Rancho Cucamonga weather in March

In March, Rancho Cucamonga sees average daytime highs of 67°F and overnight lows near 47°F, with 2.7 in of rain across 6.8 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 3rd-wettest month of the year here.

Highs climb over the month, from about 65°F in the first days to 68°F by the end. The sky is clear or mostly clear about 43% of the time in March, and the air most often feels dry.

Daylight stretches from about 11 h 12 min at the start of March to 12 h 18 min by month's end. Set against the rest of the year, March is Rancho Cucamonga's 10th-clearest and 6th-windiest month. For the whole year in context, see Rancho Cucamonga's year-round climate.

Daytime high
67°
9th warmest
Overnight low
47°
4th coldest
Rainfall
2.7 in
6.8 wet days
Daylight
11 h 42 min
6:08 AM – 5:52 PM
Cloud cover
47%
10th clearest
Wind
3 mph
6th windiest
Solar energy
5.36 kWh/m²
Travel score
6.8
out of 10

Rancho Cucamonga is suburban city in San Bernardino County, California, United States.

Density
1,692/km²
people per km²
Founded
1977

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

Temperature in March

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 65°F in the first days to 68°F by the end.

A typical March day in Rancho Cucamonga reaches about 67°F in the afternoon and slips back to 47°F overnight — a 20°F spread between the day's warmth and the night's chill. On most days the high lands between 56°F and 78°F. Set against its neighbours, March runs about 3°F warmer than February and about 4°F cooler than April.

40°60°80°151015202531
Avg high (°F)Avg low (°F)
16445
26445
36545
46545
56546
66546
76646
86646
96646
106746
116746
126747
136747
146747
156747
166747
176847
186847
196847
206847
216847
226848
236848
246848
256848
266848
276848
286848
296848
306848
316848

How March really feels in Rancho Cucamonga

Once humidity and wind are folded in, March averages 0 days that feel above 90°F and 0 that feel at or below 32°F — the comfort signal a plain temperature reading hides.

Days feeling ≥ 90°F
0
heat index over the day's high
Days feeling ≤ 32°F
0
wind chill below the day's low

March sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Rancho Cucamonga weather by month

How March compares with the rest of the year at a glance. March is the 9th-warmest and 3rd-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan63° / 42°3.86.6106.2
Feb64° / 44°4.47.410.76.2
Mar67° / 47°2.76.811.76.8
Apr71° / 50°1.24.612.87.8
May76° / 55°0.62.613.78.6
Jun83° / 60°0.10.514.27.8
Jul89° / 65°0.10.5145.5
Aug91° / 67°0.00.313.34.9
Sep88° / 63°0.21.212.26.1
Oct79° / 56°0.93.111.18.3
Nov70° / 48°1.23.510.27.9
Dec62° / 42°2.65.89.86.2

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 43% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 15% of March, with mostly cloudy or overcast conditions the remaining 42%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15149
25248
35347
45446
55446
65446
75545
85644
95743
105842
115941
125941
135941
145941
156040
165941
176040
186040
195941
205941
215941
225941
235941
245941
255941
266040
276040
286139
296238
306238
316337

Chance of precipitation in March

Any precipitation

Rancho Cucamonga gets around 2.7 in of rain over 6.8 wet days in March. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 22% and peaks near 29% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
129
228
328
427
527
626
725
824
923
1023
1122
1221
1321
1421
1521
1621
1721
1821
1921
2021
2121
2221
2321
2421
2521
2621
2721
2820
2920
3020
3119

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, March lands in the dry band about 99% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
11000
21000
31000
41000
51000
61000
71000
81000
9991
10991
11991
12991
13991
14991
15982
16982
17982
18982
19982
20982
21982
22982
23991
24991
25991
26991
27991
28991
29991
30991
31991

Wind in March

Winds average 3 mph in March.

Across March, 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 March

DaylightNight

Daylight runs from about 11 h 12 min at the start of March to 12 h 18 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 66 minutes over March. Sunrise moves from 6:28 AM to 5:47 AM, and sunset from 5:40 PM to 6:04 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.26:285:40
211.26:265:41
311.36:255:41
411.36:245:42
511.36:235:43
611.46:215:44
711.46:205:45
811.46:195:46
911.56:175:46
1011.56:165:47
1111.66:155:48
1211.66:135:49
1311.66:125:50
1411.76:115:51
1511.76:095:51
1611.76:085:52
1711.86:075:53
1811.86:055:54
1911.86:045:54
2011.96:025:55
2111.96:015:56
2212.06:005:57
2312.05:585:58
2412.05:575:58
2512.15:555:59
2612.15:546:00
2712.15:536:01
2812.25:516:01
2912.25:506:02
3012.25:486:03
3112.35:476:04

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 5.36 kWh/m².

