High pressure ridging brought the first major heat event of the year to Northern California. Widespread moderate to high heat risk impacted the region Memorial Day weekend and into the first few days of June. Some Valley locations reached over 100 degrees for the first time this year. Temperatures generally reached upwards of 20 to 25 degrees above climatology. Several new daily high temperature records and one record monthly high temperature record were set in the area at the peak of the heatwave on the last day of May. There were three cooling centers open in Sacramento County, one in Yolo County, one in Butte County and one in San Joaquin County.

Excessive Heat in MOUNTAINS SOUTHWESTERN SHASTA COUNTY TO WESTERN COLUSA COUNTY, CALIFORNIA
From 01-JUN-21 00:00:00 to 03-JUN-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the peak of the heat wave on the 31st, The western foothills of the Sacramento Valley saw high temperatures reach 102 to 103 degrees.

Excessive Heat in NORTHEAST FOOTHILLS/SACRAMENTO VALLEY, CALIFORNIA
From 01-JUN-21 00:00:00 to 03-JUN-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the peak of the heat wave on the 31st, the north eastern foothills of the Sacramento Valley saw high temperatures reach mid 90s to just over 100 degrees.

Excessive Heat in NORTHERN SAN JOAQUIN VALLEY, CALIFORNIA
From 01-JUN-21 00:00:00 to 01-JUN-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the peak of the heat wave on the 31st, the Northern San Joaquin Valley saw high temperatures reach just over 100 degrees.

Excessive Heat in CENTRAL SACRAMENTO VALLEY, CALIFORNIA
From 01-JUN-21 00:00:00 to 03-JUN-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

The Central Sacramento Valley region saw high temperatures in excess of 105 degrees during the event. At the peak of the heat wave on the 31st, Marysville recorded a high temperature of 106 degrees.

Excessive Heat in MOTHERLODE/CAMPTONVILLE TO GROVELAND, CALIFORNIA
From 01-JUN-21 00:00:00 to 01-JUN-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the peak of the heat wave on the 31st, the Motherlode region saw high temperatures reach in mid 90s to around 100 degrees.

Excessive Heat in SHASTA LAKE/NORTH SHASTA COUNTY, CALIFORNIA
From 01-JUN-21 00:00:00 to 03-JUN-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the peak of the heatwave on the 31st, Lake Shasta Dam saw high temperatures reach 101 degrees during the event.

Excessive Heat in SOUTHERN SACRAMENTO VALLEY, CALIFORNIA
From 01-JUN-21 00:00:00 to 01-JUN-21 02:46:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the peak of the heatwave on the 31st, Downtown Sacramento hit 106 tying the daily high temperature record and Sacramento Executive Airport reached 105 setting a new daily high temperature record.

Excessive Heat in NORTHERN SACRAMENTO VALLEY, CALIFORNIA
From 01-JUN-21 00:00:00 to 03-JUN-21 21:00:00 (PST-8)
Property damage: 0.00K
Crop damage: 0.00K
Reported by: ASOS

At the peak of the heatwave on the 31st, Redding reached 109 breaking both the daily and monthly high temperature records. Red Bluff reached 108, setting a new daily high temperature record.