Weather Update: Tuesday, December 11, 2018 at 4:30 a.m.
Cool, seasonal temperatures through Wednesday under low pressure. High pressure builds for a warmer and drier Thursday at the coast and inland. Gusty winds can be expected in the mountains and valleys.
A Detailed Look at December 11th:
High rip current risk. Water temperature 60-62. West-northwest swell mix, heights 4-6 ft. UV index for San Diego is moderate (3).
High temperatures Tuesday mild, near average. Coastal highs 62-66, normal around 65. Inland highs 62-68, normal around 69. Mountain highs 54-60, normal around 52. Desert highs around 68-74, normal around 68.
High clouds that have kept mornings warmer and afternoons cooler will exit the region Monday morning.
Humidity in San Diego County will remain fairly constant and mild. Coastal dew points will fluctuate in the mid to low 50s, with a slight increase near mid-day. Inland dew points between the high 40s and low 50s. Mountains and deserts are dry, with dew points below 40 degrees.
The Week Ahead:
High pressure expected to build in the Great Basin on Thursday. A weak to moderate Santa Ana event is expected as high pressure increases behind a low pressure trough exiting to the east. Inland and coastal temperatures will increase well above seasonal norms Thursday. Winds will be gusty in the mountains and valleys, especially in passes and over ridges.
Temperatures cool in the mountains and westward as another low pressure system moves across the region early this weekend. Onshore flow expected to return, bringing with it low clouds and the possibility of fog.