January to March – The First Quarter Storm was a period of leftist unrest in the Philippines, composed of a series of heavy demonstrations, protests, and marches against the government.
January 26—President Marcos delivers his State of the Nation Address at the Legislative Building, Manila. Student groups, National Union of Students of the Philippines, and Kabataang Makabayan conducted a rally outside the building, in which, were confronted by the riot police as they marched to Malacañang, leaving many injuries.
October 13 – Super Typhoon Sening landfalls on Lagonoy Gulf with sustained winds of 280 km/h. Sening left over 80,000 people homeless, in addition to killing 575 people (193 people were unaccounted for, and have since been declared dead, bringing the total toll to 768) and injuring nearly 1600. US$74 million (1970 US$, $373 million 2005 USD) of damage was estimated.
November 10 – The Constitutional Convention was called to change the existing Philippine Constitution which was made during the Commonwealth of the Philippines. Special elections for the CON-CON Delegates who will represent the various provinces of the country were held.
November 20 – Violent typhoon (Typhoon Patsy or Yoling) with winds of (more than) 125 mph raged through the heavily populated (Luzon) island, wrecking the harbor and airport facilities at Manila.Typhoon Patsy was one of the deadliest typhoons to strike the Philippines in its history. 611 people were killed (with 351 missing) on the island, and 135 people were killed at sea due to shipping failures. In Manila, 120 persons died, 60 others were missing, and more than 1,000 injured; property damage reached $80 million.