July weather forecast in Keflavík

July in Keflavík is the warmest month of the year. In July, the weather in Keflavík is typically warm. Average daily high temperature in July is about 12 degrees above zero. On average, Keflavík has 15 rainy, 6 sunny, 6 partly cloudy, and 4 cloudy days in July. The rains are usually moderate.