Thank you for your query,
The temperature you mentioned in your query is normal and the temperature is not suggestive of fever
And there will be minimal variations in the recordings of morning and evening temperatures(up to 0.5 degree F), and this variation is physiological.
Coming to knee pain
two knee joints pain is there? Any swelling of joints is there? History of trauma? This information is important to give you proper advise regarding the seriousness of the condition.
Hope i have answered your query, if you have any clarification feel free to ask me,