Brentwood weather in October

In October, Brentwood sees average daytime highs of 76°F and overnight lows near 54°F, with 0.9 in of rain across 2.8 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 79°F in the first days to 71°F by the end. The sky is clear or mostly clear about 68% 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 Brentwood's 5th-clearest and 8th-windiest month. For the whole year in context, see Brentwood's year-round climate.

Daytime high: 76°; 6th warmest
Overnight low: 54°; 7th coldest
Rainfall: 0.9 in; 2.8 wet days
Daylight: 11 hours; 6:22 AM – 5:22 PM
Cloud cover: 28%; 5th clearest
Wind: 5 mph; 8th windiest
Solar energy: 4.3 kWh/m²
Travel score: 8.6; out of 10

Brentwood is city in Contra Costa County, California, United States.

Density: 1,538/km²; people per km²
Founded: 1837

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

← September Brentwood year-round climate November →Best places to visit in October

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

Temperature in October

Average highAverage lowShaded bands: 10–90% of days

Highs ease over the month, from about 79°F in the first days to 71°F by the end.

A typical October day in Brentwood reaches about 76°F in the afternoon and slips back to 54°F overnight — a 22°F spread between the day's warmth and the night's chill. On most days the high lands between 68°F and 84°F. Set against its neighbours, October runs about 6°F cooler than September and about 11°F warmer than November.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Avg high (°F)	80	80	79	79	79	78	78	78	78	78	77	77	77	77	76	76	76	76	75	75	74	74	74	73	73	73	72	72	71	71	71
Avg low (°F)	56	56	56	55	55	55	55	55	55	55	55	54	54	54	54	54	54	53	53	53	53	53	53	52	52	52	52	51	51	51	51

	Avg high (°F)	Avg low (°F)
1	80	56
2	80	56
3	79	56
4	79	55
5	79	55
6	78	55
7	78	55
8	78	55
9	78	55
10	78	55
11	77	55
12	77	54
13	77	54
14	77	54
15	76	54
16	76	54
17	76	54
18	76	53
19	75	53
20	75	53
21	74	53
22	74	53
23	74	53
24	73	52
25	73	52
26	73	52
27	72	52
28	72	51
29	71	51
30	71	51
31	71	51

Brentwood 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.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Daylight (hours)	Travel score
Jan	57° / 43°	3.7	9	9.7	4.2
Feb	61° / 45°	3.5	8.8	10.5	5.2
Mar	66° / 48°	2.7	8.3	11.7	6.4
Apr	70° / 50°	1.2	4.7	13	7.6
May	76° / 54°	0.6	3	14	8.5
Jun	82° / 57°	0.1	0.7	14.6	8.3
Jul	84° / 59°	0.0	0.2	14.4	7.7
Aug	84° / 59°	0.1	0.2	13.5	7.7
Sep	82° / 58°	0.0	0.3	12.3	8.3
Oct	76° / 54°	0.9	2.8	11	8.6
Nov	65° / 47°	1.8	5.4	10	6.6
Dec	57° / 43°	3.4	8.4	9.4	4.3

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 68% 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.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Clearer (%)	88	88	86	86	85	85	84	83	83	82	82	80	80	80	80	79	79	79	78	78	78	78	77	77	77	75	75	74	74	72	71
Cloudier (%)	12	12	14	14	15	15	16	17	17	18	18	20	20	20	20	21	21	21	22	22	22	22	23	23	23	25	25	26	26	28	29

	Clearer (%)	Cloudier (%)
1	88	12
2	88	12
3	86	14
4	86	14
5	85	15
6	85	15
7	84	16
8	83	17
9	83	17
10	82	18
11	82	18
12	80	20
13	80	20
14	80	20
15	80	20
16	79	21
17	79	21
18	79	21
19	78	22
20	78	22
21	78	22
22	78	22
23	77	23
24	77	23
25	77	23
26	75	25
27	75	25
28	74	26
29	74	26
30	72	28
31	71	29

Chance of precipitation in October

Any precipitation

Brentwood gets around 0.9 in of rain over 2.8 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 8% and peaks near 13% on the wettest days. The odds climb toward the end of the month.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Rain chance (%)	4	5	5	5	6	6	6	6	7	7	7	7	7	7	7	7	7	8	8	9	9	10	10	11	11	11	12	12	13	13	13

	Rain chance (%)
1	4
2	5
3	5
4	5
5	6
6	6
7	6
8	6
9	7
10	7
11	7
12	7
13	7
14	7
15	7
16	7
17	7
18	8
19	8
20	9
21	9
22	10
23	10
24	11
25	11
26	11
27	12
28	12
29	13
30	13
31	13

