Temperature
Cool by day, freezing at night.
Castle Rock is usually most comfortable in September and October. Typical daytime highs range from 42–84°F across the year. Most months see little rain.

Cool by day, freezing at night.
Some precipitation is expected this month.
Plenty of sun this month.
Humidity is rarely noticeable in the cool air.
In November, afternoons feel about 38° and nights feel near 19°.
Mostly clear skies this month.
Calm winds are typical in November.
November late afternoons are around 44°F, easing to about 35°F in early evening.
| Month | High°F | Low°F | Rainin | Wet days | Sunh | Humidity% |
|---|---|---|---|---|---|---|
| Jan | 42 | 15 | 0.6 | 4 | 8.7 | 61 |
| Feb | 45 | 18 | 0.7 | 5 | 9.5 | 59 |
| Mar | 53 | 25 | 1.7 | 8 | 10.7 | 55 |
| Apr | 59 | 31 | 2.6 | 9 | 11.3 | 56 |
| May | 68 | 41 | 3.0 | 13 | 12.3 | 59 |
| Jun | 80 | 51 | 2.1 | 11 | 13.0 | 53 |
| Jul | 84 | 56 | 2.5 | 11 | 13.2 | 55 |
| Aug | 82 | 55 | 2.0 | 11 | 12.5 | 57 |
| Sep | 76 | 47 | 1.3 | 7 | 11.2 | 53 |
| Oct | 64 | 35 | 1.4 | 6 | 10.0 | 54 |
| Nov | 51 | 24 | 1.0 | 5 | 8.9 | 56 |
| Dec | 42 | 15 | 0.7 | 4 | 8.3 | 60 |
Similar climates
Want a side-by-side climate view? Compare Castle Rock with New York City.
Typical monthly values are based on long-term climate records. Useful for planning, not a forecast. Check the weather before you travel.
Sunshine: source type is not yet identified at metric level.
Local microclimates can vary by beach, neighborhood, trail, or elevation.
Last updated: Aug 27, 2026
Data & methodology