In terms of precipitation, rainfall in Chilliwack ranges from 2.3 - 12.3 inches per month. November is typically the wettest month, when rainfall can reach 12.3 in. August is typically the driest time to visit Chilliwack when rainfall is around 2.3 in.
If weather is an important factor for your trip to Chilliwack, 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 66.2 F. Travelers looking to avoid the cold should look outside of December, when temperatures are typically at their lowest (around 35.6 F).