Fillmore weather in September

In September, Fillmore sees average daytime highs of 81°F and overnight lows near 59°F, with 0.2 in of rain across 0.9 wet days and about 12.2 hours of daylight. It is the 3rd-warmest and 9th-wettest month of the year here.

Highs ease over the month, from about 84°F in the first days to 79°F by the end. The sky is clear or mostly clear about 86% 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 Fillmore's 2nd-clearest and 9th-windiest month. For the whole year in context, see Fillmore's year-round climate.

Daytime high
81°
3rd warmest
Overnight low
59°
10th coldest
Rainfall
0.2 in
0.9 wet days
Daylight
12 h 12 min
5:44 AM – 5:56 PM
Cloud cover
15%
2nd clearest
Wind
3 mph
9th windiest
Solar energy
6.33 kWh/m²
Travel score
8.5
out of 10

Fillmore is city in Ventura County, California, United States.

Density
1,784/km²
people per km²
Founded
1914

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 84°F in the first days to 79°F by the end.

A typical September day in Fillmore reaches about 81°F in the afternoon and slips back to 59°F overnight — a 22°F spread between the day's warmth and the night's chill. On most days the high lands between 73°F and 89°F. Set against its neighbours, September runs about 3°F cooler than August and about 7°F warmer than October.

40°60°80°151015202530
Avg high (°F)Avg low (°F)
18462
28462
38462
48362
58361
68361
78361
88361
98260
108260
118260
128260
138259
148159
158159
168159
178158
188158
198058
208058
218058
228058
238058
248057
258057
268057
277957
287956
297956
307956

Fillmore weather by month

How September compares with the rest of the year at a glance. September is the 3rd-warmest and 9th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan58° / 40°3.35.81.8105.0
Feb59° / 40°3.671.910.74.9
Mar62° / 42°2.76.21.411.76.1
Apr67° / 45°1.03.70.712.87.5
May72° / 51°0.62.8013.88.4
Jun79° / 57°0.10.7014.39.0
Jul84° / 62°0.21014.17.6
Aug85° / 63°0.00.2013.37.4
Sep81° / 59°0.20.9012.28.5
Oct74° / 52°0.72.8011.18.7
Nov65° / 45°0.82.90.310.27.3
Dec58° / 40°2.251.19.75.1

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 6% 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
3946
4946
5946
6946
7946
8946
9946
10946
11946
12946
13946
14946
15946
16946
17937
18937
19937
20937
21928
22919
23919
24919
25919
26919
27919
28919
299010
309010

Chance of precipitation in September

Any precipitation

Fillmore gets around 0.2 in of rain over 0.9 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 3% and peaks near 5% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
12
22
32
42
52
63
73
83
93
103
113
123
133
143
153
163
173
183
193
203
214
224
234
244
254
264
275
285
295
305

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 93% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
186122
287112
387112
487112
588102
688102
78992
89082
99082
109172
119262
129352
139451
149541
159541
169541
179541
189541
199730
209730
219730
229730
239730
249730
259730
269730
279730
289730
299730
309730

Wind in September

Winds average 3 mph in September.

Across September, daily wind ranges from about 3 mph on the calmest days to 3 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202530
Wind speed (mph)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm

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 5:33 AM to 5:54 AM, and sunset from 6:18 PM to 5:36 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:336:18
212.75:336:17
312.75:346:15
412.65:356:14
512.65:366:12
612.65:366:11
712.55:376:10
812.55:386:08
912.55:396:07
1012.45:396:05
1112.45:406:04
1212.45:416:02
1312.35:416:01
1412.35:425:59
1512.25:435:58
1612.25:445:56
1712.25:445:55
1812.15:455:53
1912.15:465:52
2012.15:475:50
2112.05:475:49
2212.05:485:48
2312.05:495:46
2411.95:505:45
2511.95:505:43
2611.85:515:42
2711.85:525:40
2811.85:535:39
2911.75:535:37
3011.75:545:36

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.33 kWh/m².

For context, solar energy here swings from a low near 2.97 kWh/m² to a high of 8.34 kWh/m² in June across the year — September's 6.33 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.9Intense
26.8Intense
36.8Intense
46.8Intense
56.7Intense
66.7Intense
76.7Intense
86.6Intense
96.6Intense
106.6Intense
116.5Intense
126.5Intense
136.5Intense
146.4Intense
156.4Intense
166.3Intense
176.3Intense
186.3Intense
196.2Intense
206.2Intense
216.1Intense
226.1Intense
236.0Intense
246.0Bright
255.9Bright
265.9Bright
275.8Bright
285.8Bright
295.7Bright
305.7Bright
Planning a trip in September

Is September a good time to visit Fillmore?

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

8.5
Sightseeing
3rd-best month of the year
8.9
Beach & pool
3rd-best month of the year

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

What to pack for Fillmore in September

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

In September, Fillmore sees daytime highs around 81°F and nights near 59°F. Pack light clothes and sun protection.

light clothessun protection

Sea temperature near Fillmore in September

The nearest coast averages about 67°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 22 mi away) is warmest in August at about 67°F and coldest in March near 58°F.

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

55°60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan58Bracing
Feb58Bracing
Mar58Bracing
Apr58Bracing
May60Cool
Jun63Cool
Jul66Cool
Aug67Cool
Sep67Cool
Oct65Cool
Nov62Cool
Dec60Cool

UV index in Fillmore 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 Fillmore 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
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug11Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Fillmore 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 Fillmore 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 Fillmore?

Fillmore sits at 34.4°N, 118.9°W, 456 ft above sea level, in United States. The nearest listed city is Moorpark, 8.1 mi away.

Topography around Fillmore

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

Within 2 miles, the terrain around Fillmore has significant variations in elevation — a maximum elevation change of 1,506 ft around an average of 597 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,476 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 8,796 ft.

The land around Fillmore is covered by trees (30%) and grassland (22%) within 2 miles, trees (38%) and grassland (34%) within 10 miles, and grassland (29%), water (26%) and trees (20%) within 50 miles.

2 miles
1,506 ft
10 miles
5,476 ft
50 miles
8,796 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Moorpark 8.1 mi · Santa Paula 8.7 mi · Simi Valley 12 mi · Camarillo 14 mi · Thousand Oaks 16 mi · Valencia 18 mi · Castaic 18 mi · Stevenson Ranch 20 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 Fillmore (34.3992°, -118.9181°, elevation 456 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).