Siheung Weather in September
In Siheung, September brings high daytime temperatures around 26°C (79°F), with nights cooling to 18°C (64°F). Expect quite a bit of rainfall this month.
Rainfall in Siheung in September
You can expect rain on roughly 8 days based on historical data, averaging 131 mm (5.2 in) for the month. The rain this month tends to fall in heavier spells rather than light drizzle. When it rains, showers can be significant.
Temperature in Siheung in September
Siheung in September gets highs of 26°C (79°F) during the day and drops to 18°C (64°F) at night. This month falls in the summer season. Conditions stay fairly consistent through the month, making it easier to plan what to wear. At 18°C (64°F) overnight, it can feel quite a bit cooler after dark. Worth packing something warmer for evenings, but the cooler temperatures are ideal for sleeping.
Sunshine in Siheung in September
The days are predominantly sunny, with an estimated total of around 202 hours of sunshine. These sun-filled days are perfect for playing sports, visiting parks, or going for a bike ride.If you prefer enjoying temperate temperatures and rain-free days, May and October typically offer the best circumstances. If you're seeking pleasant, dry and sunny weather somewhere else in the world, our weather planner can help you explore other options.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Siheung's climate page.
Siheung Temperature in September
Min Temperature
18°C (64°F)
Max Temperature
26°C (79°F)
Chance of Rain
28%
Precipitation
131 mm (5.2 in)
Rainy days
8 days
Humidity
71% *
Sunshine
202 hours *
Percentage Sunshine
*
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Siheung typically drop from around 28°C (82°F) at the start of September to approximately 24°C (75°F) by the end. Nights are pleasant, with lows typically ranging from 13°C (55°F) to 20°C (68°F).
Average temperatures in September
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 September
Historical weather for Siheung in September
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 September
Based on weather observations in Siheung between 1976 and 2025, these are the recorded extremes during September.
- The hottest September day on record in Siheung reached 34°C (93°F) (September 11, 2024).
- The lowest daytime temperature in September was 16°C (61°F), recorded on September 26, 1987.
- The coldest night in September in Siheung was on September 27, 1987, with a minimum of 4°C (39°F).
Best Places in South Korea in September
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 September →
perfect weather
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tolerable
unpleasant
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What to Wear in Siheung in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). High rain levels are expected, so pack waterproof gear and an umbrella or poncho. You'll definitely want to pack sunglasses and sunscreen. There will be plenty of bright sunshine this month.What To Do in Siheung in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit South Korea, check out our Siheung's climate page.
Temperature Rainfall Sunshine Humidity
See the full Siheung climate overview or explore weather in South Korea.