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 85% of days. It rarely turns muggy — the humid and sticky bands barely register.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Dry (%)	75	76	77	78	79	80	81	82	83	84	84	85	85	85	85	86	86	86	87	87	87	88	88	88	89	89	91	91	91	91	92
Comfortable (%)	24	23	22	21	20	19	18	17	16	15	15	14	14	14	14	13	13	13	12	12	12	11	11	11	10	10	9	9	9	9	8
Humid (%)	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	1	0	0	0	0	0

	Dry (%)	Comfortable (%)	Humid (%)
1	75	24	1
2	76	23	1
3	77	22	1
4	78	21	1
5	79	20	1
6	80	19	1
7	81	18	1
8	82	17	1
9	83	16	1
10	84	15	1
11	84	15	1
12	85	14	1
13	85	14	1
14	85	14	1
15	85	14	1
16	86	13	1
17	86	13	1
18	86	13	1
19	87	12	1
20	87	12	1
21	87	12	1
22	88	11	1
23	88	11	1
24	88	11	1
25	89	10	1
26	89	10	1
27	91	9	0
28	91	9	0
29	91	9	0
30	91	9	0
31	92	8	0

Wind in October

Winds average 5 mph in October.

Across October, daily wind ranges from about 5 mph on the calmest days to 6 mph at its breeziest. It stays fairly steady from day to day.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Wind speed (mph)	6	6	6	6	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5
Feels	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (mph)	Feels
1	6	calm
2	6	calm
3	6	calm
4	6	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	calm
22	5	calm
23	5	calm
24	5	calm
25	5	calm
26	5	calm
27	5	calm
28	5	calm
29	5	calm
30	5	calm
31	5	calm

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 6:07 AM to 6:37 AM, and sunset from 5:44 PM to 5:03 PM.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Daylight (h)	11.6	11.6	11.5	11.5	11.4	11.4	11.4	11.3	11.3	11.2	11.2	11.2	11.1	11.1	11.0	11.0	11.0	10.9	10.9	10.8	10.8	10.8	10.7	10.7	10.7	10.6	10.6	10.5	10.5	10.5	10.4
Sunrise (AM)	6:07	6:08	6:09	6:10	6:11	6:12	6:13	6:14	6:15	6:16	6:17	6:18	6:19	6:20	6:21	6:22	6:23	6:24	6:25	6:26	6:27	6:28	6:29	6:30	6:31	6:32	6:33	6:34	6:35	6:36	6:37
Sunset (PM)	5:44	5:43	5:41	5:39	5:38	5:36	5:35	5:33	5:32	5:30	5:29	5:27	5:26	5:25	5:23	5:22	5:20	5:19	5:18	5:16	5:15	5:14	5:13	5:11	5:10	5:09	5:08	5:07	5:05	5:04	5:03

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.6	6:07	5:44
2	11.6	6:08	5:43
3	11.5	6:09	5:41
4	11.5	6:10	5:39
5	11.4	6:11	5:38
6	11.4	6:12	5:36
7	11.4	6:13	5:35
8	11.3	6:14	5:33
9	11.3	6:15	5:32
10	11.2	6:16	5:30
11	11.2	6:17	5:29
12	11.2	6:18	5:27
13	11.1	6:19	5:26
14	11.1	6:20	5:25
15	11.0	6:21	5:23
16	11.0	6:22	5:22
17	11.0	6:23	5:20
18	10.9	6:24	5:19
19	10.9	6:25	5:18
20	10.8	6:26	5:16
21	10.8	6:27	5:15
22	10.8	6:28	5:14
23	10.7	6:29	5:13
24	10.7	6:30	5:11
25	10.7	6:31	5:10
26	10.6	6:32	5:09
27	10.6	6:33	5:08
28	10.5	6:34	5:07
29	10.5	6:35	5:05
30	10.5	6:36	5:04
31	10.4	6:37	5:03

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 4.3 kWh/m².

For context, solar energy here swings from a low near 2.16 kWh/m² to a high of 8.13 kWh/m² in June across the year — October's 4.3 kWh/m² falls in the middle.

	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20	21	22	23	24	25	26	27	28	29	30	31
Solar energy (kWh/m²)	5.2	5.1	5.0	5.0	4.9	4.9	4.8	4.8	4.7	4.7	4.6	4.5	4.5	4.4	4.4	4.3	4.3	4.2	4.1	4.1	4.0	4.0	3.9	3.9	3.8	3.8	3.7	3.6	3.6	3.5	3.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	Solar energy (kWh/m²)	Level
1	5.2	Bright
2	5.1	Bright
3	5.0	Bright
4	5.0	Bright
5	4.9	Bright
6	4.9	Bright
7	4.8	Bright
8	4.8	Bright
9	4.7	Bright
10	4.7	Bright
11	4.6	Bright
12	4.5	Bright
13	4.5	Bright
14	4.4	Bright
15	4.4	Bright
16	4.3	Bright
17	4.3	Bright
18	4.2	Bright
19	4.1	Bright
20	4.1	Bright
21	4.0	Bright
22	4.0	Moderate
23	3.9	Moderate
24	3.9	Moderate
25	3.8	Moderate
26	3.8	Moderate
27	3.7	Moderate
28	3.6	Moderate
29	3.6	Moderate
30	3.5	Moderate
31	3.5	Moderate

Planning a trip in October

Is October a good time to visit Brentwood?

