Monrovia weather in October

In October, Monrovia sees average daytime highs of 76°F and overnight lows near 55°F, with 0.8 in of rain across 2.6 wet days and about 11.1 hours of daylight. It is the 5th-warmest and 7th-wettest month of the year here.

Highs ease over the month, from about 80°F in the first days to 71°F by the end. The sky is clear or mostly clear about 75% 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 Monrovia's 5th-clearest and 9th-windiest month. For the whole year in context, see Monrovia's year-round climate.

Daytime high
76°
5th warmest
Overnight low
55°
8th coldest
Rainfall
0.8 in
2.6 wet days
Daylight
11 h 06 min
6:03 AM – 5:11 PM
Cloud cover
22%
5th clearest
Wind
3 mph
9th windiest
Solar energy
4.8 kWh/m²
Travel score
8.7
out of 10

Monrovia is city in the San Gabriel Valley of Los Angeles County, California, United States.

Density
1,055/km²
people per km²
Founded
1887

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 71°F by the end.

A typical October day in Monrovia reaches about 76°F in the afternoon and slips back to 55°F overnight — a 21°F spread between the day's warmth and the night's chill. On most days the high lands between 64°F and 87°F. Set against its neighbours, October runs about 8°F cooler than September and about 9°F warmer than November.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
18058
28058
38058
47957
57957
67957
77856
87856
97856
107756
117756
127756
137755
147655
157655
167655
177655
187555
197554
207554
217454
227454
237453
247353
257353
267353
277252
287252
297151
307151
317151

Monrovia weather by month

How October compares with the rest of the year at a glance. October is the 5th-warmest and 7th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysSnow daysDaylight (hours)Travel score
Jan59° / 42°3.55.91.1105.3
Feb60° / 43°3.86.91.510.75.2
Mar63° / 45°2.56.7111.76.3
Apr68° / 47°1.040.312.87.6
May73° / 53°0.53013.88.5
Jun81° / 58°0.10.7014.28.5
Jul86° / 64°0.42.10146.4
Aug88° / 65°0.21.9013.36.0
Sep84° / 61°0.31.8012.27.5
Oct76° / 55°0.82.6011.18.7
Nov66° / 47°0.92.90.210.27.6
Dec59° / 42°2.45.20.79.85.3

Cloud cover in October

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 75% 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 15%. Skies tend to cloud over as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
1919
29010
39010
49010
59010
69010
7919
88911
98911
108911
118911
128812
138812
148812
158713
168614
178515
188515
198416
208317
218218
228218
238119
248119
258119
268020
278020
288020
297921
307921
317921

Chance of precipitation in October

Any precipitation

Monrovia gets around 0.8 in of rain over 2.6 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 9% on the wettest days.

0%10%20%30%151015202531
Rain chance (%)
17
27
37
47
57
67
78
88
98
108
118
128
138
148
158
168
178
188
198
208
218
228
239
249
259
269
279
289
299
309
319

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 97% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)Humid (%)
19460
29550
39550
49550
59640
69640
79640
89640
99730
109631
119631
129631
139721
149721
159721
169721
179721
189721
199811
209811
219811
229811
239811
249910
2510000
2610000
2710000
2810000
2910000
3010000
3110000

Wind in October

Winds average 3 mph in October.

Across October, daily wind ranges from about 3 mph on the calmest days to 3 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
13calm
23calm
33calm
43calm
53calm
63calm
73calm
83calm
93calm
103calm
113calm
123calm
133calm
143calm
153calm
163calm
173calm
183calm
193calm
203calm
213calm
223calm
233calm
243calm
253calm
263calm
273calm
283calm
293calm
303calm
313calm

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 5:51 AM to 6:16 AM, and sunset from 5:31 PM to 4:55 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.75:515:31
211.65:525:29
311.65:535:28
411.65:535:27
511.55:545:25
611.55:555:24
711.45:565:23
811.45:575:21
911.45:575:20
1011.35:585:19
1111.35:595:17
1211.36:005:16
1311.26:015:15
1411.26:015:13
1511.26:025:12
1611.16:035:11
1711.16:045:10
1811.16:055:09
1911.06:065:07
2011.06:075:06
2111.06:075:05
2210.96:085:04
2310.96:095:03
2410.96:105:02
2510.86:115:01
2610.86:125:00
2710.86:134:59
2810.76:144:58
2910.76:154:57
3010.76:154:56
3110.66:164:55

Solar energy in October

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in October, about 4.8 kWh/m².

