Cornwall weather in March

In March, Cornwall sees average daytime highs of 3°C and overnight lows near -6°C, with 76 mm of precipitation across 11.2 wet days and about 11.6 hours of daylight. It is the 9th-warmest and 10th-wettest month of the year here.

Highs climb over the month, from about 0°C in the first days to 7°C by the end. The sky is clear or mostly clear about 20% of the time in March, and the air most often feels dry.

Daylight stretches from about 10 h 48 min at the start of March to 12 h 24 min by month's end. Set against the rest of the year, March is Cornwall's 7th-clearest and 6th-windiest month. For the whole year in context, see Cornwall's year-round climate.

Daytime high: 3°; 9th warmest
Overnight low: -6°; 4th coldest
Precipitation: 76 mm; 11.2 wet days
Daylight: 11 h 36 min; 6:20 AM – 5:57 PM
Cloud cover: 70%; 7th clearest
Wind: 12 km/h; 6th windiest
Solar energy: 3.75 kWh/m²
Travel score: 0.2; out of 10

Cornwall is city in Ontario, Canada.

Air quality: Good; PM2.5 6 µg/m³ · 2019
Density: 793/km²; people per km²
Founded: 1784

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

← February Cornwall 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 0°C in the first days to 7°C by the end.

A typical March day in Cornwall reaches about 3°C in the afternoon and slips back to -6°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between -4°C and 11°C. Set against its neighbours, March runs about 6°C warmer than February and about 9°C 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 (°C)	0	0	0	1	1	1	1	1	2	2	2	2	2	3	3	3	3	4	4	4	5	5	5	5	6	6	6	7	7	7	7
Avg low (°C)	-9	-9	-9	-9	-9	-8	-8	-8	-8	-7	-7	-7	-7	-7	-6	-6	-6	-6	-5	-5	-5	-5	-4	-4	-4	-3	-3	-3	-2	-2	-2

	Avg high (°C)	Avg low (°C)
1	0	-9
2	0	-9
3	0	-9
4	1	-9
5	1	-9
6	1	-8
7	1	-8
8	1	-8
9	2	-8
10	2	-7
11	2	-7
12	2	-7
13	2	-7
14	3	-7
15	3	-6
16	3	-6
17	3	-6
18	4	-6
19	4	-5
20	4	-5
21	5	-5
22	5	-5
23	5	-4
24	5	-4
25	6	-4
26	6	-3
27	6	-3
28	7	-3
29	7	-2
30	7	-2
31	7	-2

How March really feels in Cornwall

Once humidity and wind are folded in, March averages 0 days that feel above 32°C and 31 that feel at or below 0°C — the comfort signal a plain temperature reading hides.

Days feeling ≥ 32°C

heat index over the day's high

Days feeling ≤ 0°C

20 feel bitter (≤ -10°C)

The story in March is cold — wind chill drags the overnight "feels like" below the raw low.

Cornwall weather by month

How March compares with the rest of the year at a glance. March is the 9th-warmest and 10th-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Snow days	Daylight (hours)	Travel score
Jan	-4° / -12°	73	11.4	10.5	9	0.0
Feb	-2° / -12°	61	10	8.7	10.1	0.0
Mar	3° / -6°	76	11.2	7	11.6	0.2
Apr	12° / 2°	101	12.1	2.8	13.2	2.8
May	19° / 8°	98	12.2	0.1	14.6	5.6
Jun	24° / 13°	105	12.4	0	15.4	6.3
Jul	26° / 16°	100	12.9	0	15.1	6.2
Aug	25° / 15°	94	11.6	0	13.9	6.6
Sep	21° / 11°	93	10.5	0	12.3	6.4
Oct	13° / 5°	105	12	0.6	10.7	3.6
Nov	6° / -1°	84	12.4	3.7	9.3	0.6
Dec	-0° / -7°	82	12.4	9.3	8.6	0.0

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 20% of the time in March.

Beyond those clear spells, partly cloudy skies cover about 12% of March, with mostly cloudy or overcast conditions the remaining 68%.

	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 (%)	30	29	29	28	28	29	28	28	28	28	29	29	30	31	31	31	32	32	34	34	35	35	35	36	36	35	34	34	33	34	33
Cloudier (%)	70	71	71	72	72	71	72	72	72	72	71	71	70	69	69	69	68	68	66	66	65	65	65	64	64	65	66	66	67	66	67

	Clearer (%)	Cloudier (%)
1	30	70
2	29	71
3	29	71
4	28	72
5	28	72
6	29	71
7	28	72
8	28	72
9	28	72
10	28	72
11	29	71
12	29	71
13	30	70
14	31	69
15	31	69
16	31	69
17	32	68
18	32	68
19	34	66
20	34	66
21	35	65
22	35	65
23	35	65
24	36	64
25	36	64
26	35	65
27	34	66
28	34	66
29	33	67
30	34	66
31	33	67

Chance of precipitation in March

Any precipitationSnow

Cornwall gets around 76 mm of rain and snow over 11.2 wet days in March. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable precipitation averages around 37% and peaks near 39% on the wettest days, and about 7 days bring snow.

