Zheleznogorsk-Ilimskiy weather in September

In September, Zheleznogorsk-Ilimskiy sees average daytime highs of 12°C and overnight lows near 3°C, with 53 mm of precipitation across 11.6 wet days and about 12.5 hours of daylight. It is the 5th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 16°C in the first days to 8°C by the end. The sky is clear or mostly clear about 15% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 42 min at the start of September to 11 h 18 min by month's end. Set against the rest of the year, September is Zheleznogorsk-Ilimskiy's 5th-clearest and 8th-windiest month. For the whole year in context, see Zheleznogorsk-Ilimskiy's year-round climate.

Daytime high
12°
5th warmest
Overnight low
9th coldest
Precipitation
53 mm
11.6 wet days
Daylight
12 h 30 min
6:44 AM – 7:12 PM
Cloud cover
72%
5th clearest
Wind
10 km/h
8th windiest
Solar energy
2.92 kWh/m²
Travel score
3.0
out of 10

Zheleznogorsk-Ilimskiy is human settlement in Nizhneilimsky District, Irkutsk Oblast, Russia.

Density
279/km²
people per km²
Founded
1948

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 16°C in the first days to 8°C by the end.

A typical September day in Zheleznogorsk-Ilimskiy reaches about 12°C in the afternoon and slips back to 3°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 6°C and 19°C. Set against its neighbours, September runs about 8°C cooler than August and about 10°C warmer than October.

-10°10°20°151015202530
Avg high (°C)Avg low (°C)
1177
2166
3166
4166
5156
6155
7155
8145
9144
10144
11144
12134
13133
14133
15123
16123
17122
18122
19112
20112
21111
22101
23101
24101
2590
2690
2790
2880
298-1
308-1

How September really feels in Zheleznogorsk-Ilimskiy

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 15 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C
0
heat index over the day's high
Days feeling ≤ C
15
wind chill below the day's low

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

Zheleznogorsk-Ilimskiy weather by month

How September compares with the rest of the year at a glance. September is the 5th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-19° / -26°155.797.20.0
Feb-13° / -23°134.77.29.10.0
Mar-4° / -15°185.88.511.40.0
Apr / -6°278.36.413.90.4
May14° / 4511.51.916.13.7
Jun21° / 5711017.36.2
Jul23° / 13°6711.4016.86.6
Aug20° / 10°6911.4014.96.1
Sep12° / 5311.61.212.53.0
Oct / -5°3810.28.7100.1
Nov-10° / -17°309.3127.90.0
Dec-17° / -24°237.5116.60.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 15% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 12% of September, with mostly cloudy or overcast conditions the remaining 73%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
13169
23070
32971
42971
52971
62872
72872
82872
92773
102773
112773
122674
132674
142773
152773
162773
172773
182773
192773
202773
212674
222773
232674
242674
252674
262674
272575
282575
292377
302278

Chance of precipitation in September

Any precipitationSnow

Zheleznogorsk-Ilimskiy gets around 53 mm of rain and snow over 11.6 wet days in September. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 38% and peaks near 41% on the wettest days, and about 1 day brings snow.

0%10%20%30%40%50%151015202530
Rain chance (%)Snow chance (%)
1411
2411
3411
4411
5411
6401
7402
8402
9402
10402
11403
12393
13393
14383
15383
16374
17374
18374
19374
20375
21375
22376
23376
24377
25377
26378
27379
283710
293711
303712

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

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

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)
1973
2982
3991
4991
5991
6991
7991
81000
91000
101000
111000
121000
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000

Wind in September

Winds average 10 km/h in September.

Across September, daily wind ranges from about 10 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.

