The biggest temperature swing occurs between October and November, as typical highs shift from 18.7°C / 65.7°F to 10.9°C / 51.6°F (about 7.8°C / 14.1°F).
| Month | Low Temperature | High Temperature | Category |
|---|---|---|---|
| January | -7°C | 1.6°C | COLD |
| February | -4.8°C | 4.7°C | COLD |
| March | -0.4°C | 10.4°C | COOL |
| April | 5.7°C | 16.9°C | MILD |
| May | 11.6°C | 22.2°C | WARM |
| June | 17.3°C | 26.5°C | WARM |
| July | 21.6°C | 28.2°C | WARM |
| August | 22.2°C | 28.8°C | WARM |
| September | 16.7°C | 24.9°C | WARM |
| October | 9.2°C | 18.7°C | MILD |
| November | 1.9°C | 10.9°C | COOL |
| December | -4.9°C | 3.4°C | COLD |
August has the warmest typical feels-like highs (33°C / 91.4°F), while January is coolest (-3.1°C / 26.4°F).
| Month | Low Feels Like | High Feels Like | Category |
|---|---|---|---|
| January | -11.6°C | -3.1°C | COLD |
| February | -9.3°C | 0.3°C | COLD |
| March | -4.3°C | 6.9°C | COLD |
| April | 3°C | 14.8°C | COOL |
| May | 10.4°C | 21.9°C | MILD |
| June | 18.4°C | 28.4°C | WARM |
| July | 24.7°C | 32.1°C | HOT |
| August | 25.6°C | 33°C | HOT |
| September | 17.4°C | 26.4°C | WARM |
| October | 7.4°C | 17.5°C | MILD |
| November | -1.6°C | 7.9°C | COLD |
| December | -9.4°C | -0.9°C | COLD |
July is wettest at 318.9 mm / 12.56 inches, while January is driest at 19.2 mm / 0.76 inches.
| Month | Baseline | Rainfall | Category |
|---|---|---|---|
| January | -100.7 mm | 19.2 mm | DRY |
| February | -100.7 mm | 23.3 mm | LIGHT |
| March | -100.7 mm | 41.3 mm | LIGHT |
| April | -100.7 mm | 69.8 mm | MODERATE |
| May | -100.7 mm | 99.3 mm | MODERATE |
| June | -100.7 mm | 135.8 mm | WET |
| July | -100.7 mm | 318.9 mm | VERY WET |
| August | -100.7 mm | 276 mm | VERY WET |
| September | -100.7 mm | 127.8 mm | WET |
| October | -100.7 mm | 61.8 mm | MODERATE |
| November | -100.7 mm | 48.8 mm | LIGHT |
| December | -100.7 mm | 21.4 mm | LIGHT |
June has the strongest peak UV (around index 8.1).
| Month | Baseline | UV Index | Category |
|---|---|---|---|
| January | 0 | 3.5 | MODERATE |
| February | 0 | 4.8 | MODERATE |
| March | 0 | 6.4 | HIGH |
| April | 0 | 7.5 | HIGH |
| May | 0 | 8 | VERY HIGH |
| June | 0 | 8.1 | VERY HIGH |
| July | 0 | 8.1 | VERY HIGH |
| August | 0 | 7.8 | HIGH |
| September | 0 | 6.9 | HIGH |
| October | 0 | 5.5 | MODERATE |
| November | 0 | 4 | MODERATE |
| December | 0 | 3 | LOW-MOD |
Daylight ranges from 9.6h in December to 14.7h in June.
| Month | Baseline | Daylight Hours | Category |
|---|---|---|---|
| January | 0h | 9.9h | SHORT |
| February | 0h | 10.8h | BALANCED |
| March | 0h | 12h | BALANCED |
| April | 0h | 13.2h | LONG |
| May | 0h | 14.2h | LONG |
| June | 0h | 14.7h | LONG |
| July | 0h | 14.5h | LONG |
| August | 0h | 13.6h | LONG |
| September | 0h | 12.4h | BALANCED |
| October | 0h | 11.2h | BALANCED |
| November | 0h | 10.2h | BALANCED |
| December | 0h | 9.6h | SHORT |
July is most humid (84.3%), while January is driest (59.9%).
