Alum Rock weather in March

In March, Alum Rock sees average daytime highs of 61°F and overnight lows near 44°F, with 3.3 in of rain across 9.2 wet days and about 11.7 hours of daylight. It is the 9th-warmest and 4th-wettest month of the year here.

Highs climb over the month, from about 60°F in the first days to 62°F by the end. The sky is clear or mostly clear about 35% 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 Alum Rock's 10th-clearest and 3rd-windiest month. For the whole year in context, see Alum Rock's year-round climate.

Daytime high: 61°; 9th warmest
Overnight low: 44°; 4th coldest
Rainfall: 3.3 in; 9.2 wet days
Daylight: 11 h 42 min; 6:26 AM – 6:08 PM
Cloud cover: 55%; 10th clearest
Wind: 4 mph; 3rd windiest
Solar energy: 4.77 kWh/m²
Travel score: 5.4; out of 10

Alum Rock is census-designated place in Santa Clara County, California.

Density: 7,068/km²; people per km²

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

← February Alum Rock year-round climate April →Best places to visit in March

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

Temperature in March

Average highAverage lowShaded bands: 10–90% of days

Highs climb over the month, from about 60°F in the first days to 62°F by the end.

A typical March day in Alum Rock reaches about 61°F in the afternoon and slips back to 44°F overnight — a 18°F spread between the day's warmth and the night's chill. On most days the high lands between 52°F and 72°F. Set against its neighbours, March runs about 3°F warmer than February and about 4°F cooler than April.

	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)	59	59	60	60	60	60	60	61	61	61	61	62	62	62	62	62	62	62	62	62	62	62	62	62	62	62	62	62	62	62	63
Avg low (°F)	42	42	42	43	43	43	43	43	43	43	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44	44

	Avg high (°F)	Avg low (°F)
1	59	42
2	59	42
3	60	42
4	60	43
5	60	43
6	60	43
7	60	43
8	61	43
9	61	43
10	61	43
11	61	44
12	62	44
13	62	44
14	62	44
15	62	44
16	62	44
17	62	44
18	62	44
19	62	44
20	62	44
21	62	44
22	62	44
23	62	44
24	62	44
25	62	44
26	62	44
27	62	44
28	62	44
29	62	44
30	62	44
31	63	44

Alum Rock 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.

Month	High / Low (°F)	Rainfall (inches)	Wet days	Daylight (hours)	Travel score
Jan	56° / 40°	4.4	9.1	9.7	4.1
Feb	58° / 42°	4.4	9.2	10.6	4.4
Mar	61° / 44°	3.3	9.2	11.7	5.4
Apr	65° / 45°	1.6	5.7	12.9	6.7
May	71° / 49°	0.8	3.4	14	8.1
Jun	77° / 53°	0.2	0.8	14.5	9.1
Jul	82° / 57°	0.1	0.2	14.3	8.8
Aug	82° / 57°	0.0	0.3	13.4	8.8
Sep	80° / 56°	0.1	0.6	12.3	8.9
Oct	73° / 51°	1.0	2.8	11	8.6
Nov	63° / 44°	1.9	5.7	10	6.2
Dec	56° / 40°	3.9	8.8	9.5	4.0

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 35% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 14% of March, with mostly cloudy or overcast conditions the remaining 50%.

	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 (%)	50	50	50	49	50	50	50	50	49	49	49	48	48	47	47	47	46	46	46	46	48	49	49	50	50	52	52	53	54	54	54
Cloudier (%)	50	50	50	51	50	50	50	50	51	51	51	52	52	53	53	53	54	54	54	54	52	51	51	50	50	48	48	47	46	46	46

	Clearer (%)	Cloudier (%)
1	50	50
2	50	50
3	50	50
4	49	51
5	50	50
6	50	50
7	50	50
8	50	50
9	49	51
10	49	51
11	49	51
12	48	52
13	48	52
14	47	53
15	47	53
16	47	53
17	46	54
18	46	54
19	46	54
20	46	54
21	48	52
22	49	51
23	49	51
24	50	50
25	50	50
26	52	48
27	52	48
28	53	47
29	54	46
30	54	46
31	54	46

Chance of precipitation in March

Any precipitation

Alum Rock gets around 3.3 in of rain over 9.2 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 29% and peaks near 34% on the wettest days. The odds ease 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 (%)	34	34	33	32	32	31	31	30	29	29	28	28	28	28	28	29	29	29	30	30	30	29	29	28	28	27	27	26	25	25	24

	Rain chance (%)
1	34
2	34
3	33
4	32
5	32
6	31
7	31
8	30
9	29
10	29
11	28
12	28
13	28
14	28
15	28
16	29
17	29
18	29
19	30
20	30
21	30
22	29
23	29
24	28
25	28
26	27
27	27
28	26
29	25
30	25
31	24

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.

