Weather in Herndon, VA
Herndon, Monday, 12 October, 00:14
Overcast. Feels like 60°. High 72°, low 58°.
Monthly outlook for Herndon, VA: average high 64.5°, average low 48.7°. That is 0.2° below the climate normal for October. Precipitation is expected on 4 days (about 2.1 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 14 October (84.3°), the coolest 18 October (33.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 12 October – 21 October | 69.1° | 65.9° | +1.8° |
| 22 October – 31 October | 56.7° | 62.2° | -3.1° |
| 1 November – 10 November | at normal | 59.3° | — |
October records over 66 years
0
Herndon, Tuesday, 13 October
Clear. High 80°, low 53°.
0.01
Herndon, Wednesday, 14 October
Light rain. High 84°, low 65°.
0.19Herndon, Thursday, 15 October
Rain. High 69°, low 61°.
0.11Herndon, Friday, 16 October
Light rain. High 78°, low 57°.
0Herndon, Saturday, 17 October
Clear. High 54°, low 38°.
0Herndon, Sunday, 18 October
Clear. High 54°, low 33°.
0Herndon, Monday, 19 October
Clear. High 64°, low 38°.
0Herndon, Tuesday, 20 October
Overcast. High 66°, low 46°.
0Herndon, Wednesday, 21 October
Clear. High 69°, low 48°.
0Herndon, Thursday, 22 October
Overcast. High 67°, low 51°.
1.73Herndon, Friday, 23 October
Heavy rain. High 62°, low 49°.
0.01Herndon, Saturday, 24 October
Light rain. High 51°, low 45°.
0Herndon, Sunday, 25 October
Clear. High 54°, low 42°.
0.02Herndon, Monday, 26 October
Light rain. High 52°, low 46°.
0Herndon, Tuesday, 27 October
Overcast. High 54°, low 48°.
0.09
Herndon, Wednesday, 28 October
Climate normal for this date — 60-year average.
0.22Herndon, Thursday, 29 October
Climate normal for this date — 60-year average.
0.09Herndon, Friday, 30 October
Climate normal for this date — 60-year average.
0.06
Herndon, Saturday, 31 October
Climate normal for this date — 60-year average.
0.08Herndon, 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.
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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