Weather in Herndon, GA
Herndon, Sunday, 18 October, 06:22
Clear. Feels like 44°. High 64°, low 48°.
Monthly outlook for Herndon, GA: average high 76.5°, average low 56.7°. That is 1.7° above the climate normal for October. Precipitation is expected on 2 days (about 0.3 inches), against a normal of 3 days and 1.1 inches. The warmest day looks like 2 November (86.9°), the coolest 19 October (46.1°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 18 October – 27 October | 72° | 73.9° | -1.1° |
| 28 October – 6 November | 83.9° | 71.3° | +7° |
| 7 November – 16 November | at normal | 67.3° | — |
October records over 66 years
Climate normals and records are computed from the nearest reference point — Midville (6 mi).
0
Herndon, Monday, 19 October
Clear. High 67°, low 46°.
0Herndon, Tuesday, 20 October
Clear. High 73°, low 47°.
0Herndon, Wednesday, 21 October
Clear. High 72°, low 50°.
0Herndon, Thursday, 22 October
Clear. High 72°, low 48°.
0Herndon, Friday, 23 October
Clear. High 71°, low 48°.
0Herndon, Saturday, 24 October
Clear. High 74°, low 52°.
0Herndon, Sunday, 25 October
Clear. High 74°, low 52°.
0
Herndon, Monday, 26 October
Overcast. High 76°, low 52°.
0Herndon, Tuesday, 27 October
Overcast. High 77°, low 59°.
0.18
Herndon, Wednesday, 28 October
Rain. High 78°, low 63°.
0.13Herndon, Thursday, 29 October
Light rain. High 83°, low 67°.
0.02Herndon, Friday, 30 October
Light rain. High 84°, low 69°.
0Herndon, Saturday, 31 October
Overcast. High 84°, low 66°.
0Herndon, Sunday, 1 November
Clear. High 87°, low 69°.
0
Herndon, Monday, 2 November
Partly cloudy. High 87°, low 70°.
0.04
Herndon, Tuesday, 3 November
Climate normal for this date — 60-year average.
0.09Herndon, Wednesday, 4 November
Climate normal for this date — 60-year average.
0.07Herndon, Thursday, 5 November
Climate normal for this date — 60-year average.
0.06Herndon, Friday, 6 November
Climate normal for this date — 60-year average.
0.13Herndon, Saturday, 7 November
Climate normal for this date — 60-year average.
0.06Herndon, Sunday, 8 November
Climate normal for this date — 60-year average.
0.1Herndon, Monday, 9 November
Climate normal for this date — 60-year average.
0.08Herndon, Tuesday, 10 November
Climate normal for this date — 60-year average.
0.12Herndon, Wednesday, 11 November
Climate normal for this date — 60-year average.
0.11Herndon, Thursday, 12 November
Climate normal for this date — 60-year average.
0.07Herndon, Friday, 13 November
Climate normal for this date — 60-year average.
0.05Herndon, Saturday, 14 November
Climate normal for this date — 60-year average.
0.09Herndon, Sunday, 15 November
Climate normal for this date — 60-year average.
0.06Herndon, 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, GA 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, GA 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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