Last updated: August 28, 2025
In September, the average temperature in Ulaantolgoy, Mongolia hovers around 6°C (43°F). You can expect temperatures to fluctuate, with a minimum of -13°C (9°F) and a maximum reaching 22°C (72°F). On average, 22 mm (0.9 in) of precipitation falls over the course of 4 days, and the humidity sits at a comfortable 54%. This combination of weather factors makes for a unique climate experience!
In September in Ulaantolgoy, the average temperature is 6°C (43°F), with maximums reaching 22°C (72°F) and minimums dropping as low as -13°C (9°F). Be prepared for a wide range of temperatures when planning your trip!
In Ulaantolgoy in September, the precipitation amount is 22 mm (0.9 in) over a duration of 4 days.
In Ulaantolgoy in September, humidity is 54%. With an average temperature of 6°C (43°F), this humidity feels like a brisk chill in the air, making it refreshing yet slightly damp, which can be invigorating for exploring the surroundings but may require layering to stay comfortable while traveling.
In Ulaantolgoy in September, the maximum UV index is 7, which corresponds to the high Exposure Category. This means that the time to burn is approximately 25 minutes. For more detailed information, you can check the Hourly UV Index in Ulaantolgoy.
UV Risk Categories
Weather in Ulaantolgoy varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ulaantolgoy, focusing on differences in temperature, rainfall, humidity, and UV levels.
| Temperature | Precipitation | Humidity | UV | |
|---|---|---|---|---|
| January Weather | -23°C (-8°F) | 4 mm (0.2 inches) | 97% | low |
| February Weather | -19°C (-1°F) | 4 mm (0.2 inches) | 94% | moderate |
| March Weather | -8°C (17°F) | 11 mm (0.4 inches) | 87% | high |
| April Weather | 1°C (34°F) | 19 mm (0.7 inches) | 67% | very high |
| May Weather | 6°C (44°F) | 38 mm (1.5 inches) | 45% | very high |
| June Weather | 12°C (54°F) | 49 mm (1.9 inches) | 42% | very high |
| July Weather | 14°C (57°F) | 58 mm (2.3 inches) | 46% | very high |
| August Weather | 12°C (54°F) | 71 mm (2.8 inches) | 52% | very high |
| September Weather | 6°C (43°F) | 22 mm (0.9 inches) | 54% | high |
| October Weather | -3°C (28°F) | 7 mm (0.3 inches) | 63% | moderate |
| November Weather | -11°C (12°F) | 6 mm (0.2 inches) | 81% | moderate |
| December Weather | -20°C (-4°F) | 4 mm (0.1 inches) | 95% | low |