Cape farmers were having trouble with frost and now there are problems with drought.
There are two things needed for convectional rain and those are 1) Moisture in the air 2) Upward convection of air. As to moisture you can place black sheeting in the sea off Cape Town to heat the sea and supply moisture - see
https://airartist.blogspot.co.za/2018/03/could-we-create-small-el-nino-close-to.html
As to convection, you could have tall poles with rigid black plastic "roofs" on to shade crops and heat up the air above the black plastic (which will get hot in the sun). The black plastic will work in an opposite way to "cool roofs" which reduce rainfall - see https://www.scientificamerican.com/article/cool-roofs-may-have-side-effects-on-regional-rainfall/
As to frost (winter is coming), have sheets of plastic, on the poles mentioned, that deflect wind downwards and keep mixing warm air into the cold air near the ground.
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