Weather in Great Falls, MD
Great Falls, Sunday, 9 August, 00:57
Overcast. Feels like 76°. High 89°, low 73°.
Monthly outlook for Great Falls, MD: average high 84.2°, average low 67.7°. That is 0.4° above the climate normal for August. Precipitation is expected on 6 days (about 0.8 inches), against a normal of 6 days and 2.1 inches. The warmest day looks like 10 August (93.5°), the coolest 22 August (60°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 9 August – 18 August | 84.2° | 84.3° | -0° |
| 19 August – 28 August | 84.2° | 82.9° | +0.7° |
| 29 August – 7 September | at normal | 81.8° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Tysons (6 mi).
0.09
Great Falls, Monday, 10 August
Rain. High 94°, low 74°.
0.25Great Falls, Tuesday, 11 August
Rain. High 91°, low 69°.
0.09Great Falls, Wednesday, 12 August
Light rain. High 93°, low 72°.
0.03Great Falls, Thursday, 13 August
Light rain. High 85°, low 71°.
0Great Falls, Friday, 14 August
Overcast. High 71°, low 62°.
0
Great Falls, Saturday, 15 August
Clear. High 83°, low 61°.
0
Great Falls, Sunday, 16 August
Mostly clear. High 86°, low 63°.
0.04Great Falls, Monday, 17 August
Light rain. High 76°, low 68°.
0.08Great Falls, Tuesday, 18 August
Light rain. High 76°, low 67°.
0.01Great Falls, Wednesday, 19 August
Light rain. High 83°, low 69°.
0.16Great Falls, Thursday, 20 August
Light rain. High 82°, low 69°.
0Great Falls, Friday, 21 August
Clear. High 82°, low 62°.
0Great Falls, Saturday, 22 August
Mostly clear. High 84°, low 60°.
0.09Great Falls, Sunday, 23 August
Light rain. High 82°, low 70°.
0Great Falls, Monday, 24 August
Clear. High 93°, low 71°.
0.07
Great Falls, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.05Great Falls, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.15
Great Falls, Thursday, 27 August
Climate normal for this date — 60-year average.
0.17Great Falls, Friday, 28 August
Climate normal for this date — 60-year average.
0.13Great Falls, Saturday, 29 August
Climate normal for this date — 60-year average.
0.06Great Falls, Sunday, 30 August
Climate normal for this date — 60-year average.
0.07Great Falls, Monday, 31 August
Climate normal for this date — 60-year average.
0.12Great Falls, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.11Great Falls, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.1Great Falls, Thursday, 3 September
Climate normal for this date — 60-year average.
0.1Great Falls, Friday, 4 September
Climate normal for this date — 60-year average.
0.15Great Falls, Saturday, 5 September
Climate normal for this date — 60-year average.
0.26Great Falls, Sunday, 6 September
Climate normal for this date — 60-year average.
0.1Great Falls, Monday, 7 September
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 Great Falls, MD 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 Great Falls, MD 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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