If you walk the Camino Vasco del Interior in March, the weather can change a lot. At first, it's usually mild during the day, around 10 to 13 degrees Celsius, and cooler at night between 3 to 8 degrees. It often rains, and sometimes it rains heavily. The sky can be cloudy.
Next, you'll reach the border of Castile. The temperature is similar but slightly cooler, with highs of 10 - 12 degrees and lows of around 2 to 4 degrees. It can rain often, and the weather can turn bad. However, sometimes the sun comes out, so be ready for that. As you move into the plains of Castilla y León, temperatures are also similar. It doesn't rain as much, and you'll see the sun more often.
So, if you're walking this route in March, be prepared for changing weather. Expect a mix of warm and cool temperatures, sun and rain.
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