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Siheung Weather in May
Thinking of visiting Siheung in May? Expect pleasant temperatures reaching 21°C (70°F) during the day, dropping to 13°C (55°F) at night, and note that quite a bit of rainfall is likely.
Rainfall in Siheung in May
This month experiences about 8 days of rain according to historical data, averaging 99 mm (3.9 in). When showers do arrive, they tend to be on the heavier side. Worth being prepared even if rain days are not that numerous.
Temperature in Siheung in May
May is one of the better months to visit Siheung. Expect 21°C (70°F) during the day and 13°C (55°F) at night. The difference between afternoon and evening temperatures is usually noticeable. Nights drop to around 13°C (55°F), which is noticeably cooler than the daytime. A light jacket for the evening is a sensible addition, and the cool nights tend to make sleeping comfortable.
Sunshine in Siheung in May
The month enjoys around 242 hours of sunshine, creating mostly sunny days with good weather conditions.If you favor pleasant temperatures and minimal rainfall, May is one of the best months to visit Siheung.
Siheung Temperature in May
Min Temperature
13°C (55°F)
Max Temperature
21°C (70°F)
Chance of Rain
26%
Precipitation
99 mm (3.9 in)
Rainy days
8 days
Humidity
68% *
Sunshine
242 hours *
Percentage Sunshine
*
* Data from: Incheon, South Korea (13 KM, 8 Miles).
Siheung Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Siheung - and find the best time to visit.
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Siheung typically rise from around 22°C (72°F) at the start of May to approximately 25°C (77°F) by the end. Nights are cool, with lows typically ranging from 10°C (50°F) to 15°C (59°F).
Average temperatures in May
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in May
Historical weather records for Siheung in May
Browse day-by-day weather records for Siheung spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Siheung historical weather extremes in May
The extremes listed below come from historical weather data collected in Siheung from 1976 through 2026.
- The hottest May day on record in Siheung reached 32°C (90°F) (May 31, 2014).
- The lowest daytime temperature in May was 13°C (55°F), recorded on May 4, 1990.
- The coldest night in May in Siheung was on May 1, 2010, with a minimum of 3°C (37°F).
Best Places in South Korea in May
Find out more about the weather in South Korea and which places have the best travel conditions in this month. See all of South Korea in May →
perfect weather
pleasant
tolerable
unpleasant
poor
Perfect weather is subjective. On this map perfect weather has been defined with temperatures between 20°C (68°F) and 29°C (84°F) and not too much precipitation (less than 90 mm (3.5 in) a month).
What to Wear in Siheung in May
Pleasant temperatures in May mean you can pack light but flexibel pieces. Think cotton t-shirts, comfortable walking shorts, and one warmer layer for evenings. A light sweater or denim jacket works well. Prepare for significant rainfall with proper waterproof clothing and shoes. And with plenty of sunshine hours, don’t forget sunglasses, sunscreen, and maybe a sun hat.
What To Do in Siheung in May
We rated the following activities from 1 (least suitable) to 10 (best) to do.
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Cycling9/10 -
Walking9/10 -
Barbeque8/10 -
Camping8/10 -
Outdoor sports9/10
Siheung 3-Day Forecast
More climate data for Siheung
Temperature Rainfall Sunshine Humidity
See the full Siheung climate overview or explore weather in South Korea.
Popular in May
Where to go in May - average daytime high across popular destinations.
Seoul
24°C (75°F) Jeonju25°C (77°F) Suwon24°C (75°F) Gyeongju25°C (77°F) Seogwipo
22°C (72°F) Incheon21°C (70°F) Busan22°C (72°F) Jeju20°C (68°F) Bucket list
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