Bayanhongor weather in September

In September, Bayanhongor sees average daytime highs of 14°C and overnight lows near 1°C, with 20 mm of precipitation across 4 wet days and about 12.3 hours of daylight. It is the 5th-warmest and 5th-wettest month of the year here.

Highs ease over the month, from about 17°C in the first days to 11°C by the end. The sky is clear or mostly clear about 55% 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 Bayanhongor's 6th-clearest and 5th-windiest month. For the whole year in context, see Bayanhongor's year-round climate.

Daytime high
14°
5th warmest
Overnight low
9th coldest
Precipitation
20 mm
4 wet days
Daylight
12 h 18 min
7:02 AM – 7:21 PM
Cloud cover
40%
6th clearest
Wind
9 km/h
5th windiest
Solar energy
4.97 kWh/m²
Travel score
4.8
out of 10

Bayanhongor is city in Bayankhongor Province, Mongolia.

Density
483/km²
people per km²

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 17°C in the first days to 11°C by the end.

A typical September day in Bayanhongor reaches about 14°C in the afternoon and slips back to 1°C overnight — a 13°C spread between the day's warmth and the night's chill. On most days the high lands between 8°C and 19°C. Set against its neighbours, September runs about 6°C cooler than August and about 8°C warmer than October.

-10°10°20°151015202530
Avg high (°C)Avg low (°C)
1175
2175
3175
4174
5174
6164
7164
8163
9153
10153
11152
12152
13142
14142
15141
16141
17141
18131
19130
20130
21130
22120
2312-1
2412-1
2512-1
2611-1
2711-2
2811-2
2911-2
3010-2

How September really feels in Bayanhongor

Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 20 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
20
wind chill below the day's low

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

Bayanhongor weather by month

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

MonthHigh / Low (°C)Rainfall (mm)Wet daysSnow daysDaylight (hours)Travel score
Jan-13° / -25°10.40.88.80.0
Feb-9° / -22°311.4100.0
Mar-1° / -14°71.82.511.60.0
Apr / -5°143.52.813.31.4
May14° / 245.22.114.74.7
Jun20° / 398.20.315.56.4
Jul21° / 10°6210.8015.26.4
Aug20° / 447.90146.7
Sep14° / 2041.112.34.8
Oct / -7°92.22.110.70.8
Nov-4° / -16°30.91.59.20.0
Dec-11° / -22°20.60.98.50.0

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 55% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 16% of September, with mostly cloudy or overcast conditions the remaining 29%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
16436
26436
36436
46535
56535
66634
76733
86733
96931
106931
117030
127129
137129
147228
157327
167327
177426
187426
197426
207426
217525
227525
237525
247525
257525
267525
277525
287525
297525
307525

Chance of precipitation in September

Any precipitationSnow

Bayanhongor gets around 20 mm of rain and snow over 4 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 13% and peaks near 19% on the wettest days, and about 1 day brings snow. The odds ease toward the end of the month.

0%10%20%30%151015202530
Rain chance (%)Snow chance (%)
1191
2191
3182
4182
5182
6182
7173
8173
9163
10163
11154
12154
13144
14144
15134
16134
17124
18124
19114
20114
21114
22104
23104
2494
2594
2694
2784
2884
2984
3084

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 (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100

Wind in September

Winds average 9 km/h in September.

Across September, 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.

051015151015202530
Wind speed (km/h)Feels
19calm
29calm
39calm
49calm
59calm
69calm
79calm
89calm
99calm
109calm
119calm
129calm
139calm
149calm
159calm
169calm
179calm
189calm
199calm
209calm
219calm
229calm
239calm
249calm
259calm
269calm
279calm
289calm
299calm
309calm

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 6:42 AM to 7:20 AM, and sunset from 7:51 PM to 6:53 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
113.26:427:51
213.16:447:49
313.06:457:47
413.06:467:45
512.96:477:43
612.96:497:41
712.86:507:39
812.86:517:37
912.76:537:35
1012.76:547:33
1112.66:557:31
1212.56:577:29
1312.56:587:27
1412.46:597:25
1512.47:007:23
1612.37:027:21
1712.37:037:19
1812.27:047:17
1912.27:067:15
2012.17:077:13
2112.07:087:11
2212.07:107:09
2311.97:117:07
2411.97:127:05
2511.87:147:03
2611.87:157:01
2711.77:166:59
2811.67:186:57
2911.67:196:55
3011.57:206:53

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 4.97 kWh/m².

For context, solar energy here swings from a low near 1.78 kWh/m² to a high of 6.96 kWh/m² in June across the year — September's 4.97 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.4Bright
45.4Bright
55.4Bright
65.3Bright
75.3Bright
85.3Bright
95.2Bright
105.2Bright
115.2Bright
125.1Bright
135.1Bright
145.0Bright
155.0Bright
165.0Bright
174.9Bright
184.9Bright
194.9Bright
204.8Bright
214.8Bright
224.7Bright
234.7Bright
244.6Bright
254.6Bright
264.5Bright
274.5Bright
284.5Bright
294.4Bright
304.4Bright
Planning a trip in September

Is September a good time to visit Bayanhongor?

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

4.8
Sightseeing
4th-best month of the year
0.4
Beach & pool
5th-best month of the year

September is a reasonable time to visit Bayanhongor for sightseeing.

What to pack for Bayanhongor in September

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

In September, Bayanhongor sees daytime highs around 14°C and nights near 1°C. Worth packing: a warm layer and sun protection. About 4 days see rain.

a warm layersun protection

UV index in Bayanhongor in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Bayanhongor peaks around July 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 1 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecLowModerateHighVery highHighModerateLowJul 19UV 9Jan 1UV 1
UV index (midday)Level
Jan1Low
Feb2Moderate
Mar3Moderate
Apr6High
May7Very high
Jun7High
Jul9Very high
Aug8Very high
Sep6High
Oct3Moderate
Nov2Low
Dec1Low

Air quality in Bayanhongor 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 Bayanhongor is worst in June — around 18 µg/m³ PM2.5 (moderate), about 6.1× the cleanest month (December, 3 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodJun 1218 µg/m³Dec 184 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb8Good
Mar14Moderate
Apr14Moderate
May18Moderate
Jun18Moderate
Jul16Moderate
Aug17Moderate
Sep12Good
Oct9Good
Nov8Good
Dec3Good
Location & terrain

Where is Bayanhongor?

Bayanhongor sits at 46.2°N, 100.7°E, 1,873 m above sea level, in Mongolia. The nearest listed city is Tsetserleg, 153 km away.

TsetserlegArvayheerBogdHovdUliastayAltaiBulganMörön

Topography around Bayanhongor

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

Within 3 km, the terrain around Bayanhongor has significant variations in elevation — a maximum elevation change of 277 m around an average of 1,905 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 742 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,165 m.

The land around Bayanhongor is covered by grassland (53%) and bare terrain (35%) within 3 km, grassland (83%) within 16 km, and grassland (76%) and bare terrain (23%) within 80 km.

3 km
277 m
16 km
742 m
80 km
2,165 m
treesshrubsgrasslandartificial surfacesbare terrain
September weather nearby: Tsetserleg 153 km · Arvayheer 158 km · Bogd 204 km · Hovd 214 km · Uliastay 341 km · Altai 343 km · Bulgan 360 km · Mörön 385 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
Buddhist 52%no religion 41%Muslim 3%Shaman 3%

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 Bayanhongor (46.1944°, 100.7181°, elevation 1,873 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).