Kostomuksha weather in September

In September, Kostomuksha sees average daytime highs of 12°C and overnight lows near 5°C, with 64 mm of precipitation across 11.5 wet days and about 12.7 hours of daylight. It is the 5th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 14°C in the first days to 9°C by the end. The sky is clear or mostly clear about 8% of the time in September, and the air most often feels dry.

Daylight stretches from about 14 h 24 min at the start of September to 11 h 06 min by month's end. Set against the rest of the year, September is Kostomuksha's 7th-clearest and 7th-windiest month. For the whole year in context, see Kostomuksha's year-round climate.

Daytime high: 12°; 5th warmest
Overnight low: 5°; 9th coldest
Precipitation: 64 mm; 11.5 wet days
Daylight: 12 h 42 min; 6:32 AM – 7:12 PM
Cloud cover: 79%; 7th clearest
Wind: 12 km/h; 7th windiest
Solar energy: 1.78 kWh/m²
Travel score: 2.7; out of 10

Kostomuksha is human settlement in Kostomuksha Municipal Okrug, Republic of Karelia, Russia.

Density: 2,009/km²; people per km²
Founded: 1977

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

← August Kostomuksha year-round climate October →Best places to visit in September

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 14°C in the first days to 9°C by the end.

A typical September day in Kostomuksha reaches about 12°C in the afternoon and slips back to 5°C overnight — a 6°C spread between the day's warmth and the night's chill. On most days the high lands between 7°C and 16°C. Set against its neighbours, September runs about 6°C cooler than August and about 7°C warmer than October.

	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
Avg high (°C)	15	15	14	14	14	14	13	13	13	13	13	12	12	12	12	11	11	11	11	10	10	10	10	10	9	9	9	9	8	8
Avg low (°C)	7	7	7	7	7	7	6	6	6	6	6	6	6	5	5	5	5	5	5	4	4	4	4	4	4	4	3	3	3	3

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

How September really feels in Kostomuksha

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 2 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 September is cold — wind chill drags the overnight "feels like" below the raw low.

Kostomuksha 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.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	-8° / -13°	32	9	10.9	4.7	0.0
Feb	-7° / -13°	26	7.8	9.7	7.8	0.0
Mar	-2° / -9°	31	8.4	10	11.2	0.0
Apr	5° / -4°	33	8.4	6	14.6	0.3
May	12° / 3°	58	11.3	2.6	18	2.8
Jun	17° / 8°	69	12.2	0.2	20.5	4.9
Jul	20° / 11°	81	13.4	0	19.4	5.5
Aug	17° / 9°	76	12.7	0	16.2	5.0
Sep	12° / 5°	64	11.5	0.3	12.7	2.7
Oct	4° / -0°	57	11.7	5.1	9.3	0.2
Nov	-1° / -5°	47	10.9	10.1	5.9	0.0
Dec	-5° / -10°	42	11	12.4	3.5	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 8% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 10% of September, with mostly cloudy or overcast conditions the remaining 82%.

	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
Clearer (%)	20	20	21	20	20	20	20	20	20	20	19	19	18	18	18	19	19	18	18	17	17	17	17	17	15	15	15	13	13	14
Cloudier (%)	80	80	79	80	80	80	80	80	80	80	81	81	82	82	82	81	81	82	82	83	83	83	83	83	85	85	85	87	87	86

	Clearer (%)	Cloudier (%)
1	20	80
2	20	80
3	21	79
4	20	80
5	20	80
6	20	80
7	20	80
8	20	80
9	20	80
10	20	80
11	19	81
12	19	81
13	18	82
14	18	82
15	18	82
16	19	81
17	19	81
18	18	82
19	18	82
20	17	83
21	17	83
22	17	83
23	17	83
24	17	83
25	15	85
26	15	85
27	15	85
28	13	87
29	13	87
30	14	86

Chance of precipitation in September

Any precipitationSnow

Kostomuksha gets around 64 mm of rain and snow over 11.5 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 39% and peaks near 41% on the wettest days, and about 0 day brings snow.

