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September Weather in Ongon, Mongolia

Last updated: August 28, 2025

In September, the average temperature in Ongon, Mongolia hovers around 11°C (52°F). Be prepared for a chill, as temperatures can dip to a brisk -6°C (21°F) or soar to a pleasant 29°C (85°F). You'll likely experience about 40 mm (1.6 in) of precipitation over 6 days, all while enjoying an average humidity level of 65%.

September Temperature in Ongon

In September in Ongon, the average temperature is 11°C (52°F). Maximum temperatures can reach 29°C (85°F), while minimums can drop to as low as -6°C (21°F). This wide temperature range means travelers should pack layers to accommodate both warm days and chilly nights.

September Weather in Ongon: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in Ongon, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Ongon, September typically has an average temperature of 11°C (52°F), with highs reaching up to 29°C (85°F) and lows dropping to around -6°C (21°F).
JanFebMarAprMayJunJulAugSepOctNovDec-252339516366615234170
Data source: Temperature data for Ongon generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

September Precipitation in Ongon

In Ongon in September, the precipitation amount is 40 mm (1.6 in) over the course of 6 days.

September Precipitation Trends in Ongon

The chart displays monthly precipitation patterns in Ongon, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In Ongon, September typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 6 days.
JanFebMarAprMayJunJulAugSepOctNovDec36716223352784015125
Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.
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September Humidity in Ongon

In Ongon in September humidity is 65%. With average temperature 11°C (52°F) this humidity feels like a cool, damp blanket wrapping around you, making outdoor adventures invigorating yet slightly uncomfortable, as you'll need to layer up to stay warm and dry while exploring.

September Average Humidity in Ongon

This chart illustrates the average monthly humidity levels in Ongon, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in Ongon is approximately 65%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%78%66%64%52%59%63%62%65%65%69%86%
Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in Ongon

In Ongon 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 Ongon.

Maximum UV Index Levels in Ongon for September

The chart shows the monthly maximum UV Index (UVI) for Ongon in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in Ongon typically reaches 7, which falls under the high exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2357910997532
Data source: Ongon September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How September Weather in Ongon Compares to Other Months

Weather in Ongon varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in Ongon, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Ongon, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-19°C (-2°F)3 mm (0.1 inches)89%low
February Weather-15°C (5°F)6 mm (0.2 inches)78%moderate
March Weather-5°C (24°F)7 mm (0.3 inches)66%moderate
April Weather4°C (39°F)16 mm (0.6 inches)64%high
May Weather11°C (52°F)22 mm (0.9 inches)52%very high
June Weather17°C (63°F)33 mm (1.3 inches)59%very high
July Weather19°C (67°F)52 mm (2.1 inches)63%very high
August Weather16°C (62°F)78 mm (3.1 inches)62%very high
September Weather11°C (52°F)40 mm (1.6 inches)65%high
October Weather1°C (34°F)15 mm (0.6 inches)65%moderate
November Weather-8°C (17°F)12 mm (0.5 inches)69%moderate
December Weather-18°C (1°F)5 mm (0.2 inches)86%low

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