Weather in Herndon, VA
Herndon, Monday, 19 October, 05:09
Clear. Feels like 35°. High 67°, low 38°.
Monthly outlook for Herndon, VA: average high 60.9°, average low 40.7°. That is 0.9° below the climate normal for October. Precipitation is expected on 0 days (about 0.0 inches), against a normal of 4 days and 1.8 inches. The warmest day looks like 28 October (71.2°), the coolest 31 October (29.6°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 19 October – 28 October | 64.9° | 63.2° | +0.9° |
| 29 October – 7 November | 54.2° | 60.2° | -3.3° |
| 8 November – 17 November | at normal | 55.2° | — |
October records over 66 years
0
Herndon, Tuesday, 20 October
Clear. High 70°, low 43°.
0Herndon, Wednesday, 21 October
Clear. High 62°, low 44°.
0Herndon, Thursday, 22 October
Clear. High 65°, low 44°.
0
Herndon, Friday, 23 October
Overcast. High 57°, low 43°.
0Herndon, Saturday, 24 October
Clear. High 55°, low 38°.
0Herndon, Sunday, 25 October
Clear. High 62°, low 44°.
0Herndon, Monday, 26 October
Overcast. High 68°, low 46°.
0Herndon, Tuesday, 27 October
Overcast. High 71°, low 52°.
0Herndon, Wednesday, 28 October
Overcast. High 71°, low 48°.
0Herndon, Thursday, 29 October
Overcast. High 48°, low 37°.
0Herndon, Friday, 30 October
Clear. High 49°, low 31°.
0Herndon, Saturday, 31 October
Clear. High 50°, low 30°.
0Herndon, Sunday, 1 November
Overcast. High 56°, low 33°.
0Herndon, Monday, 2 November
Clear. High 61°, low 37°.
0Herndon, Tuesday, 3 November
Overcast. High 61°, low 43°.
0.11
Herndon, 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.
0.07
Herndon, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Herndon, Sunday, 15 November
Climate normal for this date — 60-year average.
0.12Herndon, Monday, 16 November
Climate normal for this date — 60-year average.
0.08Herndon, 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, 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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