Increased moisture will combine with warm temperatures to bring muggy conditions to the Sacramento region, as well as thunderstorms and some rain.
A low-pressure system dropping in from Canada and the remnants of Hurricane Dolores in the Pacific are providing the moisture that will increase the chance of rain in Sacramento and thunderstorms south of the capital and in the mountains.
“It’ll probably feel muggier, more humid than we’re used to just because we’re getting that tropical air,” said Eric Kurth, a National Weather Service meteorologist in Sacramento.
Sunday is predicted to be the warmest day of the week at 98 degrees in Sacramento. Rain is possible, but just sprinkles.
It will most likely begin raining Sunday night and continue through Monday, Kurth said. By Tuesday, what’s left of Dolores will have moved on to the Sierras, leaving Sacramento and the valley dry again.
Thunderstorms in the mountains and the valley farther south are expected to bring more than an inch of rain to some locations.
Daniel Berlant of the California Department of Forestry and Fire Protection warned that lightning strikes pose increased fire risks.
“Even though this storm is likely to bring some isolated rain with it, in some areas you may have rain but in other areas the lightning may be able to strike outside where that rain is occurring,” he said. “There may not be wetting rains where that lighting actually strikes the ground.”
This means wildfires are possible, he said, adding to the well above-average number of fires to which Cal Fire has responded this season.
“Conditions are so much drier with the drought that it doesn’t take much for something to spark a wildfire,” he said. “We’re going to need a fair amount of rainfall to get rid of any threat of lightning spark fires.”
High temperatures gradually will dip down to a low of 88 degrees on Thursday and stay near 90 degrees through the weekend, according to the NWS.
Here’s this week’s forecast:
Sunday: Mostly sunny and hot, with a high near 98. Calm wind becoming northwest around 6 mph in the afternoon.
Sunday night: Increasing clouds with a chance of sprinkles. Mostly cloudy, with a low around 71. South wind 6 to 13 mph, with gusts as high as 20 mph.
Monday: A 20 percent chance of showers and thunderstorms. Partly sunny, with a high near 95. South-southeast wind 5 to 7 mph becoming calm in the morning.
Monday night: A chance of sprinkles. Mostly cloudy, with a low around 67. South-southeast wind 9 to 11 mph.
Tuesday: Mostly sunny, with a high near 95. South-southwest wind around 7 mph.
Tuesday night: Mostly clear, with a low around 62.
Wednesday: Sunny, with a high near 92.
Wednesday night: Mostly clear, with a low around 60.
Thursday: Sunny, with a high near 88.
Thursday night: Mostly clear, with a low around 59.
Friday: Sunny, with a high near 90.
Friday night: Mostly clear, with a low around 60.
Saturday: Sunny, with a high near 91.