Evening rise in temperature or night sweats: In some diseases, the rise in body temperature s evident only in the evening hours or the patient may be woken up at night with sweating. This pattern is seen when the elevation in the temperature is mild to moderate and added to the diurnal rise in the evening, the body temperature goes beyond the normal level. Common causes for evening rise of temperature are tuberculosis, leukemias, autoimmune disorders etc.

ref:Rational Medicine