	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
Rain chance (%)	37	38	38	38	39	39	39	40	40	40	41	41	41	41	41	41	41	40	40	40	39	39	38	38	38	37	37	37	37	37
Snow chance (%)	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	2	2	2	3	3	3	4	4	5

	Rain chance (%)	Snow chance (%)
1	37	0
2	38	0
3	38	0
4	38	0
5	39	0
6	39	0
7	39	0
8	40	0
9	40	0
10	40	0
11	41	0
12	41	0
13	41	0
14	41	0
15	41	0
16	41	0
17	41	1
18	40	1
19	40	1
20	40	1
21	39	1
22	39	2
23	38	2
24	38	2
25	38	3
26	37	3
27	37	3
28	37	4
29	37	4
30	37	5

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 99% 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
Dry (%)	96	96	97	97	97	98	98	98	99	99	99	99	99	99	99	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100
Comfortable (%)	4	4	3	3	3	2	2	2	1	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	97	3
4	97	3
5	97	3
6	98	2
7	98	2
8	98	2
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

Wind in September

Winds average 12 km/h in September.

Across September, daily wind ranges from about 12 km/h on the calmest days to 13 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
Wind speed (km/h)	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	13	13	13	13	13	13	13	13	13	13	13	13
Feels	calm	calm	calm	calm	calm	calm	calm	calm	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze

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

Sunrise & sunset in September

DaylightNight

Daylight runs from about 14 h 24 min at the start of September to 11 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 198 minutes over September. Sunrise moves from 5:47 AM to 7:15 AM, and sunset from 8:08 PM to 6:19 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
Daylight (h)	14.4	14.2	14.1	14.0	13.9	13.8	13.7	13.6	13.4	13.3	13.2	13.1	13.0	12.9	12.8	12.7	12.5	12.4	12.3	12.2	12.1	12.0	11.9	11.7	11.6	11.5	11.4	11.3	11.2	11.1
Sunrise (AM)	5:47	5:50	5:53	5:56	5:59	6:02	6:05	6:08	6:11	6:14	6:17	6:20	6:23	6:26	6:29	6:32	6:36	6:39	6:42	6:45	6:48	6:51	6:54	6:57	7:00	7:03	7:06	7:09	7:12	7:15
Sunset (PM)	8:08	8:04	8:00	7:57	7:53	7:49	7:45	7:42	7:38	7:34	7:30	7:27	7:23	7:19	7:15	7:12	7:08	7:04	7:00	6:56	6:53	6:49	6:45	6:41	6:38	6:34	6:30	6:26	6:23	6:19

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	14.4	5:47	8:08
2	14.2	5:50	8:04
3	14.1	5:53	8:00
4	14.0	5:56	7:57
5	13.9	5:59	7:53
6	13.8	6:02	7:49
7	13.7	6:05	7:45
8	13.6	6:08	7:42
9	13.4	6:11	7:38
10	13.3	6:14	7:34
11	13.2	6:17	7:30
12	13.1	6:20	7:27
13	13.0	6:23	7:23
14	12.9	6:26	7:19
15	12.8	6:29	7:15
16	12.7	6:32	7:12
17	12.5	6:36	7:08
18	12.4	6:39	7:04
19	12.3	6:42	7:00
20	12.2	6:45	6:56
21	12.1	6:48	6:53
22	12.0	6:51	6:49
23	11.9	6:54	6:45
24	11.7	6:57	6:41
25	11.6	7:00	6:38
26	11.5	7:03	6:34
27	11.4	7:06	6:30
28	11.3	7:09	6:26
29	11.2	7:12	6:23
30	11.1	7:15	6:19

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 1.78 kWh/m².

