Early summer heat will persist through this weekend, with daytime highs in inland areas approaching 30 degrees Celsius.
According to the Korea Meteorological Administration (KMA), morning lows on Saturday, the 18th, are expected to range from 7 to 15 degrees Celsius, while daytime highs will reach 19 to 28 degrees.
Projected lows and highs for major cities are as follows: Seoul, 10°C and 27°C; Incheon, 10°C and 24°C; Daejeon, 10°C and 26°C; Gwangju, 14°C and 25°C; Daegu, 13°C and 26°C; Ulsan, 14°C and 23°C; and Busan, 15°C and 20°C.
On Sunday, the 19th, morning lows will range from 10 to 15 degrees, with daytime highs reaching 18 to 29 degrees.
Large daily temperature swings will continue for the time being. The KMA projects that gaps between daytime and nighttime temperatures will be around 15 degrees, as daytime temperatures climb high and radiational cooling occurs actively overnight. In central inland regions, the daily temperature range could widen to around 20 degrees.
However, Jeju is expected to see 5 to 10 millimeters of rain return between Saturday afternoon and Sunday morning.
Rain is also forecast for North Jeolla and North Gyeongsang in the early hours of the 18th, and for South Jeolla and South Gyeongsang through Saturday morning. Additional expected rainfall amounts are: Busan, Ulsan and South Gyeongsang, 10 to 40 millimeters; the southern coast of South Jeolla, 5 to 30 millimeters; Jeju, Daegu and southern North Gyeongsang, 5 to 20 millimeters; the Honam region (excluding the southern coast of South Jeolla), 5 to 10 millimeters; central and northern North Gyeongsang, Ulleungdo and Dokdo, around 5 millimeters; and Daejeon, southern South Chungcheong and southern North Chungcheong, less than 5 millimeters.
After the rain ends, most of the country will be generally clear over the weekend.
Dry weather advisories have been issued for the Seoul metropolitan area, inland Gangwon, southern mountainous areas and parts of North Chungcheong. Along with the rest of inland Gyeonggi and the central and northern mountainous areas of Gangwon, these regions will experience dry atmospheric conditions. With moderately strong winds adding to the fire risk, caution is advised.
Sea levels will remain higher than usual for the time being due to strong lunar gravitational pull, and swells will flow into Jeju's coastal areas. High waves along Jeju's coast could sweep over rocky shorelines and breakwaters, requiring caution.
Through the 18th, winds of 30 to 60 kilometers per hour (8 to 16 meters per second) will blow strongly over the outer far seas of the southeastern South Sea and the inner far seas south of Jeju, with waves rising to 1.5 to 3.5 meters. The same conditions will persist through the 19th in the outer far seas south of Jeju.