| Month | Baseline | Humidity (avg) | Category |
|---|---|---|---|
| January | 51.3% | 59.9% | COMFORTABLE |
| February | 51.3% | 61.4% | COMFORTABLE |
| March | 51.3% | 65.9% | HUMID |
| April | 51.3% | 67.2% | HUMID |
| May | 51.3% | 71.5% | HUMID |
| June | 51.3% | 75% | MUGGY |
| July | 51.3% | 84.3% | MUGGY |
| August | 51.3% | 83.4% | MUGGY |
| September | 51.3% | 77.4% | MUGGY |
| October | 51.3% | 73% | HUMID |
| November | 51.3% | 71.1% | HUMID |
| December | 51.3% | 63.6% | COMFORTABLE |
March has the strongest typical average wind (10.3 km/h / 6.4 mph), while September is calmest (8.0 km/h / 5.0 mph).
| Month | Baseline | Wind (avg) | Category |
|---|---|---|---|
| January | 7.1 km/h | 9.5 km/h | CALM |
| February | 7.1 km/h | 9.8 km/h | CALM |
| March | 7.1 km/h | 10.3 km/h | CALM |
| April | 7.1 km/h | 10.2 km/h | CALM |
| May | 7.1 km/h | 9.4 km/h | CALM |
| June | 7.1 km/h | 8.1 km/h | CALM |
| July | 7.1 km/h | 9 km/h | CALM |
| August | 7.1 km/h | 8.4 km/h | CALM |
| September | 7.1 km/h | 8 km/h | CALM |
| October | 7.1 km/h | 8.3 km/h | CALM |
| November | 7.1 km/h | 9 km/h | CALM |
| December | 7.1 km/h | 9.2 km/h | CALM |
March is windiest by P95 gust signal (55.8 km/h / 34.7 mph).
| Month | Baseline | Wind (gusts) | Category |
|---|---|---|---|
| January | 0 km/h | 48.6 km/h | WINDY |
| February | 0 km/h | 51.5 km/h | VERY WINDY |
| March | 0 km/h | 55.8 km/h | VERY WINDY |
| April | 0 km/h | 55.4 km/h | VERY WINDY |
| May | 0 km/h | 51.5 km/h | VERY WINDY |
| June | 0 km/h | 44.3 km/h | WINDY |
| July | 0 km/h | 49.3 km/h | WINDY |
| August | 0 km/h | 46.4 km/h | WINDY |
| September | 0 km/h | 41.4 km/h | WINDY |
| October | 0 km/h | 46.1 km/h | WINDY |
| November | 0 km/h | 48.2 km/h | WINDY |
| December | 0 km/h | 46.4 km/h | WINDY |
July has the most rain days (~20.5), while February has the fewest (~5). Rain days count the average number of days in a month with measurable rain (about 0.1 mm or more).
| Month | Baseline | Rain Days | Category |
|---|---|---|---|
| January | -1.2 days | 5.4 days | SOME |
| February | -1.2 days | 5 days | SOME |
| March | -1.2 days | 8.5 days | SOME |
| April | -1.2 days | 8.6 days | SOME |
| May | -1.2 days | 9.5 days | FREQUENT |
| June | -1.2 days | 11.5 days | FREQUENT |
| July | -1.2 days | 20.5 days | VERY FREQUENT |
| August | -1.2 days | 19.2 days | VERY FREQUENT |
| September | -1.2 days | 10.5 days | FREQUENT |
| October | -1.2 days | 7.1 days | SOME |
| November | -1.2 days | 8.9 days | SOME |
| December | -1.2 days | 6.7 days | SOME |
July has the most heavy rain/washout risk days (~10). Heavy rain days are the average number of days likely to bring stronger downpours that can disrupt outdoor plans.
