Rosamond weather in September

In September, Rosamond sees average daytime highs of 86°F and overnight lows near 62°F, with 0.1 in of rain across 0.6 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 10th-wettest month of the year here.

Highs ease over the month, from about 90°F in the first days to 83°F by the end. The sky is clear or mostly clear about 89% 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 Rosamond's 1st-clearest and 12th-windiest month. For the whole year in context, see Rosamond's year-round climate.

Daytime high
86°
3rd warmest
Overnight low
62°
10th coldest
Rainfall
0.1 in
0.6 wet days
Daylight
12 h 12 min
5:41 AM – 5:53 PM
Cloud cover
13%
1st clearest
Wind
6 mph
12th windiest
Solar energy
6.47 kWh/m²
Travel score
6.8
out of 10

Rosamond is census-designated place in Kern County, California, United States.

Density
134/km²
people per km²

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 90°F in the first days to 83°F by the end.

A typical September day in Rosamond reaches about 86°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 77°F and 94°F. Set against its neighbours, September runs about 6°F cooler than August and about 10°F warmer than October.

60°80°100°151015202530
Avg high (°F)Avg low (°F)
19065
29065
39065
48965
58964
68964
78964
88864
98863
108863
118763
128762
138762
148762
158661
168661
178661
188561
198560
208560
218560
228460
238460
248459
258459
268359
278359
288358
298258
308258

How September really feels in Rosamond

Once humidity and wind are folded in, September averages 3 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
3
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.

Rosamond weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan57° / 39°1.64.69.94.7
Feb59° / 41°1.9510.75.2
Mar64° / 44°1.2411.76.9
Apr70° / 48°0.51.912.98.3
May78° / 54°0.1113.88.8
Jun86° / 60°0.10.314.36.8
Jul92° / 66°0.11.114.14.6
Aug92° / 66°0.10.513.34.6
Sep86° / 62°0.10.612.26.8
Oct76° / 53°0.31.111.18.9
Nov64° / 44°0.41.910.27.2
Dec56° / 39°1.23.69.74.6

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

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

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

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1946
2946
3946
4946
5946
6946
7946
8955
9955
10955
11955
12955
13955
14955
15955
16955
17955
18955
19955
20955
21955
22955
23946
24946
25937
26937
27937
28937
29937
30928

Chance of precipitation in September

Any precipitation

Rosamond gets around 0.1 in of rain over 0.6 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 2% and peaks near 3% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
13
23
33
43
53
63
73
83
92
102
112
122
132
141
151
161
171
181
191
201
211
221
231
241
251
261
272
282
292
302

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 94% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
18893
28893
38893
48893
58983
68983
79073
89172
99262
109262
119352
129541
139541
149631
159631
169631
179721
189721
199721
209820
219820
229820
239820
249730
259730
269730
279730
289730
299820
309820

Wind in September

Winds average 6 mph in September, the calmest month.

Across September, daily wind ranges from about 6 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
66calm
76calm
86calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
296calm
306calm

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 5:29 AM to 5:51 AM, and sunset from 6:15 PM to 5:33 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:296:15
212.75:306:14
312.75:316:13
412.75:326:11
512.65:326:10
612.65:336:08
712.55:346:07
812.55:356:05
912.55:356:04
1012.45:366:02
1112.45:376:01
1212.45:385:59
1312.35:385:58
1412.35:395:56
1512.35:405:55
1612.25:415:53
1712.25:415:52
1812.15:425:50
1912.15:435:49
2012.15:445:47
2112.05:445:46
2212.05:455:44
2312.05:465:43
2411.95:475:42
2511.95:475:40
2611.85:485:39
2711.85:495:37
2811.85:505:36
2911.75:505:34
3011.75:515:33

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.47 kWh/m².

For context, solar energy here swings from a low near 3.03 kWh/m² to a high of 8.57 kWh/m² in June across the year — September's 6.47 kWh/m² falls in the middle.

02468151015202530
Solar energy (kWh/m²)Level
17.0Intense
27.0Intense
36.9Intense
46.9Intense
56.9Intense
66.8Intense
76.8Intense
86.8Intense
96.7Intense
106.7Intense
116.7Intense
126.6Intense
136.6Intense
146.6Intense
156.5Intense
166.5Intense
176.4Intense
186.4Intense
196.3Intense
206.3Intense
216.3Intense
226.2Intense
236.2Intense
246.1Intense
256.1Intense
266.0Intense
276.0Bright
285.9Bright
295.9Bright
305.8Bright
Planning a trip in September

Is September a good time to visit Rosamond?

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

6.8
Sightseeing
6th-best month of the year
9.0
Beach & pool
1st-best month of the year

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

What to pack for Rosamond in September

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

In September, Rosamond sees daytime highs around 86°F and nights near 62°F. Pack light clothes and sun protection.

light clothessun protection

UV index in Rosamond 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 Rosamond peaks around June 21 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 highModerateJun 21UV 11Dec 16UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5High
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Rosamond 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 Rosamond is worst in December — around 29 µg/m³ PM2.5 (moderate), about 2.4× the cleanest month (May, 12 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateDec 1428 µg/m³May 1812 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb17Moderate
Mar17Moderate
Apr15Moderate
May12Good
Jun14Moderate
Jul25Moderate
Aug26Moderate
Sep24Moderate
Oct18Moderate
Nov23Moderate
Dec29Moderate
Location & terrain

Where is Rosamond?

Rosamond sits at 34.9°N, 118.2°W, 2,343 ft above sea level, in United States. The nearest listed city is Lancaster, 12 mi away.

Topography around Rosamond

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

Within 2 miles, the terrain around Rosamond has only modest variations in elevation — a maximum elevation change of 761 ft around an average of 2,385 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,886 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,708 ft.

The land around Rosamond is covered by grassland (35%), bare terrain (35%) and artificial surfaces (21%) within 2 miles, grassland (60%) and bare terrain (34%) within 10 miles, and grassland (41%) and bare terrain (22%) within 50 miles.

2 miles
761 ft
10 miles
1,886 ft
50 miles
9,708 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Lancaster 12 mi · Palmdale 20 mi · Vincent 25 mi · Canyon Country 35 mi · Castaic 37 mi · Valencia 39 mi · Santa Clarita 39 mi · Stevenson Ranch 40 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 Rosamond (34.8641°, -118.1634°, elevation 2,343 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).