If you're traveling on the Vasco del Interior path from Irún to Burgos in January, you should prepare for all kinds of weather as you move through the areas of Basque Country and Castile and León.
Starting in Irun and moving further into the Basque Country, the weather is usually calm with the temperature usually around 12°C during the day and 8°C during the night. You might see some clouds and rain due to the seaside environment. But, you also have a good chance of seeing the sun.
As you walk through Hernani, Tolosa, Beasain, and Zegama, the weather might change a lot. This might include sunny times and also moderate or heavy rainfall. Starting from Beasain, the temperature gets a bit cooler with the hottest temperature during the day around 11°C and the coolest at night around 6°C. In Zegama, temperatures can get as high as 9°C during the day and as low as 3°C during the night. Also, you might see more rain on this part of the trip.
When you reach Salvatierra and Vitoria, expect colder temperatures, as low as 0°C. The weather usually varies from sunny to partly cloudy, with possibly some snow and a bit of freezing rain. There may be regular to heavy rain, so be ready for this.
The last part of the trip, through Miranda de Ebro and Burgos, is usually colder during the winter. The temperature can range from a high of 7°C during the day to as low as 1°C or less during the night. It could rain the same amount as in other places, but also expect more snow and freezing rain. Some days are partly sunny and others are cloudy with rain.
In conclusion, the winter weather on the Vasco del Interior route in January can be hard to predict and cold. You may experience rain, snow or freezing rain at different parts of your trip. The weather usually gets colder as you move from the Basque Country on the east to Castile and León on the west.
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