Ust’-Kut weather in August

In August, Ust’-Kut sees average daytime highs of 20°C and overnight lows near 9°C, with 72 mm of rain across 11.3 wet days and about 14.9 hours of daylight. It is the 3rd-warmest and 1st-wettest month of the year here.

Highs ease over the month, from about 23°C in the first days to 17°C by the end. The sky is clear or mostly clear about 20% of the time in August, and the air most often feels dry.

Daylight stretches from about 16 hours at the start of August to 13 h 48 min by month's end. Set against the rest of the year, August is Ust’-Kut's 2nd-clearest and 11th-windiest month. For the whole year in context, see Ust’-Kut's year-round climate.

Daytime high
20°
3rd warmest
Overnight low
11th coldest
Rainfall
72 mm
11.3 wet days
Daylight
15 hours
5:32 AM – 8:30 PM
Cloud cover
66%
2nd clearest
Wind
7 km/h
11th windiest
Solar energy
4.42 kWh/m²
Travel score
6.0
out of 10

Ust’-Kut is human settlement in Ust-Kutsky District, Irkutsk Oblast, Russia.

Density
861/km²
people per km²
Founded
1631

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

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 23°C in the first days to 17°C by the end.

A typical August day in Ust’-Kut reaches about 20°C in the afternoon and slips back to 9°C overnight — a 11°C spread between the day's warmth and the night's chill. On most days the high lands between 15°C and 27°C. Set against its neighbours, August runs about 3°C cooler than July and about 9°C warmer than September.

10°20°30°151015202531
Avg high (°C)Avg low (°C)
12311
22311
32311
42311
52311
62211
72211
82211
92211
102210
112210
122110
132110
142110
152110
162110
17219
18209
19209
20209
21209
22198
23198
24198
25198
26188
27187
28187
29177
30176
31176

How August really feels in Ust’-Kut

Once humidity and wind are folded in, August averages 0 days that feel above 32°C and 0 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
0
wind chill below the day's low

August sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Ust’-Kut weather by month

How August compares with the rest of the year at a glance. August is the 3rd-warmest and 1st-wettest month here — the current month is highlighted below.

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-20° / -28°134.78.67.20.0
Feb-14° / -24°113.879.10.0
Mar-4° / -16°186.28.611.40.0
Apr / -7°289713.90.4
May14° / 4411.72.116.13.6
Jun21° / 5711.8017.46.0
Jul23° / 12°6911.4016.96.6
Aug20° / 7211.3014.96.0
Sep12° / 5111.21.312.52.9
Oct / -6°3710.48.9100.1
Nov-11° / -19°278.611.47.80.0
Dec-18° / -26°186.610.26.60.0

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 16% of August, with mostly cloudy or overcast conditions the remaining 64%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
14060
24258
34258
44258
54258
64159
74159
84258
94159
104060
114060
123961
133763
143763
153664
163565
173565
183466
193466
203367
213268
223169
233070
243070
253169
263169
273070
283070
292971
302971
312971

Chance of precipitation in August

Any precipitation

Ust’-Kut gets around 72 mm of rain over 11.3 wet days in August, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 37% and peaks near 40% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%40%50%151015202531
Rain chance (%)
131
231
332
432
532
633
734
834
935
1035
1136
1236
1336
1437
1537
1638
1738
1839
1939
2039
2139
2239
2339
2439
2539
2639
2739
2839
2940
3040
3140

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 78% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
159329
261318
361318
462308
564297
665287
767267
869256
969256
1071245
1173234
1273234
1375223
1475223
1576213
1678202
1778202
1880191
1981181
2082171
2183161
2284151
2387130
2488120
2589110
269190
279280
289370
299460
309550
319640

Wind in August

Winds average 7 km/h in August.

