Fallbrook weather in August

In August, Fallbrook sees average daytime highs of 86°F and overnight lows near 67°F, with 0.1 in of rain across 0.6 wet days and about 13.2 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 86°F through the month. The sky is clear or mostly clear about 89% of the time in August, and the air most often feels humid.

Daylight stretches from about 13 h 42 min at the start of August to 12 h 48 min by month's end. Set against the rest of the year, August is Fallbrook's 1st-clearest and 11th-windiest month. For the whole year in context, see Fallbrook's year-round climate.

Daytime high
86°
1st warmest
Overnight low
67°
12th coldest
Rainfall
0.1 in
0.6 wet days
Daylight
13 h 12 min
5:16 AM – 6:31 PM
Cloud cover
14%
1st clearest
Wind
4 mph
11th windiest
Solar energy
7.22 kWh/m²
Travel score
6.6
out of 10

Fallbrook is census-designated place in San Diego County, California, United States.

Density
671/km²
people per km²
Founded
1869

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in August

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 86°F through the month.

A typical August day in Fallbrook reaches about 86°F in the afternoon and slips back to 67°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 79°F and 93°F. Set against its neighbours, August runs about 2°F warmer than July and about 3°F warmer than September.

60°70°80°90°151015202531
Avg high (°F)Avg low (°F)
18667
28667
38667
48667
58667
68667
78667
88667
98667
108667
118667
128667
138667
148667
158667
168667
178667
188767
198767
208767
218767
228767
238767
248767
258767
268767
278767
288767
298767
308767
318767

Fallbrook weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan64° / 45°2.75.8106.5
Feb64° / 46°3.4710.86.2
Mar66° / 49°2.0611.76.9
Apr69° / 52°1.03.512.87.8
May73° / 56°0.42.113.78.5
Jun79° / 60°0.10.614.28.9
Jul85° / 65°0.20.8147.2
Aug86° / 67°0.10.613.26.6
Sep84° / 64°0.2112.27.5
Oct77° / 58°0.72.711.28.6
Nov70° / 50°1.03.110.38.0
Dec63° / 45°2.04.99.86.6

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 89% of the time in August, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 6% of August, with mostly cloudy or overcast conditions the remaining 5%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1928
2937
3937
4946
5946
6955
7955
8955
9964
10964
11964
12973
13973
14973
15973
16973
17973
18973
19964
20964
21964
22964
23964
24955
25955
26955
27955
28955
29955
30955
31946

Chance of precipitation in August

Any precipitation

Fallbrook gets around 0.1 in of rain over 0.6 wet days in August. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 2% and peaks near 3% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
13
23
32
42
52
62
72
82
92
102
112
122
132
142
152
162
172
182
192
202
212
222
232
242
252
262
272
282
292
302
313

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

Most of August feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, August lands in the humid band about 40% of days. Sticky, muggy-or-worse air turns up on roughly 13% of them.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
15354614
25364514
36364414
46364315
56374215
66374215
77384115
87384015
97383915
107393915
117403815
127403815
137403815
147413814
157413814
167413814
177413913
187414013
197404012
207404112
217404112
227404111
238404111
248404111
258404011
269394012
279394012
2810384013
2910383913
3010373914
3111373814

Wind in August

Winds average 4 mph in August.

Across August, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in August

DaylightNight

Daylight runs from about 13 h 42 min at the start of August to 12 h 48 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 54 minutes over August. Sunrise moves from 5:05 AM to 5:26 AM, and sunset from 6:45 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:056:45
213.65:066:44
313.65:066:44
413.65:076:43
513.65:086:42
613.55:096:41
713.55:096:40
813.55:106:39
913.55:116:38
1013.45:116:37
1113.45:126:36
1213.45:136:35
1313.35:146:34
1413.35:146:33
1513.35:156:32
1613.25:166:31
1713.25:166:29
1813.25:176:28
1913.25:186:27
2013.15:196:26
2113.15:196:25
2213.15:206:23
2313.05:216:22
2413.05:216:21
2513.05:226:20
2612.95:236:18
2712.95:236:17
2812.95:246:16
2912.85:256:15
3012.85:266:13
3112.85:266:12

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 7.22 kWh/m².

