Öndörkhaan weather in September

In September, Öndörkhaan sees average daytime highs of 18°C and overnight lows near 5°C, with 26 mm of precipitation across 5.9 wet days and about 12.4 hours of daylight. It is the 5th-warmest and 4th-wettest month of the year here.

Highs ease over the month, from about 21°C in the first days to 14°C by the end. The sky is clear or mostly clear about 46% of the time in September, and the air most often feels dry.

Daylight stretches from about 13 h 12 min at the start of September to 11 h 30 min by month's end. Set against the rest of the year, September is Öndörkhaan's 6th-clearest and 4th-windiest month. For the whole year in context, see Öndörkhaan's year-round climate.

Daytime high: 18°; 5th warmest
Overnight low: 5°; 9th coldest
Precipitation: 26 mm; 5.9 wet days
Daylight: 12 h 18 min; 6:22 AM – 6:42 PM
Cloud cover: 46%; 6th clearest
Wind: 13 km/h; 4th windiest
Solar energy: 4.47 kWh/m²
Travel score: 6.3; out of 10

Öndörkhaan is capital of Khentii aimag and Kerlen Sum in Mongolia.

Density: 6/km²; people per km²

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

← August Öndörkhaan 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 21°C in the first days to 14°C by the end.

A typical September day in Öndörkhaan reaches about 18°C in the afternoon and slips back to 5°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 11°C and 25°C. Set against its neighbours, September runs about 6°C cooler than August and about 10°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)	22	21	21	21	21	20	20	20	20	19	19	19	19	18	18	18	18	17	17	17	17	16	16	16	15	15	15	14	14	14
Avg low (°C)	9	9	9	8	8	8	8	7	7	7	6	6	6	6	5	5	5	4	4	4	4	3	3	3	2	2	2	1	1	1

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

How September really feels in Öndörkhaan

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 9 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.

Öndörkhaan 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	-16° / -27°	1	0.4	0.8	8.7	0.0
Feb	-10° / -23°	3	0.9	1.2	9.9	0.0
Mar	0° / -13°	6	1.9	2	11.6	0.0
Apr	10° / -3°	11	2.9	2	13.3	2.8
May	18° / 4°	24	4.8	0.9	14.8	6.5
Jun	24° / 11°	44	7.7	0	15.7	7.1
Jul	26° / 14°	55	9.9	0	15.3	6.7
Aug	24° / 12°	53	8.3	0	14.1	7.2
Sep	18° / 5°	26	5.9	0.6	12.4	6.3
Oct	8° / -4°	13	3	2	10.6	1.8
Nov	-5° / -16°	5	1.8	2	9.1	0.0
Dec	-14° / -24°	2	0.8	1.1	8.3	0.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 46% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 36%. Skies tend to open up as the month goes on.

	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 (%)	61	61	62	62	62	63	63	64	64	65	66	66	66	66	66	66	66	66	66	65	65	65	64	64	64	64	64	64	64	64
Cloudier (%)	39	39	38	38	38	37	37	36	36	35	34	34	34	34	34	34	34	34	34	35	35	35	36	36	36	36	36	36	36	36

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	62	38
4	62	38
5	62	38
6	63	37
7	63	37
8	64	36
9	64	36
10	65	35
11	66	34
12	66	34
13	66	34
14	66	34
15	66	34
16	66	34
17	66	34
18	66	34
19	66	34
20	65	35
21	65	35
22	65	35
23	64	36
24	64	36
25	64	36
26	64	36
27	64	36
28	64	36
29	64	36
30	64	36

Chance of precipitation in September

Any precipitationSnow

Öndörkhaan gets around 26 mm of rain and snow over 5.9 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 19% and peaks near 24% on the wettest days, and about 1 day brings 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
Rain chance (%)	24	24	24	24	23	23	22	22	21	20	20	19	18	18	17	17	17	17	17	17	17	17	16	16	16	16	15	15	15	15
Snow chance (%)	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	2	2	2	2	3	3	3	4	4	4	4	5	5	5	5

