Ventura weather in September

In September, Ventura sees average daytime highs of 74°F and overnight lows near 63°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 74°F through the month. The sky is clear or mostly clear about 86% of the time in September, and the air most often feels comfortable.

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 Ventura's 2nd-clearest and 11th-windiest month. For the whole year in context, see Ventura's year-round climate.

Daytime high
74°
2nd warmest
Overnight low
63°
10th coldest
Rainfall
0.1 in
0.5 wet days
Daylight
12 h 12 min
5:45 AM – 5:58 PM
Cloud cover
18%
2nd clearest
Wind
4 mph
11th windiest
Solar energy
6.16 kWh/m²
Travel score
9.3
out of 10

Ventura is city in and county seat of Ventura County, California, United States.

Density
1,164/km²
people per km²
Founded
1782

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 74°F through the month.

A typical September day in Ventura reaches about 74°F in the afternoon and slips back to 63°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 69°F and 81°F. Set against its neighbours, September runs on par with August and about 3°F warmer than October.

50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17664
27664
37564
47564
57564
67564
77564
87563
97563
107463
117463
127463
137463
147463
157462
167462
177462
187462
197462
207462
217462
227462
237462
247462
257462
267462
277462
287461
297361
307361

Ventura 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° / 49°3.75.6105.9
Feb61° / 49°3.76.110.75.7
Mar62° / 51°2.65.111.76.3
Apr65° / 52°0.92.812.87.3
May67° / 56°0.41.513.87.9
Jun70° / 59°0.10.314.28.7
Jul74° / 63°0.10.414.19.3
Aug75° / 64°0.00.113.39.6
Sep74° / 63°0.10.512.29.3
Oct71° / 59°0.7211.18.5
Nov66° / 54°0.92.810.27.6
Dec61° / 49°2.34.99.86.1

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 86% of the time in September.

Beyond those clear spells, partly cloudy skies cover about 7% of September, with mostly cloudy or overcast conditions the remaining 7%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1955
2955
3955
4955
5955
6955
7955
8955
9955
10955
11946
12946
13937
14937
15937
16937
17937
18937
19928
20928
21928
22928
23928
24928
25919
26919
27919
28919
29919
30919

Chance of precipitation in September

Any precipitation

Ventura 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
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 comfortable — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, September lands in the comfortable band about 51% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)Muggy (%)
1139537
2140527
3241507
4242497
5243486
6345476
7346456
8347445
9448435
10450424
11551404
12652393
13653383
14754372
15854362
16854362
17954352
181055341
191055341
201155331
211254331
221354321
231355311
241455301
251556290
261755280
271856260
282056240
292156230
302356210

Wind in September

Winds average 4 mph in September.

Across September, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm

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 5:34 AM to 5:56 AM, and sunset from 6:19 PM to 5:37 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:346:19
212.75:356:18
312.75:366:17
412.65:376:15
512.65:376:14
612.65:386:12
712.55:396:11
812.55:396:09
912.55:406:08
1012.45:416:07
1112.45:426:05
1212.45:426:04
1312.35:436:02
1412.35:446:01
1512.25:445:59
1612.25:455:58
1712.25:465:56
1812.15:475:55
1912.15:475:53
2012.15:485:52
2112.05:495:50
2212.05:505:49
2312.05:505:48
2411.95:515:46
2511.95:525:45
2611.85:535:43
2711.85:535:42
2811.85:545:40
2911.75:555:39
3011.75:565:37

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 2.96 kWh/m² to a high of 8.05 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
46.6Intense
56.6Intense
66.5Intense
76.5Intense
86.5Intense
96.4Intense
106.4Intense
116.4Intense
126.3Intense
136.3Intense
146.3Intense
156.2Intense
166.2Intense
176.1Intense
186.1Intense
196.0Intense
206.0Intense
216.0Bright
225.9Bright
235.9Bright
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 Ventura?

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

9.3
Sightseeing
2nd-best month of the year
7.5
Beach & pool
2nd-best month of the year

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

What to pack for Ventura in September

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

In September, Ventura sees daytime highs around 74°F and nights near 63°F. Pack sun protection. Worth having: light clothes.

sun protectionlight clothes

Sea temperature near Ventura in September

The nearest coast averages about 66°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 8 mi away) is warmest in August at about 66°F and coldest in April near 57°F.

The water stays below 68°F all year — cool enough that most swimmers want a wetsuit.

55°60°65°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan58Bracing
Feb58Bracing
Mar57Bracing
Apr57Bracing
May59Bracing
Jun62Cool
Jul65Cool
Aug66Cool
Sep66Cool
Oct65Cool
Nov62Cool
Dec59Cool

UV index in Ventura 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 Ventura peaks around June 23 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 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 15UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr7Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Ventura 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 Ventura is worst in December — around 78 µg/m³ PM2.5 (unhealthy), about 12.6× the cleanest month (January, 6 µg/m³).

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

020406080JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateUnhealthyDec 1670 µg/m³Jan 246 µg/m³
PM2.5 (µg/m³)Level
Jan6Good
Feb7Good
Mar8Good
Apr7Good
May7Good
Jun7Good
Jul11Good
Aug12Good
Sep11Good
Oct8Good
Nov14Moderate
Dec78Unhealthy
Location & terrain

Where is Ventura?

Ventura sits at 34.3°N, 119.3°W, 36 ft above sea level, in United States. The nearest listed city is Oxnard, 8.7 mi away.

Topography around Ventura

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

Within 2 miles, the terrain around Ventura has significant variations in elevation — a maximum elevation change of 1,145 ft around an average of 141 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,605 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 8,806 ft.

The land around Ventura is covered by water (37%) and artificial surfaces (28%) within 2 miles, water (41%) and grassland (23%) within 10 miles, and water (43%), grassland (22%) and trees (21%) within 50 miles.

2 miles
1,145 ft
10 miles
2,605 ft
50 miles
8,806 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Oxnard 8.7 mi · Port Hueneme 11 mi · Santa Paula 14 mi · Camarillo 15 mi · Fillmore 23 mi · Moorpark 24 mi · Santa Barbara 25 mi · Thousand Oaks 27 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 Ventura (34.2783°, -119.2932°, elevation 36 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).