Temperatures will rise to 82 in Coronado by Wednesday, according to the National Weather Service.
Highs will be in the mid-70s the rest of the week with lows in the low-to-mid 60s.
It is expected to be sunny and mostly clear through Friday when forecasters predict patchy fog in the morning.
Meanwhile, the city of San Diego can expect temperatures to reach the low 90s and East County is likely to see temperatures in the mid-90s.
Coronado's forecast through the week, according to the weather service:
Monday: Sunny, with a high near 76. Calm southwest wind of around 5 mph by the afternoon. Low of 62.
Tuesday: Sunny with a high near 76 and a light north wind becoming a west wind of 5 to 10 mph; low around 63 and a orthwest wind of 5 to 10 mph becoming light and variable in the evening.
Wednesday: Sunny and clear, with a high near 82 and a low around 65.
Thursday: Sunny and a high of 76, with some fog rolling in late and a low of 65.
Friday: Fog not expected to clear until late morning, with a high of 74. Clouds will increase late and the low is expected to be 64.
Saturday and Sunday: Patchy fog before 11 a.m. both days, but clearing slower Sunday. Otherwise, partly sunny, with a high near 72. Lows around 63.