Windsor weather in March

In March, Windsor sees average daytime highs of 63°F and overnight lows near 44°F, with 4.4 in of rain across 9.5 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 61°F in the first days to 64°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 Windsor's 9th-clearest and 4th-windiest month. For the whole year in context, see Windsor's year-round climate.

Daytime high: 63°; 9th warmest
Overnight low: 44°; 4th coldest
Rainfall: 4.4 in; 9.5 wet days
Daylight: 11 h 42 min; 6:30 AM – 6:12 PM
Cloud cover: 56%; 9th clearest
Wind: 5 mph; 4th windiest
Solar energy: 4.57 kWh/m²
Travel score: 5.7; out of 10

Windsor is town in Sonoma County, California, United States.

Density: 1,454/km²; people per km²
Founded: 1992

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

← February Windsor 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 61°F in the first days to 64°F by the end.

A typical March day in Windsor reaches about 63°F in the afternoon and slips back to 44°F overnight — a 19°F spread between the day's warmth and the night's chill. On most days the high lands between 53°F and 73°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)	60	61	61	61	61	62	62	62	62	62	63	63	63	63	63	63	63	63	63	63	63	63	63	64	64	64	64	64	64	64	64
Avg low (°F)	42	42	42	42	42	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

	Avg high (°F)	Avg low (°F)
1	60	42
2	61	42
3	61	42
4	61	42
5	61	42
6	62	43
7	62	43
8	62	43
9	62	43
10	62	43
11	63	43
12	63	44
13	63	44
14	63	44
15	63	44
16	63	44
17	63	44
18	63	44
19	63	44
20	63	44
21	63	44
22	63	44
23	63	44
24	64	44
25	64	44
26	64	44
27	64	44
28	64	44
29	64	44
30	64	44
31	64	44

Windsor 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	57° / 40°	5.7	10.3	9.6	4.0
Feb	60° / 42°	5.8	9.3	10.5	4.7
Mar	63° / 44°	4.4	9.5	11.7	5.7
Apr	67° / 46°	1.9	5.6	13	7.0
May	73° / 51°	1.1	3.6	14.1	8.2
Jun	80° / 55°	0.3	1.2	14.6	8.5
Jul	83° / 57°	0.0	0.1	14.4	7.8
Aug	83° / 57°	0.0	0.2	13.5	7.8
Sep	81° / 55°	0.1	0.6	12.3	8.6
Oct	74° / 50°	1.4	3.2	11	8.5
Nov	63° / 44°	3.0	6.2	9.9	6.2
Dec	56° / 39°	5.9	10.1	9.4	3.9

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 15% 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	50	50	50	51	51	51	50	50	49	49	49	49	48	48	48	48	48	47	48	49	50	50	50	51	52	52	53	54
Cloudier (%)	50	50	50	50	50	50	49	49	49	50	50	51	51	51	51	52	52	52	52	52	53	52	51	50	50	50	49	48	48	47	46

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

Chance of precipitation in March

Any precipitation

Windsor gets around 4.4 in of rain over 9.5 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 30% 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	33	33	33	32	32	32	31	31	30	30	30	29	29	30	30	30	30	30	30	30	30	29	29	28	28	27	26	26	25	24

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

Across March, daily wind ranges from about 5 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)	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	5	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	5	calm
2	5	calm
3	5	calm
4	5	calm
5	5	calm
6	5	calm
7	5	calm
8	5	calm
9	5	calm
10	5	calm
11	5	calm
12	5	calm
13	5	calm
14	5	calm
15	5	calm
16	5	calm
17	5	calm
18	5	calm
19	5	calm
20	5	calm
21	5	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 6:53 AM to 6:06 AM, and sunset from 5:56 PM to 6:26 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	11.1	11.2	11.2	11.3	11.3	11.4	11.4	11.4	11.5	11.5	11.6	11.6	11.6	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)	6:53	6:51	6:50	6:48	6:47	6:46	6:44	6:43	6:41	6:40	6:38	6:36	6:35	6:33	6:32	6:30	6:29	6:27	6:25	6:24	6:22	6:21	6:19	6:18	6:16	6:14	6:13	6:11	6:09	6:08	6:06
Sunset (PM)	5:56	5:57	5:58	5:59	6:00	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	6:16	6:17	6:18	6:18	6:19	6:20	6:21	6:22	6:23	6:24	6:25	6:26

