Samsung
Show or Hide Weather Forecast in Calendar auf Samsung
The Calendar app on Samsung phones can show a small icon next to each day with the forecast for the next seven days. This depends on a system connection between the Calendar app and the weather forecast widget, not on a separate calendar setting alone.
If the weather forecast widget is not placed on your Home screen or Side screen, the calendar has no weather source to read from. In that case the toggle inside Calendar settings may appear inactive or simply not affect anything, even when switched on.
Where to enable or disable it
Open Tap on Calendar ➔ Open the Menu ➔ Tap on Settings ➔ Enable or disable Show weather forecast. This toggle controls only the display inside the calendar grid, not whether weather data is fetched at all.
Turning it off removes the small daily icons from the month and week view immediately, without affecting the weather widget on your Home screen. Turning it back on restores the icons, provided the widget is still active and location access for weather is granted.
If icons still do not appear after enabling the option, check that the weather widget itself is still placed on a Home or Side screen and that it has permission to access your location.