The weather in Iceland is ever changing. Below is a link to the Icelandic weather forecast bureau where you can get the latest weather forecast.
During the few summer months here in Iceland the weather is relatively nice, at least by Icelandic standards. It can get fairly wet and rainy and in the beginning of summer it can become very cold in the nighttime. The winters here are very unpredictable and can range from mild rain to raging blizzards in a matter of hours so pleace show precaution and always look at the weather forecast before driving in Iceland.