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	11.1	6:53	5:56
2	11.1	6:51	5:57
3	11.1	6:50	5:58
4	11.2	6:48	5:59
5	11.2	6:47	6:00
6	11.3	6:46	6:02
7	11.3	6:44	6:03
8	11.4	6:43	6:04
9	11.4	6:41	6:05
10	11.4	6:40	6:06
11	11.5	6:38	6:07
12	11.5	6:36	6:08
13	11.6	6:35	6:09
14	11.6	6:33	6:10
15	11.6	6:32	6:11
16	11.7	6:30	6:12
17	11.7	6:29	6:13
18	11.8	6:27	6:14
19	11.8	6:25	6:15
20	11.9	6:24	6:16
21	11.9	6:22	6:17
22	11.9	6:21	6:18
23	12.0	6:19	6:18
24	12.0	6:18	6:19
25	12.1	6:16	6:20
26	12.1	6:14	6:21
27	12.2	6:13	6:22
28	12.2	6:11	6:23
29	12.2	6:09	6:24
30	12.3	6:08	6:25
31	12.3	6:06	6:26

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 4.57 kWh/m².

For context, solar energy here swings from a low near 2.08 kWh/m² to a high of 8.01 kWh/m² in June across the year — March's 4.57 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)	3.8	3.9	3.9	4.0	4.0	4.1	4.1	4.2	4.3	4.3	4.3	4.4	4.4	4.5	4.5	4.6	4.6	4.7	4.7	4.8	4.8	4.9	4.9	5.0	5.0	5.1	5.1	5.2	5.3	5.3	5.4
Level	Moderate	Moderate	Moderate	Moderate	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	3.8	Moderate
2	3.9	Moderate
3	3.9	Moderate
4	4.0	Moderate
5	4.0	Bright
6	4.1	Bright
7	4.1	Bright
8	4.2	Bright
9	4.3	Bright
10	4.3	Bright
11	4.3	Bright
12	4.4	Bright
13	4.4	Bright
14	4.5	Bright
15	4.5	Bright
16	4.6	Bright
17	4.6	Bright
18	4.7	Bright
19	4.7	Bright
20	4.8	Bright
21	4.8	Bright
22	4.9	Bright
23	4.9	Bright
24	5.0	Bright
25	5.0	Bright
26	5.1	Bright
27	5.1	Bright
28	5.2	Bright
29	5.3	Bright
30	5.3	Bright
31	5.4	Bright

Planning a trip in March

Hazard calendar for Windsor

In seasonPeak

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

Windsor'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 March a good time to visit Windsor?

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

5.7

Sightseeing

9th-best month of the year

1.4

Beach & pool

9th-best month of the year

March is a reasonable time to visit Windsor for sightseeing.

What to pack for Windsor in March

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

In March, Windsor sees daytime highs around 63°F and nights near 44°F. Worth packing: a warm layer, rain gear and sun protection. About 10 days see rain.

a warm layerrain gearsun protection

Sea temperature near Windsor in March

The nearest coast averages about 53°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 21 mi away) is warmest in September at about 55°F and coldest in May near 51°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)	53	53	53	51	51	51	53	54	55	55	54	53
Comfort	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing	Bracing

	Sea temperature (°F)	Comfort
Jan	53	Bracing
Feb	53	Bracing
Mar	53	Bracing
Apr	51	Bracing
May	51	Bracing
Jun	51	Bracing
Jul	53	Bracing
Aug	54	Bracing
Sep	55	Bracing
Oct	55	Bracing
Nov	54	Bracing
Dec	53	Bracing

UV index in Windsor 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 Windsor peaks around June 23 at about 10 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near December 17 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)	2	4	5	6	9	10	10	9	6	5	2	2
Level	Moderate	Moderate	Moderate	High	Very high	Extreme	Extreme	Very high	High	High	Moderate	Low

