Couple of things you could check:
- As mentioned, might be worth buying some new thermal paste and doing a fresh application and reseating the heatsink.
- Not sure where you live, but there are some places in the states with 90d temps right now and you could have a really high ambient temp. (Although probably not enough to make that large of a difference)
- Clean out your case regularly for dust. Wash your removable dust filters (if you have them) and use a can of compressed air to clean out your case. Can actually help more than you would think.
- Did you recently make any changes to your computer such as overclocking or anything? That could easily increase your comp temps, but I'm assuming you didn't.