Vacaville weather in October

In October, Vacaville sees average daytime highs of 77°F and overnight lows near 53°F, with 0.9 in of rain across 2.7 wet days and about 11 hours of daylight. It is the 6th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 80°F in the first days to 72°F by the end. The sky is clear or mostly clear about 69% of the time in October, and the air most often feels dry.

Daylight stretches from about 11 h 36 min at the start of October to 10 h 24 min by month's end. Set against the rest of the year, October is Vacaville's 5th-clearest and 9th-windiest month. For the whole year in context, see Vacaville's year-round climate.

Daytime high
77°
6th warmest
Overnight low
53°
7th coldest
Rainfall
0.9 in
2.7 wet days
Daylight
11 hours
6:23 AM – 5:23 PM
Cloud cover
28%
5th clearest
Wind
5 mph
9th windiest
Solar energy
4.24 kWh/m²
Travel score
8.5
out of 10

Vacaville is city in Solano County, California, United States of America.

Density
1,308/km²
people per km²
Founded
1852

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 80°F in the first days to 72°F by the end.

A typical October day in Vacaville reaches about 77°F in the afternoon and slips back to 53°F overnight — a 24°F spread between the day's warmth and the night's chill. On most days the high lands between 67°F and 86°F. Set against its neighbours, October runs about 7°F cooler than September and about 12°F warmer than November.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
18155
28155
38055
48055
58055
68054
77954
87954
97954
107954
117854
127854
137853
147853
157753
167753
177753
187653
197653
207653
217552
227552
237452
247452
257451
267351
277351
287351
297251
307250
317150

Vacaville weather by month

How October compares with the rest of the year at a glance. October is the 6th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan58° / 42°4.39.29.64.3
Feb62° / 44°4.2910.55.2
Mar66° / 46°3.18.211.76.4
Apr71° / 49°1.34.8137.5
May77° / 53°0.73.214.18.4
Jun83° / 57°0.20.914.67.7
Jul85° / 58°0.00.114.47.1
Aug85° / 58°0.00.213.57.1
Sep84° / 57°0.10.412.37.7
Oct77° / 53°0.92.7118.5
Nov65° / 47°2.05.89.96.6
Dec58° / 42°3.999.44.3

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 69% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 11% of October, with mostly cloudy or overcast conditions the remaining 20%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
18812
28713
38713
48614
58515
68515
78416
88416
98317
108218
118119
128119
138119
148020
158020
168020
177921
187921
197921
207822
217822
227822
237723
247723
257723
267624
277624
287525
297426
307327
317228

Chance of precipitation in October

Any precipitation

Vacaville gets around 0.9 in of rain over 2.7 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 8% and peaks near 15% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
14
24
35
45
55
65
75
86
96
106
116
126
136
146
156
167
177
187
198
209
219
2210
2310
2411
2512
2612
2713
2813
2913
3014
3115

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 90% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
184151
284151
385141
486131
586131
687121
787121
888111
988111
1088111
1189101
1289101
1389101
1489101
1589101
169091
179091
189091
199091
209091
219091
229181
239181
249280
259370
269370
279370
289460
299460
309460
319460

Wind in October

Winds average 5 mph in October.

Across October, daily wind ranges from about 5 mph on the calmest days to 5 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
15calm
25calm
35calm
45calm
55calm
65calm
75calm
85calm
95calm
105calm
115calm
125calm
135calm
145calm
155calm
165calm
175calm
185calm
195calm
205calm
215calm
225calm
235calm
245calm
255calm
265calm
275calm
285calm
295calm
305calm
315calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 72 minutes over October. Sunrise moves from 6:09 AM to 6:39 AM, and sunset from 5:45 PM to 5:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:095:45
211.66:105:44
311.56:115:42
411.56:125:40
511.46:135:39
611.46:135:37
711.46:145:36
811.36:155:34
911.36:165:33
1011.26:175:31
1111.26:185:30
1211.16:195:28
1311.16:205:27
1411.16:215:25
1511.06:225:24
1611.06:235:23
1710.96:245:21
1810.96:255:20
1910.96:275:18
2010.86:285:17
2110.86:295:16
2210.76:305:14
2310.76:315:13
2410.76:325:12
2510.66:335:11
2610.66:345:09
2710.66:355:08
2810.56:365:07
2910.56:375:06
3010.46:385:05
3110.46:395:04

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 4.24 kWh/m².

For context, solar energy here swings from a low near 2.09 kWh/m² to a high of 8.13 kWh/m² in July across the year — October's 4.24 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.1Bright
25.1Bright
35.0Bright
44.9Bright
54.9Bright
64.8Bright
74.8Bright
84.7Bright
94.7Bright
104.6Bright
114.5Bright
124.5Bright
134.4Bright
144.4Bright
154.3Bright
164.3Bright
174.2Bright
184.1Bright
194.1Bright
204.0Bright
214.0Moderate
223.9Moderate
233.9Moderate
243.8Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.6Moderate
293.5Moderate
303.5Moderate
313.4Moderate
Planning a trip in October

Hazard calendar for Vacaville

In seasonPeak

None of Vacaville's seasonal hazards are active in October. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.

Vacaville's rainy season runs November–March, when most of the year's rain falls.

Rainy season
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec

Is October a good time to visit Vacaville?

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

8.5
Sightseeing
1st-best month of the year
7.4
Beach & pool
6th-best month of the year

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

What to pack for Vacaville in October

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

In October, Vacaville sees daytime highs around 77°F and nights near 53°F. Worth packing: light clothes.

light clothes

UV index in Vacaville in October

LowModerateHighVery highExtreme

Clear-sky midday UV in October peaks around 5 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Vacaville peaks around June 23 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 13 at about 2 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 9 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highHighModerateJun 23UV 10Dec 13UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Very high
Jul10Very high
Aug9Very high
Sep6High
Oct5Moderate
Nov2Moderate
Dec2Low

Air quality in Vacaville 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 Vacaville is worst in September — around 29 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (June, 7 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateSep 1829 µg/m³Jun 127 µg/m³
PM2.5 (µg/m³)Level
Jan13Moderate
Feb13Moderate
Mar13Moderate
Apr10Good
May8Good
Jun7Good
Jul10Good
Aug25Moderate
Sep29Moderate
Oct27Moderate
Nov16Moderate
Dec12Good
Location & terrain

Where is Vacaville?

Vacaville sits at 38.4°N, 122.0°W, 174 ft above sea level, in United States. The nearest listed city is Fairfield, 8.1 mi away.

Topography around Vacaville

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

Within 2 miles, the terrain around Vacaville has only modest variations in elevation — a maximum elevation change of 564 ft around an average of 210 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,825 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,459 ft.

The land around Vacaville is covered by artificial surfaces (47%), grassland (25%) and trees (23%) within 2 miles, grassland (41%), trees (25%) and cropland (20%) within 10 miles, and grassland (33%), trees (26%) and cropland (22%) within 50 miles.

2 miles
564 ft
10 miles
2,825 ft
50 miles
4,459 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
October weather nearby: Fairfield 8.1 mi · Suisun 8.7 mi · Dixon 11 mi · Napa 17 mi · Davis 19 mi · American Canyon 19 mi · Bay Point 22 mi · Vallejo 23 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 Vacaville (38.3566°, -121.9877°, elevation 174 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. 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).