Manila is a tropical country -- so there are only two seasons: wet and dry. The weather and temperature rarely changes which means you can visit Manila any time of the year. If you're touring, it's best to avoid the rainy season in July and August.
Eighty degrees is an average temperature throughout the year, although how this feels can vary with the humidity. Nights rarely get cold, even during the winter months. Updated weather information for Manila can be found online at http://www.wunderground.com/global/st... or http://weather.cnn.com/weather/foreca... .
Travelers interested in heading to Manila during important events throughout the year should know that Manila celebrates major international holidays such as Christmas, New Years and Easter as well as local holidays. Information on local events throughout the year is available online at http://www.tripadvisor.com/Travel-g29... .