There might be some reasons why the forecast data is not showing on your weather view. 

(1) It is mandatory to create weather shortcodes with Geo Coordinates for a specific location to show the weather forecast data. Read the docs to learn how to set Coordinates: https://locationweather.io/docs/docs/how-to-display-weather-details-with-geo-coordinates/

(2) If you are using a free API of OpenWeather, this can be another reason. You can check your services/plan from the OpenWeather Services. Check the screenshot: https://prnt.sc/WqWwsyeuHLc6. Here, you will see what a Free Plan offers.

Now, to show weather forecast data with a free API, follow the instructions:

You can subscribe to the One Call API 3.0 plan with valid credit card information, which will allow you to show hourly forecast for 48 hours and daily forecast for 8 days with the plugin. You can use this without any cost, as it offers 1,000 calls per day to show the weather forecast. 

After that, for each call, you will be charged by OpenWeather. To avoid the charges, you can limit the calls from your OpenWeather account. Check the screenshot: https://prnt.sc/DmGHj4-7Tp60

Additional Information:

OpenWeather recently updated their policies ( September 2022 ), and now free plan services are limited, so a user will need to subscribe to a plan to show forecast day weather information. You can also check this doc: https://locationweather.io/docs/docs/how-to-configure-display-upcoming-weather-forecast-data/