Malaysia´s Sibu: The Hottest Night on Record, +26,4°C

Only on Friday, June 13th 2025 we have informed about historic heat in Brunei and Malaysia /https://mkweather.com/36-1c-in-brunei-ap-only-01c-from-all-time-june-record-malaysia-359c//. Heatwave is continuing, with measured extremely hot nights in the region and severe heat index.

Malaysia’s town of Sibu in Sarawak state recently experienced an extraordinary meteorological event: a minimum overnight temperature of 26.4°C, marking the hottest night ever recorded in the area. This latest record-breaking heat wave underscores the ongoing trend of extreme heat across parts of Borneo and neighboring Brunei.

🔥 Record Heat Across Sarawak, Sabah, and Brunei

For several consecutive days, Sarawak and Sabah states in Malaysian Borneo, along with the nearby nation of Brunei, have faced persistent high temperatures combined with oppressive humidity. These conditions have pushed heat indexes to alarming levels — hovering between 45°C and 48°C.

🌡️ Why Is This So Significant?

A minimum temperature of 26.4°C overnight is exceptionally unusual because nights typically provide relief from daytime heat. Such warm nights can disrupt human health, increasing risks of heat stress, sleep disturbances, and exacerbating respiratory and cardiovascular issues.

The extreme humidity in the region intensifies these effects. When combined with elevated temperatures, humidity increases the heat index, or “feels-like” temperature, which is a critical factor in how people experience heat stress.

⚠️ Health Advisory

Stay hydrated and avoid strenuous activity during peak heat hours.
Use fans or air conditioning where possible to cool indoor environments.
Be vigilant for symptoms of heat exhaustion, such as dizziness, nausea, and headaches.
Check on vulnerable individuals regularly.

📰 Conclusion

Malaysia’s record-breaking hot night in Sibu is a stark reminder of the growing challenges posed by extreme heat in tropical regions. As climate change continues to influence weather patterns, monitoring, preparedness, and adaptation will be crucial to protect communities in Borneo and beyond.