	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 (%)	38	38	38	38	39	39	39	39	38	38	38	38	37	37	37	36	36	35	34	34	34	34	34	35	35	36	37	37	38	39	39
Snow chance (%)	30	30	30	30	29	29	29	28	28	27	27	26	26	25	25	24	24	23	22	21	20	19	18	17	17	16	16	16	15	15	14

	Rain chance (%)	Snow chance (%)
1	38	30
2	38	30
3	38	30
4	38	30
5	39	29
6	39	29
7	39	29
8	39	28
9	38	28
10	38	27
11	38	27
12	38	26
13	37	26
14	37	25
15	37	25
16	36	24
17	36	24
18	35	23
19	34	22
20	34	21
21	34	20
22	34	19
23	34	18
24	35	17
25	35	17
26	36	16
27	37	16
28	37	16
29	38	15
30	39	15
31	39	14

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 12 km/h in March.

Across March, daily wind ranges from about 12 km/h on the calmest days to 12 km/h 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 (km/h)	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12	12
Feels	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	light breeze	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm	calm

	Wind speed (km/h)	Feels
1	12	light breeze
2	12	light breeze
3	12	light breeze
4	12	light breeze
5	12	light breeze
6	12	light breeze
7	12	light breeze
8	12	light breeze
9	12	light breeze
10	12	light breeze
11	12	light breeze
12	12	light breeze
13	12	light breeze
14	12	light breeze
15	12	light breeze
16	12	light breeze
17	12	calm
18	12	calm
19	12	calm
20	12	calm
21	12	calm
22	12	calm
23	12	calm
24	12	calm
25	12	calm
26	12	calm
27	12	calm
28	12	calm
29	12	calm
30	12	calm
31	12	calm

Sunrise & sunset in March

DaylightNight

Daylight runs from about 10 h 48 min at the start of March to 12 h 24 min by month's end. The lit band spans sunrise to sunset each day.

Days grow by about 96 minutes over March. Sunrise moves from 6:48 AM to 5:51 AM, and sunset from 5:37 PM to 6:16 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)	10.8	10.9	10.9	11.0	11.0	11.1	11.1	11.2	11.2	11.3	11.3	11.4	11.4	11.5	11.6	11.6	11.7	11.7	11.8	11.8	11.9	11.9	12.0	12.0	12.1	12.1	12.2	12.3	12.3	12.4	12.4
Sunrise (AM)	6:48	6:46	6:44	6:42	6:41	6:39	6:37	6:35	6:33	6:32	6:30	6:28	6:26	6:24	6:22	6:20	6:18	6:16	6:15	6:13	6:11	6:09	6:07	6:05	6:03	6:01	5:59	5:57	5:55	5:53	5:51
Sunset (PM)	5:37	5:38	5:39	5:41	5:42	5:44	5:45	5:46	5:48	5:49	5:50	5:52	5:53	5:54	5:56	5:57	5:58	6:00	6:01	6:02	6:03	6:05	6:06	6:07	6:09	6:10	6:11	6:13	6:14	6:15	6:16

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	10.8	6:48	5:37
2	10.9	6:46	5:38
3	10.9	6:44	5:39
4	11.0	6:42	5:41
5	11.0	6:41	5:42
6	11.1	6:39	5:44
7	11.1	6:37	5:45
8	11.2	6:35	5:46
9	11.2	6:33	5:48
10	11.3	6:32	5:49
11	11.3	6:30	5:50
12	11.4	6:28	5:52
13	11.4	6:26	5:53
14	11.5	6:24	5:54
15	11.6	6:22	5:56
16	11.6	6:20	5:57
17	11.7	6:18	5:58
18	11.7	6:16	6:00
19	11.8	6:15	6:01
20	11.8	6:13	6:02
21	11.9	6:11	6:03
22	11.9	6:09	6:05
23	12.0	6:07	6:06
24	12.0	6:05	6:07
25	12.1	6:03	6:09
26	12.1	6:01	6:10
27	12.2	5:59	6:11
28	12.3	5:57	6:13
29	12.3	5:55	6:14
30	12.4	5:53	6:15
31	12.4	5:51	6:16

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 3.75 kWh/m².