	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 (%)	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100	100

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

Wind in March

Winds average 4 mph in March.

Across March, daily wind ranges from about 4 mph on the calmest days to 5 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)	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	4	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	4	calm
2	4	calm
3	4	calm
4	4	calm
5	4	calm
6	4	calm
7	4	calm
8	4	calm
9	4	calm
10	4	calm
11	4	calm
12	4	calm
13	4	calm
14	4	calm
15	4	calm
16	4	calm
17	4	calm
18	4	calm
19	4	calm
20	4	calm
21	4	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 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 6:48 AM to 6:03 AM, and sunset from 5:54 PM to 6:22 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)	11.1	11.1	11.2	11.2	11.3	11.3	11.3	11.4	11.4	11.5	11.5	11.5	11.6	11.6	11.7	11.7	11.7	11.8	11.8	11.9	11.9	11.9	12.0	12.0	12.1	12.1	12.2	12.2	12.2	12.3	12.3
Sunrise (AM)	6:48	6:46	6:45	6:43	6:42	6:41	6:39	6:38	6:36	6:35	6:33	6:32	6:30	6:29	6:27	6:26	6:24	6:23	6:21	6:20	6:18	6:17	6:15	6:14	6:12	6:10	6:09	6:07	6:06	6:04	6:03
Sunset (PM)	5:54	5:55	5:56	5:57	5:57	5:58	5:59	6:00	6:01	6:02	6:03	6:04	6:05	6:06	6:07	6:08	6:09	6:10	6:11	6:12	6:13	6:14	6:15	6:15	6:16	6:17	6:18	6:19	6:20	6:21	6:22

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.1	6:48	5:54
2	11.1	6:46	5:55
3	11.2	6:45	5:56
4	11.2	6:43	5:57
5	11.3	6:42	5:57
6	11.3	6:41	5:58
7	11.3	6:39	5:59
8	11.4	6:38	6:00
9	11.4	6:36	6:01
10	11.5	6:35	6:02
11	11.5	6:33	6:03
12	11.5	6:32	6:04
13	11.6	6:30	6:05
14	11.6	6:29	6:06
15	11.7	6:27	6:07
16	11.7	6:26	6:08
17	11.7	6:24	6:09
18	11.8	6:23	6:10
19	11.8	6:21	6:11
20	11.9	6:20	6:12
21	11.9	6:18	6:13
22	11.9	6:17	6:14
23	12.0	6:15	6:15
24	12.0	6:14	6:15
25	12.1	6:12	6:16
26	12.1	6:10	6:17
27	12.2	6:09	6:18
28	12.2	6:07	6:19
29	12.2	6:06	6:20
30	12.3	6:04	6:21
31	12.3	6:03	6:22

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 4.77 kWh/m².

For context, solar energy here swings from a low near 2.36 kWh/m² to a high of 7.99 kWh/m² in June across the year — March's 4.77 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)	4.0	4.1	4.1	4.2	4.2	4.3	4.3	4.4	4.5	4.5	4.5	4.6	4.6	4.7	4.7	4.8	4.8	4.8	4.9	4.9	5.0	5.0	5.1	5.1	5.2	5.3	5.3	5.4	5.4	5.5	5.5
Level	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	4.0	Bright
2	4.1	Bright
3	4.1	Bright
4	4.2	Bright
5	4.2	Bright
6	4.3	Bright
7	4.3	Bright
8	4.4	Bright
9	4.5	Bright
10	4.5	Bright
11	4.5	Bright
12	4.6	Bright
13	4.6	Bright
14	4.7	Bright
15	4.7	Bright
16	4.8	Bright
17	4.8	Bright
18	4.8	Bright
19	4.9	Bright
20	4.9	Bright
21	5.0	Bright
22	5.0	Bright
23	5.1	Bright
24	5.1	Bright
25	5.2	Bright
26	5.3	Bright
27	5.3	Bright
28	5.4	Bright
29	5.4	Bright
30	5.5	Bright
31	5.5	Bright

Planning a trip in March

Hazard calendar for Alum Rock

In seasonPeak

In March, Alum Rock sits inside its rainy season season. The full year is below, with each hazard's peak months called out.

