Imperial Beach in Fall
In fall (September, October and November), Imperial Beach sees average daytime highs around 70°F and overnight lows near 61°F, with 1.8 in of rain over about 7 wet days across the season. It is the 2nd-warmest season and the 3rd-wettest season.
Over the season highs ease from about 74°F in early September to 64°F by late November. The sky is clear or mostly clear about 70% of the time across fall, and the air most often feels dry.
Fall is Imperial Beach's 2nd-best season to visit on our travel score. For the whole year in context, see Imperial Beach's year-round climate.
- Avg daytime high
- 70°F
- 2nd-warmest season
- Avg overnight low
- 61°F
- Rainfall
- 1.8 in
- 7 wet days
- Avg wind
- 6 mph
- Travel score
- 8.2
- 2nd-best season
- Months
- Sep · Oct · Nov
Temperature in Imperial Beach in Fall
Over the season highs ease from about 74°F in early September to 64°F by late November.
A typical fall day in Imperial Beach reaches about 70°F and drops to 61°F overnight. The warmest of the three months is September, the coolest November.
Imperial Beach 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 | 61° / 52° | 2.5 | 6.1 | 10.1 | 5.8 |
| Feb | 61° / 52° | 3.1 | 7 | 10.8 | 5.4 |
| Mar | 61° / 53° | 2.1 | 5.9 | 11.8 | 5.8 |
| Apr | 63° / 55° | 1.0 | 4.2 | 12.8 | 6.7 |
| May | 65° / 58° | 0.4 | 2.1 | 13.6 | 7.5 |
| Jun | 68° / 60° | 0.1 | 0.4 | 14.1 | 8.3 |
| Jul | 72° / 65° | 0.1 | 0.4 | 13.9 | 8.8 |
| Aug | 74° / 66° | 0.0 | 0.3 | 13.2 | 9.2 |
| Sep | 73° / 65° | 0.2 | 0.8 | 12.2 | 9.0 |
| Oct | 70° / 62° | 0.6 | 2.4 | 11.2 | 8.3 |
| Nov | 66° / 56° | 1.0 | 3.6 | 10.3 | 7.4 |
| Dec | 61° / 52° | 2.0 | 5.7 | 9.9 | 6.0 |
Cloud cover in Fall
The sky is clear or mostly clear about 70% of the time across fall.
Chance of precipitation in Fall
Imperial Beach gets around 1.8 in of rain over 7 wet days across fall. The line is the day-by-day chance of measurable precipitation.
Humidity in Fall
Most of fall feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Fall
Winds average 6 mph across fall.
Sunrise & sunset in Fall
Daylight runs from about 12 h 42 min in early September to 10 hours 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 4.9 kWh/m².
Is fall a good time to visit Imperial Beach?
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 Imperial Beach for general sightseeing.
What to pack for Imperial Beach in Fall
From fall's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In fall, Imperial Beach sees daytime highs around 70°F and nights near 61°F. Pack sun protection. Worth having: light clothes. About 7 days see rain.
Sea temperature near Imperial Beach 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 offshore 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 Imperial Beach 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 Imperial Beach peaks around June 23 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 | 10 | 8 | 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 | 10 | Extreme |
| Sep | 8 | Very high |
| Oct | 6 | High |
| Nov | 4 | Moderate |
| Dec | 3 | Moderate |
Air quality in Imperial Beach 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 Imperial Beach is worst in October — around 33 µg/m³ PM2.5 (moderate), about 5.4× the cleanest month (May, 6 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) | 11 | 11 | 10 | 9 | 6 | 9 | 8 | 9 | 16 | 33 | 13 | 17 |
| Level | Good | Good | Good | Good | Good | Good | Good | Good | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 11 | Good |
| Feb | 11 | Good |
| Mar | 10 | Good |
| Apr | 9 | Good |
| May | 6 | Good |
| Jun | 9 | Good |
| Jul | 8 | Good |
| Aug | 9 | Good |
| Sep | 16 | Moderate |
| Oct | 33 | Moderate |
| Nov | 13 | Moderate |
| Dec | 17 | Moderate |
Where is Imperial Beach?
Imperial Beach sits at 32.6°N, 117.1°W, 20 ft above sea level, in United States. The nearest listed city is Chula Vista, 4.3 mi away.
Topography around Imperial Beach
How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Imperial Beach.
Within 2 miles, the terrain around Imperial Beach has only modest variations in elevation — a maximum elevation change of 105 ft around an average of 16 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,152 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,450 ft.
The land around Imperial Beach is covered by artificial surfaces (36%) and water (35%) within 2 miles, water (43%) and artificial surfaces (35%) within 10 miles, and water (35%) and shrubs (24%) 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 Imperial Beach (32.5839°, -117.1131°, elevation 20 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.