For context, solar energy here swings from a low near 3.06 kWh/m² to a high of 8.04 kWh/m² in June across the year — August's 7.22 kWh/m² falls in the middle.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.5Intense
37.5Intense
47.4Intense
57.4Intense
67.4Intense
77.4Intense
87.4Intense
97.4Intense
107.4Intense
117.3Intense
127.3Intense
137.3Intense
147.3Intense
157.3Intense
167.2Intense
177.2Intense
187.2Intense
197.2Intense
207.1Intense
217.1Intense
227.1Intense
237.0Intense
247.0Intense
257.0Intense
266.9Intense
276.9Intense
286.8Intense
296.8Intense
306.8Intense
316.7Intense
Planning a trip in August

Is August a good time to visit Fallbrook?

Our two travel scores rate August for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).

6.6
Sightseeing
9th-best month of the year
9.1
Beach & pool
2nd-best month of the year

August is a reasonable time to visit Fallbrook for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Fallbrook in August

From August's temperature range, rain chance, sun and wind — what's worth putting in the bag.

In August, Fallbrook sees daytime highs around 86°F and nights near 67°F. Pack light clothes and sun protection.

light clothessun protection

Sea temperature near Fallbrook in August

The nearest coast averages about 71°F in August — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 19 mi away) is warmest in August at about 71°F and coldest in January near 59°F.

It's comfortable for a long swim from Jul 5 to Oct 7 — about 3.1 months when the water holds above 68°F.

60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°F)Comfort
Jan59Cool
Feb59Cool
Mar60Cool
Apr61Cool
May64Cool
Jun66Cool
Jul69Refreshing
Aug71Refreshing
Sep70Refreshing
Oct67Cool
Nov64Cool
Dec61Cool

UV index in Fallbrook in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks around 10 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Fallbrook peaks around July 11 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 — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJul 11UV 11Dec 17UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Fallbrook in August

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where August falls, not just the annual average.

Air quality in Fallbrook is worst in September — around 40 µg/m³ PM2.5 (poor), about 5.4× the cleanest month (December, 7 µg/m³).

Modeled monthly averages (CAMS reanalysis, 2015–2024).

010203040JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateModerateGoodSep 1437 µg/m³Dec 207 µg/m³
PM2.5 (µg/m³)Level
Jan8Good
Feb9Good
Mar11Good
Apr10Good
May8Good
Jun19Moderate
Jul12Moderate
Aug20Moderate
Sep40Poor
Oct10Good
Nov8Good
Dec7Good
Location & terrain

Where is Fallbrook?

Fallbrook sits at 33.4°N, 117.3°W, 682 ft above sea level, in United States. The nearest listed city is Temecula, 9.9 mi away.

Topography around Fallbrook

How much the land rises and falls, and what covers it, within 2, 10 and 50 miles of Fallbrook.

Within 2 miles, the terrain around Fallbrook has only modest variations in elevation — a maximum elevation change of 748 ft around an average of 682 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,123 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,722 ft.

The land around Fallbrook is covered by grassland (33%), trees (32%) and artificial surfaces (27%) within 2 miles, trees (42%) and grassland (31%) within 10 miles, and shrubs (25%) and water (22%) within 50 miles.

2 miles
748 ft
10 miles
3,123 ft
50 miles
10,722 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Temecula 9.9 mi · Vista 12 mi · Murrieta 12 mi · Oceanside 14 mi · Wildomar 16 mi · Carlsbad 16 mi · San Marcos 17 mi · Escondido 20 mi

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
Protestant 47%unaffiliated 23%Roman Catholic 21%Jewish 2%

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 Fallbrook (33.3764°, -117.2511°, elevation 682 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).