Yes! You can modify the application language, temperature units, wind units, pressure units, and distance units in 1Weather settings.
Tap Menu --> Settings and select “Language & units”
The Language setting allows you to choose from a variety of different languages.
To toggle between Fahrenheit (F) and Celsius (C), select the “Temperature Units” item.
You can select between miles per hour (mph), kilometers per hour (kph), meters per second (m/s), knots (kn), and Beaufort scale using the "Wind Units" setting.
Select “Pressure Units” to select between Inches of mercury (“), Millibars (mb), Millimeters of mercury (mm), Atmosphere(atm), and Kilopascal(kPa).
You can select between miles (mi) and kilometers (km) using the "Distance Units" setting.