SAN DIEGO — We started off the work week with near seasonal temperatures for most of the county. The biggest gap was in the inland valleys, where some spots strayed away from the 84° seasonal norm.
For the rest of the night, coastal low clouds will continue to move east and stack up west of the mountains. There is the potential for patchy overnight fog in spots along with patchy drizzle through Tuesday morning.
- Coast: low 60s
- Inland: low 60s
- Mountains: low 50s
- Desert: mid to upper 60s
As a trough of low pressure moves in over the West, temperatures take a slight dip on Tuesday as onshore flow strengthens.
Tuesday afternoon high temperatures will be below seasonal averages across the whole county.
- Coastal highs around 68°, normal around 72°
- Inland highs around 74°, normal around 84°
- Mountain highs around 75°, normal around 80°
- Desert highs around 101°, normal around 104°
The UV index will peak at 10 Tuesday, which is considered very high. Sun protection is needed, UV radiation from the sun will cause skin damage. The time between 10 AM and 4 PM is when UV radiation from the sun is at its maximum.
A trough of low pressure from the Eastern Pacific will linger over the Pacific Northwest through midweek. This will keep temperatures a few degrees below average.
Marine layer clouds should weaken for the second half of the week. This will be courtesy of a ridge of high pressure strengthening over Southern California starting Thursday.