PHOENIX – This unprecedented, record-breaking heat wave ends today!

Phoenix Sky Harbor recorded 21 straight days of record-breaking heat Monday, but relief is now in sight.

Low pressure is moving through our state, bringing cooler air and the risk of showers and thunderstorms to parts of northern Arizona.

Here in the valley we will finally put an end to these sizzling triple digit temperatures as the cooler air moves in.

Temperatures will fall into the mid-90s starting today before an even bigger drop this weekend.

Our first major fall storm system will move in from the northwest late Thursday and Friday. Once it arrives, we will see widespread rain chances across Arizona and perhaps even some snow Friday night into Saturday morning for areas above 6,500 feet elevation.

Scattered showers may occur in the Phoenix area as early as Friday morning, with isolated showers possible into Saturday.

There will be a stronger breeze ahead of the storm on Wednesday, Thursday and Friday, and temperatures will drop dramatically through Saturday as the cold air settles behind it.

Phoenix could fall into the 70s on Saturday and reach early morning lows in the 50s across the valley on Sunday morning.

This is the relief we've been waiting for since May! Now it looks like we may finally be done with triple-digit heat for the year.

Phoenix has had 142 days this year with high temperatures of 100 degrees or more. This is the third highest number since records began.

On average, our last triple-digit day is October 5th, but we haven't seen highs in the 100s until October 27th in 2016.

This record-breaking year also brought the newest 110-degree day ever to Phoenix on October 7th of this year. The previous record was September 19, 2010.

Phoenix has had 70 days this year with high temperatures of 110 degrees or more, also an all-time record. The previous record was only set last year at 55 days.

As La Niña forms in the Pacific Ocean, it is likely that we will continue to experience warmer and drier than normal conditions overall throughout the fall and winter months.

Our drought has recently been made worse by the hot and dry monsoon season we just had.

Phoenix recorded just 0.74 inches of rain this monsoon, making it the seventh driest monsoon on record. Our 30-year average (which is considered our normal rainfall amount) is 2.43 inches. However, it is important to remember that this represents a decrease from the previous 30-year average of 2.71 inches (from 1981 to 2010) as the climate in our valley continues to become hotter and drier.

With an overall average temperature of 98.3 degrees, the 2024 monsoon was also the hottest monsoon ever recorded in Phoenix. That beats the previous record of 96.9 degrees that we set last year. All 25 hottest monsoon seasons have occurred in the last 25 years.

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Sky Harbor Official Rainfall So Far in 2024: 4.54 inches (-1.09 inches from average)

Monsoon 2024 Sky Harbor Official Rainfall: 0.74″ (-1.69″ from average)

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Daily rainfall reports from across the valley are available Here.

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PHOENIX IS GOING DRYER – LOWER PRECIPITATION AVERAGES NOW

Average monsoon rainfall in Phoenix (1981–2010): 2.71 inches of rain

NEW Phoenix average monsoon precipitation (1991-2020): 2.43 inches of rain

Average annual precipitation in Phoenix (1981–2010): 8:03 inches of rain

NEW Phoenix Average Annual Rainfall (1991-2020): 7.22 inches of rain

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View the full 7-day forecast

Arizona Interactive Radar