Alum Rock's rainy season runs December–March, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is March a good time to visit Alum Rock?

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

5.4

Sightseeing

9th-best month of the year

0.9

Beach & pool

9th-best month of the year

March is a reasonable time to visit Alum Rock for sightseeing.

What to pack for Alum Rock in March

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

In March, Alum Rock sees daytime highs around 61°F and nights near 44°F. Worth packing: a warm layer, rain gear and sun protection. About 9 days see rain.

a warm layerrain gearsun protection

Sea temperature near Alum Rock in March

The nearest coast averages about 54°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 30 mi away) is warmest in August at about 59°F and coldest in April near 54°F.

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

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°F)	54	54	54	54	54	55	57	59	59	58	56	55
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°F)	Comfort
Jan	54	Bracing
Feb	54	Bracing
Mar	54	Bracing
Apr	54	Bracing
May	54	Bracing
Jun	55	Bracing
Jul	57	Bracing
Aug	59	Bracing
Sep	59	Bracing
Oct	58	Bracing
Nov	56	Bracing
Dec	55	Bracing

UV index in Alum Rock 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 Alum Rock 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.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	3	4	5	7	8	10	10	10	6	5	2	2
Level	Moderate	Moderate	Moderate	High	Very high	Extreme	Extreme	Very high	High	High	Moderate	Moderate

	UV index (midday)	Level
Jan	3	Moderate
Feb	4	Moderate
Mar	5	Moderate
Apr	7	High
May	8	Very high
Jun	10	Extreme
Jul	10	Extreme
Aug	10	Very high
Sep	6	High
Oct	5	High
Nov	2	Moderate
Dec	2	Moderate

Air quality in Alum Rock 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 Alum Rock is worst in August — around 34 µg/m³ PM2.5 (moderate), about 4.9× the cleanest month (June, 7 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)	13	13	13	10	8	7	9	34	16	14	15	12
Level	Moderate	Moderate	Moderate	Good	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Good

	PM2.5 (µg/m³)	Level
Jan	13	Moderate
Feb	13	Moderate
Mar	13	Moderate
Apr	10	Good
May	8	Good
Jun	7	Good
Jul	9	Good
Aug	34	Moderate
Sep	16	Moderate
Oct	14	Moderate
Nov	15	Moderate
Dec	12	Good

Location & terrain

Where is Alum Rock?

Alum Rock sits at 37.4°N, 121.8°W, 151 ft above sea level, in United States. The nearest listed city is San Jose, 4.3 mi away.

Topography around Alum Rock

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

Within 2 miles, the terrain around Alum Rock has significant variations in elevation — a maximum elevation change of 1,129 ft around an average of 240 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 3,921 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 4,373 ft.

The land around Alum Rock is covered by artificial surfaces (73%) within 2 miles, artificial surfaces (42%), grassland (33%) and trees (22%) within 10 miles, and grassland (29%), trees (25%) and water (25%) within 50 miles.

2 miles

1,129 ft

artificial surfaces 73%

10 miles

3,921 ft

artificial surfaces 42%

50 miles

4,373 ft

grassland 29%

treesgrasslandcroplandartificial surfaceswaterwetland

← February Alum Rock year-round climate April →Best places to visit in March

March weather nearby: San Jose 4.3 mi · Milpitas 6.2 mi · Santa Clara 6.8 mi · Campbell 8.7 mi · Sunnyvale 11 mi · Cupertino 12 mi · Los Gatos 12 mi · Saratoga 13 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 Alum Rock (37.3661°, -121.8272°, elevation 151 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).

