Although weather is just one factor, it can really affect your travel plans, especially if you're planning an extended stay in Montalban. The hottest months are usually March and April, with an average temperature of 25°C, while the coldest months are January and February, with an average of 24°C. The rainiest months in Montalban are July, May, June and August, with each month seeing an average of 206 mm of rainfall.