En (rains) mil. implies In rains thousand. The best form is "llueve mucho" which means it rains a lot.
En agosto y en no tomes el sol sin sombrero (don't sun.) Means In August and in do not sunbathe without a hat (don't sun)
Conclusively, The above phrase is incorrect and the right way is to say, "In August there is no too much sunlight and so one do not need to sunbathe or use a hat" which is En agosto no hay demasiada luz solar y por lo tanto uno no necesita tomar el sol o usar un sombrero".
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