Gilroy weather in March

In March, Gilroy sees average daytime highs of 63°F and overnight lows near 45°F, with 2.5 in of rain across 8 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 4th-wettest month of the year here.

Day-to-day highs hold fairly steady near 63°F through the month. The sky is clear or mostly clear about 36% of the time in March, and the air most often feels dry.

Daylight stretches from about 11 h 06 min at the start of March to 12 h 18 min by month's end. Set against the rest of the year, March is Gilroy's 10th-clearest and 5th-windiest month. For the whole year in context, see Gilroy's year-round climate.

Daytime high
63°
9th warmest
Overnight low
45°
5th coldest
Rainfall
2.5 in
8 wet days
Daylight
11 h 42 min
6:25 AM – 6:07 PM
Cloud cover
53%
10th clearest
Wind
4 mph
5th windiest
Solar energy
4.82 kWh/m²
Travel score
6.0
out of 10

Gilroy is city in Santa Clara County, California, United States.

Density
1,272/km²
people per km²
Founded
1870

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

Temperature in March

Average highAverage lowShaded bands: 10–90% of days

Day-to-day highs hold fairly steady near 63°F through the month.

A typical March day in Gilroy reaches about 63°F in the afternoon and slips back to 45°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 54°F and 72°F. Set against its neighbours, March runs about 3°F warmer than February and about 3°F cooler than April.

30°40°50°60°70°80°151015202531
Avg high (°F)Avg low (°F)
16144
26144
36144
46244
56244
66244
76244
86244
96344
106345
116345
126345
136345
146345
156345
166445
176445
186445
196445
206445
216445
226445
236445
246445
256445
266445
276445
286445
296445
306445
316445

Gilroy weather by month

How March compares with the rest of the year at a glance. March is the 9th-warmest and 4th-wettest month here — the current month is highlighted below.

MonthHigh / Low (°F)Rainfall (inches)Wet daysDaylight (hours)Travel score
Jan58° / 41°3.48.39.74.6
Feb60° / 43°3.48.510.65.0
Mar63° / 45°2.5811.76.0
Apr66° / 47°1.14.612.97.1
May70° / 50°0.52.8148.1
Jun75° / 53°0.10.614.59.2
Jul79° / 57°0.00.214.39.2
Aug79° / 57°0.00.113.49.2
Sep78° / 56°0.10.412.39.2
Oct73° / 51°0.71.9118.7
Nov64° / 45°1.44.7106.7
Dec58° / 40°3.07.79.54.6

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 36% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 17% of March, with mostly cloudy or overcast conditions the remaining 47%. Skies tend to open up as the month goes on.

0%25%50%75%100%151015202531
Clearer (%)Cloudier (%)
15248
25149
35149
45149
55248
65248
75248
85248
95248
105248
115248
125248
135149
145149
155149
165149
175149
185050
195149
205149
215248
225248
235347
245347
255545
265644
275644
285743
295842
305842
315941

Chance of precipitation in March

Any precipitation

Gilroy gets around 2.5 in of rain over 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 25% and peaks near 31% on the wettest days. The odds ease toward the end of the month.

0%10%20%30%40%151015202531
Rain chance (%)
131
230
329
429
528
627
727
826
925
1024
1124
1224
1324
1424
1524
1624
1725
1825
1926
2026
2126
2226
2325
2425
2524
2624
2723
2822
2922
3021
3121

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 100% of days. It rarely turns muggy — the humid and sticky bands barely register.

0%25%50%75%100%151015202531
Dry (%)Comfortable (%)
11000
21000
3991
4991
5991
6991
7991
8991
9991
10991
11991
12991
131000
141000
151000
161000
171000
181000
191000
201000
211000
221000
231000
241000
251000
261000
271000
281000
291000
301000
311000

Wind in March

Winds average 4 mph in March.

Across March, daily wind ranges from about 4 mph on the calmest days to 4 mph at its breeziest. It stays fairly steady from day to day.

0246810151015202531
Wind speed (mph)Feels
14calm
24calm
34calm
44calm
54calm
64calm
74calm
84calm
94calm
104calm
114calm
124calm
134calm
144calm
154calm
164calm
174calm
184calm
194calm
204calm
214calm
224calm
234calm
244calm
254calm
264calm
274calm
284calm
294calm
304calm
314calm

Sunrise & sunset in March

DaylightNight

Daylight runs from about 11 h 06 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 72 minutes over March. Sunrise moves from 6:46 AM to 6:02 AM, and sunset from 5:53 PM to 6:21 PM.

