Very high winds will be sweeping across South Iceland this afternoon, which will make driving difficult and possibly dangerous for smaller cars. Fortunately, these conditions will taper off as the night wears on.
The weather warning applies to all of South Iceland from late afternoon until about 23:00 tonight. Winds from 15m/s to 25m/s can be expected for the region, with gusts reaching speeds from 40 to 45m/s. The accompanying rains that are expected, in the southeast especially, will make driving conditions even more difficult.
This being the case, it is inadvisable to drive through these regions if you are in a compact car. Gusts of winds are actually stronger near mountains than in plains areas, so extra caution should be taken when driving past Mýrdalsjökull and Vatnajökull especially.
Luckily, winds should calm down by midnight, and rains will move further north. By tomorrow morning, conditions will be calm and relatively warm for most of the country, apart from some rain in the northeast.