Weather in Herndon, CA
Herndon, Sunday, 18 October, 05:59
Clear. Feels like 60°. High 90°, low 59°.
Monthly outlook for Herndon, CA: average high 78.2°, average low 57.7°. That is 1.9° above the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 1 days and 0.5 inches. The warmest day looks like 18 October (90.2°), the coolest 23 October (51°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 77.3° | 76.7° | +0.4° |
| 28 October – 6 November | 79.8° | 71.5° | +4.6° |
| 7 November – 16 November | at normal | 66.8° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Fresno (8 mi).
0
Herndon, Monday, 19 October
Overcast. High 81°, low 53°.
0.01
Herndon, Tuesday, 20 October
Light rain. High 74°, low 51°.
0Herndon, Wednesday, 21 October
Overcast. High 66°, low 56°.
0
Herndon, Thursday, 22 October
Partly cloudy. High 71°, low 52°.
0
Herndon, Friday, 23 October
Clear. High 71°, low 51°.
0Herndon, Saturday, 24 October
Clear. High 77°, low 58°.
0Herndon, Sunday, 25 October
Clear. High 79°, low 60°.
0
Herndon, Monday, 26 October
Mostly clear. High 82°, low 61°.
0Herndon, Tuesday, 27 October
Overcast. High 82°, low 64°.
0Herndon, Wednesday, 28 October
Partly cloudy. High 81°, low 59°.
0Herndon, Thursday, 29 October
Partly cloudy. High 77°, low 57°.
0Herndon, Friday, 30 October
Clear. High 79°, low 58°.
0Herndon, Saturday, 31 October
Clear. High 81°, low 60°.
0Herndon, Sunday, 1 November
Overcast. High 80°, low 62°.
0Herndon, Monday, 2 November
Overcast. High 81°, low 62°.
0.03Herndon, Tuesday, 3 November
Climate normal for this date — 60-year average.
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.
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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