12 AM4 AM8 AM12 PM4 PM8 PM12 AM151015202531
Daylight (h)Sunrise (AM)Sunset (PM)
111.16:465:53
211.16:455:54
311.26:435:55
411.26:425:56
511.36:415:57
611.36:395:58
711.36:385:59
811.46:366:00
911.46:356:01
1011.56:346:02
1111.56:326:02
1211.56:316:03
1311.66:296:04
1411.66:286:05
1511.76:266:06
1611.76:256:07
1711.76:236:08
1811.86:226:09
1911.86:206:10
2011.96:196:11
2111.96:176:12
2211.96:166:13
2312.06:146:13
2412.06:136:14
2512.16:116:15
2612.16:106:16
2712.26:086:17
2812.26:066:18
2912.26:056:19
3012.36:036:20
3112.36:026:21

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 4.82 kWh/m².

For context, solar energy here swings from a low near 2.4 kWh/m² to a high of 7.96 kWh/m² in June across the year — March's 4.82 kWh/m² falls in the middle.

0246151015202531
Solar energy (kWh/m²)Level
14.1Bright
24.1Bright
34.2Bright
44.2Bright
54.3Bright
64.3Bright
74.4Bright
84.4Bright
94.5Bright
104.5Bright
114.6Bright
124.6Bright
134.7Bright
144.7Bright
154.8Bright
164.8Bright
174.8Bright
184.9Bright
194.9Bright
205.0Bright
215.0Bright
225.1Bright
235.1Bright
245.2Bright
255.2Bright
265.3Bright
275.3Bright
285.4Bright
295.5Bright
305.5Bright
315.6Bright
Planning a trip in March

Is March a good time to visit Gilroy?

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

6.0
Sightseeing
9th-best month of the year
1.6
Beach & pool
9th-best month of the year

March is a reasonable time to visit Gilroy for sightseeing.

What to pack for Gilroy in March

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

In March, Gilroy sees daytime highs around 63°F and nights near 45°F. Worth packing: a warm layer, rain gear and sun protection. About 8 days see rain.

a warm layerrain gearsun protection

Sea temperature near Gilroy in March

The nearest coast averages about 55°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 19 mi away) is warmest in September at about 58°F and coldest in April near 54°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
Jan55Bracing
Feb55Bracing
Mar55Bracing
Apr54Bracing
May54Bracing
Jun55Bracing
Jul57Bracing
Aug58Bracing
Sep58Bracing
Oct58Bracing
Nov56Bracing
Dec55Bracing

UV index in Gilroy in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Gilroy peaks around June 22 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 14 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 22UV 10Dec 14UV 2
UV index (midday)Level
Jan3Moderate
Feb4Moderate
Mar4Moderate
Apr7High
May8Very high
Jun11Extreme
Jul10Extreme
Aug10Very high
Sep7High
Oct5High
Nov2Moderate
Dec2Moderate

Air quality in Gilroy 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 Gilroy is worst in August — around 22 µg/m³ PM2.5 (moderate), about 4.2× the cleanest month (June, 5 µg/m³).

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

0102030JanFebMarAprMayJunJulAugSepOctNovDecGoodModerateGoodAug 1920 µg/m³Jun 135 µg/m³
PM2.5 (µg/m³)Level
Jan7Good
Feb8Good
Mar8Good
Apr7Good
May6Good
Jun5Good
Jul8Good
Aug22Moderate
Sep15Moderate
Oct12Moderate
Nov8Good
Dec7Good
Location & terrain

Where is Gilroy?

Gilroy sits at 37.0°N, 121.6°W, 200 ft above sea level, in United States. The nearest listed city is Morgan Hill, 9.9 mi away.

Topography around Gilroy

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

Within 2 miles, the terrain around Gilroy has only modest variations in elevation — a maximum elevation change of 640 ft around an average of 217 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 2,871 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 5,161 ft.

The land around Gilroy is covered by artificial surfaces (49%) and cropland (25%) within 2 miles, trees (38%) and grassland (36%) within 10 miles, and grassland (39%) and trees (27%) within 50 miles.

2 miles
640 ft
10 miles
2,871 ft
50 miles
5,161 ft
treesshrubsgrasslandcroplandartificial surfacesbare terrainwater
March weather nearby: Morgan Hill 9.9 mi · Watsonville 12 mi · Hollister 14 mi · Prunedale 17 mi · Live Oak 23 mi · Salinas 23 mi · Santa Cruz 25 mi · Marina 25 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 Gilroy (37.0058°, -121.5683°, elevation 200 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).