Mission Viejo in Fall
In fall (September, October and November), Mission Viejo sees average daytime highs around 71°F and overnight lows near 61°F, with 1.5 in of rain over about 5 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 75°F in early September to 65°F by late November. The sky is clear or mostly clear about 72% of the time across fall, and the air most often feels comfortable.
Fall is Mission Viejo's 2nd-best season to visit on our travel score. For the whole year in context, see Mission Viejo's year-round climate.
- Avg daytime high
- 71°F
- 2nd-warmest season
- Avg overnight low
- 61°F
- Rainfall
- 1.5 in
- 5 wet days
- Avg wind
- 5 mph
- Travel score
- 8.5
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Mission Viejo in Fall
Over the season highs ease from about 75°F in early September to 65°F by late November.
A typical fall day in Mission Viejo reaches about 71°F and drops to 61°F overnight. The warmest of the three months is September, the coolest November.
Mission Viejo weather by month
How the three fall months (September, October and November) 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 | 62° / 51° | 2.6 | 5.5 | 10 | 6.2 |
| Feb | 62° / 52° | 3.1 | 6.3 | 10.8 | 5.9 |
| Mar | 63° / 53° | 1.8 | 5.7 | 11.7 | 6.3 |
| Apr | 64° / 55° | 0.8 | 2.9 | 12.8 | 7.2 |
| May | 66° / 58° | 0.3 | 1.7 | 13.7 | 7.7 |
| Jun | 69° / 61° | 0.1 | 0.4 | 14.2 | 8.5 |
| Jul | 73° / 64° | 0.1 | 0.4 | 14 | 9.2 |
| Aug | 75° / 66° | 0.0 | 0.2 | 13.2 | 9.6 |
| Sep | 74° / 65° | 0.1 | 0.6 | 12.2 | 9.3 |
| Oct | 71° / 61° | 0.6 | 2 | 11.2 | 8.5 |
| Nov | 67° / 56° | 0.8 | 2.8 | 10.3 | 7.7 |
| Dec | 62° / 51° | 1.9 | 4.8 | 9.8 | 6.4 |
Cloud cover in Fall
The sky is clear or mostly clear about 72% of the time across fall.
Chance of precipitation in Fall
Mission Viejo gets around 1.5 in of rain over 5 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 5 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 42 min in early September to 9 h 54 min by late November. The lit band spans sunrise to sunset each day.
Solar energy in Fall
Average shortwave solar energy reaching the ground each day across fall, about 4.8 kWh/m².
Is fall a good time to visit Mission Viejo?
Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
fall is one of the better times to visit Mission Viejo for general sightseeing.
What to pack for Mission Viejo in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Mission Viejo sees daytime highs around 71°F and nights near 61°F. Pack sun protection. Worth having: light clothes. About 5 days see rain.
Sea temperature near Mission Viejo in Fall
The nearest coast averages about 66°F across fall — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 12 mi away) is warmest in August at about 69°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) | 59 | 59 | 59 | 60 | 63 | 65 | 68 | 69 | 69 | 67 | 64 | 60 |
| Comfort | Cool | Cool | Cool | Cool | Cool | Cool | Refreshing | Refreshing | Refreshing | Cool | Cool | Cool |
| Sea temperature (°F) | Comfort | |
|---|---|---|
| Jan | 59 | Cool |
| Feb | 59 | Cool |
| Mar | 59 | Cool |
| Apr | 60 | Cool |
| May | 63 | Cool |
| Jun | 65 | Cool |
| Jul | 68 | Refreshing |
| Aug | 69 | Refreshing |
| Sep | 69 | Refreshing |
| Oct | 67 | Cool |
| Nov | 64 | Cool |
| Dec | 60 | Cool |
UV index in Mission Viejo in Fall
Clear-sky midday UV across fall averages around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Mission Viejo peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 3 (moderate).
The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| UV index (midday) | 4 | 5 | 5 | 8 | 8 | 11 | 10 | 10 | 8 | 6 | 3 | 3 |
| Level | Moderate | Moderate | Moderate | Very high | Very high | Extreme | Extreme | Extreme | Very high | High | Moderate | Moderate |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 4 | Moderate |
| Feb | 5 | Moderate |
| Mar | 5 | Moderate |
| Apr | 8 | Very high |
| May | 8 | Very high |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 3 | Moderate |
| Dec | 3 | Moderate |
Air quality in Mission Viejo in Fall
Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.
Air quality in Mission Viejo is worst in September — around 49 µg/m³ PM2.5 (poor), about 4.0× the cleanest month (May, 12 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) | 18 | 19 | 19 | 17 | 12 | 17 | 19 | 32 | 49 | 21 | 21 | 18 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Poor | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 18 | Moderate |
| Feb | 19 | Moderate |
| Mar | 19 | Moderate |
| Apr | 17 | Moderate |
| May | 12 | Moderate |
| Jun | 17 | Moderate |
| Jul | 19 | Moderate |
| Aug | 32 | Moderate |
| Sep | 49 | Poor |
| Oct | 21 | Moderate |
| Nov | 21 | Moderate |
| Dec | 18 | Moderate |
Where is Mission Viejo?
Mission Viejo sits at 33.6°N, 117.7°W, 397 ft above sea level, in United States. The nearest listed city is Laguna Hills, 2.5 mi away.
Topography around Mission Viejo
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Mission Viejo.
Within 2 miles, the terrain around Mission Viejo has only modest variations in elevation — a maximum elevation change of 561 ft around an average of 492 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,590 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,013 ft.
The land around Mission Viejo is covered by artificial surfaces (67%) and trees (25%) within 2 miles, trees (30%) and artificial surfaces (30%) within 10 miles, and water (31%) and artificial surfaces (26%) 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 Mission Viejo (33.6°, -117.672°, elevation 397 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.