The best times to visit Ganghwa for ideal weather are

April 30th to July 1st


August 27th to November 4th

based on average temperature and humidity from NOAA (the National Oceanic and Atmospheric Administration). Read below for more weather and travel details.



Other Ganghwa Travel Info

Weather in Ganghwa


Average temperatures in Ganghwa vary an incredible amount. Considering humidity, temperatures feel cold for about half of the year and otherwise nice with a low chance of precipitation most of the year. The area is less temperate than some — in the 37th percentile for pleasant weather — compared to tourist destinations worldwide. Weeks with ideal weather are listed above. If you’re looking for the very warmest time to visit Ganghwa, the hottest months are August, July, and then June. See average monthly temperatures below. The warmest time of year is generally early August where highs are regularly around 86.3°F (30.2°C) with temperatures rarely dropping below 72.9°F (22.7°C) at night.

Ganghwa Temperatures (Fahrenheit)


Ganghwa Temperatures (Celsius)


“Feels-Like” Temperatures

The way we experience weather isn’t all about temperature. Higher temperatures affect us much more at higher humidity, and colder temperatures feel piercing with high winds. Our perceived temperatures factor in humidity and wind chill to better represent how hot or cold the day feels to a person.

Ganghwa Perceived Temperature (F)


Ganghwa Perceived Temperature (C)



Average Ganghwa Temperatures by Month

Daily highs (averaged for the month) usually give the best indication of the weather. A significantly lower mean and low generally just means it gets colder at night.

Show Fahrenheit

Month Avg. High (°F) Avg. Mean (°F) Avg. Low (°F)
Jan 33.9 24.4 14.7
Feb 40.1 30.3 20.5
Mar 51.1 40.3 30.1
Apr 62.5 51.2 40.3
May 73.7 62.3 51.9
Jun 81.5 71.3 62.7
Jul 82.4 75.3 69.5
Aug 84.9 77.2 70.4
Sep 78.9 69.2 60.2
Oct 69.1 57.3 46.1
Nov 52.4 42.8 33.5
Dec 36.7 28.1 19.3

Show Celsius

Month Avg. High (°C) Avg. Mean (°C) Avg. Low (°C)
Jan 1.1 -4.2 -9.6
Feb 4.5 -0.9 -6.4
Mar 10.6 4.6 -1.1
Apr 16.9 10.7 4.6
May 23.2 16.8 11.1
Jun 27.5 21.8 17.1
Jul 28 24.1 20.8
Aug 29.4 25.1 21.3
Sep 26.1 20.7 15.7
Oct 20.6 14.1 7.8
Nov 11.3 6 0.8
Dec 2.6 -2.2 -7.1



Precipitation (Rain or Snow)

If dry weather is what you’re after, the months with the lowest chance of significant precipitation in Ganghwa are January, February, and then December. Note that we define “significant precipitation” as .1 inches or more in this section. The lowest chance of rain or snow occurs around early to mid January. For example, on the week of January 8th there are no days of precipitation on average. By contrast, it’s most likely to rain or snow in mid July with an average of 3 days of significant precipitation the week of July 16th.

When can you find snow in Ganghwa? Weather stations report a bit of annual snow likely to be deepest around January, especially close to mid December. The best time to ski (if at all) in Ganghwa is often around around December 17th when fresh powder is deepest. Please note that a value of 0 for snow in the graph below may either mean there was no snow, or that snow is unreported.

Chance of Precipitation

The graph below shows the % chance of rainy and snowy days in Ganghwa.

Days with precipitation

Snow on the Ground

The graph below shows the average snow on the ground in Ganghwa (in).

Snow depth

Average Rain and Snow by Month

Show Inches

Month Daily Chance of Rain Average Snow Depth (in) Total Precipitation (in)
Jan 4% 1.4 0.3
Feb 6% 0 1.3
Mar 10% 0 1.4
Apr 15% 0 2.3
May 16% 0 3.2
Jun 19% 0 4.4
Jul 37% 0 19.1
Aug 33% 0 11.8
Sep 14% 0 4.2
Oct 9% 0 1.4
Nov 17% 0 2.1
Dec 7% 0.8 1

Show Centimeters

Month Daily Chance of Rain Average Snow Depth (cm) Total Precipitation (cm)
Jan 4 3.6 0.8
Feb 6 0 3.3
Mar 10 0 3.6
Apr 15 0 5.8
May 16 0 8.1
Jun 19 0 11.2
Jul 37 0 48.5
Aug 33 0 30
Sep 14 0 10.7
Oct 9 0 3.6
Nov 17 0 5.3
Dec 7 2 2.5


Humidity and Wind

Ganghwa has some extremely humid months, with other comfortably humid months. The least humid month is March (55.2% relative humidity), and the most humid month is July (85.1%).

