Phoenix Temperatures Will Decrease This Weekend

A low pressure system will push temperatures down from current triple-digit highs starting this weekend.

Updated on Oct. 8, 2026 in Forecasts

Phoenix Temperatures Will Decrease This Weekend

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Phoenix residents will see a shift in the weather as temperatures fall following a record-setting stretch of heat. The city has already recorded 129 days of triple-digit temperatures this year.

Why it matters

The upcoming change in weather is driven by a low pressure system moving from the Pacific Northwest and tropical storm Rachel providing moisture. This shift marks a significant break from the prolonged extreme heat that has defined much of the season.

Phoenix has recorded 129 days at or above the 100-degree threshold so far in 2026. This total represents the fifth-highest tally of triple-digit days on record for the city since tracking began.

The details

Temperatures are expected to reach 103 degrees on Thursday and 102 degrees on Friday before dropping significantly. By next Tuesday or Wednesday, highs are projected to retreat into the upper 70s as the regional weather pattern transitions.

March 18, 2026: First 100-degree day of the year.
October 9, 2026: Forecast high of 103 degrees.
October 13-14, 2026: Forecast highs in the upper 70s.

Seasonal Patterns

This cooling trend follows the pattern established by the historical average latest triple-digit day of October 5. While 100-degree temperatures have been recorded as late as October 27 in past years, the current shift aligns with typical seasonal transitions.

Residents should prepare for continued high heat through Friday before the expected drop in temperatures occurs. Ensure that cooling systems are functioning correctly and limit outdoor activities during the final days of the triple-digit heat.

The takeaway

The upcoming weather shift provides relief after one of the most intense heat seasons in the city's history. Residents can plan for outdoor activities to become more manageable as temperatures move toward the 70s next week.