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Evening Weather Forecast - 9/17/25
We might see some rain this week! FOX 10's Erica Horvatin has more.
PHOENIX - Changes to our weather begin today around the state.
Increased humidity, cloud coverage and eventually, rain chances start today and last into the end of the week. At the same time, temperatures will drop, making for more comfortable conditions.
Today:
What was once Tropical Storm Mario is now remnant moisture that is slowly being dragged over parts of California and southwestern Arizona. As this continues, chances for showers and a few storms will increase between Wednesday and Friday.
In the Valley, clouds will continue to build up from the South throughout the day on Wednesday. A partly to mostly cloudy day is expected in Phoenix with a 10% chance of showers during the afternoon and early evening. Chances may increase to 20-30% by overnight and into Thursday morning.
Later This Week:
The chance for storms and showers increases to 30-40% between Thursday and Friday. Pockets of steady rain will be possible around the state, even in the Valley.
Wet weather in Arizona will be hit or miss, but some pockets of 0.25" to 0.50" – even up to 1" – will be possible. Currently, the best area for rain appears to be over southwestern Arizona with some High Country storms, too.
Temperatures are impacted by the extra clouds and showers. Highs fall from 102 in Phoenix on Wednesday to 98 on Thursday and Friday and back to the low 100s this weekend.
Friday will likely be the wettest day in Arizona, including in the Valley.
This Weekend:
Lingering rain chances around 10% are forecast Saturday in Phoenix, but generally conditions will dry over the weekend.
You can always check the latest weather conditions by visiting the FOX 10 Phoenix weather page, or download the Free FOX 10 Weather app, which is available on Apple iOS and Android.
Scroll down this page for satellite and radar, day planner, records, current temperatures, 10-day forecast, forecast highs, and recent rainfall totals, plus live video feeds.
Driving in extreme temperatures
The Arizona Department of Transportation’s tips for driving in extreme temperatures include:
Have sun protection: In addition to an umbrella, take sunscreen and a wide-brimmed hat and wear loose-fitting, light-colored cotton clothing.
Fuel up: Keep your tank at three-quarters full. Running out of gas, especially in a remote location, is dangerous in extreme heat.
Hydrate: Take a cooler to keep extra drinking water cold, and consider adding several frozen bottles of water to use for cooling off or to thaw and drink if needed. Make sure everyone, including pets, stays hydrated.
Get help: If your vehicle breaks down in extreme heat, call for assistance right away to reduce wait time, and run the AC. If the AC isn’t working, roll down all windows.
Wait safely: If the temperature inside your vehicle becomes too hot, everyone, including pets, should exit carefully and seek out or create a shaded area as far away from the travel lanes as possible. Be careful walking on the road surface, which can be hot enough to burn skin. Keep your shoes on and try to keep your pets’ paws off the pavement. If you are stopped along the highway, raise the front hood and turn on hazard lights. Please keep in mind that parking in tall brush can start a fire.
Check your vehicle: You can help avoid breakdowns and blowouts by making sure your vehicle is in good operating condition. Check your air conditioner and coolant levels, top off any vital engine fluids and make sure your battery is up to par. Check your tire pressure, as the combination of under inflated tires and hot pavement can lead to a blowout.
MORE: https://azdot.gov/about/transportation-safety/severe-weather
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The following heat safety information was provided by the Scottsdale Fire Department:
What are Heat Emergencies?
Heat Cramps: Profuse sweating, fatigue, extreme thirst, muscle cramps
Heat Exhaustion: Headache, dizziness, weakness, nausea/vomit, Cool/moist skin
Heat Stroke: Elevated temp. +103degrees, confusion/irrational behavior, dry/hot skin, rapid shallow breathing, rapid weak pulse (shock), seizures, unconscious
What to do
- Get person into shade or cool location
- Cool person with cool, wet cloths (neck, groin, armpits, head) and fan body
- Sip cool water if person is alert
- For muscle cramps, massage muscles gently, but firmly until relaxed
- *If symptoms worsen, call 911
What not to do
- Do not give anything by mouth if person is vomiting, unable to swallow or unconscious
- Do not underestimate the seriousness of a heat emergency
- Prevention/Preparation for hike/exercise in heat
Know your limitations
- Hydrate (begins day prior to hike/exercise, hour before hike, during and after)
- Wear proper clothing, lightweight and light color, protect head, proper shoes
- Always carry a cell phone and best to hike with company
- Always tell someone where you are hiking and when to plan to return
Preventing heat exhaustion/heat stroke
The Arizona Department of Health Services stated the following precautions can be taken to prevent heat exhaustion or heat stroke:
- Stay in air-conditioned buildings
- Find a cooling center/hydration station
- Limit outdoor activity during the hottest part of the day (mid-day)
- Check on at-risk friends, family, and neighbors at least twice a day
- Drink water before, during, and after working or exercising outside
- Check the UV Index
- Check the heat risk map
Road Conditions
- Call 511 anywhere in Arizona or 1-888-411-ROAD (7623)
- az511.com
The Source: Information for this story was provided by the FOX 10 Weather Experts.