Weather in Herndon, CA
Herndon, Monday, 19 October, 15:45
Mostly clear. Feels like 82°. High 84°, low 55°.
Monthly outlook for Herndon, CA: average high 77.1°, average low 56.5°. That is 1.5° above the climate normal for October. Precipitation is expected on 3 days (about 1.7 inches), against a normal of 1 days and 0.5 inches. The warmest day looks like 28 October (85.2°), the coolest 24 October (49°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 78.1° | 76.1° | +1.1° |
| 29 October – 7 November | 75.4° | 71.1° | +2.4° |
| 8 November – 17 November | at normal | 66.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Fresno (8 mi).
0
Herndon, Tuesday, 20 October
Overcast. High 81°, low 52°.
0.01
Herndon, Wednesday, 21 October
Light rain. High 69°, low 55°.
0.09Herndon, Thursday, 22 October
Light rain. High 72°, low 54°.
0
Herndon, Friday, 23 October
Partly cloudy. High 70°, low 52°.
0
Herndon, Saturday, 24 October
Clear. High 73°, low 49°.
0Herndon, Sunday, 25 October
Partly cloudy. High 82°, low 53°.
0Herndon, Monday, 26 October
Overcast. High 84°, low 59°.
0Herndon, Tuesday, 27 October
Overcast. High 82°, low 60°.
0Herndon, Wednesday, 28 October
Overcast. High 85°, low 59°.
0Herndon, Thursday, 29 October
Overcast. High 84°, low 62°.
0Herndon, Friday, 30 October
Overcast. High 78°, low 58°.
0Herndon, Saturday, 31 October
Overcast. High 79°, low 60°.
0.08Herndon, Sunday, 1 November
Light rain. High 76°, low 58°.
1.56Herndon, Monday, 2 November
Heavy rain. High 65°, low 60°.
0Herndon, Tuesday, 3 November
Overcast. High 70°, low 58°.
0.02Herndon, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.02Herndon, Thursday, 5 November
Climate normal for this date — 60-year average.
0.04Herndon, Friday, 6 November
Climate normal for this date — 60-year average.
0.06Herndon, Saturday, 7 November
Climate normal for this date — 60-year average.
0.09Herndon, Sunday, 8 November
Climate normal for this date — 60-year average.
0.06Herndon, Monday, 9 November
Climate normal for this date — 60-year average.
0.05Herndon, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.08Herndon, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.06Herndon, Thursday, 12 November
Climate normal for this date — 60-year average.
0.09Herndon, Friday, 13 November
Climate normal for this date — 60-year average.
0.07Herndon, Saturday, 14 November
Climate normal for this date — 60-year average.
0.04Herndon, Sunday, 15 November
Climate normal for this date — 60-year average.
0.06Herndon, Monday, 16 November
Climate normal for this date — 60-year average.
0.13Herndon, Tuesday, 17 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 Herndon, 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 Herndon, 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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