San Jacinto weather in August

In August, San Jacinto sees average daytime highs of 89°F and overnight lows near 67°F, with 0.1 in of rain across 1 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 11th-wettest month of the year here.

Day-to-day highs hold fairly steady near 89°F through the month. The sky is clear or mostly clear about 88% of the time in August, and the air most often feels dry.

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 San Jacinto's 1st-clearest and 11th-windiest month. For the whole year in context, see San Jacinto's year-round climate.

Daytime high
89°
1st warmest
Overnight low
67°
12th coldest
Rainfall
0.1 in
1 wet days
Daylight
13 h 18 min
5:14 AM – 6:30 PM
Cloud cover
14%
1st clearest
Wind
3 mph
11th windiest
Solar energy
7.23 kWh/m²
Travel score
5.5
out of 10

San Jacinto is city in Riverside County, California, United States.

Density
694/km²
people per km²
Founded
1888

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 89°F through the month.

A typical August day in San Jacinto reaches about 89°F in the afternoon and slips back to 67°F overnight — a 22°F spread between the day's warmth and the night's chill. On most days the high lands between 83°F and 96°F. Set against its neighbours, August runs on par with July and about 4°F warmer than September.

60°70°80°90°100°151015202531
Avg high (°F)Avg low (°F)
18967
28967
38967
48967
58967
68967
78967
88967
98967
108967
118967
128967
138967
148967
158967
168967
178967
188967
198967
208967
218967
228967
238967
248967
258967
268967
278967
288967
298967
308967
318966

San Jacinto 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 daysSnow daysDaylight (hours)Travel score
Jan61° / 40°2.96.60.7105.6
Feb61° / 42°3.57.7110.75.5
Mar64° / 44°2.26.60.611.76.5
Apr69° / 48°1.14.50.312.87.6
May74° / 53°0.52.7013.78.6
Jun82° / 60°0.10.6014.28.1
Jul88° / 66°0.21.20145.8
Aug89° / 67°0.11013.35.5
Sep85° / 62°0.21012.26.9
Oct77° / 54°0.72.9011.18.6
Nov68° / 46°1.13.30.110.27.7
Dec60° / 40°2.35.50.49.85.6

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 88% 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 6%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
19010
29010
3919
4919
5928
6928
7937
8937
9946
10955
11955
12955
13955
14955
15955
16964
17964
18964
19964
20964
21964
22955
23955
24955
25955
26946
27946
28946
29937
30937
31937

Chance of precipitation in August

Any precipitation

San Jacinto gets around 0.1 in of rain over 1 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 3% and peaks near 4% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
14
24
34
44
54
64
74
83
93
103
113
123
133
143
153
163
173
183
193
203
213
223
233
243
254
264
274
284
294
304
314

Humidity in August

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, August lands in the dry band about 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
14235203
24335202
34434202
44533202
54533202
64632202
74731192
84831192
94831192
104930192
115030182
125030182
135129182
145129182
155229172
165129173
175229172
185329162
195230162
205330152
215330152
225430142
235430142
245629132
255629132
265629132
275729122
285829121
295630131
305630131
315630131

Wind in August

Winds average 3 mph in August.

Across August, daily wind ranges from about 3 mph on the calmest days to 3 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm
313calm

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 5:03 AM to 5:25 AM, and sunset from 6:45 PM to 6:11 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:036:45
213.75:046:44
313.65:046:43
413.65:056:42
513.65:066:41
613.65:076:40
713.55:076:39
813.55:086:38
913.55:096:37
1013.45:106:36
1113.45:106:35
1213.45:116:34
1313.45:126:33
1413.35:126:32
1513.35:136:31
1613.35:146:30
1713.25:156:29
1813.25:156:28
1913.25:166:26
2013.15:176:25
2113.15:186:24
2213.15:186:23
2313.05:196:22
2413.05:206:20
2513.05:206:19
2612.95:216:18
2712.95:226:16
2812.95:236:15
2912.85:236:14
3012.85:246:12
3112.85:256:11

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 7.23 kWh/m².

For context, solar energy here swings from a low near 3.08 kWh/m² to a high of 8.35 kWh/m² in June across the year — August's 7.23 kWh/m² falls in the middle.

02468151015202531
Solar energy (kWh/m²)Level
17.5Intense
27.5Intense
37.5Intense
47.5Intense
57.5Intense
67.4Intense
77.4Intense
87.4Intense
97.4Intense
107.4Intense
117.4Intense
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
316.8Intense
Planning a trip in August

Is August a good time to visit San Jacinto?

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

5.5
Sightseeing
11th-best month of the year
8.6
Beach & pool
4th-best month of the year

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

What to pack for San Jacinto in August

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

In August, San Jacinto sees daytime highs around 89°F and nights near 67°F. Pack light clothes and sun protection.

light clothessun protection

UV index in San Jacinto in August

LowModerateHighVery highExtreme

Clear-sky midday UV in August peaks 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 San Jacinto 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 — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 11Dec 17UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5High
Apr8Very high
May9Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep9Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in San Jacinto 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 San Jacinto 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 San Jacinto?

San Jacinto sits at 33.8°N, 117.0°W, 1,565 ft above sea level, in United States. The nearest listed city is Hemet, 2.5 mi away.

Topography around San Jacinto

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

Within 2 miles, the terrain around San Jacinto has only modest variations in elevation — a maximum elevation change of 522 ft around an average of 1,568 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 4,350 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,598 ft.

The land around San Jacinto is covered by artificial surfaces (50%) and grassland (23%) within 2 miles, shrubs (41%) and grassland (29%) within 10 miles, and shrubs (33%) within 50 miles.

2 miles
522 ft
10 miles
4,350 ft
50 miles
11,598 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: Hemet 2.5 mi · East Hemet 3.1 mi · Beaumont 9.9 mi · Banning 11 mi · Menifee 11 mi · Sun City 15 mi · Perris 16 mi · Yucaipa 18 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 San Jacinto (33.7839°, -116.9586°, elevation 1,565 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. 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).