February has to be one of the top months for travel in Sri Lanka. Sri Lanka is a year round destination; however February does give you excellent chances of fantastic weather and great wildlife sightings at the one time.
Starting with wildlife, February is similar to January in that the wildlife parks in the east are dry. Wilpattu is excellent for wildlife and birding at this time of year, as is Udawalawe. Yala National Park is wonderful for leopards at this time of year as they like to bask in the bright sun.
The southwest is hot, sticking to around 30 °C in the daytime. This is perfect for some beach time, especially around Weligama, Tangalle, Mirissa, Bentota and Negombo where you may be able to spot whales, or you can relax on sand-strewn beaches.