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

8.6

Sightseeing

1st-best month of the year

7.2

Beach & pool

6th-best month of the year

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

What to pack for Brentwood in October

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

In October, Brentwood sees daytime highs around 76°F and nights near 54°F. Worth packing: light clothes.

light clothes

UV index in Brentwood 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 Brentwood peaks around June 22 at about 10 (very high) — sunscreen, a hat and midday shade are essential. It bottoms out near December 15 at about 2 (moderate).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	2	4	4	6	8	10	10	10	6	5	2	2
Level	Moderate	Moderate	Moderate	High	Very high	Very high	Very high	Very high	High	High	Moderate	Low

	UV index (midday)	Level
Jan	2	Moderate
Feb	4	Moderate
Mar	4	Moderate
Apr	6	High
May	8	Very high
Jun	10	Very high
Jul	10	Very high
Aug	10	Very high
Sep	6	High
Oct	5	High
Nov	2	Moderate
Dec	2	Low

Air quality in Brentwood 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 Brentwood is worst in August — around 27 µg/m³ PM2.5 (moderate), about 3.6× the cleanest month (June, 8 µg/m³).

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
PM2.5 (µg/m³)	15	14	15	12	9	8	11	27	23	17	19	14
Level	Moderate	Moderate	Moderate	Good	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	15	Moderate
Feb	14	Moderate
Mar	15	Moderate
Apr	12	Good
May	9	Good
Jun	8	Good
Jul	11	Good
Aug	27	Moderate
Sep	23	Moderate
Oct	17	Moderate
Nov	19	Moderate
Dec	14	Moderate

Location & terrain

Where is Brentwood?

Brentwood sits at 37.9°N, 121.7°W, 79 ft above sea level, in United States. The nearest listed city is Oakley, 4.3 mi away.

Topography around Brentwood

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

Within 2 miles, the terrain around Brentwood has only modest variations in elevation — a maximum elevation change of 125 ft around an average of 75 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,490 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.

The land around Brentwood is covered by artificial surfaces (44%) and cropland (33%) within 2 miles, grassland (40%) and cropland (25%) within 10 miles, and grassland (35%) and trees (22%) within 50 miles.

2 miles

125 ft

artificial surfaces 44%

10 miles

2,490 ft

grassland 40%

50 miles

4,452 ft

grassland 35%

treesgrasslandcroplandartificial surfacesbare terrainwaterwetland

← September Brentwood year-round climate November →Best places to visit in October

October weather nearby: Oakley 4.3 mi · Antioch 8.1 mi · Pittsburg 12 mi · Bay Point 16 mi · Livermore 18 mi · Danville 18 mi · Concord 19 mi · San Ramon 19 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

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 Brentwood (37.9319°, -121.6958°, elevation 79 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).

	Avg high (°F)	Avg low (°F)
1	80	56
2	80	56
3	79	56
4	79	55
5	79	55
6	78	55
7	78	55
8	78	55
9	78	55
10	78	55
11	77	55
12	77	54
13	77	54
14	77	54
15	76	54
16	76	54
17	76	54
18	76	53
19	75	53
20	75	53
21	74	53
22	74	53
23	74	53
24	73	52
25	73	52
26	73	52
27	72	52
28	72	51
29	71	51
30	71	51
31	71	51

	Clearer (%)	Cloudier (%)
1	88	12
2	88	12
3	86	14
4	86	14
5	85	15
6	85	15
7	84	16
8	83	17
9	83	17
10	82	18
11	82	18
12	80	20
13	80	20
14	80	20
15	80	20
16	79	21
17	79	21
18	79	21
19	78	22
20	78	22
21	78	22
22	78	22
23	77	23
24	77	23
25	77	23
26	75	25
27	75	25
28	74	26
29	74	26
30	72	28
31	71	29

	Rain chance (%)
1	4
2	5
3	5
4	5
5	6
6	6
7	6
8	6
9	7
10	7
11	7
12	7
13	7
14	7
15	7
16	7
17	7
18	8
19	8
20	9
21	9
22	10
23	10
24	11
25	11
26	11
27	12
28	12
29	13
30	13
31	13

