Nipomo weather in September

In September, Nipomo sees average daytime highs of 70°F and overnight lows near 59°F, with 0.0 in of rain across 0.4 wet days and about 12.2 hours of daylight. It is the 1st-warmest and 10th-wettest month of the year here.

Day-to-day highs hold fairly steady near 70°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 Nipomo's 1st-clearest and 12th-windiest month. For the whole year in context, see Nipomo's year-round climate.

Daytime high
70°
1st warmest
Overnight low
59°
11th coldest
Rainfall
0.0 in
0.4 wet days
Daylight
12 h 12 min
5:50 AM – 6:03 PM
Cloud cover
19%
1st clearest
Wind
6 mph
12th windiest
Solar energy
6.2 kWh/m²
Travel score
8.7
out of 10

Nipomo is census-designated place in San Luis Obispo County, California, United States.

Density
435/km²
people per km²

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 70°F through the month.

A typical September day in Nipomo reaches about 70°F in the afternoon and slips back to 59°F overnight — a 11°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 76°F. Set against its neighbours, September runs on par with August and about 2°F warmer than October.

50°60°70°80°151015202530
Avg high (°F)Avg low (°F)
17060
27060
37059
47059
57059
67059
77059
87059
97059
107059
117059
127059
137059
147059
157059
167058
177058
187058
197058
207058
217058
227058
237058
247058
257058
267058
277058
287058
297058
307058

Nipomo weather by month

How September compares with the rest of the year at a glance. September is the 1st-warmest and 10th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan59° / 47°3.87.29.95.1
Feb59° / 48°3.67.810.74.9
Mar60° / 49°2.86.311.75.5
Apr62° / 50°1.03.312.96.4
May64° / 53°0.41.613.87.3
Jun66° / 56°0.10.414.38.2
Jul69° / 59°0.00.214.18.5
Aug70° / 59°0.00.113.38.8
Sep70° / 59°0.00.412.28.7
Oct68° / 56°0.81.811.18.3
Nov64° / 51°1.43.710.26.9
Dec59° / 47°2.86.19.75.2

Cloud cover in September

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 86% of the time in September, the clearest month of the year.

Beyond those clear spells, partly cloudy skies cover about 8% of September, with mostly cloudy or overcast conditions the remaining 7%.

0%25%50%75%100%151015202530
Clearer (%)Cloudier (%)
1955
2955
3955
4955
5946
6946
7946
8946
9946
10946
11955
12955
13955
14946
15946
16946
17937
18937
19937
20937
21937
22937
23937
24928
25928
26928
27928
28928
29919
30919

Chance of precipitation in September

Any precipitation

Nipomo gets around 0.0 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 2% and peaks near 3% on the wettest days.

0%10%20%30%151015202530
Rain chance (%)
10
20
31
41
51
61
71
81
91
101
111
121
131
141
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 55% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202530
Dry (%)Comfortable (%)Humid (%)
128639
229629
330619
431609
532599
633598
734588
835587
936577
1038566
1138575
1239574
1340564
1440573
1540573
1641563
1741572
1842562
1942562
2043552
2143552
2244551
2345541
2446531
2547521
2648511
2749501
2851481
2952471
3054451

Wind in September

Winds average 6 mph in September, the calmest month.

Across September, daily wind ranges from about 6 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
306calm

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 5:38 AM to 6:01 AM, and sunset from 6:25 PM to 5:42 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202530
Daylight (h)Sunrise (AM)Sunset (PM)
112.85:386:25
212.75:396:23
312.75:406:22
412.75:416:21
512.65:416:19
612.65:426:18
712.65:436:16
812.55:446:15
912.55:446:13
1012.45:456:12
1112.45:466:10
1212.45:476:09
1312.35:476:07
1412.35:486:06
1512.35:496:04
1612.25:506:03
1712.25:506:01
1812.15:516:00
1912.15:525:58
2012.15:535:57
2112.05:545:55
2212.05:545:54
2312.05:555:52
2411.95:565:51
2511.95:575:49
2611.85:575:48
2711.85:585:46
2811.85:595:45
2911.76:005:43
3011.76:015:42

Solar energy in September

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in September, about 6.2 kWh/m².

For context, solar energy here swings from a low near 2.84 kWh/m² to a high of 8.24 kWh/m² in June across the year — September's 6.2 kWh/m² falls in the middle.

0246151015202530
Solar energy (kWh/m²)Level
16.8Intense
26.8Intense
36.7Intense
46.7Intense
56.7Intense
66.6Intense
76.6Intense
86.5Intense
96.5Intense
106.5Intense
116.4Intense
126.4Intense
136.3Intense
146.3Intense
156.2Intense
166.2Intense
176.2Intense
186.1Intense
196.1Intense
206.0Intense
216.0Bright
225.9Bright
235.9Bright
245.8Bright
255.8Bright
265.7Bright
275.7Bright
285.7Bright
295.6Bright
305.6Bright
Planning a trip in September

Is September a good time to visit Nipomo?

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

8.7
Sightseeing
2nd-best month of the year
5.3
Beach & pool
2nd-best month of the year

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

What to pack for Nipomo in September

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

In September, Nipomo sees daytime highs around 70°F and nights near 59°F. Pack sun protection.

sun protection

Sea temperature near Nipomo in September

The nearest coast averages about 60°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 10 mi away) is warmest in September at about 60°F and coldest in April near 54°F.

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

52°54°56°58°60°62°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan56Bracing
Feb56Bracing
Mar55Bracing
Apr54Bracing
May54Bracing
Jun55Bracing
Jul58Bracing
Aug59Cool
Sep60Cool
Oct60Cool
Nov58Bracing
Dec57Bracing

UV index in Nipomo 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 Nipomo peaks around June 21 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 21UV 11Dec 15UV 3
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar5Moderate
Apr7Very high
May8Very high
Jun11Extreme
Jul10Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Nipomo 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 Nipomo is worst in August — around 19 µg/m³ PM2.5 (moderate), about 4.5× the cleanest month (June, 4 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 2218 µg/m³Jun 124 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb6Good
Mar7Good
Apr6Good
May5Good
Jun4Good
Jul7Good
Aug19Moderate
Sep17Moderate
Oct7Good
Nov6Good
Dec5Good
Location & terrain

Where is Nipomo?

Nipomo sits at 35.0°N, 120.5°W, 331 ft above sea level, in United States. The nearest listed city is Santa Maria, 6.8 mi away.

Topography around Nipomo

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

Within 2 miles, the terrain around Nipomo has only modest variations in elevation — a maximum elevation change of 656 ft around an average of 407 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,073 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,545 ft.

The land around Nipomo is covered by grassland (52%) within 2 miles, grassland (37%), trees (23%) and cropland (21%) within 10 miles, and grassland (46%) and water (27%) within 50 miles.

2 miles
656 ft
10 miles
2,073 ft
50 miles
6,545 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
September weather nearby: Santa Maria 6.8 mi · Arroyo Grande 8.1 mi · Orcutt 12 mi · San Luis Obispo 19 mi · Lompoc 28 mi · Atascadero 33 mi · Paso Robles 42 mi · Isla Vista 56 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 Nipomo (35.0427°, -120.476°, elevation 331 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).