For context, solar energy here swings from a low near 1.2 kWh/m² to a high of 5.91 kWh/m² in June across the year — March's 3.75 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)	3.1	3.1	3.2	3.2	3.3	3.3	3.4	3.4	3.4	3.5	3.5	3.6	3.6	3.7	3.7	3.8	3.8	3.9	3.9	4.0	4.0	4.0	4.0	4.1	4.1	4.1	4.1	4.2	4.2	4.2	4.2
Level	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright	Bright

	Solar energy (kWh/m²)	Level
1	3.1	Moderate
2	3.1	Moderate
3	3.2	Moderate
4	3.2	Moderate
5	3.3	Moderate
6	3.3	Moderate
7	3.4	Moderate
8	3.4	Moderate
9	3.4	Moderate
10	3.5	Moderate
11	3.5	Moderate
12	3.6	Moderate
13	3.6	Moderate
14	3.7	Moderate
15	3.7	Moderate
16	3.8	Moderate
17	3.8	Moderate
18	3.9	Moderate
19	3.9	Moderate
20	4.0	Moderate
21	4.0	Moderate
22	4.0	Bright
23	4.0	Bright
24	4.1	Bright
25	4.1	Bright
26	4.1	Bright
27	4.1	Bright
28	4.2	Bright
29	4.2	Bright
30	4.2	Bright
31	4.2	Bright

Planning a trip in March

Is March a good time to visit Cornwall?

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

0.2

Sightseeing

9th-best month of the year

0.0

Beach & pool

8th-best month of the year

March is a weaker month for outdoor sightseeing in Cornwall.

What to pack for Cornwall in March

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

In March, Cornwall sees daytime highs around 3°C and nights near -6°C. Pack a warm layer and a heavy coat. Worth having: rain gear. About 11 days see rain.

a warm layera heavy coatrain gear

UV index in Cornwall in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 3 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Cornwall peaks around July 14 at about 8 (very high) — sunscreen and a hat are worth it in the middle of the day. It bottoms out near January 10 at about 1 (low).

The index reaches 3 or more — the level where the WHO recommends sun protection — in 7 months of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	1	2	3	4	6	6	8	4	5	3	2	1
Level	Low	Low	Moderate	Moderate	High	High	Very high	Moderate	High	Moderate	Low	Low

	UV index (midday)	Level
Jan	1	Low
Feb	2	Low
Mar	3	Moderate
Apr	4	Moderate
May	6	High
Jun	6	High
Jul	8	Very high
Aug	4	Moderate
Sep	5	High
Oct	3	Moderate
Nov	2	Low
Dec	1	Low

Location & terrain

Where is Cornwall?

Cornwall sits at 45.0°N, 74.7°W, 59 m above sea level, in Canada. The nearest listed city is Les Coteaux, 49 km away.

Topography around Cornwall

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Cornwall.

Within 3 km, the terrain around Cornwall has only modest variations in elevation — a maximum elevation change of 40 m around an average of 58 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 100 m; within 80 km, large variations in elevation — a maximum elevation change of 1,164 m.

The land around Cornwall is covered by trees (35%) and artificial surfaces (26%) within 3 km, trees (51%) within 16 km, and trees (58%) and cropland (28%) within 80 km.

3 km

40 m

trees 35%

16 km

100 m

trees 51%

80 km

1,164 m

trees 58%

treesgrasslandcroplandartificial surfaceswaterwetland

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

March weather nearby: Les Coteaux 49 km · Salaberry-de-Valleyfield 53 km · Saint-Lazare 63 km · Vaudreuil-Dorion 69 km · Clarence-Rockland 74 km · Orléans 78 km · Fallingbrook 78 km · Gloucester 80 km

Canada travel facts

Travel advisory: Level 1; Exercise Normal Precautions
Power plugs: Type A / B; 120 V · 60 Hz
Prices: ≈ 83% of US; price level, 2025
GDP per capita: $55,698; 2025
Happiness: 6.7 / 10; World Happiness, 2025
Safe drinking water: 97%; of population, 2024
Homicide rate: 2; per 100k, 2023
Road deaths: 5.3; 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 Cornwall (45.0181°, -74.7281°, elevation 59 m), 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. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. 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 (°C)	Avg low (°C)
1	0	-9
2	0	-9
3	0	-9
4	1	-9
5	1	-9
6	1	-8
7	1	-8
8	1	-8
9	2	-8
10	2	-7
11	2	-7
12	2	-7
13	2	-7
14	3	-7
15	3	-6
16	3	-6
17	3	-6
18	4	-6
19	4	-5
20	4	-5
21	5	-5
22	5	-5
23	5	-4
24	5	-4
25	6	-4
26	6	-3
27	6	-3
28	7	-3
29	7	-2
30	7	-2
31	7	-2

