Millbrae weather in October

In October, Millbrae sees average daytime highs of 64°F and overnight lows near 55°F, with 0.9 in of rain across 3.1 wet days and about 11 hours of daylight. It is the 3rd-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 65°F in the first days to 62°F by the end. The sky is clear or mostly clear about 56% 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 30 min by month's end. Set against the rest of the year, October is Millbrae's 3rd-clearest and 11th-windiest month. For the whole year in context, see Millbrae's year-round climate.

Daytime high
64°
3rd warmest
Overnight low
55°
9th coldest
Rainfall
0.9 in
3.1 wet days
Daylight
11 hours
6:24 AM – 5:25 PM
Cloud cover
39%
3rd clearest
Wind
7 mph
11th windiest
Solar energy
4.18 kWh/m²
Travel score
7.1
out of 10

Millbrae is city located in northern San Mateo County, California, United States.

Density
2,701/km²
people per km²
Founded
1948

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 65°F in the first days to 62°F by the end.

A typical October day in Millbrae reaches about 64°F in the afternoon and slips back to 55°F overnight — a 8°F spread between the day's warmth and the night's chill. On most days the high lands between 59°F and 70°F. Set against its neighbours, October runs about 1°F cooler than September and about 5°F warmer than November.

50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
16556
26556
36556
46556
56556
66556
76556
86556
96556
106456
116456
126456
136456
146455
156455
166455
176455
186455
196455
206455
216355
226355
236355
246355
256355
266355
276254
286254
296254
306254
316254

Millbrae weather by month

How October compares with the rest of the year at a glance. October is the 3rd-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan55° / 48°4.0109.73.6
Feb56° / 49°4.29.410.63.8
Mar57° / 50°3.19.311.74.2
Apr58° / 51°1.55.312.94.8
May59° / 52°0.73.1145.5
Jun61° / 54°0.20.814.56.5
Jul63° / 55°0.00.114.37.1
Aug64° / 57°0.00.113.47.5
Sep65° / 57°0.10.512.37.7
Oct64° / 55°0.93.1117.1
Nov59° / 52°2.16.2105.1
Dec56° / 49°4.09.89.53.7

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 56% of the time in October.

Beyond those clear spells, partly cloudy skies cover about 15% of October, with mostly cloudy or overcast conditions the remaining 29%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
17723
27723
37723
47624
57624
67624
77525
87426
97426
107426
117426
127228
137228
147228
157129
167030
177030
187030
196931
206931
216832
226832
236832
246733
256733
266733
276733
286733
296634
306634
316535

Chance of precipitation in October

Any precipitation

Millbrae gets around 0.9 in of rain over 3.1 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 10% and peaks near 16% on the wettest days. The odds climb toward the end of the month.

0%10%20%30%151015202531
Rain chance (%)
15
25
36
46
56
66
77
87
97
107
118
128
138
148
158
169
179
189
1910
2010
2111
2212
2312
2413
2513
2614
2714
2815
2915
3015
3116

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 73% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
162371
263361
364351
465341
565341
666331
767321
868311
969301
1069301
1170291
1270291
1370291
1471281
1571281
1672271
1772271
1874260
1975250
2075250
2176240
2277230
2377230
2478220
2579210
2679210
2780200
2880200
2981190
3081190
3182180

Wind in October

Winds average 7 mph in October.

Across October, daily wind ranges from about 7 mph on the calmest days to 7 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
17calm
27calm
37calm
47calm
57calm
67calm
77calm
87calm
97calm
107calm
117calm
127calm
137calm
147calm
157calm
167calm
177calm
187calm
197calm
207calm
217calm
227calm
237calm
247calm
257calm
267calm
277calm
287calm
297calm
307calm
317calm

Sunrise & sunset in October

DaylightNight

Daylight runs from about 11 h 36 min at the start of October to 10 h 30 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 6:10 AM to 6:40 AM, and sunset from 5:47 PM to 5:07 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.66:105:47
211.66:115:46
311.56:125:44
411.56:135:42
511.56:145:41
611.46:155:39
711.46:165:38
811.36:165:36
911.36:175:35
1011.36:185:33
1111.26:195:32
1211.26:205:31
1311.16:215:29
1411.16:225:28
1511.16:235:26
1611.06:245:25
1711.06:255:24
1810.96:265:22
1910.96:275:21
2010.96:285:20
2110.86:295:18
2210.86:305:17
2310.76:315:16
2410.76:325:15
2510.76:335:13
2610.66:345:12
2710.66:355:11
2810.66:365:10
2910.56:375:09
3010.56:395:08
3110.56:405:07

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 4.18 kWh/m².