For context, solar energy here swings from a low near 2.96 kWh/m² to a high of 8.18 kWh/m² in June across the year — October's 4.8 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
15.5Bright
25.5Bright
35.5Bright
45.4Bright
55.4Bright
65.3Bright
75.3Bright
85.2Bright
95.2Bright
105.1Bright
115.1Bright
125.0Bright
135.0Bright
144.9Bright
154.9Bright
164.8Bright
174.8Bright
184.7Bright
194.7Bright
204.6Bright
214.5Bright
224.5Bright
234.5Bright
244.4Bright
254.4Bright
264.3Bright
274.3Bright
284.2Bright
294.2Bright
304.2Bright
314.1Bright
Planning a trip in October

Is October a good time to visit Monrovia?

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

8.7
Sightseeing
1st-best month of the year
7.3
Beach & pool
5th-best month of the year

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

What to pack for Monrovia in October

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

In October, Monrovia sees daytime highs around 76°F and nights near 55°F. Worth packing: light clothes and sun protection.

light clothessun protection

Sea temperature near Monrovia in October

The nearest coast averages about 66°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 29 mi away) is warmest in August at about 68°F and coldest in February near 59°F.

It's comfortable for a long swim from Aug 4 to Sep 13 — about 1.3 months when the water holds above 68°F.

60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshing
Sea temperature (°F)Comfort
Jan59Bracing
Feb59Bracing
Mar59Bracing
Apr59Cool
May62Cool
Jun65Cool
Jul67Cool
Aug68Refreshing
Sep68Refreshing
Oct66Cool
Nov63Cool
Dec60Cool

UV index in Monrovia 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 Monrovia peaks around July 11 at about 11 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 16 at about 3 (moderate).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 11 months of the year.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateVery highExtremeVery highHighModerateJul 11UV 11Dec 16UV 3
UV index (midday)Level
Jan4Moderate
Feb5Moderate
Mar5Moderate
Apr8Very high
May8Very high
Jun11Extreme
Jul11Extreme
Aug10Extreme
Sep8Very high
Oct6High
Nov3Moderate
Dec3Moderate

Air quality in Monrovia 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 Monrovia is worst in September — around 39 µg/m³ PM2.5 (poor), about 3.2× the cleanest month (May, 12 µg/m³).

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

010203040JanFebMarAprMayJunJulAugSepOctNovDecModerateModerateSep 1537 µg/m³May 1612 µg/m³
PM2.5 (µg/m³)Level
Jan14Moderate
Feb15Moderate
Mar16Moderate
Apr14Moderate
May12Moderate
Jun15Moderate
Jul18Moderate
Aug22Moderate
Sep39Poor
Oct15Moderate
Nov17Moderate
Dec14Moderate
Location & terrain

Where is Monrovia?

Monrovia sits at 34.1°N, 118.0°W, 571 ft above sea level, in United States. The nearest listed city is Duarte, 1.2 mi away.

Topography around Monrovia

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

Within 2 miles, the terrain around Monrovia has significant variations in elevation — a maximum elevation change of 1,785 ft around an average of 686 ft above sea level; within 10 miles, very significant variations in elevation — a maximum elevation change of 5,932 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 10,013 ft.

The land around Monrovia is covered by artificial surfaces (58%) and trees (31%) within 2 miles, artificial surfaces (43%), shrubs (27%) and trees (23%) within 10 miles, and artificial surfaces (26%) and grassland (20%) within 50 miles.

2 miles
1,785 ft
10 miles
5,932 ft
50 miles
10,013 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
October weather nearby: Duarte 1.2 mi · Arcadia 1.9 mi · Temple City 4.3 mi · Baldwin Park 5.0 mi · Azusa 5.6 mi · El Monte 5.6 mi · Rosemead 6.2 mi · West Covina 6.2 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 Monrovia (34.1481°, -117.9989°, elevation 571 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).