Tuesday, June 16, 2026

Question: Arizona’s monsoon season officially runs from June 15 to what date?

Answer: Sept. 30. Longtime residents who know that storms may not begin until closer to July may find this start date odd. The June 15 date was not established as a predictor for precipitation but rather a historically observed average date of when prevailing winds shift from a dry westerly flow to a moist southerly flow.