For context, solar energy here swings from a low near 2.25 kWh/m² to a high of 7.64 kWh/m² in June across the year — October's 4.18 kWh/m² falls in the middle.

024151015202531
Solar energy (kWh/m²)Level
14.9Bright
24.9Bright
34.8Bright
44.8Bright
54.8Bright
64.7Bright
74.7Bright
84.6Bright
94.5Bright
104.5Bright
114.4Bright
124.4Bright
134.3Bright
144.3Bright
154.2Bright
164.2Bright
174.1Bright
184.1Bright
194.0Bright
204.0Moderate
213.9Moderate
223.9Moderate
233.8Moderate
243.8Moderate
253.7Moderate
263.7Moderate
273.6Moderate
283.6Moderate
293.5Moderate
303.5Moderate
313.5Moderate
Planning a trip in October

Hazard calendar for Millbrae

In seasonPeak

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

Millbrae'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 Millbrae?

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

7.1
Sightseeing
3rd-best month of the year
2.1
Beach & pool
3rd-best month of the year

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

What to pack for Millbrae in October

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

In October, Millbrae sees daytime highs around 64°F and nights near 55°F. Little to plan around — just the basics. About 3 days see rain.

Sea temperature near Millbrae in October

The nearest coast averages about 57°F in October — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 13 mi away) is warmest in September at about 58°F and coldest in April near 53°F.

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

52°54°56°58°60°JanFebMarAprMayJunJulAugSepOctNovDecbracingcool
Sea temperature (°F)Comfort
Jan53Bracing
Feb54Bracing
Mar54Bracing
Apr53Bracing
May53Bracing
Jun54Bracing
Jul56Bracing
Aug58Bracing
Sep58Bracing
Oct57Bracing
Nov56Bracing
Dec54Bracing

UV index in Millbrae 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 Millbrae peaks around June 23 at about 10 (extreme) — 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJun 23UV 10Dec 15UV 2
UV index (midday)Level
Jan2Moderate
Feb4Moderate
Mar5Moderate
Apr6High
May8Very high
Jun10Extreme
Jul10Extreme
Aug10Very high
Sep6High
Oct5High
Nov2Moderate
Dec2Moderate

Air quality in Millbrae 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 Millbrae is worst in August — around 25 µg/m³ PM2.5 (moderate), about 2.5× the cleanest month (June, 10 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecModerateGoodModerateAug 1824 µg/m³Jun 1110 µg/m³
PM2.5 (µg/m³)Level
Jan15Moderate
Feb18Moderate
Mar16Moderate
Apr12Moderate
May10Good
Jun10Good
Jul11Good
Aug25Moderate
Sep17Moderate
Oct20Moderate
Nov18Moderate
Dec13Moderate
Location & terrain

Where is Millbrae?

Millbrae sits at 37.6°N, 122.4°W, 33 ft above sea level, in United States. The nearest listed city is Burlingame, 1.2 mi away.

Topography around Millbrae

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

Within 2 miles, the terrain around Millbrae has only modest variations in elevation — a maximum elevation change of 663 ft around an average of 141 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,005 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,452 ft.

The land around Millbrae is covered by artificial surfaces (56%) and trees (22%) within 2 miles, water (44%), trees (27%) and artificial surfaces (21%) within 10 miles, and water (42%), trees (22%) and grassland (21%) within 50 miles.

2 miles
663 ft
10 miles
2,005 ft
50 miles
4,452 ft
treesgrasslandcroplandartificial surfacesbare terrainwaterwetland
October weather nearby: Burlingame 1.2 mi · San Bruno 2.5 mi · South San Francisco 3.7 mi · San Mateo 4.3 mi · Pacifica 5.6 mi · Foster City 6.8 mi · Belmont 8.1 mi · Visitacion Valley 8.1 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 Millbrae (37.5986°, -122.3872°, elevation 33 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).