Central Java Weather Forecast Today, 18 September 2026: Rain in 13 Areas and Tidal Flood Warning

The Meteorology, Climatology, and Geophysics Agency (BMKG) has released the weather forecast for Central Java, indicating that light rain is likely to hit 13 areas in the province today, 18 September 2026. Nevertheless, the public is advised to remain alert to the potential for forest and land fires (karhutla) as well as the threat of tidal flooding (rob) in the northern coastal regions.

Ferry Oktarisa, a forecaster at the BMKG Ahmad Yani Meteorological Station in Semarang, explained that weather in Central Java will generally be cloudy from morning to afternoon. However, from late afternoon into the early night, light rain is expected in mountainous areas, the central highlands, and parts of the northern coastal area (Pantura).

“Remain vigilant against forest and land fires, even though light rain is falling in many parts of Central Java. During this prolonged dry season, many plants are dry and easily combustible,” said Ferry Oktarisa on Friday (18/9).

For other areas, the weather is predicted to remain cloudy throughout the day. Winds will blow from the east to the south at speeds of 10-30 km/h. Temperatures will range between 16-36 degrees Celsius with humidity levels between 35-95 per cent. Ferry added that the air in the northern coastal region will feel more sweltering, as maximum temperatures reach 36 degrees Celsius.

In addition to land weather conditions, the BMKG Tanjung Emas Maritime Station in Semarang has also issued a warning regarding maritime conditions. Forecaster Lessy Andari reported an increase in tidal heights (rob) in northern waters, with a maximum of 0.9 metres from the early hours until the morning.

This condition is triggering tidal flooding in several northern coastal areas, ranging from Brebes to Rembang. “This tidal flooding can disrupt community activities such as transportation, cargo loading and unloading at ports, and inland aquaculture,” explained Lessy.

Furthermore, high waves between 1.25 to 2.5 metres are potential to occur in the region. BMKG warns that waves exceeding 1.25 metres pose a high risk to maritime activities, particularly for fishing boats and barges, especially when wind speeds exceed 15 knots. Residents engaged in activities in coastal areas are urged to increase their vigilance.