Here are two other ways to check if your body is dehydrated. Try this skin test. First, use two fingers to grab a roll of skin on the back of your hand (between where your watch sits and where your fingers start), advises Higgins. Pull the skin up about Â½ to one centimeter high and then let the skin go.
October is our wettest month, and Iceland gets an average low of 37Â°F (about 3Â°C) and highs of 45Â°F (7Â°C). Expect lots of rain, usually drizzle. The average amount of rain is 4 to 5 inches, or 101-127 mm. But as always, the rain amount depends on which part of Iceland you are visiting.
I always say that 15 August is the start of autumn in south-west Iceland, and certainly a few leaves do begin dropping around that date. But, in recent years we have also had warm weather in late August and into September. Night-time temperatures will depend very much on where you are, and how the weather behaves.