Regardless of the time of day you decide to fly, the ticket price will remain around the same. Book flights from Salt Lake City to Dakar as you normally would.
In terms of precipitation, rainfall in Dakar ranges from 0.4 - 5.9 inches per month. August is typically the wettest month, when rainfall can reach 5.9 in. January is typically the driest time to visit Dakar when rainfall is around 0.4 in.
If weather is an important factor for your trip to Dakar, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 80.6 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 69.8 F).