Ganghwa Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Ganghwa.
Climate overview of Ganghwa
Ganghwa, South Korea, sees big temperature differences between seasons, with August peaking at 30°C (86°F) and January dropping to 3°C (37°F).
Rain/snowfall is high, totalling around 1190 mm (47 in) per year. July is the wettest month and January the driest. The city also experiences a distinct dry season from December to March, with very warm summers and cold winters. May is the sunniest month, averaging 8.1 hours of sunshine per day.
Ganghwa Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Ganghwa - and find the best time to visit.
Monthly Temperature in Ganghwa
Visitors to Ganghwa can expect significant temperature changes throughout the year. Average maximum daytime temperatures range from a very warm 30°C (86°F) in August, the warmest time of the year, to a chilly 3°C (37°F) during cooler months like January.
At night, you can expect temperatures ranging from 23°C (73°F) in August to around -6°C (21°F) during January.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Ganghwa
Ganghwa is known for its substantial rain/snowfall, with annual precipitation reaching 1190 mm (47 in). Significant seasonal changes in precipitation occur throughout the year. In the wettest month, July it receives heavy rainfall, averaging 308 mm (12 in) of precipitation, recorded across 15 rainy days. In contrast, the driest month January brings less snow/rainfall, with 19 mm (0.7 in) over 6 snowy/rainy days. For more details, please visit our Ganghwa Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Ganghwa
While the amount of sunshine in Ganghwa varies throughout the year, all seasons offer their own charm. Enjoy up to 8.1 hours of daily sun in May, and experience slightly darker atmosphere in July, with about 5.4 hours of daily sunlight.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Daily hours of sunshine
Humidity in Ganghwa by Month
The relative humidity is high throughout the year in Ganghwa.
The city experiences its highest humidity in July, reaching 82%. In January, the humidity drops to its lowest level at 60%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Best Time to Visit Ganghwa
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
- Best overall: May and October
- Warmest weather: July and August
- Most sunshine: May
- Fewer rainy days: January, February, March, October and December
- Wettest months: June, July and August, when rainfall is highest.
- Seasonal pattern: A distinct dry season from December to March, with very warm summers and cold winters
- Coldest conditions: January, with freezing nights around -6°C (21°F).
Frequently asked questions about the climate in Ganghwa
What is the best time to visit Ganghwa?
May and October typically offer the most optimal weather in Ganghwa. In contrast, January, July and August tend to have less optimal conditions. Ganghwa has a distinct dry season from December to March, with very warm summers and cold winters.
What temperatures can I expect in Ganghwa?
Daytime highs range from 3°C (37°F) in January to 30°C (86°F) in August. Nighttime lows range from -6°C (21°F) to 23°C (73°F). Temperatures vary considerably through the year.
How much rain does Ganghwa get?
Annual rainfall is around 1190 mm (47 in). July is the wettest month with 308 mm (12 in), while January is the driest with 19 mm (0.7 in).
How sunny is Ganghwa?
Ganghwa receives around 2,397 hours of sunshine per year. May is the sunniest month with 242 hours, while July is the cloudiest with just 161 hours. Overall, Ganghwa enjoys abundant sunshine.
Ganghwa 3-Day Forecast
Ganghwa on the map
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