Ganghwa-gun in Summer
In summer (June, July and August), Ganghwa-gun sees average daytime highs around 27°C and overnight lows near 21°C, with 675 mm of rain over about 38 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Over the season highs climb from about 24°C in early June to 28°C by late August. The sky is clear or mostly clear about 27% of the time across summer, and the air most often feels oppressive.
Summer is Ganghwa-gun's best season of the year to visit on our travel score. For the whole year in context, see Ganghwa-gun's year-round climate.
- Avg daytime high
- 27°C
- warmest season of the year
- Avg overnight low
- 21°C
- Rainfall
- 675 mm
- 38 wet days
- Avg wind
- 10 km/h
- Travel score
- 5.8
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Ganghwa-gun in Summer
Over the season highs climb from about 24°C in early June to 28°C by late August.
A typical summer day in Ganghwa-gun reaches about 27°C and drops to 21°C overnight. The warmest of the three months is August, the coolest June.
How summer really feels in Ganghwa-gun
Once humidity and wind are folded in, summer brings about 20 days that feel above 32°C and 0 that feel at or below 0°C.
The story in summer is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Ganghwa-gun weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 2° / -6° | 17 | 3.5 | 2.1 | 9.7 | 0.0 |
| Feb | 4° / -4° | 23 | 3.8 | 1.5 | 10.5 | 0.1 |
| Mar | 9° / 1° | 33 | 5.2 | 0.7 | 11.7 | 2.3 |
| Apr | 16° / 7° | 63 | 7 | 0 | 12.9 | 5.3 |
| May | 21° / 13° | 96 | 7.7 | 0 | 14 | 6.9 |
| Jun | 25° / 18° | 120 | 8.7 | 0 | 14.6 | 6.9 |
| Jul | 27° / 22° | 303 | 15.3 | 0 | 14.3 | 5.4 |
| Aug | 29° / 23° | 251 | 14.2 | 0 | 13.5 | 5.2 |
| Sep | 25° / 18° | 116 | 6.9 | 0 | 12.3 | 7.2 |
| Oct | 19° / 11° | 52 | 5.1 | 0 | 11 | 7.0 |
| Nov | 11° / 3° | 47 | 7.1 | 0.4 | 10 | 3.1 |
| Dec | 4° / -3° | 22 | 4.7 | 1.1 | 9.4 | 0.1 |
Cloud cover in Summer
The sky is clear or mostly clear about 27% of the time across summer.
Chance of precipitation in Summer
Ganghwa-gun gets around 675 mm of rain over 38 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 10 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 24 min in early June to 12 h 54 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 4.9 kWh/m².
Hazard calendar for Ganghwa-gun
In summer, Ganghwa-gun overlaps its pacific typhoon and rainy season season. The full year is below, with each hazard's peak months called out.
Ganghwa-gun sits in the Pacific typhoon belt; the season peaks July–October.
Ganghwa-gun's rainy season runs July–August, when most of the year's rain falls.
Is summer a good time to visit Ganghwa-gun?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Ganghwa-gun for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Ganghwa-gun in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Ganghwa-gun sees daytime highs around 27°C and nights near 21°C. Pack light clothes and rain gear. Worth having: sun protection. About 38 days see rain.
Sea temperature near Ganghwa-gun in Summer
The nearest coast averages about 21°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 17 km away) is warmest in August at about 24°C and coldest in February near 4°C.
It's comfortable for a long swim from Jul 7 to Oct 10 — about 3.2 months when the water holds above 20°C.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°C) | 5 | 4 | 5 | 8 | 13 | 17 | 21 | 24 | 23 | 19 | 14 | 9 |
| Comfort | Bracing | Bracing | Bracing | Bracing | Bracing | Cool | Refreshing | Warm | Refreshing | Cool | Bracing | Bracing |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 5 | Bracing |
| Feb | 4 | Bracing |
| Mar | 5 | Bracing |
| Apr | 8 | Bracing |
| May | 13 | Bracing |
| Jun | 17 | Cool |
| Jul | 21 | Refreshing |
| Aug | 24 | Warm |
| Sep | 23 | Refreshing |
| Oct | 19 | Cool |
| Nov | 14 | Bracing |
| Dec | 9 | Bracing |
UV index in Ganghwa-gun in Summer
Clear-sky midday UV across summer averages around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Ganghwa-gun peaks around July 22 at about 7 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near December 23 at about 2 (low).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 8 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 2 | 3 | 4 | 6 | 6 | 7 | 8 | 7 | 7 | 5 | 3 | 2 |
| Level | Low | Moderate | Moderate | High | High | High | Very high | Very high | High | Moderate | Moderate | Low |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 2 | Low |
| Feb | 3 | Moderate |
| Mar | 4 | Moderate |
| Apr | 6 | High |
| May | 6 | High |
| Jun | 7 | High |
| Jul | 8 | Very high |
| Aug | 7 | Very high |
| Sep | 7 | High |
| Oct | 5 | Moderate |
| Nov | 3 | Moderate |
| Dec | 2 | Low |
Air quality in Ganghwa-gun in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Ganghwa-gun is worst in March — around 160 µg/m³ PM2.5 (very unhealthy), about 2.0× the cleanest month (August, 81 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 145 | 149 | 160 | 127 | 111 | 98 | 88 | 81 | 110 | 132 | 142 | 133 |
| Level | Unhealthy | Unhealthy | Very unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy | Unhealthy |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 145 | Unhealthy |
| Feb | 149 | Unhealthy |
| Mar | 160 | Very unhealthy |
| Apr | 127 | Unhealthy |
| May | 111 | Unhealthy |
| Jun | 98 | Unhealthy |
| Jul | 88 | Unhealthy |
| Aug | 81 | Unhealthy |
| Sep | 110 | Unhealthy |
| Oct | 132 | Unhealthy |
| Nov | 142 | Unhealthy |
| Dec | 133 | Unhealthy |
Where is Ganghwa-gun?
Ganghwa-gun sits at 37.7°N, 126.5°E, 15 m above sea level, in South Korea. The nearest listed city is Gimpo-si, 24 km away.
Topography around Ganghwa-gun
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Ganghwa-gun.
Within 3 km, the terrain around Ganghwa-gun has only modest variations in elevation — a maximum elevation change of 227 m around an average of 38 m above sea level; within 16 km, significant variations in elevation — a maximum elevation change of 449 m; within 80 km, large variations in elevation — a maximum elevation change of 924 m.
The land around Ganghwa-gun is covered by trees (39%) and cropland (30%) within 3 km, cropland (31%), trees (30%) and water (23%) within 16 km, and water (33%) and trees (31%) within 80 km.
South Korea travel facts
- Travel advisory
- Level 1
- Exercise Normal Precautions
- Power plugs
- Type C / F
- 220 V · 60 Hz
- Prices
- ≈ 57% of US
- price level, 2025
- GDP per capita
- $36,227
- 2025
- Happiness
- 6.0 / 10
- World Happiness, 2025
- Safe drinking water
- 99%
- of population, 2024
- Homicide rate
- 0.5
- per 100k, 2023
- Road deaths
- 8.6
- per 100k/yr, 2019
- Income group
- High
- World Bank
- English
- Moderate
- EF EPI 522
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Ganghwa-gun (37.7472°, 126.4856°, elevation 15 m), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.