Arvayheer in Fall
In fall (September, October and November), Arvayheer sees average daytime highs around 7°C and overnight lows near -5°C, with 37 mm of precipitation over about 9 wet days across the season. It is the 3rd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 19°C in early September to -5°C by late November. The sky is clear or mostly clear about 57% of the time across fall, and the air most often feels dry.
Fall is Arvayheer's 3rd-best season to visit on our travel score. For the whole year in context, see Arvayheer's year-round climate.
- Avg daytime high
- 7°C
- 3rd-warmest season
- Avg overnight low
- -5°C
- Precipitation
- 37 mm
- 9 wet days
- Avg wind
- 11 km/h
- Travel score
- 2.4
- 3rd-best season
- Months
- Sep · Oct · Nov
Temperature in Arvayheer in Fall
Over the season highs ease from about 19°C in early September to -5°C by late November.
A typical fall day in Arvayheer reaches about 7°C and drops to -5°C overnight. The warmest of the three months is September, the coolest November.
How fall really feels in Arvayheer
Once humidity and wind are folded in, fall brings about 0 days that feel above 32°C and 77 that feel at or below 0°C.
The story in fall is cold — wind chill drags the overnight "feels like" below the raw low.
Arvayheer weather by month
How the three fall months (September, October and November) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | -10° / -22° | 1 | 0.3 | 0.8 | 8.8 | 0.0 |
| Feb | -6° / -19° | 3 | 0.9 | 1.2 | 10 | 0.0 |
| Mar | 1° / -12° | 7 | 2.2 | 2.9 | 11.6 | 0.0 |
| Apr | 9° / -4° | 13 | 4 | 3.1 | 13.3 | 2.2 |
| May | 16° / 2° | 27 | 5.9 | 2.1 | 14.7 | 5.3 |
| Jun | 21° / 9° | 43 | 8.4 | 0.2 | 15.5 | 6.6 |
| Jul | 23° / 12° | 62 | 11 | 0 | 15.2 | 6.6 |
| Aug | 21° / 10° | 50 | 9 | 0.1 | 14 | 6.7 |
| Sep | 16° / 3° | 23 | 5.2 | 1.1 | 12.3 | 5.6 |
| Oct | 8° / -5° | 10 | 2.7 | 2.5 | 10.7 | 1.7 |
| Nov | -2° / -13° | 4 | 1.2 | 1.7 | 9.2 | 0.0 |
| Dec | -8° / -19° | 2 | 0.4 | 0.9 | 8.5 | 0.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 57% of the time across fall.
Chance of precipitation in Fall
Arvayheer gets around 37 mm of rain and snow over 9 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 11 km/h across fall.
Sunrise & sunset in Fall
Daylight runs from about 13 h 12 min in early September to 8 h 42 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 3.5 kWh/m².
Is fall a good time to visit Arvayheer?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is a weaker month for outdoor sightseeing in Arvayheer.
What to pack for Arvayheer in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Arvayheer sees daytime highs around 7°C and nights near -5°C. Pack a warm layer and a heavy coat. Worth having: sun protection. About 9 days see rain.
UV index in Arvayheer in Fall
Clear-sky midday UV across fall averages 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 Arvayheer peaks around July 19 at about 9 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near January 10 at about 1 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 1 | 2 | 3 | 7 | 7 | 8 | 9 | 8 | 6 | 3 | 1 | 1 |
| Level | Low | Moderate | Moderate | High | Very high | Very high | Very high | Very high | High | Moderate | Low | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 1 | Low |
| Feb | 2 | Moderate |
| Mar | 3 | Moderate |
| Apr | 7 | High |
| May | 7 | Very high |
| Jun | 8 | Very high |
| Jul | 9 | Very high |
| Aug | 8 | Very high |
| Sep | 6 | High |
| Oct | 3 | Moderate |
| Nov | 1 | Low |
| Dec | 1 | Low |
Air quality in Arvayheer in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Arvayheer is worst in June — around 16 µg/m³ PM2.5 (moderate), about 6.2× the cleanest month (December, 3 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 6 | 7 | 11 | 11 | 13 | 16 | 16 | 16 | 9 | 7 | 6 | 3 |
| Level | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Good |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 6 | Good |
| Feb | 7 | Good |
| Mar | 11 | Good |
| Apr | 11 | Good |
| May | 13 | Moderate |
| Jun | 16 | Moderate |
| Jul | 16 | Moderate |
| Aug | 16 | Moderate |
| Sep | 9 | Good |
| Oct | 7 | Good |
| Nov | 6 | Good |
| Dec | 3 | Good |
Where is Arvayheer?
Arvayheer sits at 46.3°N, 102.8°E, 1,838 m above sea level, in Mongolia. The nearest listed city is Bayanhongor, 158 km away.
Topography around Arvayheer
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Arvayheer.
Within 3 km, the terrain around Arvayheer has only modest variations in elevation — a maximum elevation change of 231 m around an average of 1,849 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 748 m; within 80 km, very significant variations in elevation — a maximum elevation change of 1,823 m.
The land around Arvayheer is covered by grassland (77%) within 3 km, grassland (98%) within 16 km, and grassland (89%) within 80 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 Arvayheer (46.2639°, 102.775°, elevation 1,838 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.