Osan, Gyeonggi, South Korea Climate Change Severity

38
Moderate
The current climate change severity in Osan is Moderate, with a 23.6% improvement in the climate score compared to last 15 years. This suggests improved conditions, with more favorable environmental indicators and a reduction in negative impacts.
Data: Jan. to Sep. (Historical Vs 2025) - Weather Data Only
Low
020
Moderate
40
High
60
Very High
80
Extreme
100
°C (c)

Osan Weather Condition Changes (Historic Vs 2025)

2025
0%
0%
0%
0%
0%
0%
0%
0%
0%
0%
Historic
2025

Over the past 15 year(s), Osan temperature has changed by around +1.06%, and has experienced notable climate changes.

Sunny
Cloudy
Rainy
Snowy
Misty
Data: Jan. to Sep. (Historical Vs 2025)

Comparison of Weather Condition (Historic Vs 2025)

HistoricDays

Year 2025Days

Change

sunnySunny
6656
-15.1%
cloudyCloudy
7238
-47.2%
rainyRainy
9771
-26.8%
snowySnowy
16
500%
mistyMisty
04
100%

Disclaimer: Other weather conditions not shown may affect the total day count.

Climate Change Indicators:

Over the past 15 years, Osan has experienced measurable improvements in key climate parameters, contributing to the current severity score of 38 (within the Moderate severity category). This suggests improving climate conditions compared to previous years. Here’s a breakdown of the specific changes observed:

Severity Score

38/100

Moderate

Low
020
Moderate
40
High
60
Very High
80
Extreme
100

From 2010 to 2025, Osan experienced significant changes:

Temperature change of

+0.1 °C

Variation in annual rainfall

-3.8 %

Change in average humidity

-1.5 %

PM2.5 levels surged by

-17.3 %

Heatwave changed by

-4.2 day(s)

Coldwave changed by

+2.4 day(s)

Wind speeds changed by

+2.6 km/h

These indicators show reduced climate volatility, offering a valuable window to reinforce sustainable practices and strengthen long-term climate resilience. As the severity shifts toward Moderate, it is important to maintain momentum in climate adaptation efforts.

Check how we calculate Climate Change Severity
Based on data from Jan. to Sep.

Osan Weather Forecast 30 Days (October - November 2025)
Osan, Gyeonggi, South Korea

Condition
Temperature IconTemperature
Humidity Iconhumi.
Wind IconWind Speed
Sat. 4, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/18°
Humidity Icon84%
Wind Icon13km/h
Sun. 5, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon24°/20°
Humidity Icon84%
Wind Icon6km/h
Mon. 6, Oct.
heavy rainHeavy rain
Temperature Icon20°/17°
Humidity Icon92%
Wind Icon20km/h
Tue. 7, Oct.
heavy rainHeavy rain
Temperature Icon19°/17°
Humidity Icon93%
Wind Icon19km/h
Wed. 8, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon23°/18°
Humidity Icon87%
Wind Icon11km/h
Thu. 9, Oct.
partly cloudyPartly Cloudy
Temperature Icon26°/18°
Humidity Icon82%
Wind Icon8km/h
Fri. 10, Oct.
heavy rainHeavy rain
Temperature Icon21°/16°
Humidity Icon87%
Wind Icon25km/h
Sat. 11, Oct.
moderate rainModerate rain
Temperature Icon15°/14°
Humidity Icon83%
Wind Icon31km/h
Sun. 12, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon16°/14°
Humidity Icon74%
Wind Icon26km/h
Mon. 13, Oct.
patchy rain possiblePatchy rain nearby
Temperature Icon18°/15°
Humidity Icon89%
Wind Icon18km/h
Tue. 14, Oct.
partly cloudyPartly Cloudy
Temperature Icon23°/15°
Humidity Icon75%
Wind Icon13km/h
Wed. 15, Oct.
partly cloudyPartly Cloudy
Temperature Icon22°/15°
Humidity Icon71%
Wind Icon23km/h
Thu. 16, Oct.
heavy rainHeavy rain
Temperature Icon16°/15°
Humidity Icon94%
Wind Icon13km/h
Fri. 17, Oct.
sunnySunny
Temperature Icon22°/14°
Humidity Icon68%
Wind Icon16km/h
Sat. 18, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon19°/10°
Humidity Icon64%
Wind Icon12km/h
Sun. 19, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/10°
Humidity Icon68%
Wind Icon13km/h
Mon. 20, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/10°
Humidity Icon67%
Wind Icon13km/h
Tue. 21, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon20°/11°
Humidity Icon68%
Wind Icon13km/h
Wed. 22, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon19°/11°
Humidity Icon69%
Wind Icon15km/h
Thu. 23, Oct.
moderate rain at timesModerate rain at times
Temperature Icon19°/10°
Humidity Icon68%
Wind Icon15km/h
Fri. 24, Oct.
patchy rain possiblePatchy rain possible
Temperature Icon18°/10°
Humidity Icon66%
Wind Icon13km/h
Sat. 25, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon18°/9°
Humidity Icon65%
Wind Icon14km/h
Sun. 26, Oct.
moderate rain at timesModerate rain at times
Temperature Icon17°/9°
Humidity Icon67%
Wind Icon13km/h
Mon. 27, Oct.
moderate or heavy rain showerModerate or heavy rain shower
Temperature Icon17°/9°
Humidity Icon65%
Wind Icon14km/h
Tue. 28, Oct.
patchy rain possiblePatchy rain possible
Temperature Icon18°/9°
Humidity Icon64%
Wind Icon14km/h
Wed. 29, Oct.
moderate rain at timesModerate rain at times
Temperature Icon17°/9°
Humidity Icon62%
Wind Icon13km/h
Thu. 30, Oct.
patchy rain possiblePatchy rain possible
Temperature Icon17°/8°
Humidity Icon62%
Wind Icon12km/h
Fri. 31, Oct.
heavy rain at timesHeavy rain at times
Temperature Icon16°/8°
Humidity Icon67%
Wind Icon13km/h
Sat. 1, Nov.
moderate rain at timesModerate rain at times
Temperature Icon16°/9°
Humidity Icon66%
Wind Icon15km/h
Sun. 2, Nov.
moderate rain at timesModerate rain at times
Temperature Icon15°/8°
Humidity Icon62%
Wind Icon14km/h
Mon. 3, Nov.
moderate rain at timesModerate rain at times
Temperature Icon16°/8°
Humidity Icon64%
Wind Icon14km/h

Highest & Lowest Weather Forecasts

TemperatureTemperature

High will be onThu. 9, Oct.

26.1°C

Low will be onMon. 3, Nov.

7.5°C

HumidityHumidity

High will be onThu. 16, Oct.

94%

Low will be onWed. 29, Oct.

62%

Wind SpeedWind Speed

High will be onSat. 11, Oct.

30.6km/h

Low will be onSun. 5, Oct.

6.1km/h

PrecipitationPrecipitation

High will be onThu. 16, Oct.

32.5mm

Low will be onTue. 14, Oct.

0.02mm

Ultraviolet IndexUV

High will be onThu. 9, Oct.

6

Low will be onMon. 6, Oct.

0.1

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