textproduct: San Diego

SYNOPSIS

Widespread Major to locally Extreme HeatRisk will continue for the coastal areas into the western valleys through Thursday with high temperatures for the valleys of 100 to 105 each day. A low pressure system developing over the western states for Monday of next week will bring a cooling trend for Friday through next weekend with high temperatures cooling to 4 to 8 degrees below average for next Sunday.

SHORT TERM (Today through Wednesday)

A weak sea breeze will cool high temperatures near the coast a few more degrees today with not much change farther inland with the hottest high temperatures for today, of 100 to 105, for the western valleys and inland Orange County. Onshore flow on Tuesday will cool high temperatures a few more degrees along the coast with slight cooling extending inland into the valleys. On Wednesday, high temperatures will cool a few more degrees near the coast with the mountains, deserts, and inland valleys warming a few to around 5 degrees.

On Wednesday, high temperatures will still be mostly 15 to 20 degrees above average for the valleys and inland coastal areas with the coast 10 to 15 degrees above average. High temperatures on Wednesday will be in the mid 80s to lower 90s near the coast to the upper 90s to 105 for the Inland Empire.

LONG TERM (Thursday through Sunday)

On Thursday, there will only be slight changes in high temperatures for most areas with inland Orange County and the Inland Empire cooling a few to around 5 degrees. A low pressure system developing over the western states for Monday of next week will bring a cooling trend for Friday through next weekend with high temperatures cooling a few to around 5 degrees on Friday and another 4 to 8 degrees on Saturday and again on Sunday. High temperatures on Sunday will be around 4 to 8 degrees below average, ranging from the 70s near the coast to the lower to mid 80s for the Inland Empire with the lower deserts in the lower to mid 90s.

AVIATION

051130Z...SKC and VFR today and tonight. Local easterly breezes through 20Z gusting to 25 knots in foothills and eastern valleys. MOD UDDFS expected over coastal slopes.

MARINE

No hazardous marine conditions are expected through Friday.

BEACHES

Increasing south swell this week, along with high tides during the evenings could lead to minor coastal flooding and beach erosion. A Beach Hazards Statement contains the details.

CLIMATE

San Diego International Airport had a high temperature of 105 on Saturday and 100 on Sunday, both new daily record high temperatures. Prior to this past weekend, the last time San Diego had a high temperature of 100 or higher was in 2020 on September 6th at 100. The last time San Diego had a high temperature of 100 or higher more than once in a year was in 1979 with high temperatures of 101 on June 10th and 100 on September 15th. The last time San Diego had a high temperature of 100 or higher on consecutive days was in 1965 on October 21st and 22nd at 101 and 104.

Consecutive days with high temperatures of 100 or higher at San Diego has now only happened four times with temperature records dating back to 1874. That also happened in 1963 in September on the 26th and 27th with 111 and 104 with 111 the all-time record high temperature for San Diego. It also happened in 1939 on three consecutive days on September 20th through 22nd with high temperatures of 100, 106, and 102. That was during the heatwave that preceded the tropical storm that made landfall near San Pedro on September 25th, 1939.

San Diego has now had high temperatures of 100 or higher on only 31 days since 1874, 27 of which were in September (20) or October (7).

There have been only three times that San Diego has had a low temperature of 74 or higher with a high temperature of 100 or higher. There were low temperatures in 1939 of 74 on September 20th and 76 on September 21st. The low temperature on Sunday, October 4th of this year was 74, tied for the second warmest low temperature on a day with a high temperature of 100 or higher.

SKYWARN

Skywarn activation is not requested. However weather spotters are encouraged to report significant weather conditions.

SGX WATCHES/WARNINGS/ADVISORIES

CA...Extreme Heat Warning until 8 PM PDT Thursday for Orange County Coastal Areas-Orange County Inland Areas-San Bernardino and Riverside County Valleys-The Inland Empire-San Diego County Coastal Areas-San Diego County Valleys-Santa Ana Mountains and Foothills.

Beach Hazards Statement from Tuesday afternoon through Friday evening for Orange County Coastal Areas-San Diego County Coastal Areas.

PZ...None.