Weather in Lake San Marcos, CA
Lake San Marcos, Sunday, 9 August, 09:29
Clear. Feels like 77°. High 89°, low 71°.
Monthly outlook for Lake San Marcos, CA: average high 82.7°, average low 68.6°. That is 1.8° above the climate normal for August. Precipitation is expected on 1 day (about 0.1 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 9 August (89.1°), the coolest 13 August (64.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 81.2° | 79.5° | +0.9° |
| 19 August – 28 August | 85.4° | 80.1° | +3° |
| 29 August – 7 September | at normal | 81.1° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Carlsbad (4 mi).
0Lake San Marcos, Monday, 10 August
Clear. High 89°, low 68°.
0
Lake San Marcos, Tuesday, 11 August
Light rain. High 82°, low 68°.
0Lake San Marcos, Wednesday, 12 August
Clear. High 80°, low 66°.
0
Lake San Marcos, Thursday, 13 August
Overcast. High 76°, low 65°.
0Lake San Marcos, Friday, 14 August
Overcast. High 73°, low 65°.
0Lake San Marcos, Saturday, 15 August
Overcast. High 80°, low 66°.
0.01Lake San Marcos, Sunday, 16 August
Light rain. High 80°, low 68°.
0
Lake San Marcos, Monday, 17 August
Partly cloudy. High 80°, low 67°.
0Lake San Marcos, Tuesday, 18 August
Partly cloudy. High 83°, low 68°.
0Lake San Marcos, Wednesday, 19 August
Clear. High 86°, low 70°.
0.06Lake San Marcos, Thursday, 20 August
Light rain. High 86°, low 71°.
0Lake San Marcos, Friday, 21 August
Clear. High 86°, low 72°.
0Lake San Marcos, Saturday, 22 August
Overcast. High 84°, low 71°.
0Lake San Marcos, Sunday, 23 August
Clear. High 84°, low 70°.
0Lake San Marcos, Monday, 24 August
Clear. High 87°, low 71°.
0
Lake San Marcos, Tuesday, 25 August
Climate normal for this date — 60-year average.
0Lake San Marcos, Wednesday, 26 August
Climate normal for this date — 60-year average.
0Lake San Marcos, Thursday, 27 August
Climate normal for this date — 60-year average.
0Lake San Marcos, Friday, 28 August
Climate normal for this date — 60-year average.
0Lake San Marcos, Saturday, 29 August
Climate normal for this date — 60-year average.
0Lake San Marcos, Sunday, 30 August
Climate normal for this date — 60-year average.
0Lake San Marcos, Monday, 31 August
Climate normal for this date — 60-year average.
0Lake San Marcos, Tuesday, 1 September
Climate normal for this date — 60-year average.
0Lake San Marcos, Wednesday, 2 September
Climate normal for this date — 60-year average.
0Lake San Marcos, Thursday, 3 September
Climate normal for this date — 60-year average.
0Lake San Marcos, Friday, 4 September
Climate normal for this date — 60-year average.
0Lake San Marcos, Saturday, 5 September
Climate normal for this date — 60-year average.
0Lake San Marcos, Sunday, 6 September
Climate normal for this date — 60-year average.
0Lake San Marcos, Monday, 7 September
Climate normal for this date — 60-year average.
About the monthly outlook
How accurate is a 30-day forecast?
The first 16 days come from weather models — reliable for the first 3–5 days and progressively less so after that. Days 17 through 30 for Lake San Marcos, CA are built from the climate normal, the 60-year average, so they show typical weather for those dates rather than a specific forecast.
What does "above normal" mean?
We compare the forecast against the climate normal for those exact calendar days, computed from 60 years of observations. The deviation shows how much the coming month differs from a typical one.
Where do the 66-year records come from?
They are real temperature extremes recorded in Lake San Marcos, CA since 1960: the highest and lowest reading for each calendar date, with the year it happened.
How often is it updated?
The forecast portion refreshes every hour; the climate portion is based on long-term data and stays stable.
Sun and moon today
Weather history
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