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

	Dry (%)	Comfortable (%)
1	98	2
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
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 13 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	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13	13
Feels	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	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	light breeze
4	12	light breeze
5	12	light breeze
6	12	light breeze
7	12	light breeze
8	12	light breeze
9	13	light breeze
10	13	light breeze
11	13	light breeze
12	13	light breeze
13	13	light breeze
14	13	light breeze
15	13	light breeze
16	13	light breeze
17	13	light breeze
18	13	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 13 h 12 min at the start of September to 11 h 30 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 102 minutes over September. Sunrise moves from 6:01 AM to 6:41 AM, and sunset from 7:13 PM to 6:12 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)	13.2	13.1	13.1	13.0	13.0	12.9	12.9	12.8	12.7	12.7	12.6	12.6	12.5	12.5	12.4	12.3	12.3	12.2	12.2	12.1	12.0	12.0	11.9	11.9	11.8	11.8	11.7	11.6	11.6	11.5
Sunrise (AM)	6:01	6:03	6:04	6:05	6:07	6:08	6:09	6:11	6:12	6:13	6:15	6:16	6:18	6:19	6:20	6:22	6:23	6:24	6:26	6:27	6:29	6:30	6:31	6:33	6:34	6:35	6:37	6:38	6:40	6:41
Sunset (PM)	7:13	7:11	7:09	7:07	7:05	7:03	7:01	6:59	6:57	6:54	6:52	6:50	6:48	6:46	6:44	6:42	6:40	6:38	6:35	6:33	6:31	6:29	6:27	6:25	6:23	6:21	6:19	6:16	6:14	6:12

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	13.2	6:01	7:13
2	13.1	6:03	7:11
3	13.1	6:04	7:09
4	13.0	6:05	7:07
5	13.0	6:07	7:05
6	12.9	6:08	7:03
7	12.9	6:09	7:01
8	12.8	6:11	6:59
9	12.7	6:12	6:57
10	12.7	6:13	6:54
11	12.6	6:15	6:52
12	12.6	6:16	6:50
13	12.5	6:18	6:48
14	12.5	6:19	6:46
15	12.4	6:20	6:44
16	12.3	6:22	6:42
17	12.3	6:23	6:40
18	12.2	6:24	6:38
19	12.2	6:26	6:35
20	12.1	6:27	6:33
21	12.0	6:29	6:31
22	12.0	6:30	6:29
23	11.9	6:31	6:27
24	11.9	6:33	6:25
25	11.8	6:34	6:23
26	11.8	6:35	6:21
27	11.7	6:37	6:19
28	11.6	6:38	6:16
29	11.6	6:40	6:14
30	11.5	6:41	6:12

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.47 kWh/m².

For context, solar energy here swings from a low near 1.58 kWh/m² to a high of 6.51 kWh/m² in June across the year — September's 4.47 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)	5.0	5.0	5.0	4.9	4.9	4.9	4.8	4.8	4.8	4.7	4.7	4.7	4.6	4.6	4.5	4.5	4.5	4.4	4.4	4.3	4.3	4.2	4.2	4.1	4.1	4.0	4.0	4.0	3.9	3.9
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	5.0	Bright
2	5.0	Bright
3	5.0	Bright
4	4.9	Bright
5	4.9	Bright
6	4.9	Bright
7	4.8	Bright
8	4.8	Bright
9	4.8	Bright
10	4.7	Bright
11	4.7	Bright
12	4.7	Bright
13	4.6	Bright
14	4.6	Bright
15	4.5	Bright
16	4.5	Bright
17	4.5	Bright
18	4.4	Bright
19	4.4	Bright
20	4.3	Bright
21	4.3	Bright
22	4.2	Bright
23	4.2	Bright
24	4.1	Bright
25	4.1	Bright
26	4.0	Bright
27	4.0	Moderate
28	4.0	Moderate
29	3.9	Moderate
30	3.9	Moderate

Planning a trip in September

Is September a good time to visit Öndörkhaan?

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

6.3

Sightseeing

5th-best month of the year

2.2

Beach & pool

5th-best month of the year

September is a reasonable time to visit Öndörkhaan for sightseeing.

