Ulaanbaatar Weather in September
September in Ulaanbaatar brings moderate temperatures around 16°C (61°F) during the day, dropping to 2°C (36°F) at night, with some rainfall expected.
Rainfall in Ulaanbaatar in September
You can typically expect 9 days of rain this month, averaging around 43 mm (1.7 in). Neither particularly heavy nor particularly frequent, the rain this month is about average. A light jacket should be enough on most wet days.
Temperature in Ulaanbaatar in September
In September, expect moderate temperatures in Ulaanbaatar, with highs of 16°C (61°F) and lows of 2°C (36°F) at night. The difference between afternoon and evening temperatures is usually noticeable. With lows around 2°C (36°F), nights are cold. The upside is that cool, crisp nights are often the best for a deep sleep.
Sunshine in Ulaanbaatar in September
The days are predominantly sunny, with an estimated total of around 247 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.For Ulaanbaatar itself, June, July and August generally stand out with the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Mongolia, check out our Ulaanbaatar's climate page.
Ulaanbaatar Temperature in September
Min Temperature
2°C (36°F)
Max Temperature
16°C (61°F)
Chance of Rain
29%
Precipitation
43 mm (1.7 in)
Rainy days
9 days
Humidity
60%
Sunshine
247 hours
Percentage Sunshine
Daily Historical Temperatures
49-year average (1976-2025)
Based on our historical records, temperatures in Ulaanbaatar typically drop from around 19°C (66°F) at the start of September to approximately 13°C (55°F) by the end. Nights are cold, with lows typically ranging from -1°C (30°F) to 7°C (45°F).
Average temperatures in September
Daily Historical Precipitation
49-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Ulaanbaatar in September
Browse day-by-day weather records for Ulaanbaatar spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Ulaanbaatar historical weather extremes in September
Our historical data for Ulaanbaatar spans 1994 to 2025, revealing these weather extremes.
- On September 5, 2023, temperatures climbed to 31°C (88°F), marking the warmest September day on record.
- Ulaanbaatar registered its coldest September night on September 18, 2002, with temperatures dropping to -13°C (9°F).
- Peak precipitation in September occurred on September 4, 2021, when 28 mm (1.1 in) of precipitation was measured.
Best Places in Mongolia in September
Find out more about the weather in Mongolia and which places have the best travel conditions in this month. See all of Mongolia in September →
perfect weather
pleasant
tolerable
unpleasant
poor
What to Wear in Ulaanbaatar in September
Comfortable temperatures call for an easy wardrobe in September. Pack summer basics like t-shirts and shorts, but include a light jacket for cooler moments. A pair of comfortable walking shoes is essential. Wet weather is likely, so pack waterproof gear for multiple rainy days. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Ulaanbaatar in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Mongolia, check out our Ulaanbaatar's climate page.
Temperature Rainfall Sunshine Humidity
See the full Ulaanbaatar climate overview or explore weather in Mongolia.