Wind in Ganghwa is usually calm. The windiest month is March, followed by April and May. March’s average wind speed of around 5.2 knots (6 MPH or 9.7 KPH) is considered “a light breeze.” Maximum sustained winds (the highest speed for the day lasting more than a few moments) are at their highest in mid March where average top sustained speeds reach 13.6 knots, which is considered a moderate breeze.

Relative Humidity (%)

The graph below shows the average % humidity by month in Ganghwa.

Avg. Relative Humidity


The graph below shows wind speed (max and average) in knots.

Max Sustained Wind
Average Daily Wind

Average Wind Speeds

Show Wind Speeds

All wind speeds are in knots. 1 knot = 1.15 MPH or 1.85 KPH.

Month Avg. Wind Avg. Wind Feel Sustained High Wind High Wind Feel
Jan 3.3 Barely noticeable 9.8 Gentle breeze
Feb 3.9 Barely noticeable 10.4 Gentle breeze
Mar 5.2 Light breeze 12.3 Gentle breeze
Apr 4.9 Light breeze 12 Significant breeze
May 4.6 Light breeze 10.7 Gentle breeze
Jun 4.5 Light breeze 9.9 Gentle breeze
Jul 4.5 Light breeze 9.9 Gentle breeze
Aug 4.3 Light breeze 9.7 Gentle breeze
Sep 3.5 Barely noticeable 8.8 Gentle breeze
Oct 3.6 Barely noticeable 9.1 Gentle breeze
Nov 4.2 Light breeze 10.7 Gentle breeze
Dec 4 Light breeze 10.1 Gentle breeze

Show Relative Humidity by Month

Month Avg. Relative Humidity
Jan 56.6%
Feb 55.9%
Mar 55.2%
Apr 60.4%
May 67.7%
Jun 73.3%
Jul 85.1%
Aug 78.4%
Sep 64.3%
Oct 63.4%
Nov 66.4%
Dec 60.2%


Is it Safe to Travel to Ganghwa?

Our best data indicates this area is generally safe. As of Dec 04, 2023 there are no travel advisories or warnings for South Korea; exercise normal security precautions. Check this page for any recent changes or regions to avoid: Travel Advice and Advisories. This advisory was last updated on Oct 30, 2023.


The Busiest and Least Crowded Months

The busiest month for tourism in Ganghwa, South Korea is April, followed by March and September. Prices for hotels and flights will be most expensive during these months, though you can save if you purchase well in advance. Tourists are unlikely to visit Ganghwa in July. Those willing to visit at these times will likely find it the least expensive month.

Estimated Tourism by Month


Most Popular Months to Visit

Tourists Seeking Accommodations

Tourism graph is based on Google searches for services used by tourists relative to the rest of the year. Tourism data for this area is somewhat extrapolated based on nearby areas. Displayed data is calculated relative to the peak, so a score of 56.7 in July means 56.7% of the tourists vs. April.



Overall Ganghwa Travel Experience by Season

Spring (March through May)

Humidity and temperatures combine to make this season feel moderately cold. Highs range from 78.2°F (25.7°C) and 45.9°F (7.7°C) with far warmer temperatures in the later months. Rain is somewhat common with 3 to 5 days of significant precipitation per month. Spring is the busiest for tourism, which makes it a good time for those looking for things to do.

Summer (June through August)

The middle-year months have very comfortable weather with high temperatures that are comfortable. These months see the most precipitation with 6 to 11 days of precipitation per month. June – August is the slowest season for tourism in Ganghwa, so lodging and other accommodations may cost less than usual.

Fall (September through November)

Fall daily highs range from 81.5°F (27.5°C) and 45.8°F (7.7°C), which will feel comfortable given the humidity and wind. It rains or snows a significant amount: 3 to 5 days per month. Tourism is fairly slow during these months due to the weather, so hotels may be lower priced.

Winter (December through February)

Weather is far too cold this time of year in Ganghwa to be enjoyable for warm weather travelers. The average high during this season is between 45.9°F (7.7°C) and 31.6°F (-0.2°C). On average, it rains or snows a smalll amount: 1 to 2 times per month. These times of year are the second busiest with tourists.


Best Times to TravelSouth Korea › Ganghwa, South Korea