The upcoming week will bring extreme heat on Monday and chances of heavy rain and flash floods by Friday, according to the National Weather Service.
Temperatures will increase throughout the weekend, bringing Saturday’s high to 105 degrees, Sunday’s high to 108 and Monday’s high to 109 before dropping back down Tuesday to 106, forecasters say.
“We have an extreme heat warning in effect for Monday for Pima County, southeast Pinal County and Graham county,†said National Weather Service forecaster Chris Rasmussen. “It’s important to stay hydrated, stay of of the direct sun and find ways to cool down in the afternoon.â€
Monday and Tuesday will bring a slight chance of isolated thunderstorms before increasing throughout the rest of the week.
There’s a 50% chance of rain Wednesday and 60% chance Thursday, with flash flood concerns that could carry over to Friday, July 4.
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While slight rain is typical starting Independence Day weekend, this year’s monsoon is starting off with heavier rainfall, Rasmussen said.
“The type of storms we’re looking for are not going to be your average monsoon type,†he said. “It’ll be a little bit more active.
The National Weather Service has recorded traces of rain four times on July 4 in the last decade. The highest amount of rainfall recorded was 0.78†in 2012.
Rasmussen said as of now, it’s hard to say what time of day Friday’s thunderstorms will occur.
As of Friday, firework celebrations across Pima County are still scheduled as usual.

People walk through a shaft of evening sunlight slicing down on West Congress Street between downtown Tucson high-rise buildings. The next few days will be hot and sunny, but the forecast calls for rainy days during the Fourth of July weekend.