	Avg high (°F)	Avg low (°F)
1	59	42
2	59	42
3	60	42
4	60	43
5	60	43
6	60	43
7	60	43
8	61	43
9	61	43
10	61	43
11	61	44
12	62	44
13	62	44
14	62	44
15	62	44
16	62	44
17	62	44
18	62	44
19	62	44
20	62	44
21	62	44
22	62	44
23	62	44
24	62	44
25	62	44
26	62	44
27	62	44
28	62	44
29	62	44
30	62	44
31	63	44

	Clearer (%)	Cloudier (%)
1	50	50
2	50	50
3	50	50
4	49	51
5	50	50
6	50	50
7	50	50
8	50	50
9	49	51
10	49	51
11	49	51
12	48	52
13	48	52
14	47	53
15	47	53
16	47	53
17	46	54
18	46	54
19	46	54
20	46	54
21	48	52
22	49	51
23	49	51
24	50	50
25	50	50
26	52	48
27	52	48
28	53	47
29	54	46
30	54	46
31	54	46

	Rain chance (%)
1	34
2	34
3	33
4	32
5	32
6	31
7	31
8	30
9	29
10	29
11	28
12	28
13	28
14	28
15	28
16	29
17	29
18	29
19	30
20	30
21	30
22	29
23	29
24	28
25	28
26	27
27	27
28	26
29	25
30	25
31	24

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°F)	Avg low (°F)
1	59	42
2	59	42
3	60	42
4	60	43
5	60	43
6	60	43
7	60	43
8	61	43
9	61	43
10	61	43
11	61	44
12	62	44
13	62	44
14	62	44
15	62	44
16	62	44
17	62	44
18	62	44
19	62	44
20	62	44
21	62	44
22	62	44
23	62	44
24	62	44
25	62	44
26	62	44
27	62	44
28	62	44
29	62	44
30	62	44
31	63	44

	Clearer (%)	Cloudier (%)
1	50	50
2	50	50
3	50	50
4	49	51
5	50	50
6	50	50
7	50	50
8	50	50
9	49	51
10	49	51
11	49	51
12	48	52
13	48	52
14	47	53
15	47	53
16	47	53
17	46	54
18	46	54
19	46	54
20	46	54
21	48	52
22	49	51
23	49	51
24	50	50
25	50	50
26	52	48
27	52	48
28	53	47
29	54	46
30	54	46
31	54	46

	Rain chance (%)
1	34
2	34
3	33
4	32
5	32
6	31
7	31
8	30
9	29
10	29
11	28
12	28
13	28
14	28
15	28
16	29
17	29
18	29
19	30
20	30
21	30
22	29
23	29
24	28
25	28
26	27
27	27
28	26
29	25
30	25
31	24

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100

	Avg high (°F)	Avg low (°F)
1	59	42
2	59	42
3	60	42
4	60	43
5	60	43
6	60	43
7	60	43
8	61	43
9	61	43
10	61	43
11	61	44
12	62	44
13	62	44
14	62	44
15	62	44
16	62	44
17	62	44
18	62	44
19	62	44
20	62	44
21	62	44
22	62	44
23	62	44
24	62	44
25	62	44
26	62	44
27	62	44
28	62	44
29	62	44
30	62	44
31	63	44

	Clearer (%)	Cloudier (%)
1	50	50
2	50	50
3	50	50
4	49	51
5	50	50
6	50	50
7	50	50
8	50	50
9	49	51
10	49	51
11	49	51
12	48	52
13	48	52
14	47	53
15	47	53
16	47	53
17	46	54
18	46	54
19	46	54
20	46	54
21	48	52
22	49	51
23	49	51
24	50	50
25	50	50
26	52	48
27	52	48
28	53	47
29	54	46
30	54	46
31	54	46

	Rain chance (%)
1	34
2	34
3	33
4	32
5	32
6	31
7	31
8	30
9	29
10	29
11	28
12	28
13	28
14	28
15	28
16	29
17	29
18	29
19	30
20	30
21	30
22	29
23	29
24	28
25	28
26	27
27	27
28	26
29	25
30	25
31	24

	Dry (%)
1	100
2	100
3	100
4	100
5	100
6	100
7	100
8	100
9	100
10	100
11	100
12	100
13	100
14	100
15	100
16	100
17	100
18	100
19	100
20	100
21	100
22	100
23	100
24	100
25	100
26	100
27	100
28	100
29	100
30	100
31	100