Casa de Oro-Mount Helix in Summer
In summer (June, July and August), Casa de Oro-Mount Helix sees average daytime highs around 78°F and overnight lows near 63°F, with 0.2 in of rain over about 2 wet days across the season. It is the warmest season of the year and the driest season of the year.
Over the season highs climb from about 72°F in early June to 82°F by late August. The sky is clear or mostly clear about 84% of the time across summer, and the air most often feels comfortable.
Summer is Casa de Oro-Mount Helix's best season of the year to visit on our travel score. For the whole year in context, see Casa de Oro-Mount Helix's year-round climate.
- Avg daytime high
- 78°F
- warmest season of the year
- Avg overnight low
- 63°F
- Rainfall
- 0.2 in
- 2 wet days
- Avg wind
- 5 mph
- Travel score
- 8.9
- best season of the year
- Months
- Jun · Jul · Aug
Temperature in Casa de Oro-Mount Helix in Summer
Over the season highs climb from about 72°F in early June to 82°F by late August.
A typical summer day in Casa de Oro-Mount Helix reaches about 78°F and drops to 63°F overnight. The warmest of the three months is August, the coolest June.
Casa de Oro-Mount Helix 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 | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 64° / 48° | 2.3 | 5.6 | 10.1 | 6.8 |
| Feb | 64° / 48° | 2.9 | 7 | 10.8 | 6.3 |
| Mar | 65° / 50° | 1.9 | 5.8 | 11.8 | 6.8 |
| Apr | 68° / 53° | 0.9 | 3.9 | 12.8 | 7.6 |
| May | 70° / 56° | 0.4 | 2 | 13.7 | 8.2 |
| Jun | 74° / 60° | 0.1 | 0.6 | 14.1 | 9.2 |
| Jul | 79° / 64° | 0.1 | 0.7 | 13.9 | 8.9 |
| Aug | 81° / 65° | 0.1 | 0.5 | 13.2 | 8.7 |
| Sep | 80° / 64° | 0.2 | 0.9 | 12.2 | 8.8 |
| Oct | 76° / 59° | 0.6 | 2.5 | 11.2 | 8.7 |
| Nov | 70° / 53° | 0.9 | 3.3 | 10.3 | 7.9 |
| Dec | 64° / 48° | 1.9 | 5.2 | 9.9 | 6.8 |
Cloud cover in Summer
The sky is clear or mostly clear about 84% of the time across summer.
Chance of precipitation in Summer
Casa de Oro-Mount Helix gets around 0.2 in of rain over 2 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels comfortable — 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 hours in early June to 12 h 42 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 7.7 kWh/m².
Is summer a good time to visit Casa de Oro-Mount Helix?
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 one of the better times to visit Casa de Oro-Mount Helix for general sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Casa de Oro-Mount Helix in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Casa de Oro-Mount Helix sees daytime highs around 78°F and nights near 63°F. Pack light clothes and sun protection.
Sea temperature near Casa de Oro-Mount Helix in Summer
The nearest coast averages about 68°F across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 13 mi away) is warmest in August at about 70°F and coldest in February near 59°F.
It's comfortable for a long swim from Jul 13 to Sep 28 — about 2.6 months when the water holds above 68°F.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sea temperature (°F) | 60 | 59 | 60 | 61 | 63 | 65 | 68 | 70 | 69 | 67 | 64 | 61 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 60 | Cool |
| Feb | 59 | Cool |
| Mar | 60 | Cool |
| Apr | 61 | Cool |
| May | 63 | Cool |
| Jun | 65 | Cool |
| Jul | 68 | Refreshing |
| Aug | 70 | Refreshing |
| Sep | 69 | Refreshing |
| Oct | 67 | Cool |
| Nov | 64 | Cool |
| Dec | 61 | Cool |
UV index in Casa de Oro-Mount Helix 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 Casa de Oro-Mount Helix peaks around June 22 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 8 | 8 | 11 | 11 | 11 | 9 | 6 | 4 | 3 |
| Level | Moderate | Moderate | High | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | High |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 11 | Extreme |
| Aug | 11 | Extreme |
| Sep | 9 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Casa de Oro-Mount Helix in Summer
Average fine-particle pollution (PM2.5) through the year — so you can see where summer falls, not just the annual average.
Air quality in Casa de Oro-Mount Helix is worst in September — around 26 µg/m³ PM2.5 (moderate), about 3.4× the cleanest month (May, 8 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 12 | 12 | 12 | 11 | 8 | 11 | 11 | 15 | 26 | 14 | 12 | 16 |
| Level | Good | Moderate | Moderate | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 12 | Good |
| Feb | 12 | Moderate |
| Mar | 12 | Moderate |
| Apr | 11 | Good |
| May | 8 | Good |
| Jun | 11 | Good |
| Jul | 11 | Good |
| Aug | 15 | Moderate |
| Sep | 26 | Moderate |
| Oct | 14 | Moderate |
| Nov | 12 | Moderate |
| Dec | 16 | Moderate |
Where is Casa de Oro-Mount Helix?
Casa de Oro-Mount Helix sits at 32.8°N, 117.0°W, 840 ft above sea level, in United States. The nearest listed city is El Cajon, 1.9 mi away.
Topography around Casa de Oro-Mount Helix
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Casa de Oro-Mount Helix.
Within 2 miles, the terrain around Casa de Oro-Mount Helix has significant variations in elevation — a maximum elevation change of 932 ft around an average of 643 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,762 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,430 ft.
The land around Casa de Oro-Mount Helix is covered by artificial surfaces (59%) and trees (31%) within 2 miles, artificial surfaces (40%) and shrubs (26%) within 10 miles, and shrubs (27%) and water (27%) 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 Casa de Oro-Mount Helix (32.764°, -116.9688°, elevation 840 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.