For context, solar energy here swings from a low near 2.98 kWh/m² to a high of 8.15 kWh/m² in June across the year — March's 5.36 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.5Bright
24.6Bright
34.6Bright
44.7Bright
54.8Bright
64.8Bright
74.9Bright
85.0Bright
95.0Bright
105.1Bright
115.1Bright
125.2Bright
135.2Bright
145.3Bright
155.3Bright
165.4Bright
175.4Bright
185.5Bright
195.5Bright
205.5Bright
215.6Bright
225.6Bright
235.7Bright
245.7Bright
255.8Bright
265.8Bright
275.8Bright
285.9Bright
295.9Bright
306.0Bright
316.0Intense
Planning a trip in March

Is March a good time to visit Rancho Cucamonga?

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

6.8
Sightseeing
6th-best month of the year
3.2
Beach & pool
9th-best month of the year

March is a reasonable time to visit Rancho Cucamonga for sightseeing.

What to pack for Rancho Cucamonga in March

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

In March, Rancho Cucamonga sees daytime highs around 67°F and nights near 47°F. Worth packing: sun protection. About 7 days see rain.

sun protection

Sea temperature near Rancho Cucamonga in March

The nearest coast averages about 59°F in March — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 37 mi away) is warmest in August at about 69°F and coldest in February near 59°F.

It's comfortable for a long swim from Jul 13 to Sep 28 — about 2.6 months when the water holds above 68°F.

60°65°70°JanFebMarAprMayJunJulAugSepOctNovDecbracingcoolrefreshingcomfortable to swim
Sea temperature (°F)Comfort
Jan59Cool
Feb59Cool
Mar59Cool
Apr60Cool
May63Cool
Jun65Cool
Jul68Refreshing
Aug69Refreshing
Sep69Refreshing
Oct67Cool
Nov64Cool
Dec60Cool

UV index in Rancho Cucamonga in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March 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 Rancho Cucamonga peaks around July 12 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.

025710JanFebMarAprMayJunJulAugSepOctNovDecModerateHighVery highExtremeVery highHighModerateJul 12UV 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 Rancho Cucamonga in March

GoodModeratePoorUnhealthyVery unhealthy

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

Air quality in Rancho Cucamonga is worst in September — around 49 µg/m³ PM2.5 (poor), about 4.0× the cleanest month (May, 12 µg/m³).

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

0204060JanFebMarAprMayJunJulAugSepOctNovDecModeratePoorModerateSep 1447 µg/m³May 1713 µg/m³
PM2.5 (µg/m³)Level
Jan18Moderate
Feb19Moderate
Mar19Moderate
Apr17Moderate
May12Moderate
Jun17Moderate
Jul19Moderate
Aug32Moderate
Sep49Poor
Oct21Moderate
Nov21Moderate
Dec18Moderate
Location & terrain

Where is Rancho Cucamonga?

Rancho Cucamonga sits at 34.1°N, 117.6°W, 1,207 ft above sea level, in United States. The nearest listed city is Upland, 3.1 mi away.

Topography around Rancho Cucamonga

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

Within 2 miles, the terrain around Rancho Cucamonga has only modest variations in elevation — a maximum elevation change of 522 ft around an average of 1,240 ft above sea level; within 10 miles, extreme variations in elevation — a maximum elevation change of 8,238 ft; within 50 miles, extreme variations in elevation — a maximum elevation change of 11,424 ft.

The land around Rancho Cucamonga is covered by artificial surfaces (84%) within 2 miles, artificial surfaces (54%) and shrubs (21%) within 10 miles, and artificial surfaces (25%), shrubs (23%) and grassland (21%) within 50 miles.

2 miles
522 ft
10 miles
8,238 ft
50 miles
11,424 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
March weather nearby: Upland 3.1 mi · Ontario 4.3 mi · Montclair 5.6 mi · Claremont 7.5 mi · Chino 8.7 mi · Jurupa Valley 9.3 mi · Glen Avon 9.3 mi · Fontana 9.3 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 Rancho Cucamonga (34.1064°, -117.5931°, elevation 1,207 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).