Crisp Widget for Weather
Support

Touch and hold an empty spot on your home screen, choose "Widgets", pick Crisp Widget for Weather, and drag it to where you want it. You can also open the app and use "Add to Home Screen" on the settings screen (this does not work with some home screen apps).
Once it is placed, touch and hold the widget to resize it.

Opening the app takes you to the settings screen. Change the font, color and opacity, size and more while watching the preview at the top, then tap "Apply & Save" to update the widget. If you have more than one widget, choose the one you want to change in the selector at the top.

Some manufacturers (Xiaomi, OPPO, ASUS and others) stop apps with their own battery-saving features.

• Go to Settings → Apps → Crisp Widget for Weather → Battery and set it to "Don't optimize" or "Unrestricted"
• If your phone has a manufacturer-specific "Autostart" setting, turn it on

If the app is stopped with "Force stop" or a cleaner app, its scheduled updates are cleared. Opening the app once restores them.

Forecasts from Open-Meteo (https://open-meteo.com/) are fetched directly from your device (CC BY 4.0). They do not go through the developer's servers. Data is fetched about every 30 minutes, and the display moves forward one hour on the hour.

Only when you choose "Use current location" on the settings screen, it is used as the place to get the forecast for. The latitude and longitude are sent to Open-Meteo. If you set the place by searching for a city, no location permission is needed.

Choose 3, 5, 8 or 12 hours ahead under FORECAST on the settings screen. Tapping the widget also cycles through them.

From "Detailed forecast" on the settings screen, you can open a 7-day forecast (meteoblue) for that place in your browser.