The only reason we have weather on earth is because earth has variable temperature. It may be 60 degrees in New York City and 80 degrees in Houston, and this causes pressure differential. Earth's surface is heated unevenly, and this heat attempts to redistribute itself across the globe. This redistribution causes air pressure to change, water to evaporate, etc. causing what we call, weather.
If this world received sunlight from all sides, the weather would be comparatively simple.
1.Humidity - If this world had enough water to support life, coupled with constant light from all sides, it would be very humid
2.Wind - This world would not have much wind. Since wind is the result of air moving from high pressure areas to low pressure areas, wind won't be common
3.Inclement weather - You could pretty much say goodbye to tornadoes, thunderstorms, and hail, as these are all caused when cold air and warm air collide. However, all of the air on your world will be the same temperature, so none of that
4.Climate - Specifically, the ocean. If this planet has oceans, they will have a ton of energy stored up, because they are constantly warmed on all sides. This will act like a giant heater to the land near the sea
5.Biodiversity - As the climate will be homogenous, animals will be fairly uniform throughout your world
These are only a few of the ways that a world like this would be different, hope it helps!