First, check that you are using the expected scale - Fahrenheit or Celsius.
Tap More --> Settings (gear icon, upper left)--> Temperature to verify.
If you have confirmed that you are using the correct scale and still see this discrepancy, scroll down on the settings page to the "Report location/temp issue" item.
Tap to create an email you can send with the info we're getting for your locations from our provider so our product manager and data provider can investigate.
We are currently working with WDT Inc. (Weather Decision Technologies Inc.) for our weather data.
If you are interested in learning more about WDT technologies, you can do so at http://wdtinc.com/company-overview/