San Pedro weather in September

In September, San Pedro sees average daytime highs of 77°F and overnight lows near 64°F, with 0.1 in of rain across 0.5 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 77°F through the month. The sky is clear or mostly clear about 84% 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 San Pedro's 2nd-clearest and 8th-windiest month. For the whole year in context, see San Pedro's year-round climate.

Daytime high
77°
2nd warmest
Overnight low
64°
11th coldest
Rainfall
0.1 in
0.5 wet days
Daylight
12 h 12 min
5:41 AM – 5:54 PM
Cloud cover
19%
2nd clearest
Wind
6 mph
8th windiest
Solar energy
6.16 kWh/m²
Travel score
9.2
out of 10

San Pedro is neighborhood city of Los Angeles, California, United States.

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 77°F through the month.

A typical September day in San Pedro reaches about 77°F in the afternoon and slips back to 64°F overnight — a 13°F spread between the day's warmth and the night's chill. On most days the high lands between 71°F and 84°F. Set against its neighbours, September runs on par with August and about 3°F warmer than October.

60°70°80°151015202530
Avg high (°F)Avg low (°F)
17865
27865
37865
47865
57865
67865
77865
87865
97865
107765
117765
127765
137764
147764
157764
167764
177764
187764
197664
207664
217664
227664
237664
247664
257664
267664
277663
287663
297663
307663

San Pedro 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
Jan63° / 51°2.75.3106.4
Feb63° / 52°2.95.710.76.4
Mar65° / 53°1.74.711.76.9
Apr67° / 55°0.62.212.87.7
May69° / 58°0.31.113.78.2
Jun72° / 61°0.10.214.28.9
Jul76° / 64°0.10.3149.3
Aug78° / 65°0.00.113.39.2
Sep77° / 64°0.10.512.29.2
Oct74° / 61°0.51.711.28.9
Nov68° / 55°0.72.610.27.9
Dec63° / 51°1.94.69.86.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 84% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 8%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1946
2946
3946
4946
5946
6937
7937
8937
9937
10937
11937
12937
13937
14937
15937
16937
17937
18928
19919
20919
21919
22919
23919
24919
25919
269010
279010
289010
299010
30919

Chance of precipitation in September

Any precipitation

San Pedro gets around 0.1 in of rain over 0.5 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 (%)
11
21
31
41
51
61
71
82
92
102
112
122
132
142
152
162
172
182
192
202
212
222
232
242
252
262
272
282
293
303

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 52% of days. Sticky, muggy-or-worse air turns up on roughly 8% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
11276012
21276012
31285912
41295812
51305712
61315612
71325512
81335412
91345411
101355410
111365310
12137539
13238528
14238528
15338527
16339517
17439516
18438526
19538525
20538525
21638515
22638515
23738514
24838504
25839494
26939484
271040464
281141444
291241434
301342413

Wind in September

Winds average 6 mph in September.

Across September, daily wind ranges from about 5 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
305calm

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 5:51 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
312.75:326:12
412.65:336:11
512.65:346:09
612.65:346:08
712.55:356:07
812.55:366:05
912.55:366:04
1012.45:376:02
1112.45:386:01
1212.35:385:59
1312.35:395:58
1412.35:405:57
1512.25:415:55
1612.25:415:54
1712.25:425:52
1812.15:435:51
1912.15:435:49
2012.15:445:48
2112.05:455:46
2212.05:465:45
2312.05:465:44
2411.95:475:42
2511.95:485:41
2611.85:485:39
2711.85:495:38
2811.85:505:36
2911.75:515:35
3011.75:515:34

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.16 kWh/m².

For context, solar energy here swings from a low near 2.99 kWh/m² to a high of 7.94 kWh/m² in June across the year — September's 6.16 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.8Intense
26.7Intense
36.7Intense
46.7Intense
56.6Intense
66.6Intense
76.5Intense
86.5Intense
96.4Intense
106.4Intense
116.4Intense
126.3Intense
136.3Intense
146.2Intense
156.2Intense
166.2Intense
176.1Intense
186.1Intense
196.0Intense
206.0Bright
215.9Bright
225.9Bright
235.8Bright
245.8Bright
255.8Bright
265.7Bright
275.7Bright
285.6Bright
295.6Bright
305.5Bright
Planning a trip in September

Is September a good time to visit San Pedro?

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

9.2
Sightseeing
2nd-best month of the year
8.2
Beach & pool
2nd-best month of the year

September is one of the better times to visit San Pedro for general sightseeing. The water and warmth also suit a beach or pool day.

What to pack for San Pedro in September

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

In September, San Pedro sees daytime highs around 77°F and nights near 64°F. Pack sun protection. Worth having: light clothes.

sun protectionlight clothes

Sea temperature near San Pedro in September

The nearest coast averages about 69°F in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 9 mi away) is warmest in August at about 69°F and coldest in February near 59°F.

It's comfortable for a long swim from Jul 25 to Sep 24 — about 2 months when the water holds above 68°F.

60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°F)Comfort
Jan59Cool
Feb59Bracing
Mar59Cool
Apr60Cool
May62Cool
Jun65Cool
Jul68Cool
Aug69Refreshing
Sep69Refreshing
Oct67Cool
Nov64Cool
Dec60Cool

UV index in San Pedro 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 San Pedro peaks around June 23 at about 10 (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 10Dec 16UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5Moderate
Apr7Very high
May8Very high
Jun11Extreme
Jul10Extreme
Aug10Very high
Sep8Very high
Oct5High
Nov3Moderate
Dec3Moderate

Air quality in San Pedro 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 San Pedro 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 San Pedro?

San Pedro sits at 33.7°N, 118.3°W, 112 ft above sea level, in United States. The nearest listed city is Wilmington, 3.7 mi away.

Topography around San Pedro

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

Within 2 miles, the terrain around San Pedro has significant variations in elevation — a maximum elevation change of 909 ft around an average of 167 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,499 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 8,412 ft.

The land around San Pedro is covered by artificial surfaces (66%) within 2 miles, water (57%) and artificial surfaces (33%) within 10 miles, and water (52%) and artificial surfaces (21%) within 50 miles.

2 miles
909 ft
10 miles
1,499 ft
50 miles
8,412 ft
treesshrubsgrasslandartificial surfacesbare terrainwater
September weather nearby: Wilmington 3.7 mi · Lomita 4.3 mi · Rancho Palos Verdes 5.6 mi · West Carson 6.2 mi · Long Beach 6.2 mi · Carson 6.8 mi · Torrance 7.5 mi · Redondo Beach 9.3 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 San Pedro (33.7358°, -118.2923°, elevation 112 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).