The Willits climate can best be described as Mediterranean and is marked by cool, wet winters and hot, dry summers. Though slightly inland, the Little Lake Valley is strongly influenced by coastal weather and mornings are often cloaked in fog. By mid-morning the fog rolls away, leaving a wide-open sky primed for afternoon clouds and showy sunsets.

Average January temperatures range from 32 to 54.9 degrees F. Average July temperatures range from 47.3 to 85.3 degrees F. Willits experiences an average of 34.5 days with highs above 90 degrees F.

Annual precipitation averages 51.4 inches a year, with most rainfall occurring between October and April. Occasional snow falls in Willits with an average of 3.7 inches falling annually, just enough to give area school kids reason to whoop.