For context, solar energy here swings from a low near 0.03 kWh/m² to a high of 5.04 kWh/m² in June across the year — September's 1.78 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
Solar energy (kWh/m²)	2.5	2.4	2.4	2.3	2.3	2.2	2.2	2.1	2.1	2.0	2.0	1.9	1.9	1.8	1.8	1.7	1.7	1.6	1.6	1.6	1.5	1.5	1.4	1.4	1.4	1.3	1.3	1.2	1.2	1.1
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim	Dim

	Solar energy (kWh/m²)	Level
1	2.5	Moderate
2	2.4	Moderate
3	2.4	Moderate
4	2.3	Moderate
5	2.3	Moderate
6	2.2	Moderate
7	2.2	Moderate
8	2.1	Moderate
9	2.1	Moderate
10	2.0	Moderate
11	2.0	Dim
12	1.9	Dim
13	1.9	Dim
14	1.8	Dim
15	1.8	Dim
16	1.7	Dim
17	1.7	Dim
18	1.6	Dim
19	1.6	Dim
20	1.6	Dim
21	1.5	Dim
22	1.5	Dim
23	1.4	Dim
24	1.4	Dim
25	1.4	Dim
26	1.3	Dim
27	1.3	Dim
28	1.2	Dim
29	1.2	Dim
30	1.1	Dim

Planning a trip in September

Is September a good time to visit Kostomuksha?

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

2.7

Sightseeing

5th-best month of the year

0.0

Beach & pool

5th-best month of the year

September is a weaker month for outdoor sightseeing in Kostomuksha.

What to pack for Kostomuksha in September

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

In September, Kostomuksha sees daytime highs around 12°C and nights near 5°C. Pack a warm layer. Worth having: rain gear. About 12 days see rain.

a warm layerrain gear

UV index in Kostomuksha in September

LowModerateHighVery highExtreme

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

Under clear skies, the midday UV index in Kostomuksha peaks around July 15 at about 5 (moderate) — a little sun protection helps at midday. It bottoms out near December 17 at about 0 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 4 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	0	0	1	2	4	4	5	4	2	1	0	0
Level	Low	Low	Low	Moderate	Moderate	Moderate	Moderate	Moderate	Low	Low	Low	Low

	UV index (midday)	Level
Jan	0	Low
Feb	0	Low
Mar	1	Low
Apr	2	Moderate
May	4	Moderate
Jun	4	Moderate
Jul	5	Moderate
Aug	4	Moderate
Sep	2	Low
Oct	1	Low
Nov	0	Low
Dec	0	Low

Location & terrain

Where is Kostomuksha?

Kostomuksha sits at 64.6°N, 30.6°E, 212 m above sea level, in Russia. The nearest listed city is Kajaani, 142 km away.

Topography around Kostomuksha

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

Within 3 km, the terrain around Kostomuksha has only modest variations in elevation — a maximum elevation change of 75 m around an average of 207 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 313 m; within 80 km, significant variations in elevation — a maximum elevation change of 312 m.

The land around Kostomuksha is covered by trees (69%) within 3 km, trees (76%) within 16 km, and trees (77%) within 80 km.

3 km

75 m

trees 69%

16 km

313 m

trees 76%

80 km

312 m

trees 77%

treesgrasslandartificial surfacesbare terrainwaterwetland

← August Kostomuksha year-round climate October →Best places to visit in September

September weather nearby: Kajaani 142 km · Iisalmi 199 km · Segezha 203 km · Kontiolahti 205 km · Siilinjärvi 218 km · Joensuu 223 km · Kuopio 235 km · Oulu 247 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 Kostomuksha (64.571°, 30.5767°, elevation 212 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. 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	15	7
2	15	7
3	14	7
4	14	7
5	14	7
6	14	7
7	13	6
8	13	6
9	13	6
10	13	6
11	13	6
12	12	6
13	12	6
14	12	5
15	12	5
16	11	5
17	11	5
18	11	5
19	11	5
20	10	4
21	10	4
22	10	4
23	10	4
24	10	4
25	9	4
26	9	4
27	9	3
28	9	3
29	8	3
30	8	3

