Ganghwa Temperature by Month
The average annual maximum temperature in Ganghwa, South Korea is 17°C (63°F), with daytime highs ranging from 3°C (37°F) in January to 30°C (86°F) in August. This page covers monthly averages, day-night differences, and how Ganghwa compares to cities worldwide.
Ganghwa Monthly Temperatures
Depending on the time of the year, temperatures range from very warm to cold in Ganghwa. Nighttime lows follow the same pattern, ranging from 23°C (73°F) to -6°C (21°F).
The chart below illustrates the average maximum day and minimum night temperatures in Ganghwa by month:
The coldest point of the day usually falls between 4 AM and 6 AM, with temperatures peaking around 3 PM. August, the city's warmest month, gets 192 hours of sunshine.
The chart below shows the average temperature throughout the year:
Temperature: Ganghwa vs South Korea
The map below shows the annual temperature across South Korea. You can also select individual months if you want to compare a specific time of year.
very warm
warm
pleasant
moderate
cold
very cold
Ganghwa vs World: Temperature Compared
Ganghwa's average annual maximum temperature is 17°C (63°F). To put that in context, here's how it compares to a few well-known destinations:
Seville, Spain averages 23°C (73°F) a year — one of the warmer cities in Western Europe, with long hot summers.
Reykjavík, Iceland averages 9°C (48°F) a year — mild summers by Icelandic standards, but cold winters and frequent wind.
Boston, USA averages 16°C (61°F) annually, with four distinct seasons and cold winters that rival northern Europe.
Melbourne, Australia averages 20°C (68°F) annually — known for unpredictable weather, with four seasons sometimes happening in one day.
What Does the Temperature Feel Like in Ganghwa?
Temperature alone doesn't tell the whole story — humidity plays a big role in how warm or cold it actually feels. High humidity in summer makes the heat feel more intense, particularly once temperatures climb above 25°C. In winter, the same humidity can make cold air feel sharper than the thermometer suggests.
In the cooler months, when temperatures drop below 10°C, high humidity makes the cold feel more cutting than it would in dry conditions.
In Ganghwa, January is the coolest month, with average highs of 3°C (37°F) and humidity around 60% — considered high. In August, the warmest month, temperatures average 30°C (86°F) with 80% humidity — conditions that feel very high. For a full picture, see our humidity page.
Climate temperature data is typically calculated as a 30-year average. This smooths out year-to-year variability and gives a more reliable picture of what a place is actually like, rather than what happened in any single unusual year.
The readings come from a range of sources — land-based weather stations, ocean buoys, ships, and satellites. That data is collected by weather services around the world, then pooled, quality-checked, and averaged to produce the climate records you see here.
For cities and regions with significant elevation, altitude is one of the biggest factors shaping local temperatures. As a rule of thumb, temperatures fall by around 6°C for every 1,000 metres gained — so a city at 2,000 metres will typically be around 12°C cooler than a city at sea level in the same region. Higher ground also tends to see more dramatic day-to-night temperature swings, since thinner air loses heat faster after sunset.
For more on Ganghwa's weather — including monthly rainfall, sunshine hours, and humidity — visit our Ganghwa climate page.
