Weather in Port Costa, CA
Port Costa, Tuesday, 10 November, 07:46
Overcast. Feels like 58°. High 78°, low 53°.
Monthly outlook for Port Costa, CA: average high 61.8°, average low 49.8°. That is 0.4° below the climate normal for November. Precipitation is expected on 7 days (about 3.8 inches), against a normal of 4 days and 1.4 inches. The warmest day looks like 10 November (77.7°), the coolest 22 November (45.3°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 10 November – 19 November | 64.3° | 63.5° | +0.4° |
| 20 November – 29 November | 57.8° | 60.3° | -1.4° |
| 30 November – 9 December | at normal | 58.3° | — |
November records over 66 years
Climate normals and records are computed from the nearest reference point — Vallejo (5 mi).
0
Port Costa, Wednesday, 11 November
Mostly clear. High 76°, low 48°.
0Port Costa, Thursday, 12 November
Overcast. High 71°, low 52°.
0.57
Port Costa, Friday, 13 November
Rain. High 63°, low 54°.
0Port Costa, Saturday, 14 November
Mostly clear. High 60°, low 47°.
0.23Port Costa, Sunday, 15 November
Rain. High 61°, low 51°.
0.82Port Costa, Monday, 16 November
Rain. High 56°, low 54°.
0.01Port Costa, Tuesday, 17 November
Light rain. High 61°, low 51°.
0.31Port Costa, Wednesday, 18 November
Rain. High 57°, low 52°.
0
Port Costa, Thursday, 19 November
Clear. High 60°, low 47°.
0Port Costa, Friday, 20 November
Clear. High 60°, low 50°.
0Port Costa, Saturday, 21 November
Clear. High 58°, low 47°.
0Port Costa, Sunday, 22 November
Clear. High 57°, low 45°.
0.05Port Costa, Monday, 23 November
Light rain. High 56°, low 46°.
1.25Port Costa, Tuesday, 24 November
Rain. High 52°, low 48°.
0.58Port Costa, Wednesday, 25 November
Rain. High 63°, low 53°.
0.06
Port Costa, Thursday, 26 November
Climate normal for this date — 60-year average.
0.07Port Costa, Friday, 27 November
Climate normal for this date — 60-year average.
0.11Port Costa, Saturday, 28 November
Climate normal for this date — 60-year average.
0.13Port Costa, Sunday, 29 November
Climate normal for this date — 60-year average.
0.15Port Costa, Monday, 30 November
Climate normal for this date — 60-year average.
0.11Port Costa, Tuesday, 1 December
Climate normal for this date — 60-year average.
0.18Port Costa, Wednesday, 2 December
Climate normal for this date — 60-year average.
0.15Port Costa, Thursday, 3 December
Climate normal for this date — 60-year average.
0.08Port Costa, Friday, 4 December
Climate normal for this date — 60-year average.
0.09Port Costa, Saturday, 5 December
Climate normal for this date — 60-year average.
0.09Port Costa, Sunday, 6 December
Climate normal for this date — 60-year average.
0.09Port Costa, Monday, 7 December
Climate normal for this date — 60-year average.
0.07Port Costa, Tuesday, 8 December
Climate normal for this date — 60-year average.
0.09Port Costa, Wednesday, 9 December
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 Port Costa, 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 Port Costa, 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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