In April, the weather in Kalgoorlie-Boulder is typically warm. Average daily high temperature in April is about 23 degrees above zero. On average, Kalgoorlie-Boulder has 16 sunny, 12 partly cloudy, 1 rainy, and 1 cloudy day in April. The rains are usually light. April as well as March, October, and November is considered the most comfortable time to visit Kalgoorlie-Boulder.