My BME280 is around 1F hotter outside than a DS18B20 outside in another project. Not a big deal but I am also researching how to keep it cool. The library I am using is this one.

@irenla
You have probably already figured this out but try this.

return temp;
float tempF = (temp * 9.0) / 5.0 + 32.0;

you get the idea now.