União weather in March

In March, União sees average daytime highs of 31°C and overnight lows near 23°C, with 363 mm of rain across 27 wet days and about 12 hours of daylight. It is the 11th-warmest and 1st-wettest month of the year here.

Day-to-day highs hold fairly steady near 31°C through the month. The sky is clear or mostly clear about 6% of the time in March, and the air most often feels oppressive.

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

Daytime high: 31°; 11th warmest
Overnight low: 23°; 4th coldest
Rainfall: 363 mm; 27 wet days
Daylight: 12 hours; 6:00 AM – 6:02 PM
Cloud cover: 79%; 12th clearest
Wind: 5 km/h; 11th windiest
Solar energy: 4.93 kWh/m²
Travel score: 2.6; out of 10

União is settlement in Uniao, Piaui, Brazil.

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

← February União 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

Day-to-day highs hold fairly steady near 31°C through the month.

A typical March day in União reaches about 31°C in the afternoon and slips back to 23°C overnight — a 8°C spread between the day's warmth and the night's chill. On most days the high lands between 29°C and 33°C. Set against its neighbours, March runs on par with February and on par with 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)	32	32	32	32	32	32	32	32	32	32	32	32	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31	31
Avg low (°C)	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23	23

	Avg high (°C)	Avg low (°C)
1	32	23
2	32	23
3	32	23
4	32	23
5	32	23
6	32	23
7	32	23
8	32	23
9	32	23
10	32	23
11	32	23
12	32	23
13	31	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23
31	31	23

How March really feels in União

Once humidity and wind are folded in, March averages 31 days that feel above 32°C and 0 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

wind chill below the day's low

The story in March is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

União weather by month

How March compares with the rest of the year at a glance. March is the 11th-warmest and 1st-wettest month here — the current month is highlighted below.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	33° / 24°	228	21.8	12.2	2.6
Feb	32° / 23°	296	22.2	12.2	2.7
Mar	31° / 23°	363	27	12	2.6
Apr	31° / 23°	325	24.6	11.9	2.8
May	32° / 23°	143	15.1	11.8	3.6
Jun	33° / 23°	23	4.6	11.7	4.2
Jul	34° / 23°	12	1.7	11.8	4.0
Aug	35° / 24°	2	0.5	11.9	3.2
Sep	36° / 24°	3	0.6	12	2.3
Oct	37° / 25°	10	1.5	12.1	1.8
Nov	36° / 25°	35	4.5	12.2	2.0
Dec	35° / 25°	84	9.7	12.3	2.4

Cloud cover in March

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 6% of the time in March, the cloudiest month of the year.

Beyond those clear spells, partly cloudy skies cover about 13% of March, with mostly cloudy or overcast conditions the remaining 81%.

	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 (%)	24	24	23	23	23	23	22	22	22	22	22	22	22	20	19	19	19	18	17	17	17	16	16	15	15	15	15	15	15	15	16
Cloudier (%)	76	76	77	77	77	77	78	78	78	78	78	78	78	80	81	81	81	82	83	83	83	84	84	85	85	85	85	85	85	85	84

	Clearer (%)	Cloudier (%)
1	24	76
2	24	76
3	23	77
4	23	77
5	23	77
6	23	77
7	22	78
8	22	78
9	22	78
10	22	78
11	22	78
12	22	78
13	22	78
14	20	80
15	19	81
16	19	81
17	19	81
18	18	82
19	17	83
20	17	83
21	17	83
22	16	84
23	16	84
24	15	85
25	15	85
26	15	85
27	15	85
28	15	85
29	15	85
30	15	85
31	16	84

Chance of precipitation in March

Any precipitation

União gets around 363 mm of rain over 27 wet days in March, the wettest month. The line is the day-by-day chance of measurable precipitation.

Day to day, the chance of measurable rain averages around 87% and peaks near 90% on the wettest days. The odds climb 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 (%)	82	82	82	82	83	83	83	84	84	85	85	86	86	87	87	88	88	88	89	89	90	90	90	90	90	90	90	90	90	90	90

	Rain chance (%)
1	82
2	82
3	82
4	82
5	83
6	83
7	83
8	84
9	84
10	85
11	85
12	86
13	86
14	87
15	87
16	88
17	88
18	88
19	89
20	89
21	90
22	90
23	90
24	90
25	90
26	90
27	90
28	90
29	90
30	90
31	90

Humidity in March

DryComfortableHumidMuggyOppressiveMiserable

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

By dew point, March lands in the oppressive band about 55% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.

	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
Oppressive (%)	65	64	63	63	62	61	60	59	58	57	57	56	55	55	55	54	54	54	54	55	54	54	54	54	53	52	51	50	49	47	46
Miserable (%)	35	36	37	37	38	39	40	41	42	43	43	44	45	45	45	46	46	46	46	45	46	46	46	46	47	48	49	50	51	53	54

	Oppressive (%)	Miserable (%)
1	65	35
2	64	36
3	63	37
4	63	37
5	62	38
6	61	39
7	60	40
8	59	41
9	58	42
10	57	43
11	57	43
12	56	44
13	55	45
14	55	45
15	55	45
16	54	46
17	54	46
18	54	46
19	54	46
20	55	45
21	54	46
22	54	46
23	54	46
24	54	46
25	53	47
26	52	48
27	51	49
28	50	50
29	49	51
30	47	53
31	46	54

Wind in March

Winds average 5 km/h in March.

