Weather in San Mateo, CA
San Mateo, Saturday, 8 August, 20:16
Mostly clear. Feels like 64°. High 86°, low 60°.
Monthly outlook for San Mateo, CA: average high 72.6°, average low 57.3°. That is 0.7° below the climate normal for August. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 0 days and 0.1 inches. The warmest day looks like 9 August (88.4°), the coolest 19 August (55.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 75° | 74.2° | +0.4° |
| 18 August – 27 August | 68.6° | 73.8° | -2.9° |
| 28 August – 6 September | at normal | 75.6° | — |
August records over 66 years
0
San Mateo, Sunday, 9 August
Clear. High 88°, low 63°.
0San Mateo, Monday, 10 August
Clear. High 78°, low 56°.
0
San Mateo, Tuesday, 11 August
Mostly clear. High 73°, low 56°.
0
San Mateo, Wednesday, 12 August
Partly cloudy. High 71°, low 57°.
0
San Mateo, Thursday, 13 August
Overcast. High 72°, low 58°.
0San Mateo, Friday, 14 August
Clear. High 70°, low 56°.
0San Mateo, Saturday, 15 August
Clear. High 71°, low 57°.
0San Mateo, Sunday, 16 August
Overcast. High 71°, low 57°.
0San Mateo, Monday, 17 August
Overcast. High 70°, low 58°.
0San Mateo, Tuesday, 18 August
Partly cloudy. High 69°, low 56°.
0San Mateo, Wednesday, 19 August
Mostly clear. High 69°, low 56°.
0San Mateo, Thursday, 20 August
Overcast. High 66°, low 57°.
0San Mateo, Friday, 21 August
Clear. High 70°, low 56°.
0San Mateo, Saturday, 22 August
Overcast. High 69°, low 57°.
0San Mateo, Sunday, 23 August
Mostly clear. High 69°, low 56°.
0San Mateo, Monday, 24 August
Climate normal for this date — 60-year average.
0San Mateo, Tuesday, 25 August
Climate normal for this date — 60-year average.
0San Mateo, Wednesday, 26 August
Climate normal for this date — 60-year average.
0San Mateo, Thursday, 27 August
Climate normal for this date — 60-year average.
0San Mateo, Friday, 28 August
Climate normal for this date — 60-year average.
0San Mateo, Saturday, 29 August
Climate normal for this date — 60-year average.
0San Mateo, Sunday, 30 August
Climate normal for this date — 60-year average.
0San Mateo, Monday, 31 August
Climate normal for this date — 60-year average.
0San Mateo, Tuesday, 1 September
Climate normal for this date — 60-year average.
0San Mateo, Wednesday, 2 September
Climate normal for this date — 60-year average.
0San Mateo, Thursday, 3 September
Climate normal for this date — 60-year average.
0San Mateo, Friday, 4 September
Climate normal for this date — 60-year average.
0San Mateo, Saturday, 5 September
Climate normal for this date — 60-year average.
0San Mateo, Sunday, 6 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 San Mateo, 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 San Mateo, 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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