July in Tullamore is the rainiest, the cloudiest, and the warmest month of the year. In July, the weather in Tullamore is typically warm. Average daily high temperature in July is about 17 degrees above zero. On average, Tullamore has 29 rainy and 2 sunny days in July. The rains are usually heavy. July as well as January, February, March, and April is considered the most uncomfortable time to visit Tullamore.