Highland weather in August

In August, Highland sees average daytime highs of 89°F and overnight lows near 65°F, with 0.4 in of rain across 3 wet days and about 13.3 hours of daylight. It is the 1st-warmest and 9th-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 86% 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 Highland's 3rd-clearest and 11th-windiest month. For the whole year in context, see Highland's year-round climate.

Daytime high
89°
1st warmest
Overnight low
65°
12th coldest
Rainfall
0.4 in
3 wet days
Daylight
13 h 18 min
5:14 AM – 6:31 PM
Cloud cover
16%
3rd clearest
Wind
4 mph
11th windiest
Solar energy
7.33 kWh/m²
Travel score
5.3
out of 10

Highland is city in San Bernardino County, California, United States.

Density
1,121/km²
people per km²
Founded
1891

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 Highland reaches about 89°F in the afternoon and slips back to 65°F overnight — a 24°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 5°F warmer than September.

60°80°100°151015202531
Avg high (°F)Avg low (°F)
19066
29066
38965
48965
58965
68965
78965
88965
98965
108965
118965
128965
138965
148965
158965
168965
178965
188965
198965
208965
218965
228965
238965
248965
258965
268965
278965
288965
298965
308965
318865

How August really feels in Highland

Once humidity and wind are folded in, August averages 2 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
2
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

The story in August is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Highland weather by month

How August compares with the rest of the year at a glance. August is the 1st-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan57° / 40°2.25.60.9104.7
Feb58° / 40°2.76.61.110.74.8
Mar62° / 43°1.65.70.911.76.2
Apr68° / 46°0.83.30.312.87.7
May75° / 52°0.32.5013.88.7
Jun83° / 58°0.10.7014.27.8
Jul89° / 65°0.52.90145.4
Aug89° / 65°0.43013.35.3
Sep85° / 61°0.31.6012.27.2
Oct75° / 53°0.52.1011.18.8
Nov64° / 45°0.72.90.210.27.2
Dec57° / 39°1.74.60.59.84.7

Cloud cover in August

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 86% of the time in August.

Beyond those clear spells, partly cloudy skies cover about 7% of August, with mostly cloudy or overcast conditions the remaining 7%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18911
28911
39010
49010
59010
6928
7928
8928
9937
10937
11946
12955
13955
14955
15955
16955
17955
18955
19946
20946
21946
22946
23946
24946
25946
26946
27946
28946
29946
30937
31937

Chance of precipitation in August

Any precipitation

Highland gets around 0.4 in of rain over 3 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 10% and peaks near 11% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
110
210
310
410
511
611
711
811
911
1010
1110
1210
1310
1410
1510
1610
1710
1810
1910
209
219
229
239
249
259
269
2710
2810
2910
3010
3110

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 77% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1702181
2722080
3732070
4732070
5732070
6732070
7732070
8751960
9751960
10751960
11751960
12751960
13761860
14761860
15761860
16761860
17771760
18771760
19781660
20781660
21791560
22791560
23801460
24801460
25821350
26821350
27821350
28811450
29811450
30821440
31821440

Wind in August

Winds average 4 mph in August.

Across August, daily wind ranges from about 3 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
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 6:46 PM to 6:12 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.75:036:46
213.75:046:46
313.75:056:45
413.65:066:44
513.65:066:43
613.65:076:42
713.65:086:41
813.55:086:40
913.55:096:39
1013.55:106:38
1113.45:116:37
1213.45:116:36
1313.45:126:35
1413.35:136:34
1513.35:146:33
1613.35:146:31
1713.35:156:30
1813.25:166:29
1913.25:176:28
2013.25:176:27
2113.15:186:25
2213.15:196:24
2313.15:206:23
2413.05:206:22
2513.05:216:20
2613.05:226:19
2712.95:236:18
2812.95:236:16
2912.95:246:15
3012.85:256:14
3112.85:256:12

Solar energy in August

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in August, about 7.33 kWh/m².

For context, solar energy here swings from a low near 3.04 kWh/m² to a high of 8.39 kWh/m² in June across the year — August's 7.33 kWh/m² falls in the middle.

02468151015202531
Solar energy (kWh/m²)Level
17.6Intense
27.6Intense
37.6Intense
47.6Intense
57.6Intense
67.6Intense
77.5Intense
87.5Intense
97.5Intense
107.5Intense
117.5Intense
127.5Intense
137.4Intense
147.4Intense
157.4Intense
167.3Intense
177.3Intense
187.3Intense
197.3Intense
207.2Intense
217.2Intense
227.2Intense
237.1Intense
247.1Intense
257.0Intense
267.0Intense
277.0Intense
286.9Intense
296.9Intense
306.9Intense
316.8Intense
Planning a trip in August

Is August a good time to visit Highland?

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

5.3
Sightseeing
9th-best month of the year
8.2
Beach & pool
4th-best month of the year

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

What to pack for Highland in August

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

In August, Highland sees daytime highs around 89°F and nights near 65°F. Pack light clothes and sun protection. About 3 days see rain.

light clothessun protection

UV index in Highland 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 Highland peaks around June 23 at about 11 (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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 11Dec 16UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5High
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov4Moderate
Dec3Moderate

Air quality in Highland 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 Highland is worst in September — around 30 µg/m³ PM2.5 (moderate), about 5.3× the cleanest month (December, 6 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodSep 1427 µg/m³Dec 146 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar9Good
Apr9Good
May9Good
Jun16Moderate
Jul12Good
Aug15Moderate
Sep30Moderate
Oct7Good
Nov6Good
Dec6Good
Location & terrain

Where is Highland?

Highland sits at 34.1°N, 117.2°W, 1,309 ft above sea level, in United States. The nearest listed city is San Bernardino, 5.0 mi away.

Topography around Highland

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

Within 2 miles, the terrain around Highland has significant variations in elevation — a maximum elevation change of 1,558 ft around an average of 1,394 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 6,699 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,411 ft.

The land around Highland is covered by artificial surfaces (57%) within 2 miles, trees (28%), artificial surfaces (28%) and shrubs (24%) within 10 miles, and shrubs (29%) and bare terrain (21%) within 50 miles.

2 miles
1,558 ft
10 miles
6,699 ft
50 miles
11,411 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
August weather nearby: San Bernardino 5.0 mi · Redlands 5.0 mi · Loma Linda 6.2 mi · Colton 6.8 mi · Rialto 9.3 mi · Bloomington 11 mi · Yucaipa 12 mi · Fontana 13 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 Highland (34.1283°, -117.2087°, elevation 1,309 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).