Since Uganda is on the equator, it is pretty much difficult to say what is the winter. In fact, in Entebbe, the sun is highest at the vernal and autumnal exquinoxes, when the sun is at the zenith on the equator, the 21st of September and 21st of March. Both summer and winter solstices (21st of December and 21st of June) would then be considered as the two "winters" when the sun is lowest over the horizon. But it doesn't affect the temperature of the equatorial forest. When it comes to rain, usually just after the "summers" (equinoxes) are considered the rainy seasons.
As for the temperature, it depends on where you are, near Lake Victoria or in the mountains. But expect something in the range of 15 to 35 C.
As for the temperature, it depends on where you are, near Lake Victoria or in the mountains. But expect something in the range of 15 to 35 C.