Many surface urban heat island (SUHI) studies have been conducted around the globe, however there is still a lack of information available regarding the intensity of SUHI (SUHII) in Bangladesh cities. This study focused on diurnal and seasonal SUHI variability, temporal trends and possible drivers in five major cities. Mean annual daytime SUHII ranged from 2.88 °C for Dhaka to 0.84 °C for Rajshahi, while nighttime intensity varied from 1.91 °C (Chittagong) to 0.30 °C (Sylhet). The pre-monsoon period exhibited the greatest magnitude and the seasonal amplitude during the winter season was positive for Dhaka and Khulna but negative for the other cities. Correlation analysis indicated that a dense city population, a high degree of imperviousness and the absence of greenery were likely to act singly, or in combination, to increase urban warming within these cities. An increasing warming trend during daytime was observed. The urban population of Bangladesh is projected to increase substantially in future (i.e., to 81.4 million by 2029), so the findings of this study provide valuable insights into this warming issue and will assist in the development of effective local-scale climate change adaptation plans.

全球已经进行了许多地表城市热岛 (SUHI) 研究，但是仍然缺乏关于孟加拉国城市 SUHI (SUHII) 强度的可用信息。本研究侧重于五个主要城市的昼夜和季节性 SUHI 变异性、时间趋势和可能的驱动因素。年平均白天 SUHII 的范围从达卡的 2.88 °C 到拉杰沙希的 0.84 °C，而夜间强度从 1.91 °C（吉大港）到 0.30 °C（锡尔赫特）不等。季风前期表现出最大的幅度，冬季的季节性幅度对达卡和库尔纳来说是正的，但对其他城市来说是负的。相关性分析表明，城市人口密集、不透水程度高和缺乏绿化很可能单独或共同作用，以增加这些城市内的城市变暖。观察到白天变暖趋势增加。孟加拉国的城市人口预计未来将大幅增加（即到 2029 年达到 8140 万），因此本研究的结果为这一变暖问题提供了宝贵的见解，并将有助于制定有效的地方尺度气候变化适应计划.