Today will be the hottest day of the week, with mostly sunny skies and a high of 91. The heat index will make it feel even hotter. It’s also a Code Yellow air quality day for both ozone and particle pollution. Unusually sensitive people will be affected.

We’ll have a little patchy fog before 9. Wind will be calm, becoming southwest around 6 mph this afternoon.

Tonight will be partly cloudy and 72, with south wind at 3-5 mph.

Friday will start with patchy fog again, then it will become mostly sunny, with a high of 89. A 30 percent chance of showers and thunderstorms will be mainly after noon. Less than a tenth of an inch of rain is expected.

Friday night will also have a 30 percent chance of showers and storms, and some could become severe, with gusty winds and frequent lightning. The low will be 71, with mostly cloudy skies and southwest wind at 3-6 mph. Less than a tenth of an inch of rain is possible.

Saturday has a 60 percent chance of showers and thunderstorms, mainly after 1 p.m. It will be partly sunny and 86, with west southwest wind at 3-7 mph. Again, some of the storms could become severe, and heavy rains might lead to minor flooding.

Sunday has a 50 percent chance of showers and thunderstorms. It will be partly sunny and 85. The chance of showers and storms drops to 30 percent Sunday night. It will be mostly cloudy and 69.

Monday’s chance of showers and thunderstorms will be 40 percent. It will be mostly cloudy and 83. The chance of rain goes down to 30 percent Monday night. It will be mostly cloudy and 70.

Tuesday will have a 50 percent chance of showers and storms, but will be partly sunny and 86. The low will be 69, with mostly cloudy skies and a 30 percent chance of showers and storms.

Wednesday will be mostly sunny and 85, with a 30 percent chance of showers and storms.