PMI doesn’t have a separate “units” toggle; the temperature follows your personal language/locale.

1. Profile menu: Click your name (top-right) ▸ Settings / Personal preferences.
2. Change language
   • English (UK) → Celsius (°C)
   • English (US) → Fahrenheit (°F)
3. Save & refresh: Log out / in (or refresh the browser). The weather icon now shows the new unit.