In April, walking the Camino de Finisterre in Galicia has mild but changeable weather. Average high temperatures are 13°C to 15°C, and lows are 4°C to 5°C.
Often, it is cloudy, with only a few sunny times. Rain is usual in this area in April, with light showers common and sometimes heavy rain. There is usually around 3-4 mm of rain each day, with a bit more close to Olveiroa.
As you get closer to the coast, the weather can become more uncertain with the chance of heavier rain, especially in Corcubión and Fisterra. But, there are still sunny times, especially when you reach Fisterra, where it is often partly cloudy and sunny.
Overall, April weather in Galicia keeps changing. Expect lots of clouds and some rain because that's normal for this time. So, pack your gear accordingly.
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