What to pack for Öndörkhaan in September

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

In September, Öndörkhaan sees daytime highs around 18°C and nights near 5°C. Worth packing: a warm layer. About 6 days see rain.

a warm layer

UV index in Öndörkhaan in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Öndörkhaan peaks around July 18 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 20 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	2	3	6	7	7	9	8	5	3	1	1
Level	Low	Low	Moderate	High	Very high	High	Very high	Very high	High	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	3	Moderate
Apr	6	High
May	7	Very high
Jun	7	High
Jul	9	Very high
Aug	8	Very high
Sep	5	High
Oct	3	Moderate
Nov	1	Low
Dec	1	Low

Location & terrain

Where is Öndörkhaan?

Öndörkhaan sits at 47.3°N, 110.7°E, 1,030 m above sea level, in Mongolia. The nearest listed city is Baruun-Urt, 211 km away.

Topography around Öndörkhaan

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

Within 3 km, the terrain around Öndörkhaan has only modest variations in elevation — a maximum elevation change of 21 m around an average of 1,031 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 242 m; within 80 km, large variations in elevation — a maximum elevation change of 719 m.

The land around Öndörkhaan is covered by grassland (79%) within 3 km, grassland (98%) within 16 km, and grassland (99%) within 80 km.

3 km

21 m

grassland 79%

16 km

242 m

grassland 98%

80 km

719 m

grassland 99%

grasslandcroplandartificial surfacesbare terrainwater

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

September weather nearby: Baruun-Urt 211 km · Nalayh 258 km · Saynshand 274 km · Dzuunmod 281 km · Zuunmod 281 km · Ulaanbaatar 290 km · Choibalsan 302 km · Dzüünharaa 355 km

Mongolia travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type C / E / F; 220 V · 50 Hz
Prices: ≈ 34% of US; price level, 2025
GDP per capita: $7,108; 2025
Happiness: 5.9 / 10; World Happiness, 2025
Safe drinking water: 43%; of population, 2024
Homicide rate: 5.9; per 100k, 2023
Road deaths: 21; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Very low; EF EPI 447
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 Öndörkhaan (47.3194°, 110.6556°, elevation 1,030 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	22	9
2	21	9
3	21	9
4	21	8
5	21	8
6	20	8
7	20	8
8	20	7
9	20	7
10	19	7
11	19	6
12	19	6
13	19	6
14	18	6
15	18	5
16	18	5
17	18	5
18	17	4
19	17	4
20	17	4
21	17	4
22	16	3
23	16	3
24	16	3
25	15	2
26	15	2
27	15	2
28	14	1
29	14	1
30	14	1

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	62	38
4	62	38
5	62	38
6	63	37
7	63	37
8	64	36
9	64	36
10	65	35
11	66	34
12	66	34
13	66	34
14	66	34
15	66	34
16	66	34
17	66	34
18	66	34
19	66	34
20	65	35
21	65	35
22	65	35
23	64	36
24	64	36
25	64	36
26	64	36
27	64	36
28	64	36
29	64	36
30	64	36

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

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

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	62	38
4	62	38
5	62	38
6	63	37
7	63	37
8	64	36
9	64	36
10	65	35
11	66	34
12	66	34
13	66	34
14	66	34
15	66	34
16	66	34
17	66	34
18	66	34
19	66	34
20	65	35
21	65	35
22	65	35
23	64	36
24	64	36
25	64	36
26	64	36
27	64	36
28	64	36
29	64	36
30	64	36

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

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

	Clearer (%)	Cloudier (%)
1	61	39
2	61	39
3	62	38
4	62	38
5	62	38
6	63	37
7	63	37
8	64	36
9	64	36
10	65	35
11	66	34
12	66	34
13	66	34
14	66	34
15	66	34
16	66	34
17	66	34
18	66	34
19	66	34
20	65	35
21	65	35
22	65	35
23	64	36
24	64	36
25	64	36
26	64	36
27	64	36
28	64	36
29	64	36
30	64	36

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

	Dry (%)	Comfortable (%)
1	98	2
2	99	1
3	99	1
4	99	1
5	99	1
6	99	1
7	99	1
8	99	1
9	99	1
10	99	1
11	100	0
12	100	0
13	100	0
14	100	0
15	100	0
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