SAN DIEGO – Freeze warnings were in effect in San Diego County valleys and deserts and a frost advisory was in effect in San Diego County coastal areas overnight, according to the National Weather Service.
The warnings and advisory expired at 8 a.m. Sunday.
Lows are forecast in the 20s in the valleys and lower deserts and the 30s in the coastal areas.
Additionally, a high surf advisory and coastal flood advisory are in effect.
In the outer coastal waters, northwest winds of 20 to 25 knots and rough seas around 10 feet will make conditions hazardous for small craft.
Very cold nights are also forecast through Tuesday, with lows in the 20s in the wind-sheltered valleys and lower deserts and widespread frost likely.
A hard freeze is likely in those areas most susceptible to the cold, according to the NWS.