Hermosa Beach weather in September

In September, Hermosa Beach sees average daytime highs of 71°F and overnight lows near 64°F, with 0.1 in of rain across 0.4 wet days and about 12.2 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.

Day-to-day highs hold fairly steady near 71°F through the month. The sky is clear or mostly clear about 85% of the time in September, and the air most often feels humid.

Daylight stretches from about 12 h 42 min at the start of September to 11 h 42 min by month's end. Set against the rest of the year, September is Hermosa Beach's 2nd-clearest and 10th-windiest month. For the whole year in context, see Hermosa Beach's year-round climate.

Daytime high
71°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
0.1 in
0.4 wet days
Daylight
12 h 12 min
5:42 AM – 5:54 PM
Cloud cover
19%
2nd clearest
Wind
7 mph
10th windiest
Solar energy
6.13 kWh/m²
Travel score
8.9
out of 10

Hermosa Beach is city in Los Angeles County, California, United States.

Density
5,375/km²
people per km²
Founded
1907

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

Temperature in September

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 71°F through the month.

A typical September day in Hermosa Beach reaches about 71°F in the afternoon and slips back to 64°F overnight — a 7°F spread between the day's warmth and the night's chill. On most days the high lands between 67°F and 76°F. Set against its neighbours, September runs on par with August and about 2°F warmer than October.

60°65°70°75°80°151015202530
Avg high (°F)Avg low (°F)
17265
27265
37265
47265
57265
67265
77265
87165
97165
107165
117165
127165
137165
147164
157164
167164
177164
187164
197164
207164
217164
227164
237164
247164
257164
267164
277164
287164
297164
307164

Hermosa Beach weather by month

How September compares with the rest of the year at a glance. September is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan61° / 53°2.75.5105.8
Feb61° / 53°2.95.810.75.6
Mar61° / 54°1.74.311.76.0
Apr62° / 56°0.62.212.86.9
May64° / 58°0.21.113.77.6
Jun67° / 61°0.00.214.28.2
Jul70° / 64°0.10.3148.7
Aug71° / 65°0.00.113.39.1
Sep71° / 64°0.10.412.28.9
Oct69° / 62°0.51.611.18.4
Nov65° / 57°0.72.610.27.6
Dec61° / 53°1.94.69.86.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 85% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 9% 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
7955
8955
9955
10955
11955
12955
13955
14955
15955
16946
17946
18946
19946
20937
21937
22937
23937
24937
25928
26928
27919
28928
29928
30928

Chance of precipitation in September

Any precipitation

Hermosa Beach gets around 0.1 in of rain over 0.4 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 1% and peaks near 2% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
11
21
31
42
52
62
72
82
91
101
111
121
131
141
151
161
171
181
191
201
211
221
232
242
252
262
272
282
292
302

Humidity in September

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, September lands in the humid band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 10% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
10226414
20226414
30236314
40246115
50256015
60265915
70275914
81285714
91295614
101295713
111305712
121315612
131325611
142335510
152335510
16234559
17334558
18334558
19335557
20435547
21435556
22435556
23536536
24537535
25637525
26638515
27739495
28840474
29942464
301043444

Wind in September

Winds average 7 mph in September.

Across September, daily wind ranges from about 6 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
296calm
306calm

Sunrise & sunset in September

DaylightNight

Daylight runs from about 12 h 42 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 60 minutes over September. Sunrise moves from 5:31 AM to 5:52 AM, and sunset from 6:15 PM to 5:34 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:316:15
212.75:326:14
312.75:336:13
412.65:336:11
512.65:346:10
612.65:356:09
712.55:356:07
812.55:366:06
912.55:376:04
1012.45:376:03
1112.45:386:01
1212.45:396:00
1312.35:405:58
1412.35:405:57
1512.25:415:56
1612.25:425:54
1712.25:425:53
1812.15:435:51
1912.15:445:50
2012.15:455:48
2112.05:455:47
2212.05:465:45
2312.05:475:44
2411.95:475:43
2511.95:485:41
2611.85:495:40
2711.85:505:38
2811.85:505:37
2911.75:515:35
3011.75:525:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.13 kWh/m².

For context, solar energy here swings from a low near 2.99 kWh/m² to a high of 7.91 kWh/m² in June across the year — September's 6.13 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.7Intense
46.6Intense
56.6Intense
66.5Intense
76.5Intense
86.5Intense
96.4Intense
106.4Intense
116.3Intense
126.3Intense
136.3Intense
146.2Intense
156.2Intense
166.1Intense
176.1Intense
186.0Intense
196.0Intense
206.0Bright
215.9Bright
225.9Bright
235.8Bright
245.8Bright
255.7Bright
265.7Bright
275.6Bright
285.6Bright
295.5Bright
305.5Bright
Planning a trip in September

Is September a good time to visit Hermosa Beach?

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

8.9
Sightseeing
2nd-best month of the year
6.0
Beach & pool
2nd-best month of the year

September is one of the better times to visit Hermosa Beach for general sightseeing.

What to pack for Hermosa Beach in September

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

In September, Hermosa Beach sees daytime highs around 71°F and nights near 64°F. Pack sun protection.

sun protection

Sea temperature near Hermosa Beach in September

The nearest coast averages about 68°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore is warmest in August at about 68°F and coldest in February near 59°F.

It's comfortable for a long swim from Aug 4 to Sep 13 — about 1.3 months when the water holds above 68°F.

60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan59Bracing
Feb59Bracing
Mar59Bracing
Apr59Cool
May62Cool
Jun65Cool
Jul67Cool
Aug68Refreshing
Sep68Refreshing
Oct66Cool
Nov63Cool
Dec60Cool

UV index in Hermosa Beach in September

LowModerateHighVery highExtreme

Clear-sky midday UV in September peaks around 8 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Hermosa Beach 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
Jan3Moderate
Feb5Moderate
Mar5Moderate
Apr7Very high
May7Very high
Jun11Extreme
Jul11Extreme
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec3Moderate

Air quality in Hermosa Beach 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 Hermosa Beach is worst in November — around 37 µg/m³ PM2.5 (poor), about 2.7× the cleanest month (May, 14 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateNov 1736 µg/m³May 2114 µg/m³
PM2.5 (µg/m³)Level
Jan26Moderate
Feb24Moderate
Mar22Moderate
Apr20Moderate
May14Moderate
Jun16Moderate
Jul24Moderate
Aug20Moderate
Sep32Moderate
Oct24Moderate
Nov37Poor
Dec27Moderate
Location & terrain

Where is Hermosa Beach?

Hermosa Beach sits at 33.9°N, 118.4°W, 26 ft above sea level, in United States. The nearest listed city is Redondo Beach, 1.2 mi away.

Topography around Hermosa Beach

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

Within 2 miles, the terrain around Hermosa Beach has only modest variations in elevation — a maximum elevation change of 243 ft around an average of 66 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,483 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 9,327 ft.

The land around Hermosa Beach is covered by artificial surfaces (51%) and water (44%) within 2 miles, artificial surfaces (47%) and water (43%) within 10 miles, and water (47%) and artificial surfaces (21%) within 50 miles.

2 miles
243 ft
10 miles
1,483 ft
50 miles
9,327 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Redondo Beach 1.2 mi · Manhattan Beach 1.9 mi · Lawndale 3.1 mi · Torrance 3.7 mi · El Segundo 4.3 mi · Hawthorne 4.3 mi · Gardena 5.6 mi · Lennox 5.6 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 Hermosa Beach (33.8622°, -118.3995°, elevation 26 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. 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).