Phoenix Rain Chances Rise From Tropical Moisture and Storm Remnants
- Tropical moisture streaming from Hurricane Polo and Odalys will reach the Desert Southwest on Sunday, September 27, 2026, bringing cooler temperatures and increasing rain chances across Arizona through...
- Phoenix is expected to see temperatures climb to a high of 100 degrees on Saturday, September 26, 2026, which is two degrees above average, according to KTVK/KPHO.
- Abundant moisture from Tropical Cyclones Polo and Odalys is funneling into the region, leading to humid, cloudy, and rainy conditions, according to KYMA.
Tropical moisture streaming from Hurricane Polo and Odalys will reach the Desert Southwest on Sunday, September 27, 2026, bringing cooler temperatures and increasing rain chances across Arizona through early next week, according to regional forecasts.
Phoenix and Valley Forecast
Phoenix is expected to see temperatures climb to a high of 100 degrees on Saturday, September 26, 2026, which is two degrees above average, according to KTVK/KPHO. A few clouds will begin rolling in on Sunday, September 27, 2026, as tropical systems push moisture through the state. Remnants of these systems bring a slight chance of rain on Sunday afternoon, September 27, 2026, with higher rain chances anticipated on Monday, September 28, 2026, and Tuesday, September 29, 2026. KTVK/KPHO issued a First Alert for both Monday and Tuesday due to the potential for rain and thunderstorms, noting that the heaviest rainfall will fall in Eastern Arizona while the Valley will also receive measurable precipitation.
Regional Moisture From Tropical Cyclones Polo and Odalys
Abundant moisture from Tropical Cyclones Polo and Odalys is funneling into the region, leading to humid, cloudy, and rainy conditions, according to KYMA. KYMA reports that Hurricane Polo strengthened into a Category 5 hurricane before expected weakening, with its path moving northeast toward the Baja Peninsula by early next week. While the storms are not expected to make direct landfall in the local area, the associated moisture will generate rounds of showers with rain chances sitting between 10% and 50% from Sunday night, September 27, 2026, through Tuesday, September 29, 2026, as reported by KYMA. FOX 10 Phoenix notes that low pressure to the west is helping stream this moisture into the region, with strong thunderstorms possible in high terrain areas.
Temperature Drops and Expected Rainfall Accumulation
Rainfall totals between Sunday, September 27, 2026, and Monday, September 28, 2026, are projected to be low, ranging from less than a tenth of an inch on the low end, though heavier storms could produce localized flooding and higher totals, according to KYMA. The incoming tropical moisture will allow temperatures to cool significantly early in the week, with FOX 10 Phoenix reporting that highs in the Valley will drop into the 80s on Monday, September 28, 2026. KYMA reports that regional highs will fall into the low 90s, with overnight lows reaching the low 70s and upper 60s, before a dry and seasonable close to the monsoon season arrives by Wednesday, September 30, 2026.
