Apple Valley weather in September

In September, Apple Valley sees average daytime highs of 87°F and overnight lows near 62°F, with 0.2 in of rain across 1 wet days and about 12.2 hours of daylight. It is the 4th-warmest and 11th-wettest month of the year here.

Highs ease over the month, from about 91°F in the first days to 83°F by the end. The sky is clear or mostly clear about 87% of the time in September, and the air most often feels dry.

Daylight stretches from about 12 h 48 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Apple Valley's 2nd-clearest and 12th-windiest month. For the whole year in context, see Apple Valley's year-round climate.

Daytime high
87°
4th warmest
Overnight low
62°
10th coldest
Rainfall
0.2 in
1 wet days
Daylight
12 h 12 min
5:37 AM – 5:49 PM
Cloud cover
15%
2nd clearest
Wind
5 mph
12th windiest
Solar energy
6.38 kWh/m²
Travel score
6.3
out of 10

Apple Valley is incorporated town in San Bernardino County, California, United States.

Density
373/km²
people per km²
Founded
1988

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 91°F in the first days to 83°F by the end.

A typical September day in Apple Valley reaches about 87°F in the afternoon and slips back to 62°F overnight — a 25°F spread between the day's warmth and the night's chill. On most days the high lands between 78°F and 95°F. Set against its neighbours, September runs about 6°F cooler than August and about 11°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19166
29166
39165
49165
59065
69065
79065
88964
98964
108964
118863
128863
138863
148762
158762
168762
178762
188662
198661
208661
218561
228561
238560
248560
258460
268460
278459
288359
298359
308258

How September really feels in Apple Valley

Once humidity and wind are folded in, September averages 7 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
7
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

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

Apple Valley weather by month

How September compares with the rest of the year at a glance. September is the 4th-warmest and 11th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan56° / 39°1.550.6104.5
Feb59° / 40°1.95.70.810.75.0
Mar64° / 44°1.14.60.511.76.7
Apr70° / 47°0.62.80.112.88.1
May78° / 54°0.21.6013.88.6
Jun87° / 60°0.10.4014.36.2
Jul93° / 67°0.32.4014.13.9
Aug93° / 67°0.21.7013.33.9
Sep87° / 62°0.21012.26.3
Oct76° / 53°0.31.5011.18.8
Nov64° / 44°0.52.40.210.27.2
Dec55° / 38°1.33.90.39.74.4

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 87% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 6% of September, with mostly cloudy or overcast conditions the remaining 7%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1928
2928
3928
4937
5937
6937
7937
8937
9946
10946
11946
12946
13946
14946
15946
16946
17946
18937
19937
20937
21937
22937
23937
24928
25928
26928
27928
28928
29928
30928

Chance of precipitation in September

Any precipitation

Apple Valley gets around 0.2 in of rain over 1 wet days in September. 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 6% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
16
26
36
46
55
65
75
84
94
104
113
123
133
142
152
162
172
182
192
202
212
222
232
242
253
263
273
283
293
303

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the dry band about 95% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
18992
28992
38992
49082
59082
69172
79172
89262
99262
109451
119451
129541
139631
149631
159631
169631
179721
189721
199721
209721
219721
229631
239631
249631
259730
269730
279730
289730
299730
309820

Wind in September

Winds average 5 mph in September, the calmest month.

Across September, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 48 min at the start of September to 11 h 42 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over September. Sunrise moves from 5:26 AM to 5:47 AM, and sunset from 6:11 PM to 5:29 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:266:11
212.75:266:10
312.75:276:08
412.75:286:07
512.65:296:06
612.65:296:04
712.55:306:03
812.55:316:01
912.55:326:00
1012.45:325:58
1112.45:335:57
1212.45:345:55
1312.35:345:54
1412.35:355:52
1512.25:365:51
1612.25:375:49
1712.25:375:48
1812.15:385:46
1912.15:395:45
2012.15:405:44
2112.05:405:42
2212.05:415:41
2312.05:425:39
2411.95:435:38
2511.95:435:36
2611.85:445:35
2711.85:455:33
2811.85:465:32
2911.75:465:30
3011.75:475:29

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.38 kWh/m².

For context, solar energy here swings from a low near 3.08 kWh/m² to a high of 8.51 kWh/m² in June across the year — September's 6.38 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.9Intense
26.8Intense
36.8Intense
46.8Intense
56.7Intense
66.7Intense
76.7Intense
86.7Intense
96.6Intense
106.6Intense
116.6Intense
126.5Intense
136.5Intense
146.5Intense
156.4Intense
166.4Intense
176.4Intense
186.3Intense
196.3Intense
206.3Intense
216.2Intense
226.2Intense
236.1Intense
246.1Intense
256.0Intense
266.0Bright
275.9Bright
285.9Bright
295.8Bright
305.8Bright
Planning a trip in September

Is September a good time to visit Apple Valley?

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

6.3
Sightseeing
6th-best month of the year
8.8
Beach & pool
2nd-best month of the year

September is a reasonable time to visit Apple Valley for sightseeing. The water and warmth also suit a beach or pool day.

What to pack for Apple Valley in September

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

In September, Apple Valley sees daytime highs around 87°F and nights near 62°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Apple Valley in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September 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 Apple Valley 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 Apple Valley in September

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Apple Valley 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 Apple Valley?

Apple Valley sits at 34.5°N, 117.2°W, 2,946 ft above sea level, in United States. The nearest listed city is Victorville, 6.2 mi away.

Topography around Apple Valley

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

Within 2 miles, the terrain around Apple Valley has only modest variations in elevation — a maximum elevation change of 141 ft around an average of 2,946 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,720 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,112 ft.

The land around Apple Valley is covered by artificial surfaces (42%), grassland (24%) and bare terrain (24%) within 2 miles, grassland (46%) and bare terrain (21%) within 10 miles, and bare terrain (42%) and shrubs (22%) within 50 miles.

2 miles
141 ft
10 miles
2,720 ft
50 miles
11,112 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrain
September weather nearby: Victorville 6.2 mi · Hesperia 8.1 mi · Adelanto 14 mi · Highland 25 mi · Barstow Heights 27 mi · San Bernardino 28 mi · Barstow 29 mi · Rialto 29 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 Apple Valley (34.5008°, -117.1859°, elevation 2,946 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).