ESP32 Compatible environment Sensors

Most projects here start with one question: do you need humidity and pressure too, or just temperature? For temperature plus humidity over I2C, the SHT40 and its siblings (SHT41, SHT45) are the modern default - small, accurate and simple to wire. The BME280 adds barometric pressure on the same bus, which is why it shows up in so many weather stations, and the BME680 stacks a gas reading on top.

For anything wet or outdoors - soil, ponds, rain, freezers - the DS18B20 waterproof probe on its 1-Wire bus is the standard answer, and several probes can share one pin. The DHT22 and DHT11 still work fine for slow indoor readings on a budget, just with lower accuracy and update rates than the SHT and AHT parts that replaced them. Pressure-only needs are covered by the BMP280 and BMP388.