In terms of precipitation, rainfall in Onslow ranges from 0.0 - 2.0 inches per month. February is typically the wettest month, when rainfall can reach 2.0 in. August is typically the driest time to visit Onslow when rainfall is around 0.0 in.
If weather is an important factor for your trip to Onslow, 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 86.0 F. Travelers looking to avoid the cold should look outside of July, when temperatures are typically at their lowest (around 64.4 F).