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.
August 24 to September 4 – The Philippines participated in the 1970 Asian Games held in Bangkok, Thailand. It ranked 11th with 1 gold medal, 9 silver medals and 12 bronze medals with a total of 22 over-all medals.
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.