051015151015202530
Wind speed (km/h)Feels
110calm
210calm
310calm
410calm
510calm
610calm
710calm
810calm
910calm
1010calm
1110calm
1210calm
1310calm
1410calm
1510calm
1610calm
1710calm
1810calm
1910calm
2010calm
2110calm
2210calm
2310calm
2410calm
2510calm
2610calm
2710calm
2810calm
2910calm
3010calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 13 h 42 min at the start of September to 11 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 144 minutes over September. Sunrise moves from 6:13 AM to 7:13 AM, and sunset from 7:54 PM to 6:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.76:137:54
213.66:157:51
313.56:177:48
413.46:197:45
513.46:217:43
613.36:237:40
713.26:257:37
813.16:277:34
913.06:297:32
1013.06:317:29
1112.96:337:26
1212.86:357:23
1312.76:387:20
1412.66:407:17
1512.56:427:15
1612.56:447:12
1712.46:467:09
1812.36:487:06
1912.26:507:03
2012.16:527:01
2112.16:546:58
2212.06:566:55
2311.96:586:52
2411.87:006:49
2511.77:026:47
2611.77:056:44
2711.67:076:41
2811.57:096:38
2911.47:116:35
3011.37:136:33

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 2.92 kWh/m².

For context, solar energy here swings from a low near 0.46 kWh/m² to a high of 5.99 kWh/m² in June across the year — September's 2.92 kWh/m² falls in the middle.

01234151015202530
Solar energy (kWh/m²)Level
13.6Moderate
23.6Moderate
33.5Moderate
43.5Moderate
53.4Moderate
63.4Moderate
73.3Moderate
83.3Moderate
93.2Moderate
103.2Moderate
113.1Moderate
123.1Moderate
133.0Moderate
143.0Moderate
153.0Moderate
162.9Moderate
172.9Moderate
182.8Moderate
192.8Moderate
202.7Moderate
212.7Moderate
222.6Moderate
232.6Moderate
242.5Moderate
252.5Moderate
262.4Moderate
272.4Moderate
282.3Moderate
292.3Moderate
302.2Moderate
Planning a trip in September

Is September a good time to visit Zheleznogorsk-Ilimskiy?

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

3.0
Sightseeing
5th-best month of the year
0.2
Beach & pool
5th-best month of the year

September is a weaker month for outdoor sightseeing in Zheleznogorsk-Ilimskiy.

What to pack for Zheleznogorsk-Ilimskiy in September

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

In September, Zheleznogorsk-Ilimskiy sees daytime highs around 12°C and nights near 3°C. Worth packing: a warm layer and rain gear. About 12 days see rain.

a warm layerrain gear

UV index in Zheleznogorsk-Ilimskiy in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Zheleznogorsk-Ilimskiy peaks around June 20 at about 6 (high) — a little sun protection helps at midday. It bottoms out near January 1 at about 0 (low).

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

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 20UV 6Jan 1UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr4Moderate
May5Moderate
Jun6High
Jul5High
Aug5Moderate
Sep3Moderate
Oct1Low
Nov1Low
Dec0Low

Air quality in Zheleznogorsk-Ilimskiy in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Zheleznogorsk-Ilimskiy is worst in July — around 44 µg/m³ PM2.5 (poor), about 37.0× the cleanest month (December, 1 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodModeratePoorModerateGoodJul 1742 µg/m³Dec 171 µg/m³
PM2.5 (µg/m³)Level
Jan3Good
Feb4Good
Mar5Good
Apr8Good
May11Good
Jun24Moderate
Jul44Poor
Aug26Moderate
Sep25Moderate
Oct12Good
Nov3Good
Dec1Good
Location & terrain

Where is Zheleznogorsk-Ilimskiy?

Zheleznogorsk-Ilimskiy sits at 56.6°N, 104.1°E, 392 m above sea level, in Russia. The nearest listed city is Ust’-Kut, 104 km away.

Topography around Zheleznogorsk-Ilimskiy

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

Within 3 km, the terrain around Zheleznogorsk-Ilimskiy has significant variations in elevation — a maximum elevation change of 579 m around an average of 489 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 609 m; within 80 km, large variations in elevation — a maximum elevation change of 821 m.

The land around Zheleznogorsk-Ilimskiy is covered by trees (71%) within 3 km, trees (91%) within 16 km, and trees (97%) within 80 km.

3 km
579 m
16 km
609 m
80 km
821 m
treesgrasslandartificial surfacesbare terrainwater
September weather nearby: Ust’-Kut 104 km · Bratsk 163 km · Ust’-Ilimsk 181 km · Vikhorevka 189 km · Chunskiy 282 km · Sayansk 300 km · Tulun 316 km · Zima 324 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
other Christian 2%

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 Zheleznogorsk-Ilimskiy (56.5767°, 104.1297°, elevation 392 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).