I keep getting a very bad headache every evening. Could it be serios?

For about a month now ive been gettin the same headache nearly every evening. It hurts horribly across my forhead like a normal headache but i also have bad pain on my temples and they feel very tender :-( and on top of my head it feels very heavy. I wake up in the morning usually fine but by the time evening comes it starts hurting again. Someone said it could just be the weather but im not sure... Could it be anything serious? Going doctors monday.