When flying from Johannesburg to Cedar Rapids, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.
Expected rainfall in Johannesburg is less than in Cedar Rapids. You can expect this to be the case over the next 15 days.
With an average temperature of 29 °C, peak weather can be found in July. As a traveller, expect to see changes in flight prices during that period. The temperatures in Cedar Rapids are hotter than in Johannesburg.