Planning for the weather is an important factor for making your trip to Lamongan a success, especially when you're splurging. The hottest months are usually October and September, with an average temperature of 29°C, while the coldest months are July and August, with an average of 27°C. The rainiest months in Lamongan are December, February, January and March, with each month seeing an average of 290 mm of rainfall.