	Clearer (%)	Cloudier (%)
1	30	70
2	29	71
3	29	71
4	28	72
5	28	72
6	29	71
7	28	72
8	28	72
9	28	72
10	28	72
11	29	71
12	29	71
13	30	70
14	31	69
15	31	69
16	31	69
17	32	68
18	32	68
19	34	66
20	34	66
21	35	65
22	35	65
23	35	65
24	36	64
25	36	64
26	35	65
27	34	66
28	34	66
29	33	67
30	34	66
31	33	67

	Rain chance (%)	Snow chance (%)
1	38	30
2	38	30
3	38	30
4	38	30
5	39	29
6	39	29
7	39	29
8	39	28
9	38	28
10	38	27
11	38	27
12	38	26
13	37	26
14	37	25
15	37	25
16	36	24
17	36	24
18	35	23
19	34	22
20	34	21
21	34	20
22	34	19
23	34	18
24	35	17
25	35	17
26	36	16
27	37	16
28	37	16
29	38	15
30	39	15
31	39	14

	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 (°C)	Avg low (°C)
1	0	-9
2	0	-9
3	0	-9
4	1	-9
5	1	-9
6	1	-8
7	1	-8
8	1	-8
9	2	-8
10	2	-7
11	2	-7
12	2	-7
13	2	-7
14	3	-7
15	3	-6
16	3	-6
17	3	-6
18	4	-6
19	4	-5
20	4	-5
21	5	-5
22	5	-5
23	5	-4
24	5	-4
25	6	-4
26	6	-3
27	6	-3
28	7	-3
29	7	-2
30	7	-2
31	7	-2

	Clearer (%)	Cloudier (%)
1	30	70
2	29	71
3	29	71
4	28	72
5	28	72
6	29	71
7	28	72
8	28	72
9	28	72
10	28	72
11	29	71
12	29	71
13	30	70
14	31	69
15	31	69
16	31	69
17	32	68
18	32	68
19	34	66
20	34	66
21	35	65
22	35	65
23	35	65
24	36	64
25	36	64
26	35	65
27	34	66
28	34	66
29	33	67
30	34	66
31	33	67

	Rain chance (%)	Snow chance (%)
1	38	30
2	38	30
3	38	30
4	38	30
5	39	29
6	39	29
7	39	29
8	39	28
9	38	28
10	38	27
11	38	27
12	38	26
13	37	26
14	37	25
15	37	25
16	36	24
17	36	24
18	35	23
19	34	22
20	34	21
21	34	20
22	34	19
23	34	18
24	35	17
25	35	17
26	36	16
27	37	16
28	37	16
29	38	15
30	39	15
31	39	14

	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 (°C)	Avg low (°C)
1	0	-9
2	0	-9
3	0	-9
4	1	-9
5	1	-9
6	1	-8
7	1	-8
8	1	-8
9	2	-8
10	2	-7
11	2	-7
12	2	-7
13	2	-7
14	3	-7
15	3	-6
16	3	-6
17	3	-6
18	4	-6
19	4	-5
20	4	-5
21	5	-5
22	5	-5
23	5	-4
24	5	-4
25	6	-4
26	6	-3
27	6	-3
28	7	-3
29	7	-2
30	7	-2
31	7	-2

	Clearer (%)	Cloudier (%)
1	30	70
2	29	71
3	29	71
4	28	72
5	28	72
6	29	71
7	28	72
8	28	72
9	28	72
10	28	72
11	29	71
12	29	71
13	30	70
14	31	69
15	31	69
16	31	69
17	32	68
18	32	68
19	34	66
20	34	66
21	35	65
22	35	65
23	35	65
24	36	64
25	36	64
26	35	65
27	34	66
28	34	66
29	33	67
30	34	66
31	33	67

	Rain chance (%)	Snow chance (%)
1	38	30
2	38	30
3	38	30
4	38	30
5	39	29
6	39	29
7	39	29
8	39	28
9	38	28
10	38	27
11	38	27
12	38	26
13	37	26
14	37	25
15	37	25
16	36	24
17	36	24
18	35	23
19	34	22
20	34	21
21	34	20
22	34	19
23	34	18
24	35	17
25	35	17
26	36	16
27	37	16
28	37	16
29	38	15
30	39	15
31	39	14

	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