkutsk is worst in May — around 22 µg/m³ PM2.5 (moderate), about 2.2× the cleanest month (November, 10 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	15	15	13	17	22	16	18	18	11	12	10	12
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Good

	PM2.5 (µg/m³)	Level
Jan	15	Moderate
Feb	15	Moderate
Mar	13	Moderate
Apr	17	Moderate
May	22	Moderate
Jun	16	Moderate
Jul	18	Moderate
Aug	18	Moderate
Sep	11	Good
Oct	12	Good
Nov	10	Good
Dec	12	Good

Location & terrain

Where is Irkutsk?

Irkutsk sits at 52.3°N, 104.3°E, 415 m above sea level, in Russia. The nearest listed city is Markova, 11 km away.

Topography around Irkutsk

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Irkutsk.

Within 3 km, the terrain around Irkutsk has only modest variations in elevation — a maximum elevation change of 104 m around an average of 442 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 204 m; within 80 km, large variations in elevation — a maximum elevation change of 1,089 m.

The land around Irkutsk is covered by artificial surfaces (54%) and trees (27%) within 3 km, trees (58%) within 16 km, and trees (69%) within 80 km.

3 km

104 m

artificial surfaces 54%

16 km

204 m

trees 58%

80 km

1,089 m

trees 69%

treesgrasslandcroplandartificial surfacesbare terrainwater

← September Irkutsk year-round climate November →Best places to visit in October

October weather nearby: Markova 11 km · Shelekhov 16 km · Angarsk 39 km · Usol’ye-Sibirskoye 67 km · Slyudyanka 81 km · Baykal’sk 87 km · Cheremkhovo 125 km · Gusinoozyorsk 189 km

Russia travel facts

Travel advisory: Level 4; Do Not Travel
Power plugs: Type C / F; 230 V · 50 Hz
Prices: ≈ 32% of US; price level, 2025
GDP per capita: $17,547; 2025
Happiness: 5.8 / 10; World Happiness, 2025
Safe drinking water: 76%; of population, 2024
Homicide rate: 6.8; per 100k, 2021
Road deaths: 12; per 100k/yr, 2019
Income group: High; World Bank
English: Moderate; EF EPI 521
Religion

Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.

Data sources

Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Irkutsk (52.2957°, 104.2908°, elevation 415 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).

	Avg high (°C)	Avg low (°C)
1	11	2
2	11	2
3	11	1
4	10	1
5	10	1
6	10	1
7	10	0
8	9	0
9	9	0
10	9	0
11	9	-1
12	8	-1
13	8	-1
14	8	-1
15	7	-2
16	7	-2
17	7	-2
18	6	-2
19	6	-3
20	6	-3
21	5	-3
22	5	-3
23	5	-3
24	5	-4
25	4	-4
26	4	-4
27	4	-4
28	3	-5
29	3	-5
30	3	-5
31	2	-5

	Clearer (%)	Cloudier (%)
1	46	54
2	47	53
3	46	54
4	46	54
5	46	54
6	47	53
7	47	53
8	47	53
9	48	52
10	48	52
11	48	52
12	48	52
13	47	53
14	47	53
15	47	53
16	47	53
17	47	53
18	47	53
19	47	53
20	46	54
21	46	54
22	45	55
23	45	55
24	44	56
25	43	57
26	43	57
27	42	58
28	41	59
29	40	60
30	40	60
31	40	60

	Rain chance (%)	Snow chance (%)
1	25	6
2	25	6
3	24	6
4	23	6
5	23	7
6	22	7
7	21	7
8	21	8
9	21	8
10	20	9
11	20	9
12	20	10
13	20	11
14	20	11
15	19	12
16	19	13
17	19	13
18	18	14
19	18	15
20	18	15
21	18	16
22	18	16
23	17	17
24	17	17
25	17	18
26	17	18
27	17	18
28	17	18
29	17	18
30	16	18
31	16	18

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	11	2
2	11	2
3	11	1
4	10	1
5	10	1
6	10	1
7	10	0
8	9	0
9	9	0
10	9	0
11	9	-1
12	8	-1
13	8	-1
14	8	-1
15	7	-2
16	7	-2
17	7	-2
18	6	-2
19	6	-3
20	6	-3
21	5	-3
22	5	-3
23	5	-3
24	5	-4
25	4	-4
26	4	-4
27	4	-4
28	3	-5
29	3	-5
30	3	-5
31	2	-5

	Clearer (%)	Cloudier (%)
1	46	54
2	47	53
3	46	54
4	46	54
5	46	54
6	47	53
7	47	53
8	47	53
9	48	52
10	48	52
11	48	52
12	48	52
13	47	53
14	47	53
15	47	53
16	47	53
17	47	53
18	47	53
19	47	53
20	46	54
21	46	54
22	45	55
23	45	55
24	44	56
25	43	57
26	43	57
27	42	58
28	41	59
29	40	60
30	40	60
31	40	60

	Rain chance (%)	Snow chance (%)
1	25	6
2	25	6
3	24	6
4	23	6
5	23	7
6	22	7
7	21	7
8	21	8
9	21	8
10	20	9
11	20	9
12	20	10
13	20	11
14	20	11
15	19	12
16	19	13
17	19	13
18	18	14
19	18	15
20	18	15
21	18	16
22	18	16
23	17	17
24	17	17
25	17	18
26	17	18
27	17	18
28	17	18
29	17	18
30	16	18
31	16	18

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°C)	Avg low (°C)
1	11	2
2	11	2
3	11	1
4	10	1
5	10	1
6	10	1
7	10	0
8	9	0
9	9	0
10	9	0
11	9	-1
12	8	-1
13	8	-1
14	8	-1
15	7	-2
16	7	-2
17	7	-2
18	6	-2
19	6	-3
20	6	-3
21	5	-3
22	5	-3
23	5	-3
24	5	-4
25	4	-4
26	4	-4
27	4	-4
28	3	-5
29	3	-5
30	3	-5
31	2	-5

	Clearer (%)	Cloudier (%)
1	46	54
2	47	53
3	46	54
4	46	54
5	46	54
6	47	53
7	47	53
8	47	53
9	48	52
10	48	52
11	48	52
12	48	52
13	47	53
14	47	53
15	47	53
16	47	53
17	47	53
18	47	53
19	47	53
20	46	54
21	46	54
22	45	55
23	45	55
24	44	56
25	43	57
26	43	57
27	42	58
28	41	59
29	40	60
30	40	60
31	40	60

	Rain chance (%)	Snow chance (%)
1	25	6
2	25	6
3	24	6
4	23	6
5	23	7
6	22	7
7	21	7
8	21	8
9	21	8
10	20	9
11	20	9
12	20	10
13	20	11
14	20	11
15	19	12
16	19	13
17	19	13
18	18	14
19	18	15
20	18	15
21	18	16
22	18	16
23	17	17
24	17	17
25	17	18
26	17	18
27	17	18
28	17	18
29	17	18
30	16	18
31	16	18

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100