Weather in Foster City, CA
Foster City, Wednesday, 21 October, 02:09
Overcast. Feels like 59°. High 69°, low 56°.
Monthly outlook for Foster City, CA: average high 65.5°, average low 56.7°. That is 1.1° below the climate normal for October. Precipitation is expected on 4 days (about 1.7 inches), against a normal of 2 days and 0.7 inches. The warmest day looks like 22 October (69°), the coolest 5 November (52.7°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 21 October – 30 October | 66.5° | 68° | -0.8° |
| 31 October – 9 November | 63.7° | 65.6° | -1° |
| 10 November – 19 November | at normal | 62.2° | — |
October records over 66 years
0.19
Foster City, Thursday, 22 October
Rain. High 69°, low 54°.
0Foster City, Friday, 23 October
Overcast. High 65°, low 58°.
0
Foster City, Saturday, 24 October
Mostly clear. High 66°, low 55°.
0Foster City, Sunday, 25 October
Overcast. High 66°, low 56°.
0
Foster City, Monday, 26 October
Partly cloudy. High 64°, low 57°.
0Foster City, Tuesday, 27 October
Mostly clear. High 67°, low 58°.
0Foster City, Wednesday, 28 October
Overcast. High 67°, low 57°.
0Foster City, Thursday, 29 October
Overcast. High 68°, low 61°.
0.14Foster City, Friday, 30 October
Light rain. High 65°, low 61°.
0.09Foster City, Saturday, 31 October
Light rain. High 68°, low 60°.
1.28Foster City, Sunday, 1 November
Rain. High 61°, low 57°.
0Foster City, Monday, 2 November
Light rain. High 61°, low 55°.
0Foster City, Tuesday, 3 November
Mostly clear. High 62°, low 54°.
0
Foster City, Wednesday, 4 November
Clear. High 64°, low 54°.
0Foster City, Thursday, 5 November
Overcast. High 66°, low 53°.
0.05Foster City, Friday, 6 November
Climate normal for this date — 60-year average.
0.07Foster City, Saturday, 7 November
Climate normal for this date — 60-year average.
0.08Foster City, Sunday, 8 November
Climate normal for this date — 60-year average.
0.07Foster City, Monday, 9 November
Climate normal for this date — 60-year average.
0.11Foster City, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.09Foster City, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.07Foster City, Thursday, 12 November
Climate normal for this date — 60-year average.
0.12Foster City, Friday, 13 November
Climate normal for this date — 60-year average.
0.06Foster City, Saturday, 14 November
Climate normal for this date — 60-year average.
0.07Foster City, Sunday, 15 November
Climate normal for this date — 60-year average.
0.1Foster City, Monday, 16 November
Climate normal for this date — 60-year average.
0.12Foster City, Tuesday, 17 November
Climate normal for this date — 60-year average.
0.06Foster City, Wednesday, 18 November
Climate normal for this date — 60-year average.
0.04Foster City, Thursday, 19 November
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 Foster City, 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 Foster City, 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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