	Clearer (%)	Cloudier (%)
1	20	80
2	20	80
3	21	79
4	20	80
5	20	80
6	20	80
7	20	80
8	20	80
9	20	80
10	20	80
11	19	81
12	19	81
13	18	82
14	18	82
15	18	82
16	19	81
17	19	81
18	18	82
19	18	82
20	17	83
21	17	83
22	17	83
23	17	83
24	17	83
25	15	85
26	15	85
27	15	85
28	13	87
29	13	87
30	14	86

	Rain chance (%)	Snow chance (%)
1	37	0
2	38	0
3	38	0
4	38	0
5	39	0
6	39	0
7	39	0
8	40	0
9	40	0
10	40	0
11	41	0
12	41	0
13	41	0
14	41	0
15	41	0
16	41	0
17	41	1
18	40	1
19	40	1
20	40	1
21	39	1
22	39	2
23	38	2
24	38	2
25	38	3
26	37	3
27	37	3
28	37	4
29	37	4
30	37	5

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	97	3
4	97	3
5	97	3
6	98	2
7	98	2
8	98	2
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

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

	Clearer (%)	Cloudier (%)
1	20	80
2	20	80
3	21	79
4	20	80
5	20	80
6	20	80
7	20	80
8	20	80
9	20	80
10	20	80
11	19	81
12	19	81
13	18	82
14	18	82
15	18	82
16	19	81
17	19	81
18	18	82
19	18	82
20	17	83
21	17	83
22	17	83
23	17	83
24	17	83
25	15	85
26	15	85
27	15	85
28	13	87
29	13	87
30	14	86

	Rain chance (%)	Snow chance (%)
1	37	0
2	38	0
3	38	0
4	38	0
5	39	0
6	39	0
7	39	0
8	40	0
9	40	0
10	40	0
11	41	0
12	41	0
13	41	0
14	41	0
15	41	0
16	41	0
17	41	1
18	40	1
19	40	1
20	40	1
21	39	1
22	39	2
23	38	2
24	38	2
25	38	3
26	37	3
27	37	3
28	37	4
29	37	4
30	37	5

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	97	3
4	97	3
5	97	3
6	98	2
7	98	2
8	98	2
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0

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

	Clearer (%)	Cloudier (%)
1	20	80
2	20	80
3	21	79
4	20	80
5	20	80
6	20	80
7	20	80
8	20	80
9	20	80
10	20	80
11	19	81
12	19	81
13	18	82
14	18	82
15	18	82
16	19	81
17	19	81
18	18	82
19	18	82
20	17	83
21	17	83
22	17	83
23	17	83
24	17	83
25	15	85
26	15	85
27	15	85
28	13	87
29	13	87
30	14	86

	Rain chance (%)	Snow chance (%)
1	37	0
2	38	0
3	38	0
4	38	0
5	39	0
6	39	0
7	39	0
8	40	0
9	40	0
10	40	0
11	41	0
12	41	0
13	41	0
14	41	0
15	41	0
16	41	0
17	41	1
18	40	1
19	40	1
20	40	1
21	39	1
22	39	2
23	38	2
24	38	2
25	38	3
26	37	3
27	37	3
28	37	4
29	37	4
30	37	5

	Dry (%)	Comfortable (%)
1	96	4
2	96	4
3	97	3
4	97	3
5	97	3
6	98	2
7	98	2
8	98	2
9	99	1
10	99	1
11	99	1
12	99	1
13	99	1
14	99	1
15	99	1
16	100	0
17	100	0
18	100	0
19	100	0
20	100	0
21	100	0
22	100	0
23	100	0
24	100	0
25	100	0
26	100	0
27	100	0
28	100	0
29	100	0
30	100	0