The National Weather Service in Phoenix is predicting a high of 99 degrees on Sunday, but hasn’t ruled out the chance the temperature will hit 100 for the first time this year.

The Sunday forecast will cap a week-long string of temperatures in the 90s, said Marvin Percha, a meteorologist for the National Weather Service in Phoenix.

Percha said high pressure over the Phoenix area is contributing to the temperatures, which are above normal for this time in April, he said.

The historic average high temperature for the week ranges from the mid- to upper 80s, according to the Weather Service.

The Weather Service predicts high temperatures in the low 90s until Friday of this week, according to its website.

The high for Saturday is expected to be 95 degrees before spiking higher on Sunday.

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Percha said that if temperatures hit 100 on Sunday, it will be about a week earlier than normal.

The average first 100-degree day from 1981 to 2010 was May 2, according to the NWS/Weather Service website. Last year, the first 100-degree day in Phoenix occurred May 4.

Percha said there is no rain in sight for the next 10 days.

In addition to high temperatures this week, a weather system north of Arizona will increase winds in the Phoenix area for much of the week.

Winds in the region are predicted to be sustained between 12 to 18 mph with gusts of 25 mph through much of week, according to Percha.

Percha advised residents to stay hydrated and avoid recreation or work outside during the hottest parts of the day if possible.

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