Across March, daily wind ranges from about 5 km/h on the calmest days to 5 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)	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 (km/h)	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 12 h 06 min at the start of March to 12 hours by month's end. The lit band spans sunrise to sunset each day.

Days shrink by about 6 minutes over March. Sunrise moves from 6:02 AM to 5:57 AM, and sunset from 6:08 PM to 5:55 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)	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.1	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0	12.0
Sunrise (AM)	6:02	6:02	6:02	6:02	6:02	6:01	6:01	6:01	6:01	6:01	6:01	6:01	6:01	6:00	6:00	6:00	6:00	6:00	6:00	5:59	5:59	5:59	5:59	5:59	5:59	5:58	5:58	5:58	5:58	5:58	5:57
Sunset (PM)	6:08	6:07	6:07	6:07	6:06	6:06	6:06	6:05	6:05	6:04	6:04	6:04	6:03	6:03	6:02	6:02	6:02	6:01	6:01	6:00	6:00	5:59	5:59	5:59	5:58	5:58	5:57	5:57	5:56	5:56	5:55

	Daylight (h)	Sunrise (AM)	Sunset (PM)
1	12.1	6:02	6:08
2	12.1	6:02	6:07
3	12.1	6:02	6:07
4	12.1	6:02	6:07
5	12.1	6:02	6:06
6	12.1	6:01	6:06
7	12.1	6:01	6:06
8	12.1	6:01	6:05
9	12.1	6:01	6:05
10	12.1	6:01	6:04
11	12.1	6:01	6:04
12	12.0	6:01	6:04
13	12.0	6:01	6:03
14	12.0	6:00	6:03
15	12.0	6:00	6:02
16	12.0	6:00	6:02
17	12.0	6:00	6:02
18	12.0	6:00	6:01
19	12.0	6:00	6:01
20	12.0	5:59	6:00
21	12.0	5:59	6:00
22	12.0	5:59	5:59
23	12.0	5:59	5:59
24	12.0	5:59	5:59
25	12.0	5:59	5:58
26	12.0	5:58	5:58
27	12.0	5:58	5:57
28	12.0	5:58	5:57
29	12.0	5:58	5:56
30	12.0	5:58	5:56
31	12.0	5:57	5:55

Solar energy in March

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day in March, about 4.93 kWh/m².

For context, solar energy here swings from a low near 4.76 kWh/m² to a high of 6.71 kWh/m² in October across the year — March's 4.93 kWh/m² sits near the bottom.

	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)	5.1	5.1	5.1	5.1	5.1	5.1	5.1	5.1	5.1	5.1	5.0	5.0	5.0	5.0	5.0	4.9	4.9	4.9	4.9	4.9	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8	4.8
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	5.1	Bright
2	5.1	Bright
3	5.1	Bright
4	5.1	Bright
5	5.1	Bright
6	5.1	Bright
7	5.1	Bright
8	5.1	Bright
9	5.1	Bright
10	5.1	Bright
11	5.0	Bright
12	5.0	Bright
13	5.0	Bright
14	5.0	Bright
15	5.0	Bright
16	4.9	Bright
17	4.9	Bright
18	4.9	Bright
19	4.9	Bright
20	4.9	Bright
21	4.8	Bright
22	4.8	Bright
23	4.8	Bright
24	4.8	Bright
25	4.8	Bright
26	4.8	Bright
27	4.8	Bright
28	4.8	Bright
29	4.8	Bright
30	4.8	Bright
31	4.8	Bright

Planning a trip in March

Hazard calendar for União

In seasonPeak

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

União's monsoon runs January–April, when most of the year's rain falls.

Monsoon

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is March a good time to visit União?

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

2.6

Sightseeing

7th-best month of the year

3.9

Beach & pool

12th-best month of the year

March is a weaker month for outdoor sightseeing in União.

What to pack for União in March

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

In March, União sees daytime highs around 31°C and nights near 23°C. Pack light clothes and rain gear. Worth having: sun protection. About 27 days see rain.

light clothesrain gearsun protection

UV index in União in March

LowModerateHighVery highExtreme

Clear-sky midday UV in March peaks around 15 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in União peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 at about 10 (very high).

