Weather
Arizona Weather Alert: 70% Rain Chance in Tucson Wednesday Night Oct 21
Tucson, AZ – Southern Arizona residents face an unsettled stretch of weather this week as temperatures approach 90 degrees before showers and thunderstorms become more likely. Tucson could see a notic
By Jenna Hartley · 2026-10-19T09:59:49.321Z
Tucson, AZ – Southern Arizona residents face an unsettled stretch of weather this week as temperatures approach 90 degrees before showers and thunderstorms become more likely. Tucson could see a noticeable cooldown by Friday, with daytime highs dropping into the 70s.
According to the National Weather Service in Tucson, showers and thunderstorms are possible throughout portions of the week, with precipitation chances reaching 70% Wednesday night and Thursday. The forecast, updated Sunday, Oct. 18, covers a location approximately two miles north of South Tucson in Pima County.
Tucson could reach 90 degrees before storms increase Monday brings a 50% chance of showers and thunderstorms, mainly between 8 a.m. and 5 p.m., with a high near 85 degrees.
Tuesday is expected to be the warmest day, reaching approximately 90 degrees under mostly sunny skies. A 20% chance of afternoon thunderstorms remains possible.
By Wednesday, temperatures could reach 89 degrees before showers and thunderstorms develop, mainly after 11 a.m. The precipitation probability increases to 50%.
Wednesday night brings a 70% chance of precipitation, with showers becoming likely after 11 p.m. and thunderstorms remaining possible.
Thursday continues the unsettled pattern, with a 70% chance of showers and possible thunderstorms. Afternoon temperatures are expected to fall to approximately 81 degrees.
Cooler temperatures arrive before the weekend By Friday, Tucson's high could drop to 76 degrees, a 14 degree decline from Tuesday.
Friday night temperatures are forecast near 53 degrees, followed by sunshine and a high near 78 Saturday.
Sunday brings another sunny afternoon, with temperatures approaching 82 degrees.
The combination of changing temperatures and repeated thunderstorm chances could affect outdoor plans and travel across Tucson and surrounding Pima County communities.
Residents should monitor updated National Weather Service forecasts for changes in storm timing and any additional weather alerts.