Abilities that take effect under sun: Drought, Chlorophyll, Dry Skin, Flower Gift, Forecast, Leaf Guard, Solar Power, Harvest (boosted effect), Desolate Land
Abilities that take effect under rain: Drizzle, Dry Skin, Forecast, Hydration, Rain Dish, Swift Swim, Primordial Sea
Abilities that take effect under hail: Snow Warning, Forecast, Ice Body, Snow Cloak, and Slush Rush
Abilities that take effect under sand: Sand Spit, Sand Stream, Sand Force, Sand Rush, Sand Veil
Hope this helped!