In terms of precipitation, rainfall in Lerwick ranges from 50.0 - 120.0 inches per month. January is typically the wettest month, when rainfall can reach 120.0 mm. May is typically the driest time to visit Lerwick when rainfall is around 50.0 mm.
If weather is an important factor for your trip to Lerwick, use this chart to help with planning. For those seeking warmer temperatures, July is the ideal time of year to visit, when temperatures reach an average of 12.0 C. Travellers hoping to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 4.0 C).