Last updated: August 28, 2025
In September, the average temperature in Bayan, Mongolia hovers around 12°C (54°F). Expect significant variability, with minimums dipping to -5°C (22°F) and maximums soaring as high as 33°C (91°F). During this month, anticipate 36 mm (1.4 in) of precipitation spread over roughly 6 days, contributing to an average humidity of 65%. Overall, it's a month of contrasts and mild comfort!
In September in Bayan, the average temperature is 12°C (54°F), with maximums reaching 33°C (91°F) and minimums dropping to as low as -5°C (22°F). Travelers should be prepared for a wide range of temperatures, ensuring they pack both warm and light clothing to enjoy their visit comfortably.
In Bayan in September, the total precipitation amount is 36 mm (1.4 in), which falls over the course of 6 days.
In Bayan in September, humidity is 65%. With an average temperature of 12°C (54°F), this humidity feels like a cool, damp embrace that can make outdoor activities a bit uncomfortable, but offers a refreshing atmosphere for exploring cozy cafes and indoor attractions.
In Bayan 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 Bayan.
UV Risk Categories
Weather in Bayan varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Bayan, focusing on differences in temperature, rainfall, humidity, and UV levels.
Temperature | Precipitation | Humidity | UV | |
---|---|---|---|---|
January Weather | -17°C (1°F) | 3 mm (0.1 inches) | 89% | low |
February Weather | -13°C (8°F) | 5 mm (0.2 inches) | 78% | moderate |
March Weather | -3°C (28°F) | 7 mm (0.3 inches) | 66% | moderate |
April Weather | 6°C (42°F) | 18 mm (0.7 inches) | 64% | high |
May Weather | 13°C (55°F) | 20 mm (0.8 inches) | 52% | very high |
June Weather | 18°C (66°F) | 49 mm (1.9 inches) | 59% | very high |
July Weather | 20°C (69°F) | 66 mm (2.6 inches) | 63% | very high |
August Weather | 17°C (64°F) | 74 mm (2.9 inches) | 62% | very high |
September Weather | 12°C (54°F) | 36 mm (1.4 inches) | 65% | high |
October Weather | 2°C (36°F) | 16 mm (0.6 inches) | 65% | moderate |
November Weather | -7°C (20°F) | 10 mm (0.4 inches) | 69% | low |
December Weather | -15°C (5°F) | 4 mm (0.2 inches) | 86% | low |