Global climate change has resulted in the Philippines experiencing a sea surface temperature (SST) increase of 0.2 °C per decade since 1970. While satellite measurements of sea surface temperatures (SSTs) are hugely valuable, they cannot capture the high temporal or spatial resolution of dynamic coral reef environments. Additionally, open ocean pH has declined by 0.1 pH units since the Industrial Revolution, but ocean acidification is known to be magnified in coral reefs, in addition to greater pH variability. Marine Conservation Philippines is initiating the Philippine Integrated Reef Observation Network (PIRON) by distributing a number of temperature and salinity loggers at depths ranging from 5m to 50m across southern Negros Oriental, enabling us to determine natural seasonal variation and, eventually, long-term trends. Water samples will also be collected from each PIRON station to be analysed for dissolved inorganic carbon, total alkalinity and pH. In the future, we hope to expand our sensor capabilities to include dissolved oxygen, PAR and nutrients.