Your trip starts in Madrid, where early July is usually sunny, with highs around 31°C and lows around 19°C. It's mostly dry, with little rain.
You then go north to Tres Cantos and Manzanares el Real, where it'll be a bit colder, with highs near 30°C and lows near 18°C. You might have a bit of rain here, more than in Madrid.
Next, you'll reach Cercedilla in the mountains. Here, temperatures drop a bit more, with highs around 24°C and lows around 12°C.
Then you go to Segovia and Sahagún in the Castile and Leon region. Here, it's mostly sunny with highs around 30°C and lows around 15°C. But, there may be a bit of rain.
The second half of the trip, in areas like Leon and Foncebadón, is a little cooler, with highs in the mid-to-high 20s. In Ponferrada and Villafranca del Bierzo, it might be cloudier with more rain.
As you reach Galicia, the weather changes more. In O Cebreiro and Triacastela, it can be sunny or cloudy, and it might rain heavily. The highs are in the mid-20s and the lows can go down to about 13°C.
In spots like Sarria, Palas de Rei, and Arzúa, it's often cloudy with a bit of sun. The highs are in the mid-20s while lows are around the lower 10s.
The last part of your trip is in Santiago de Compostela. Here, you can expect cloudy weather with a bit of rain. The high temperatures stay in the mid-20s, with lows dropping slightly to 13°C.
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