| Month | Baseline | Heavy Rain Days | Category |
|---|---|---|---|
| January | 0 days | 1 days | OCCASIONAL |
| February | 0 days | 1 days | OCCASIONAL |
| March | 0 days | 3 days | FREQUENT |
| April | 0 days | 4 days | FREQUENT |
| May | 0 days | 5 days | FREQUENT |
| June | 0 days | 5 days | FREQUENT |
| July | 0 days | 10 days | PERSISTENT |
| August | 0 days | 10 days | PERSISTENT |
| September | 0 days | 5 days | FREQUENT |
| October | 0 days | 3 days | FREQUENT |
| November | 0 days | 3 days | FREQUENT |
| December | 0 days | 1 days | OCCASIONAL |
August has the highest heat-risk day count (~3 days). Heat days are the average number of days that exceed our location-specific heat-risk threshold.
| Month | Baseline | Heat Days | Category |
|---|---|---|---|
| January | 0 days | 0 days | LOW |
| February | 0 days | 0 days | LOW |
| March | 0 days | 0 days | LOW |
| April | 0 days | 0 days | LOW |
| May | 0 days | 0 days | LOW |
| June | 0 days | 0 days | LOW |
| July | 0 days | 2 days | ELEVATED |
| August | 0 days | 3 days | ELEVATED |
| September | 0 days | 0 days | LOW |
| October | 0 days | 0 days | LOW |
| November | 0 days | 0 days | LOW |
| December | 0 days | 0 days | LOW |
Daylight varies from 9.6 hours in December (winter) to 14.7 hours in June (summer), which is a difference of 5.1 hours.
Northern Hemisphere seasons shape the weather patterns throughout the year. Here's what to expect in each season:
| Ranking Goal | #1 | #2 | #3 | #4 |
|---|---|---|---|---|
| Lowest rain risk | Jan 1 risk days | Feb 1 risk days | Dec 1 risk days | Mar 3 risk days |
| Lowest heatwave risk | Jan 0 risk days | Feb 0 risk days | Mar 0 risk days | Apr 0 risk days |
| Lowest cold risk | Jun 0 risk days | Jul 0 risk days | Aug 0 risk days | Sep 0 risk days |
| Lowest wind disruption risk | Sep 41 km/h | Jun 44 km/h | Oct 46 km/h | Aug 46 km/h |
| Most comfortable evenings | Jun 83 / 100 | Sep 80 / 100 | May 59 / 100 | Oct 50 / 100 |
| Best outdoor reliability | Dec 93 / 100 | Jan 90 / 100 | Feb 86 / 100 | Oct 83 / 100 |
Click any month for detailed weather information and packing advice.
Get personalized month rankings based on weather comfort, outdoor activity suitability, and seasonal conditions.
View Best Time to VisitThe best months to visit Seoul depend on your preferences. For warm weather, August is typically the warmest month. For dry conditions, January, December, February tend to have the least rainfall. Consider your priorities, and whether you prefer warmer temperatures, drier weather, or longer daylight hours.
August is typically the warmest month in Seoul, with average high temperatures reaching around 29°C (84°F). This is peak summer weather, ideal for outdoor activities and sightseeing.
January is usually the coldest month, with average low temperatures dropping to around -7°C (19°F). Pack warm layers if visiting during this time, especially for evening activities.
July typically sees the most rainfall in Seoul, averaging around 319mm (12.6 inches). It's wise to pack waterproof layers and have some indoor backup plans if you're visiting during this month.
January is typically the driest month, with average rainfall of just 19mm (0.7 inches). This makes it an excellent time for outdoor exploration and activities with minimal risk of rain disruption.
Temperatures in Seoul range from average lows of 7°C (45°F) to highs of 16°C (62°F). This variation means you'll want to pack differently depending on when you visit, as layers are key for adapting to the seasonal changes.
Yes, sun protection is important in Seoul. UV levels can reach 8 during peak months, which is considered very high. Pack sunscreen (SPF 30+), sunglasses, and a hat, especially if you'll be outdoors for extended periods.