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.
Posts made by Scott Wilson
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    RE: BME280 Temp/Hum sensor on battery power increasingly skips(?) operationposted in Troubleshooting
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    RE: Celsius to Fahrenheit Conversion with HTU21DFposted in Hardware@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.