Barstow Heights weather in May

In May, Barstow Heights sees average daytime highs of 81°F and overnight lows near 57°F, with 0.1 in of rain across 0.8 wet days and about 13.8 hours of daylight. It is the 5th-warmest and 11th-wettest month of the year here.

Highs climb over the month, from about 78°F in the first days to 85°F by the end. The sky is clear or mostly clear about 75% of the time in May, and the air most often feels dry.

Daylight stretches from about 13 h 24 min at the start of May to 14 h 06 min by month's end. Set against the rest of the year, May is Barstow Heights's 6th-clearest and 2nd-windiest month. For the whole year in context, see Barstow Heights's year-round climate.

Daytime high
81°
5th warmest
Overnight low
57°
8th coldest
Rainfall
0.1 in
0.8 wet days
Daylight
13 h 48 min
4:50 AM – 6:39 PM
Cloud cover
24%
6th clearest
Wind
9 mph
2nd windiest
Solar energy
8.19 kWh/m²
Travel score
8.2
out of 10

Barstow Heights is human settlement in San Bernardino County, California, United States of America.

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

Temperature in May

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 78°F in the first days to 85°F by the end.

A typical May day in Barstow Heights reaches about 81°F in the afternoon and slips back to 57°F overnight — a 25°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 92°F. Set against its neighbours, May runs about 9°F warmer than April and about 10°F cooler than June.

40°60°80°100°151015202531
Avg high (°F)Avg low (°F)
17853
27854
37854
47854
57955
67955
77955
87955
98055
108055
118056
128056
138056
148156
158156
168156
178157
188257
198257
208257
218257
228358
238358
248358
258358
268459
278459
288559
298560
308560
318660

How May really feels in Barstow Heights

Once humidity and wind are folded in, May averages 0 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
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

May sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Barstow Heights weather by month

How May compares with the rest of the year at a glance. May is the 5th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan57° / 39°0.83.69.94.9
Feb60° / 41°1.03.910.75.8
Mar67° / 45°0.62.711.77.5
Apr73° / 49°0.41.812.98.6
May81° / 57°0.10.813.88.2
Jun91° / 64°0.10.414.34.9
Jul96° / 70°0.3214.12.7
Aug96° / 70°0.21.213.33.0
Sep89° / 64°0.1112.25.6
Oct77° / 54°0.2111.18.8
Nov65° / 44°0.31.510.27.4
Dec56° / 38°0.82.99.74.6

Cloud cover in May

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 75% of the time in May.

Beyond those clear spells, partly cloudy skies cover about 12% of May, with mostly cloudy or overcast conditions the remaining 13%.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18515
28515
38515
48515
58515
68515
78515
88515
98515
108515
118515
128515
138614
148614
158614
168614
178614
188614
198614
208713
218713
228812
238812
248812
258812
268911
278911
288911
298911
309010
319010

Chance of precipitation in May

Any precipitation

Barstow Heights gets around 0.1 in of rain over 0.8 wet days in May. 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
53
63
73
83
93
103
113
123
133
143
153
163
173
183
193
203
213
223
233
243
253
263
273
283
293
303
313

Humidity in May

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, May lands in the dry band about 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)
1100
2100
3100
4100
5100
6100
7100
8100
9100
10100
11100
12100
13100
14100
15100
16100
17100
18100
19100
20100
21100
22100
23100
24100
25100
26100
27100
28100
29100
30100
31100

Wind in May

Winds average 9 mph in May.

Across May, daily wind ranges from about 8 mph on the calmest days to 9 mph at its breeziest. It stays fairly steady from day to day.

051015151015202531
Wind speed (mph)Feels
19light breeze
29light breeze
39light breeze
49light breeze
59light breeze
69light breeze
79light breeze
89light breeze
99light breeze
109light breeze
119light breeze
129light breeze
139light breeze
149light breeze
159light breeze
169light breeze
179light breeze
189light breeze
199light breeze
209light breeze
219light breeze
229light breeze
239light breeze
249light breeze
259light breeze
269light breeze
279light breeze
289light breeze
298light breeze
308light breeze
318light breeze

Sunrise & sunset in May

DaylightNight

Daylight runs from about 13 h 24 min at the start of May to 14 h 06 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 42 minutes over May. Sunrise moves from 5:04 AM to 4:41 AM, and sunset from 6:27 PM to 6:50 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
113.45:046:27
213.45:036:28
313.45:026:29
413.55:016:29
513.55:006:30
613.54:596:31
713.64:586:32
813.64:576:33
913.64:566:34
1013.74:556:34
1113.74:546:35
1213.74:536:36
1313.74:526:37
1413.84:516:38
1513.84:516:38
1613.84:506:39
1713.84:496:40
1813.94:486:41
1913.94:486:41
2013.94:476:42
2113.94:466:43
2214.04:466:44
2314.04:456:44
2414.04:446:45
2514.04:446:46
2614.14:436:47
2714.14:436:47
2814.14:426:48
2914.14:426:49
3014.14:426:49
3114.14:416:50

Solar energy in May

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in May, about 8.19 kWh/m².

For context, solar energy here swings from a low near 3.13 kWh/m² to a high of 8.62 kWh/m² in June across the year — May's 8.19 kWh/m² sits near the top of that range.

02468151015202531
Solar energy (kWh/m²)Level
17.9Intense
27.9Intense
38.0Intense
48.0Intense
58.0Intense
68.0Intense
78.0Intense
88.1Intense
98.1Intense
108.1Intense
118.1Intense
128.1Intense
138.1Intense
148.2Intense
158.2Intense
168.2Intense
178.2Intense
188.2Intense
198.2Intense
208.2Intense
218.3Intense
228.3Intense
238.3Intense
248.3Intense
258.3Intense
268.3Intense
278.4Intense
288.4Intense
298.4Intense
308.4Intense
318.4Intense
Planning a trip in May

Is May a good time to visit Barstow Heights?

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

8.2
Sightseeing
3rd-best month of the year
8.6
Beach & pool
1st-best month of the year

May is one of the better times to visit Barstow Heights for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Barstow Heights in May

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

In May, Barstow Heights sees daytime highs around 81°F and nights near 57°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Barstow Heights in May

LowModerateHighVery highExtreme

Clear-sky midday UV in May peaks around 8 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Barstow Heights 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
Jan3Moderate
Feb5Moderate
Mar5High
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Barstow Heights in May

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Barstow Heights 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 Barstow Heights?

Barstow Heights sits at 34.9°N, 117.1°W, 2,559 ft above sea level, in United States. The nearest listed city is Barstow, 2.5 mi away.

Topography around Barstow Heights

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

Within 2 miles, the terrain around Barstow Heights has significant variations in elevation — a maximum elevation change of 948 ft around an average of 2,523 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,077 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 8,855 ft.

The land around Barstow Heights is covered by bare terrain (82%) within 2 miles, bare terrain (89%) within 10 miles, and bare terrain (67%) within 50 miles.

2 miles
948 ft
10 miles
2,077 ft
50 miles
8,855 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrain
May weather nearby: Barstow 2.5 mi · Apple Valley 27 mi · Victorville 27 mi · Adelanto 28 mi · Hesperia 34 mi · Highland 52 mi · San Bernardino 54 mi · Rialto 56 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 Barstow Heights (34.8697°, -117.0562°, elevation 2,559 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).