Newport Beach weather in September

In September, Newport Beach sees average daytime highs of 69°F and overnight lows near 65°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 69°F through the month. The sky is clear or mostly clear about 79% 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 Newport Beach's 2nd-clearest and 8th-windiest month. For the whole year in context, see Newport Beach's year-round climate.

Daytime high
69°
2nd warmest
Overnight low
65°
11th coldest
Rainfall
0.1 in
0.5 wet days
Daylight
12 h 12 min
5:40 AM – 5:52 PM
Cloud cover
22%
2nd clearest
Wind
7 mph
8th windiest
Solar energy
6.09 kWh/m²
Travel score
8.6
out of 10

Newport Beach is city in Orange County, California, United States.

Density
635/km²
people per km²
Founded
1870

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 69°F through the month.

A typical September day in Newport Beach reaches about 69°F in the afternoon and slips back to 65°F overnight — a 4°F spread between the day's warmth and the night's chill. On most days the high lands between 65°F and 73°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)
17066
27066
37066
47066
57066
67066
77066
87066
96966
106966
116966
126966
136965
146965
156965
166965
176965
186965
196965
206965
216965
226965
236965
246965
256965
266965
276965
286965
296965
306965

Newport 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
Jan60° / 54°2.65.4105.4
Feb59° / 54°2.86.110.85.2
Mar60° / 55°1.6511.75.5
Apr61° / 57°0.62.212.86.2
May62° / 59°0.31.413.76.8
Jun65° / 61°0.00.214.27.8
Jul68° / 65°0.00.3148.4
Aug69° / 66°0.00.113.28.8
Sep69° / 65°0.10.512.28.6
Oct67° / 63°0.51.911.28.0
Nov64° / 59°0.72.510.37.2
Dec60° / 55°1.94.99.85.7

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 79% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 11% of September, with mostly cloudy or overcast conditions the remaining 10%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1928
2919
3919
4919
5919
6919
7919
8919
9919
10919
11919
12919
13919
14919
15919
16919
17919
18919
199010
209010
219010
228911
238911
248911
258911
268812
278812
288812
298812
308812

Chance of precipitation in September

Any precipitation

Newport Beach 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
81
91
101
111
121
131
142
152
162
172
182
192
202
212
222
232
243
253
263
273
283
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 55% of days. Sticky, muggy-or-worse air turns up on roughly 18% of them.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)Oppressive (%)
101560241
201658251
301757251
401856251
501956241
602055241
702155231
802156221
902255221
1002355211
1102455201
1212554191
1312555181
1412655171
1512755161
1612756151
1712856150
1812857140
1912857140
2012858130
2122857130
2222956130
2322956130
2422956130
2523055130
2633153130
2733253120
2843351120
2943450120
3053549110

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
196calm
206calm
216calm
226calm
236calm
246calm
256calm
266calm
276calm
286calm
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 5:29 AM to 5:50 AM, and sunset from 6:13 PM to 5:32 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.75:296:13
212.75:306:12
312.75:316:11
412.65:326:09
512.65:326:08
612.65:336:06
712.55:346:05
812.55:346:04
912.55:356:02
1012.45:366:01
1112.45:365:59
1212.35:375:58
1312.35:385:57
1412.35:385:55
1512.25:395:54
1612.25:405:52
1712.25:415:51
1812.15:415:49
1912.15:425:48
2012.15:435:46
2112.05:435:45
2212.05:445:44
2312.05:455:42
2411.95:465:41
2511.95:465:39
2611.85:475:38
2711.85:485:36
2811.85:485:35
2911.75:495:34
3011.75:505:32

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.09 kWh/m².

For context, solar energy here swings from a low near 3.02 kWh/m² to a high of 7.78 kWh/m² in June across the year — September's 6.09 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.7Intense
26.7Intense
36.6Intense
46.6Intense
56.5Intense
66.5Intense
76.5Intense
86.4Intense
96.4Intense
106.3Intense
116.3Intense
126.2Intense
136.2Intense
146.2Intense
156.1Intense
166.1Intense
176.0Intense
186.0Bright
196.0Bright
205.9Bright
215.9Bright
225.8Bright
235.8Bright
245.7Bright
255.7Bright
265.6Bright
275.6Bright
285.5Bright
295.5Bright
305.5Bright
Planning a trip in September

Is September a good time to visit Newport Beach?

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

8.6
Sightseeing
2nd-best month of the year
5.0
Beach & pool
2nd-best month of the year

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

What to pack for Newport Beach in September

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

In September, Newport Beach sees daytime highs around 69°F and nights near 65°F. Pack sun protection.

sun protection

Sea temperature near Newport Beach 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 offshore is warmest in August at about 69°F and coldest in February near 59°F.

It's comfortable for a long swim from Jul 13 to Sep 28 — about 2.6 months when the water holds above 68°F.

60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°F)Comfort
Jan59Cool
Feb59Cool
Mar59Cool
Apr60Cool
May63Cool
Jun65Cool
Jul68Refreshing
Aug69Refreshing
Sep69Refreshing
Oct67Cool
Nov64Cool
Dec60Cool

UV index in Newport 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 Newport Beach peaks around June 23 at about 10 (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 10Dec 17UV 3
UV index (midday)Level
Jan3Moderate
Feb5Moderate
Mar5Moderate
Apr7Very high
May8Very high
Jun10Extreme
Jul10Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Newport 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 Newport Beach is worst in September — around 49 µg/m³ PM2.5 (poor), about 4.0× the cleanest month (May, 12 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateSep 1447 µg/m³May 1713 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb19Moderate
Mar19Moderate
Apr17Moderate
May12Moderate
Jun17Moderate
Jul19Moderate
Aug32Moderate
Sep49Poor
Oct21Moderate
Nov21Moderate
Dec18Moderate
Location & terrain

Where is Newport Beach?

Newport Beach sits at 33.6°N, 117.9°W, 10 ft above sea level, in United States. The nearest listed city is Costa Mesa, 1.9 mi away.

Topography around Newport Beach

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

Within 2 miles, the terrain around Newport Beach has only modest variations in elevation — a maximum elevation change of 125 ft around an average of 36 ft above sea level; within 10 miles, significant variations in elevation — a maximum elevation change of 1,168 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,013 ft.

The land around Newport Beach is covered by artificial surfaces (44%) and water (44%) within 2 miles, water (51%) and artificial surfaces (34%) within 10 miles, and water (44%) and artificial surfaces (25%) within 50 miles.

2 miles
125 ft
10 miles
1,168 ft
50 miles
10,013 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Costa Mesa 1.9 mi · Huntington Beach 5.0 mi · UC Irvine 5.0 mi · Fountain Valley 6.2 mi · Irvine 6.8 mi · Westpark 8.1 mi · Tustin Legacy 8.1 mi · Woodbridge 8.7 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 Newport Beach (33.6189°, -117.929°, elevation 10 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).