If you are planning to walk the Camino del Sureste, you can look forward to hot and sunny weather most of the time. August is especially hot, with day temperatures often reaching the thirties and night temperatures not falling below the twenties. You will find this same weather at all the places that you go through, whether it's the seaside, flat fields, or vineyards.
You start in Alicante, a city by the sea, and then go through smaller places like Orito, Petrer, and Villena. You can expect sunshine on most days, with some periods of clouds. Rain is quite rare in August at these places, but it might rain lightly on some days.
When you enter the wine-growing area around Yecla and Montealegre del Castillo, you will find a lot of sunny days here as well, although it might rain sometimes.
The weather might be more cloudy and rainy when you keep walking into Pétrola and Albacete, a city in the southeast of Spain. Even then, rain is not likely to be a significant issue during your journey. The temperature does not change much throughout the journey, remaining hot throughout.
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