Osan Weather in September

September in Osan averages 27°C (81°F) during the day and 17°C (63°F) at night. Quite a bit of rainfall is typical this month, with around 134 mm (5.3 in) on average. An umbrella is a good idea.

Rainfall in Osan in September

Based on our climate data of the past 30 years, about 8 days of rain are anticipated, with 134 mm (5.3 in) on average. When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.

Temperature in Osan in September

In September, Osan gets high temperatures, with highs of 27°C (81°F). Nights cool to around 17°C (63°F). This kind of day-to-night contrast is typical for this time of year. With lows of 17°C (63°F), nights are cool. If you're out after dark, an extra layer will keep you comfortable. The cooler air at night is also great for getting a good rest.

Sunshine in Osan in September

Expect a lot of sunshine this month, with about 197 hours of sun. These sunny conditions add to the overall experience.

Our weather planner can help you find worldwide destinations with pleasant weather during this period. May and October typically offer the best weather for Osan.