Weather in Herndon, VA
Herndon, Thursday, 15 October, 00:38
Overcast. Feels like 74°. High 73°, low 58°.
Monthly outlook for Herndon, VA: average high 66.2°, average low 50.7°. That is 1.5° above the climate normal for October. Precipitation is expected on 7 days (about 1.7 inches), against a normal of 4 days and 1.9 inches. The warmest day looks like 16 October (83.5°), the coolest 18 October (40.9°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 15 October – 24 October | 67.5° | 64.7° | +1.6° |
| 25 October – 3 November | 64° | 61.6° | +1.4° |
| 4 November – 13 November | at normal | 57.1° | — |
October records over 66 years
0.15
Herndon, Friday, 16 October
Rain. High 83°, low 58°.
0.04Herndon, Saturday, 17 October
Light rain. High 60°, low 47°.
0
Herndon, Sunday, 18 October
Clear. High 57°, low 41°.
0Herndon, Monday, 19 October
Clear. High 62°, low 41°.
0Herndon, Tuesday, 20 October
Clear. High 67°, low 42°.
0Herndon, Wednesday, 21 October
Clear. High 68°, low 49°.
0
Herndon, Thursday, 22 October
Mostly clear. High 67°, low 50°.
0Herndon, Friday, 23 October
Clear. High 68°, low 50°.
0Herndon, Saturday, 24 October
Clear. High 70°, low 51°.
0Herndon, Sunday, 25 October
Clear. High 70°, low 51°.
0.07Herndon, Monday, 26 October
Light rain. High 64°, low 56°.
0.22Herndon, Tuesday, 27 October
Light rain. High 62°, low 55°.
0.74Herndon, Wednesday, 28 October
Rain. High 61°, low 56°.
0.39Herndon, Thursday, 29 October
Rain. High 65°, low 54°.
0Herndon, Friday, 30 October
Clear. High 62°, low 51°.
0.06Herndon, Saturday, 31 October
Climate normal for this date — 60-year average.
0.08
Herndon, Sunday, 1 November
Climate normal for this date — 60-year average.
0.12Herndon, Monday, 2 November
Climate normal for this date — 60-year average.
0.05Herndon, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.11Herndon, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.08Herndon, Thursday, 5 November
Climate normal for this date — 60-year average.
0.07Herndon, Friday, 6 November
Climate normal for this date — 60-year average.
0.1Herndon, Saturday, 7 November
Climate normal for this date — 60-year average.
0.16Herndon, Sunday, 8 November
Climate normal for this date — 60-year average.
0.06Herndon, Monday, 9 November
Climate normal for this date — 60-year average.
0.13Herndon, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.18Herndon, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.22
Herndon, Thursday, 12 November
Climate normal for this date — 60-year average.
0.09Herndon, Friday, 13 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, VA 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, VA 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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