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MOST ACCURATE FORECAST: Heating up briefly before our next chance of rain arrives

We'll be near record highs in Phoenix on Wednesday, but big changes are on the way with storm chances and cooler temperatures.

Near-record heat on Wednesday, but big changes are on the way

By: Jorge Torres

Posted

and last updated

PHOENIX — Our forecast is drying out across Arizona as high pressure builds.

It's also turning up the heat in the Valley!

Temperatures will climb to 105 degrees or hotter by Wednesday and Thursday, just a few degrees shy of daily records.

This kind of late September heat brings a moderate to major risk of heat exhaustion and heat stroke. If you are spending time outside, pace yourself, stay hydrated, and find shade whenever possible.

By Thursday, breezes will start to pick up as the next storm system approaches. That storm will drop Valley temperatures more than 10 degrees by Friday and bring widespread storm chances across Arizona.

Flash flooding will be possible, too!

A Flood Watch is in effect from Thursday morning through Saturday evening for parts of southeastern Arizona, including Tucson.

Thunderstorms could bring one to two inches of rain, with higher totals in the mountains.

Flooding may occur in rivers, washes, and other low-lying areas, as well as in city streets and low-water crossings, making travel dangerous.

Here in the Valley, storm chances increase Thursday night, peak Friday, and linger through the weekend.

With just one week left in monsoon season, these could be our final rain chances of the year. So far, Phoenix is running more than an inch below normal.

The good news is this storm will bring a welcome cooldown!

Valley highs drop into the upper 80s and low 90s this weekend, with overnight lows in the low to mid 70s.