After a low in the beginning of Chaitra, the last month of spring in the Bangla calendar, the temperature has started to rise by the end of the month. The Met Office says a heatwave is sweeping over Tangail, Faridpur, Rajshahi, Pabna,, Jessore, Kushtia and Khulna. On Monday, Bangladesh's highest temperature of 38.3 degrees Celsius was recorded in Chuadanga. The maximum temperature in Dhaka was 35.5 degrees Celsius. Meteorologist Ruhul Kuddus told bdnews24.com that the first heatwave of the season may continue sweeping over a vast swathe for some more days. In the outlook for April, the Meteorological Department said an acute heatwave with more than 40 degrees Celsius of temperature may hit the north and northwest. The other parts of the country may experience one or two mild or moderate heatwaves with temperature between 36 and 40 degrees Celsius. One or two low may develop in the Bay of Begal and one of those may turn into a cyclone, the Met Office said. Meteorologists said thunder showers and norwesters occur in this season. In Tuesday's forecast, the Met Office said rain or thunder showers accompanied by temporary gusty or squally wind is likely to occur at one or two places over Sylhet division. Weather may remain mainly dry with temporary partly cloudy sky elsewhere over the country. Day and night temperature may remain nearly unchanged over the country.