In terms of precipitation, rainfall in Greymouth ranges from 7.5 - 10.6 inches per month. October is typically the wettest month, when rainfall can reach 10.6 in. February is typically the driest time to visit Greymouth when rainfall is around 7.5 in.
If weather is an important factor for your trip to Greymouth, use this chart to help with planning. For those seeking warmer temperatures, January is the ideal time of year to visit, when temperatures reach an average of 60.8 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 44.6 F).