The library search found MCP9808-E/MS as a strong I2C temperature-sensor choice, and it identified IS31FL3731-QFLS2-TR as the best fit for a charlieplexed LED matrix style solution . The external search also confirms the IS31FL3731 is a 16x9 Charlieplexed PWM LED Driver, so it can comfortably handle an 8x8 display arrangement
Here’s a link to start a new editable project with those parts as the design intent: Create new project
If you want, I can also give you:
a cheaper option
an Arduino-focused option
a version with a bare 8x8 LED matrix instead of just the driver