Across August, daily wind ranges from about 7 km/h on the calmest days to 8 km/h at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (km/h)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
248calm
258calm
268calm
278calm
288calm
298calm
308calm
318calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 16 hours at the start of August to 13 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 132 minutes over August. Sunrise moves from 5:02 AM to 6:04 AM, and sunset from 9:04 PM to 7:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
116.05:029:04
216.05:049:02
315.95:069:00
415.85:088:57
515.85:108:55
615.75:128:53
715.65:148:51
815.55:168:49
915.55:188:46
1015.45:208:44
1115.35:228:42
1215.35:248:39
1315.25:268:37
1415.15:288:34
1515.05:308:32
1615.05:328:30
1714.95:348:27
1814.85:378:25
1914.75:398:22
2014.65:418:19
2114.65:438:17
2214.55:458:14
2314.45:478:12
2414.35:498:09
2514.35:518:06
2614.25:538:04
2714.15:558:01
2814.05:577:58
2913.95:597:56
3013.96:027:53
3113.86:047:50

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 4.42 kWh/m².

For context, solar energy here swings from a low near 0.45 kWh/m² to a high of 5.9 kWh/m² in June across the year — August's 4.42 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
45.0Bright
55.0Bright
64.9Bright
74.9Bright
84.8Bright
94.8Bright
104.7Bright
114.7Bright
124.6Bright
134.6Bright
144.5Bright
154.5Bright
164.4Bright
174.3Bright
184.3Bright
194.2Bright
204.2Bright
214.1Bright
224.1Bright
234.0Bright
244.0Moderate
253.9Moderate
263.9Moderate
273.8Moderate
283.8Moderate
293.7Moderate
303.7Moderate
313.6Moderate
Planning a trip in August

Is August a good time to visit Ust’-Kut?

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

6.0
Sightseeing
2nd-best month of the year
3.4
Beach & pool
3rd-best month of the year

August is a reasonable time to visit Ust’-Kut for sightseeing.

What to pack for Ust’-Kut in August

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

In August, Ust’-Kut sees daytime highs around 20°C and nights near 9°C. Worth packing: rain gear. About 11 days see rain.

rain gear

UV index in Ust’-Kut in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Ust’-Kut peaks around June 21 at about 5 (high) — a little sun protection helps at midday. It bottoms out near December 19 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 5 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighModerateLowJun 21UV 5Dec 19UV 0
UV index (midday)Level
Jan0Low
Feb1Low
Mar2Low
Apr4Moderate
May5Moderate
Jun6High
Jul5High
Aug5Moderate
Sep3Moderate
Oct1Low
Nov0Low
Dec0Low

Air quality in Ust’-Kut in August

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Ust’-Kut is worst in July — around 56 µg/m³ PM2.5 (unhealthy), about 46.8× the cleanest month (December, 1 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecGoodPoorPoorModerateGoodJul 2155 µg/m³Dec 181 µg/m³
PM2.5 (µg/m³)Level
Jan2Good
Feb5Good
Mar5Good
Apr10Good
May11Good
Jun42Poor
Jul56Unhealthy
Aug52Poor
Sep39Poor
Oct16Moderate
Nov3Good
Dec1Good
Location & terrain

Where is Ust’-Kut?

Ust’-Kut sits at 56.8°N, 105.8°E, 285 m above sea level, in Russia. The nearest listed city is Zheleznogorsk-Ilimskiy, 104 km away.

Topography around Ust’-Kut

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ust’-Kut.

Within 3 km, the terrain around Ust’-Kut has significant variations in elevation — a maximum elevation change of 406 m around an average of 412 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 492 m; within 80 km, large variations in elevation — a maximum elevation change of 729 m.

The land around Ust’-Kut is covered by trees (72%) and artificial surfaces (21%) within 3 km, trees (93%) within 16 km, and trees (99%) within 80 km.

3 km
406 m
16 km
492 m
80 km
729 m
treesgrasslandartificial surfacesbare terrainwater
August weather nearby: Zheleznogorsk-Ilimskiy 104 km · Ust’-Ilimsk 230 km · Severobaykal’sk 254 km · Bratsk 267 km · Vikhorevka 293 km · Sayansk 375 km · Chunskiy 386 km · Zima 398 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 Ust’-Kut (56.7979°, 105.7866°, elevation 285 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).