If you’re hoping to get lost in the rain on your romantic getaway, take a look at these details about year-round temperatures in Batu: The hottest months are usually October and September, with an average temperature of 23°C, while the coldest months are August and July, with an average of 23°C. The rainiest months in Batu are January, February, March and December, with each month seeing an average of 634 mm of rainfall.