Weather in Herndon, VA
Herndon, Sunday, 11 October, 11:07
Rain. Feels like 61°. High 71°, low 60°.
Monthly outlook for Herndon, VA: average high 66.1°, average low 47.8°. That is 0.6° above the climate normal for October. Precipitation is expected on 4 days (about 2.2 inches), against a normal of 4 days and 1.7 inches. The warmest day looks like 14 October (83.1°), the coolest 18 October (33.4°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 11 October – 20 October | 68.3° | 66.1° | +1.2° |
| 21 October – 30 October | 62.4° | 62.5° | -0.1° |
| 31 October – 9 November | at normal | 59.6° | — |
October records over 66 years
0.76Herndon, Monday, 12 October
Heavy rain. High 78°, low 60°.
0
Herndon, Tuesday, 13 October
Clear. High 79°, low 54°.
0.01Herndon, Wednesday, 14 October
Light rain. High 83°, low 63°.
0Herndon, Thursday, 15 October
Clear. High 69°, low 63°.
0.07Herndon, Friday, 16 October
Light rain. High 82°, low 57°.
0Herndon, Saturday, 17 October
Clear. High 53°, low 37°.
0Herndon, Sunday, 18 October
Clear. High 48°, low 33°.
0
Herndon, Monday, 19 October
Overcast. High 56°, low 34°.
0
Herndon, Tuesday, 20 October
Mostly clear. High 63°, low 39°.
0Herndon, Wednesday, 21 October
Clear. High 64°, low 44°.
0Herndon, Thursday, 22 October
Overcast. High 62°, low 46°.
0Herndon, Friday, 23 October
Clear. High 62°, low 43°.
0Herndon, Saturday, 24 October
Overcast. High 61°, low 44°.
0Herndon, Sunday, 25 October
Clear. High 61°, low 46°.
0.23Herndon, Monday, 26 October
Rain. High 64°, low 44°.
0.16
Herndon, Tuesday, 27 October
Climate normal for this date — 60-year average.
0.09Herndon, 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.
0.06Herndon, 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.
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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