Arroyo Grande weather in October

In October, Arroyo Grande sees average daytime highs of 68°F and overnight lows near 56°F, with 0.8 in of rain across 1.8 wet days and about 11.1 hours of daylight. It is the 4th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 70°F in the first days to 66°F by the end. The sky is clear or mostly clear about 76% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 42 min at the start of October to 10 h 36 min by month's end. Set against the rest of the year, October is Arroyo Grande's 3rd-clearest and 9th-windiest month. For the whole year in context, see Arroyo Grande's year-round climate.

Daytime high
68°
4th warmest
Overnight low
56°
9th coldest
Rainfall
0.8 in
1.8 wet days
Daylight
11 h 06 min
6:14 AM – 5:20 PM
Cloud cover
23%
3rd clearest
Wind
7 mph
9th windiest
Solar energy
4.77 kWh/m²
Travel score
8.3
out of 10

Arroyo Grande is city in San Luis Obispo County, California, United States.

Density
1,199/km²
people per km²
Founded
1862

Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 70°F in the first days to 66°F by the end.

A typical October day in Arroyo Grande reaches about 68°F in the afternoon and slips back to 56°F overnight — a 12°F spread between the day's warmth and the night's chill. On most days the high lands between 62°F and 76°F. Set against its neighbours, October runs about 2°F cooler than September and about 5°F warmer than November.

40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
17058
27058
37057
46957
56957
66957
76957
86957
96957
106957
116956
126956
136956
146956
156956
166956
176856
186856
196856
206856
216855
226855
236855
246755
256755
266755
276754
286754
296754
306654
316654

Arroyo Grande weather by month

How October compares with the rest of the year at a glance. October is the 4th-warmest and 7th-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 October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 76% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 10% of October, with mostly cloudy or overcast conditions the remaining 14%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1919
2919
3919
4919
59010
69010
79010
88911
98911
108911
118812
128713
138713
148614
158614
168614
178515
188515
198416
208416
218416
228317
238317
248317
258317
268317
278218
288218
298119
308020
318020

Chance of precipitation in October

Any precipitation

Arroyo Grande gets around 0.8 in of rain over 1.8 wet days in October. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 6% and peaks near 10% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
13
23
33
43
53
64
74
84
94
104
115
125
135
145
155
165
175
185
196
206
216
227
237
247
257
268
278
288
299
309
3110

Humidity in October

DryComfortableHumidMuggyOppressiveMiserable

Most of October feels dry — the stacked bands show each day's mix of comfort levels, read off the dew point.

By dew point, October lands in the dry band about 77% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
156431
258411
360391
462371
564351
666331
767321
869301
970291
1070282
1171272
1272262
1373252
1474242
1575232
1676222
1777212
1878202
1979192
2080182
2181172
2284151
2385141
2486131
2587121
2689110
279190
289280
299370
309370
319460

Wind in October

Winds average 7 mph in October.

Across October, 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.

0246810151015202531
Wind speed (mph)Feels
16calm
26calm
36calm
46calm
56calm
67calm
77calm
87calm
96calm
106calm
116calm
126calm
136calm
146calm
156calm
166calm
176calm
186calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 42 min at the start of October to 10 h 36 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 66 minutes over October. Sunrise moves from 6:02 AM to 6:28 AM, and sunset from 5:41 PM to 5:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.76:025:41
211.66:035:39
311.66:035:38
411.56:045:37
511.56:055:35
611.56:065:34
711.46:075:32
811.46:085:31
911.46:085:30
1011.36:095:28
1111.36:105:27
1211.26:115:26
1311.26:125:24
1411.26:135:23
1511.16:145:22
1611.16:145:20
1711.16:155:19
1811.06:165:18
1911.06:175:17
2011.06:185:15
2110.96:195:14
2210.96:205:13
2310.96:215:12
2410.86:225:11
2510.86:235:10
2610.86:245:09
2710.76:255:08
2810.76:255:06
2910.76:265:05
3010.66:275:04
3110.66:285:04

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 4.77 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 — October's 4.77 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.4Bright
45.4Bright
55.3Bright
65.3Bright
75.2Bright
85.2Bright
95.1Bright
105.1Bright
115.0Bright
125.0Bright
134.9Bright
144.9Bright
154.8Bright
164.8Bright
174.7Bright
184.7Bright
194.6Bright
204.6Bright
214.5Bright
224.5Bright
234.4Bright
244.4Bright
254.3Bright
264.3Bright
274.2Bright
284.2Bright
294.1Bright
304.1Bright
314.0Bright
Planning a trip in October

Is October a good time to visit Arroyo Grande?

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

8.3
Sightseeing
4th-best month of the year
4.4
Beach & pool
4th-best month of the year

October is one of the better times to visit Arroyo Grande for general sightseeing.

What to pack for Arroyo Grande in October

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

In October, Arroyo Grande sees daytime highs around 68°F and nights near 56°F. Worth packing: sun protection.

sun protection

Sea temperature near Arroyo Grande in October

The nearest coast averages about 60°F in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea offshore 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 Arroyo Grande in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 6 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Arroyo Grande 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 Arroyo Grande in October

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where October falls, not just the annual average.

Air quality in Arroyo Grande 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 Arroyo Grande?

Arroyo Grande sits at 35.1°N, 120.6°W, 118 ft above sea level, in United States. The nearest listed city is Nipomo, 8.1 mi away.

Topography around Arroyo Grande

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

Within 2 miles, the terrain around Arroyo Grande has only modest variations in elevation — a maximum elevation change of 486 ft around an average of 151 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,808 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,715 ft.

The land around Arroyo Grande is covered by artificial surfaces (48%) and grassland (21%) within 2 miles, grassland (32%), water (25%) and trees (23%) within 10 miles, and grassland (47%) and water (27%) within 50 miles.

2 miles
486 ft
10 miles
2,808 ft
50 miles
5,715 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Nipomo 8.1 mi · San Luis Obispo 12 mi · Santa Maria 14 mi · Orcutt 19 mi · Atascadero 26 mi · Lompoc 34 mi · Paso Robles 35 mi · Isla Vista 64 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 Arroyo Grande (35.1186°, -120.5907°, elevation 118 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).