In terms of precipitation, rainfall in Stornoway ranges from 2.0 - 4.7 inches per month. January is typically the wettest month, when rainfall can reach 4.7 in. May is typically the driest time to visit Stornoway when rainfall is around 2.0 in.
If weather is an important factor for your trip to Stornoway, use this chart to help with planning. For those seeking warmer temperatures, August is the ideal time of year to visit, when temperatures reach an average of 57.2 F. Travelers looking to avoid the cold should look outside of January, when temperatures are typically at their lowest (around 41.0 F).