Weather in Castle Rock, CO
Castle Rock, Saturday, 8 August, 21:37
Overcast. Feels like 77°. High 94°, low 64°.
Monthly outlook for Castle Rock, CO: average high 85.7°, average low 61.3°. That is 1.7° above the climate normal for August. Precipitation is expected on 8 days (about 4.5 inches), against a normal of 5 days and 0.9 inches. The warmest day looks like 11 August (95.3°), the coolest 16 August (57.8°).
Ten-day blocks vs climate normal
| Period | Forecast high | Normal | Difference |
|---|---|---|---|
| 8 August – 17 August | 87.1° | 82.7° | +2.5° |
| 18 August – 27 August | 83.5° | 82.3° | +0.7° |
| 28 August – 6 September | at normal | 81.2° | — |
August records over 66 years
Climate normals and records are computed from the nearest reference point — Cottonwood (13 mi).
0.01
Castle Rock, Sunday, 9 August
Light rain. High 93°, low 68°.
0.02Castle Rock, Monday, 10 August
Light rain. High 94°, low 64°.
0Castle Rock, Tuesday, 11 August
Overcast. High 95°, low 61°.
0.35Castle Rock, Wednesday, 12 August
Rain. High 90°, low 62°.
1.57Castle Rock, Thursday, 13 August
Heavy rain. High 83°, low 60°.
0.34Castle Rock, Friday, 14 August
Rain. High 79°, low 61°.
1.13Castle Rock, Saturday, 15 August
Heavy rain. High 80°, low 60°.
0.1Castle Rock, Sunday, 16 August
Light rain. High 78°, low 58°.
0.01Castle Rock, Monday, 17 August
Light rain. High 86°, low 60°.
0
Castle Rock, Tuesday, 18 August
Clear. High 90°, low 61°.
0.75Castle Rock, Wednesday, 19 August
Heavy rain. High 80°, low 61°.
0.16Castle Rock, Thursday, 20 August
Light rain. High 78°, low 61°.
0.11Castle Rock, Friday, 21 August
Light rain. High 82°, low 59°.
0
Castle Rock, Saturday, 22 August
Partly cloudy. High 86°, low 59°.
0Castle Rock, Sunday, 23 August
Overcast. High 86°, low 61°.
0.07Castle Rock, Monday, 24 August
Climate normal for this date — 60-year average.
0.05Castle Rock, Tuesday, 25 August
Climate normal for this date — 60-year average.
0.07Castle Rock, Wednesday, 26 August
Climate normal for this date — 60-year average.
0.04Castle Rock, Thursday, 27 August
Climate normal for this date — 60-year average.
0.04Castle Rock, Friday, 28 August
Climate normal for this date — 60-year average.
0.04Castle Rock, Saturday, 29 August
Climate normal for this date — 60-year average.
0.04
Castle Rock, Sunday, 30 August
Climate normal for this date — 60-year average.
0.03Castle Rock, Monday, 31 August
Climate normal for this date — 60-year average.
0.05Castle Rock, Tuesday, 1 September
Climate normal for this date — 60-year average.
0.03Castle Rock, Wednesday, 2 September
Climate normal for this date — 60-year average.
0.03Castle Rock, Thursday, 3 September
Climate normal for this date — 60-year average.
0.03Castle Rock, Friday, 4 September
Climate normal for this date — 60-year average.
0.03Castle Rock, Saturday, 5 September
Climate normal for this date — 60-year average.
0.02Castle Rock, Sunday, 6 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 Castle Rock, CO 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 Castle Rock, CO 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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