	UV index (midday)	Level
Jan	2	Moderate
Feb	4	Moderate
Mar	5	Moderate
Apr	6	High
May	9	Very high
Jun	10	Extreme
Jul	10	Extreme
Aug	9	Very high
Sep	6	High
Oct	5	High
Nov	2	Moderate
Dec	2	Low

Air quality in Windsor 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 Windsor is worst in September — around 24 µg/m³ PM2.5 (moderate), about 4.1× the cleanest month (June, 6 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)	8	9	9	7	7	6	9	17	24	16	9	7
Level	Good	Good	Good	Good	Good	Good	Good	Moderate	Moderate	Moderate	Good	Good

	PM2.5 (µg/m³)	Level
Jan	8	Good
Feb	9	Good
Mar	9	Good
Apr	7	Good
May	7	Good
Jun	6	Good
Jul	9	Good
Aug	17	Moderate
Sep	24	Moderate
Oct	16	Moderate
Nov	9	Good
Dec	7	Good

Location & terrain

Where is Windsor?

Windsor sits at 38.5°N, 122.8°W, 118 ft above sea level, in United States. The nearest listed city is Santa Rosa, 9.3 mi away.

Topography around Windsor

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

Within 2 miles, the terrain around Windsor has only modest variations in elevation — a maximum elevation change of 476 ft around an average of 144 ft above sea level; within 10 miles, large variations in elevation — a maximum elevation change of 1,969 ft; within 50 miles, very significant variations in elevation — a maximum elevation change of 6,266 ft.

The land around Windsor is covered by trees (35%), artificial surfaces (28%) and grassland (26%) within 2 miles, trees (57%) and grassland (27%) within 10 miles, and trees (42%), grassland (27%) and water (24%) within 50 miles.

2 miles

476 ft

trees 35%

10 miles

1,969 ft

trees 57%

50 miles

6,266 ft

trees 42%

treesgrasslandcroplandartificial surfaceswater

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

March weather nearby: Santa Rosa 9.3 mi · Rohnert Park 16 mi · Agua Caliente 24 mi · Petaluma 24 mi · Clearlake 30 mi · Novato 33 mi · Napa 34 mi · American Canyon 40 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 Windsor (38.5471°, -122.8164°, elevation 118 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	60	42
2	61	42
3	61	42
4	61	42
5	61	42
6	62	43
7	62	43
8	62	43
9	62	43
10	62	43
11	63	43
12	63	44
13	63	44
14	63	44
15	63	44
16	63	44
17	63	44
18	63	44
19	63	44
20	63	44
21	63	44
22	63	44
23	63	44
24	64	44
25	64	44
26	64	44
27	64	44
28	64	44
29	64	44
30	64	44
31	64	44

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

	Rain chance (%)
1	34
2	33
3	33
4	33
5	32
6	32
7	32
8	31
9	31
10	30
11	30
12	30
13	29
14	29
15	30
16	30
17	30
18	30
19	30
20	30
21	30
22	30
23	29
24	29
25	28
26	28
27	27
28	26
29	26
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	60	42
2	61	42
3	61	42
4	61	42
5	61	42
6	62	43
7	62	43
8	62	43
9	62	43
10	62	43
11	63	43
12	63	44
13	63	44
14	63	44
15	63	44
16	63	44
17	63	44
18	63	44
19	63	44
20	63	44
21	63	44
22	63	44
23	63	44
24	64	44
25	64	44
26	64	44
27	64	44
28	64	44
29	64	44
30	64	44
31	64	44

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

	Rain chance (%)
1	34
2	33
3	33
4	33
5	32
6	32
7	32
8	31
9	31
10	30
11	30
12	30
13	29
14	29
15	30
16	30
17	30
18	30
19	30
20	30
21	30
22	30
23	29
24	29
25	28
26	28
27	27
28	26
29	26
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	60	42
2	61	42
3	61	42
4	61	42
5	61	42
6	62	43
7	62	43
8	62	43
9	62	43
10	62	43
11	63	43
12	63	44
13	63	44
14	63	44
15	63	44
16	63	44
17	63	44
18	63	44
19	63	44
20	63	44
21	63	44
22	63	44
23	63	44
24	64	44
25	64	44
26	64	44
27	64	44
28	64	44
29	64	44
30	64	44
31	64	44

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

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