Hi
You could use the Luftdaten arduino software with the esp8266 and Brian has very kindly adapted WD to read the temp and humidity data via the ip address of the esp8266. (The Luftdaten software is really designed to monitor air quality but it has tick boxes to say which sensors are in use so you could ignore the AQ sensor). For the T/H sensor I would recommend the BME280 which, so far, has been more reliable than the DHT22 which Luftdaten put on their shopping list. On my (rather basic) website you can see the sensor T/H as BME280. www.greatbosullow.net I’m not sure how you could get multiple sensors showing.
Alan