If you walk from Ponferrada to Santiago de Compostela on the Camino de Invierno path in April, you'll see all sorts of weather.
You'll be walking through Castilla y León and Galicia. There, you'll see lots of sunny and cloudy days, with some rain. It's common to have medium to heavy rain showers. Some days might be very cloudy. Galicia is famous for occasional rain, so you might see that.
When it comes to how hot or cold it will be, you'll see anything from 13°C to 18°C during the day as you go further along the path. At night, it might start as cold as 2°C, but by the end of the journey you'll likely see between 6°C to 8°C.
Keep in mind, the closer you get to Santiago de Compostela, the more rain you're likely to see. On average, you might see little rain (about 2mm), or a lot of rain (about 9.2mm).
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