The summer heat, increased moisture, and high humidity are the perfect recipe for thunderstorms that produce heavy rain and wind.
The storms can also kick up walls of dust as they move over the dry desert landscape.
Last year the Monsoon got a late start, but it ended up being the 7th wettest on record, causing flooding around the state.
FOX 10 returned to a neighborhood that was a real problem last season near 19th Avenue and Dobbins. How are residents preparing for the coming storms?
Despite her family's home at the base of South Mountain flooding during Monsoon 2014, Vanessa James is not too aware or concerned about Monsoon 2015.
"Just pay attention to the weather, if we see clouds you know," said Vanessa James.
Vanessa thinks the storm that caused the massive runoff from South Mountain on August 12, that turned Dobbins Road into a river, sending over a foot of water into her home, will not happen again.
"I don't think so, I think we will be okay, it's just a freak storm really," she said.
Her husband, Brian, on the other hand, is at the other end of the spectrum.
"Oh yeah, I'm ready," said Brian James.
He is, as they say, loaded for bear.
"We got two big pumps that could pump out 500 gallons per minute," he said.
They also have extra lengths of hose stored in the garage.
On the side of that garage is a mark that shows how high the water got last year.
"We got sandbags from last year that I'm ready to re-bag," said Brian.
He agrees with his wife that Monsoon 2015 probably won't be as bad as last season, but he figures, why risk it.
"No, we don't want to be in that situation if we can help it, now that we're aware it can happen, so that is what we're doing," said Brian.
Officials encourage everyone to have a plan. Monsoon means dust storms, rain, lightning, and a host of weather than can lead to big problems, but can be catastrophic if you're not prepared.