Tucson Sees Rainiest Halloween on Record
Southern Arizona faces a Flood Watch and more storms as abnormally high moisture moves into the region.
Updated on Nov. 1, 2026 in Forecasts
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Tucson recorded its rainiest Halloween on record on October 31, surpassing the previous mark set in 1926. A Flood Watch is in effect for Southern Arizona from 11pm Saturday until 5am Monday.
Why it matters
The record rainfall and Flood Watch reflect abnormally high moisture pushing into Southern Arizona, bringing high rain chances and possible flooding for Tucson residents. Storms may become severe in isolated cases due to high wind gusts.
Tucson's record Halloween rainfall was measured against a benchmark set in 1926, about 100 years ago. Precipitation chances are forecast at 70% tonight, 90% Sunday, and 40% Monday, with the exact accumulation totals still unreported.
The details
Abnormally high moisture pushed into Southern Arizona, bringing high rain chances and isolated storms that could become severe due to strong wind gusts. Sunday has been designated a First Alert Weather Day, and heavy rainfall is possible, which could lead to flooding.
Timeline
October 31, 2026: Tucson records its rainiest Halloween on record.
Tonight at 11pm to Monday at 5am: Flood Watch in effect for Southern Arizona.
Sunday, November 1, 2026: Another First Alert Weather Day with high rain chances.
Tuesday, November 3, 2026: Rain is forecast to dry out and sunny weather returns.
Seasonal Patterns
This record surpasses the 1926 Halloween rainfall benchmark in Tucson, placing the October 31 event in a century-long comparison of local seasonal rainfall. Temperatures are forecast to rebound into the mid-to-upper 70s but remain below normal, continuing a cooler-than-average pattern after the storm.
Residents should monitor the Flood Watch that runs from 11pm Saturday until 5am Monday and avoid flooded roads. Heavy rainfall is possible Sunday, so plan travel and outdoor activities with the forecast in mind.
The takeaway
Plan for wet conditions through Monday, as the record rainfall signals an unusually active moisture pattern for Southern Arizona this weekend.
What happens next
Rain is forecast to dry out starting Tuesday, November 3, 2026, with temperatures warming back into the mid-to-upper 70s.
Further reading
Track the coming days in the Forecasts section for Tucson's rain and flood outlook.
Source note: This article includes information reported by Kold.
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