Castle Rock in Summer
In summer (June, July and August), Castle Rock sees average daytime highs around 79°F and overnight lows near 51°F, with 6.6 in of rain over about 31 wet days across the season. It is the warmest season of the year and the 2nd-wettest season.
Over the season highs climb from about 72°F in early June to 78°F by late August. The sky is clear or mostly clear about 36% of the time across summer, and the air most often feels dry.
Summer is Castle Rock's best season of the year to visit on our travel score. For the whole year in context, see Castle Rock's year-round climate.
- Avg daytime high
- 79°F
- warmest season of the year
- Avg overnight low
- 51°F
- Rainfall
- 6.6 in
- 31 wet days
- Avg wind
- 5 mph
- Travel score
- 6.7
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Castle Rock in Summer
Over the season highs climb from about 72°F in early June to 78°F by late August.
A typical summer day in Castle Rock reaches about 79°F and drops to 51°F overnight. The warmest of the three months is July, the coolest June.
How summer really feels in Castle Rock
Once humidity and wind are folded in, summer brings about 0 days that feel above 90°F and 0 that feel at or below 32°F.
summer sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Castle Rock weather by month
How the three summer months (June, July and August) compare with the rest of the year — the season's months are highlighted.
| Month | High / Low (°F) | Rainfall (inches) | Wet days | Snow days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|---|
| Jan | 39° / 12° | 0.6 | 4.2 | 4.7 | 9.5 | 0.0 |
| Feb | 42° / 15° | 0.7 | 5 | 5.4 | 10.5 | 0.3 |
| Mar | 49° / 22° | 1.7 | 6.9 | 5.9 | 11.7 | 2.2 |
| Apr | 55° / 28° | 2.6 | 9.7 | 6.1 | 13 | 3.5 |
| May | 65° / 39° | 3.0 | 12.3 | 1.7 | 14.1 | 5.5 |
| Jun | 76° / 48° | 2.1 | 10.2 | 0.1 | 14.7 | 6.8 |
| Jul | 81° / 54° | 2.5 | 10.9 | 0 | 14.5 | 6.5 |
| Aug | 79° / 52° | 2.0 | 10.1 | 0 | 13.5 | 6.9 |
| Sep | 72° / 45° | 1.3 | 6.4 | 0.5 | 12.3 | 7.6 |
| Oct | 60° / 32° | 1.4 | 5.5 | 2.4 | 11 | 5.7 |
| Nov | 48° / 21° | 1.0 | 4.9 | 4.9 | 9.8 | 2.0 |
| Dec | 39° / 12° | 0.7 | 3.9 | 4.4 | 9.3 | 0.0 |
Cloud cover in Summer
The sky is clear or mostly clear about 36% of the time across summer.
Chance of precipitation in Summer
Castle Rock gets around 6.6 in of rain over 31 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 5 mph across summer.
Sunrise & sunset in Summer
Daylight runs from about 14 h 36 min in early June to 12 h 54 min by late August. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 7.0 kWh/m².
Is summer a good time to visit Castle Rock?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Castle Rock for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Castle Rock in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Castle Rock sees daytime highs around 79°F and nights near 51°F. Pack light clothes and sun protection. Worth having: rain gear. About 31 days see rain.
UV index in Castle Rock in Summer
Clear-sky midday UV across summer averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Castle Rock peaks around July 15 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 22 at about 2 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 10 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 3 | 4 | 7 | 7 | 8 | 11 | 11 | 10 | 8 | 6 | 4 | 2 |
| Level | Moderate | Moderate | Very high | High | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 3 | Moderate |
| Feb | 4 | Moderate |
| Mar | 7 | Very high |
| Apr | 7 | High |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 2 | Moderate |
Where is Castle Rock?
Castle Rock sits at 39.4°N, 104.9°W, 6,224 ft above sea level, in United States. The nearest listed city is Parker, 11 mi away.
Topography around Castle Rock
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Castle Rock.
Within 2 miles, the terrain around Castle Rock has only modest variations in elevation — a maximum elevation change of 646 ft around an average of 6,368 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,028 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,268 ft.
The land around Castle Rock is covered by grassland (52%) and artificial surfaces (28%) within 2 miles, grassland (74%) within 10 miles, and grassland (55%) and trees (29%) within 50 miles.
United States travel facts
- Power plugs
- Type A / B
- 120 V · 60 Hz
- Prices
- ≈ 100% of US
- price level, 2025
- GDP per capita
- $90,027
- 2025
- Happiness
- 6.8 / 10
- World Happiness, 2025
- Safe drinking water
- 98%
- of population, 2024
- Homicide rate
- 5.8
- per 100k, 2023
- Road deaths
- 12.7
- per 100k/yr, 2019
- Income group
- High
- World Bank
- Religion
Sources: World Bank, US State Department, World Happiness Report, WHO/UNICEF, EF EPI, CIA World Factbook.
Data sources
Temperature, precipitation, cloud, humidity, wind and solar figures are a 1991–2020 climatology for Castle Rock (39.3722°, -104.8561°, elevation 6,224 ft), computed from hourly ERA5 reanalysis — contains modified Copernicus Climate Change Service information. Sun figures are astronomical calculations, not observations. City data © GeoNames, CC BY 4.0. Map outlines from Natural Earth (public domain); interactive map © Google.