	Dry (%)	Comfortable (%)	Humid (%)
1	75	24	1
2	76	23	1
3	77	22	1
4	78	21	1
5	79	20	1
6	80	19	1
7	81	18	1
8	82	17	1
9	83	16	1
10	84	15	1
11	84	15	1
12	85	14	1
13	85	14	1
14	85	14	1
15	85	14	1
16	86	13	1
17	86	13	1
18	86	13	1
19	87	12	1
20	87	12	1
21	87	12	1
22	88	11	1
23	88	11	1
24	88	11	1
25	89	10	1
26	89	10	1
27	91	9	0
28	91	9	0
29	91	9	0
30	91	9	0
31	92	8	0

	Avg high (°F)	Avg low (°F)
1	80	56
2	80	56
3	79	56
4	79	55
5	79	55
6	78	55
7	78	55
8	78	55
9	78	55
10	78	55
11	77	55
12	77	54
13	77	54
14	77	54
15	76	54
16	76	54
17	76	54
18	76	53
19	75	53
20	75	53
21	74	53
22	74	53
23	74	53
24	73	52
25	73	52
26	73	52
27	72	52
28	72	51
29	71	51
30	71	51
31	71	51

	Clearer (%)	Cloudier (%)
1	88	12
2	88	12
3	86	14
4	86	14
5	85	15
6	85	15
7	84	16
8	83	17
9	83	17
10	82	18
11	82	18
12	80	20
13	80	20
14	80	20
15	80	20
16	79	21
17	79	21
18	79	21
19	78	22
20	78	22
21	78	22
22	78	22
23	77	23
24	77	23
25	77	23
26	75	25
27	75	25
28	74	26
29	74	26
30	72	28
31	71	29

	Rain chance (%)
1	4
2	5
3	5
4	5
5	6
6	6
7	6
8	6
9	7
10	7
11	7
12	7
13	7
14	7
15	7
16	7
17	7
18	8
19	8
20	9
21	9
22	10
23	10
24	11
25	11
26	11
27	12
28	12
29	13
30	13
31	13

	Dry (%)	Comfortable (%)	Humid (%)
1	75	24	1
2	76	23	1
3	77	22	1
4	78	21	1
5	79	20	1
6	80	19	1
7	81	18	1
8	82	17	1
9	83	16	1
10	84	15	1
11	84	15	1
12	85	14	1
13	85	14	1
14	85	14	1
15	85	14	1
16	86	13	1
17	86	13	1
18	86	13	1
19	87	12	1
20	87	12	1
21	87	12	1
22	88	11	1
23	88	11	1
24	88	11	1
25	89	10	1
26	89	10	1
27	91	9	0
28	91	9	0
29	91	9	0
30	91	9	0
31	92	8	0

	Avg high (°F)	Avg low (°F)
1	80	56
2	80	56
3	79	56
4	79	55
5	79	55
6	78	55
7	78	55
8	78	55
9	78	55
10	78	55
11	77	55
12	77	54
13	77	54
14	77	54
15	76	54
16	76	54
17	76	54
18	76	53
19	75	53
20	75	53
21	74	53
22	74	53
23	74	53
24	73	52
25	73	52
26	73	52
27	72	52
28	72	51
29	71	51
30	71	51
31	71	51

	Clearer (%)	Cloudier (%)
1	88	12
2	88	12
3	86	14
4	86	14
5	85	15
6	85	15
7	84	16
8	83	17
9	83	17
10	82	18
11	82	18
12	80	20
13	80	20
14	80	20
15	80	20
16	79	21
17	79	21
18	79	21
19	78	22
20	78	22
21	78	22
22	78	22
23	77	23
24	77	23
25	77	23
26	75	25
27	75	25
28	74	26
29	74	26
30	72	28
31	71	29

	Rain chance (%)
1	4
2	5
3	5
4	5
5	6
6	6
7	6
8	6
9	7
10	7
11	7
12	7
13	7
14	7
15	7
16	7
17	7
18	8
19	8
20	9
21	9
22	10
23	10
24	11
25	11
26	11
27	12
28	12
29	13
30	13
31	13

	Dry (%)	Comfortable (%)	Humid (%)
1	75	24	1
2	76	23	1
3	77	22	1
4	78	21	1
5	79	20	1
6	80	19	1
7	81	18	1
8	82	17	1
9	83	16	1
10	84	15	1
11	84	15	1
12	85	14	1
13	85	14	1
14	85	14	1
15	85	14	1
16	86	13	1
17	86	13	1
18	86	13	1
19	87	12	1
20	87	12	1
21	87	12	1
22	88	11	1
23	88	11	1
24	88	11	1
25	89	10	1
26	89	10	1
27	91	9	0
28	91	9	0
29	91	9	0
30	91	9	0
31	92	8	0