The index reaches 3 or more — the level where the WHO recommends sun protection — every month of the year.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
UV index (midday)	13	14	15	13	11	10	10	10	12	12	11	11
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Extreme	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	13	Extreme
Feb	14	Extreme
Mar	15	Extreme
Apr	13	Extreme
May	11	Extreme
Jun	10	Very high
Jul	10	Very high
Aug	10	Very high
Sep	12	Extreme
Oct	12	Extreme
Nov	11	Extreme
Dec	11	Extreme

Air quality in União 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 União is worst in November — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (June, 10 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)	15	16	14	13	12	10	14	20	17	22	22	18
Level	Moderate	Moderate	Moderate	Moderate	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	15	Moderate
Feb	16	Moderate
Mar	14	Moderate
Apr	13	Moderate
May	12	Good
Jun	10	Good
Jul	14	Moderate
Aug	20	Moderate
Sep	17	Moderate
Oct	22	Moderate
Nov	22	Moderate
Dec	18	Moderate

Location & terrain

Where is União?

União sits at 4.6°S, 42.9°W, 60 m above sea level, in Brazil. The nearest listed city is José de Freitas, 37 km away.

Topography around União

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

Within 3 km, the terrain around União has only modest variations in elevation — a maximum elevation change of 96 m around an average of 54 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 139 m; within 80 km, significant variations in elevation — a maximum elevation change of 318 m.

The land around União is covered by grassland (40%) and trees (24%) within 3 km, trees (58%) and grassland (23%) within 16 km, and trees (66%) within 80 km.

3 km

96 m

grassland 40%

16 km

139 m

trees 58%

80 km

318 m

trees 66%

treesshrubsgrasslandcroplandartificial surfacesbare terrainwater

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

March weather nearby: José de Freitas 37 km · Coelho Neto 40 km · Miguel Alves 47 km · Teresina 56 km · Timon 57 km · Caxias 62 km · Altos 67 km · Aldeias Altas 67 km

Brazil travel facts

Travel advisory: Level 2; Exercise Increased Caution
Power plugs: Type C / N; 127 / 220 V · 60 Hz
Prices: ≈ 46% of US; price level, 2025
GDP per capita: $10,713; 2025
Happiness: 6.6 / 10; World Happiness, 2025
Safe drinking water: 89%; of population, 2024
Homicide rate: 19.3; per 100k, 2023
Road deaths: 16; per 100k/yr, 2019
Income group: Upper middle; World Bank
English: Low; EF EPI 482
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 União (-4.5858°, -42.8642°, elevation 60 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. 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 (°C)	Avg low (°C)
1	32	23
2	32	23
3	32	23
4	32	23
5	32	23
6	32	23
7	32	23
8	32	23
9	32	23
10	32	23
11	32	23
12	32	23
13	31	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23
31	31	23

	Clearer (%)	Cloudier (%)
1	24	76
2	24	76
3	23	77
4	23	77
5	23	77
6	23	77
7	22	78
8	22	78
9	22	78
10	22	78
11	22	78
12	22	78
13	22	78
14	20	80
15	19	81
16	19	81
17	19	81
18	18	82
19	17	83
20	17	83
21	17	83
22	16	84
23	16	84
24	15	85
25	15	85
26	15	85
27	15	85
28	15	85
29	15	85
30	15	85
31	16	84

	Rain chance (%)
1	82
2	82
3	82
4	82
5	83
6	83
7	83
8	84
9	84
10	85
11	85
12	86
13	86
14	87
15	87
16	88
17	88
18	88
19	89
20	89
21	90
22	90
23	90
24	90
25	90
26	90
27	90
28	90
29	90
30	90
31	90

	Oppressive (%)	Miserable (%)
1	65	35
2	64	36
3	63	37
4	63	37
5	62	38
6	61	39
7	60	40
8	59	41
9	58	42
10	57	43
11	57	43
12	56	44
13	55	45
14	55	45
15	55	45
16	54	46
17	54	46
18	54	46
19	54	46
20	55	45
21	54	46
22	54	46
23	54	46
24	54	46
25	53	47
26	52	48
27	51	49
28	50	50
29	49	51
30	47	53
31	46	54

	Avg high (°C)	Avg low (°C)
1	32	23
2	32	23
3	32	23
4	32	23
5	32	23
6	32	23
7	32	23
8	32	23
9	32	23
10	32	23
11	32	23
12	32	23
13	31	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23
31	31	23

	Clearer (%)	Cloudier (%)
1	24	76
2	24	76
3	23	77
4	23	77
5	23	77
6	23	77
7	22	78
8	22	78
9	22	78
10	22	78
11	22	78
12	22	78
13	22	78
14	20	80
15	19	81
16	19	81
17	19	81
18	18	82
19	17	83
20	17	83
21	17	83
22	16	84
23	16	84
24	15	85
25	15	85
26	15	85
27	15	85
28	15	85
29	15	85
30	15	85
31	16	84

	Rain chance (%)
1	82
2	82
3	82
4	82
5	83
6	83
7	83
8	84
9	84
10	85
11	85
12	86
13	86
14	87
15	87
16	88
17	88
18	88
19	89
20	89
21	90
22	90
23	90
24	90
25	90
26	90
27	90
28	90
29	90
30	90
31	90

	Oppressive (%)	Miserable (%)
1	65	35
2	64	36
3	63	37
4	63	37
5	62	38
6	61	39
7	60	40
8	59	41
9	58	42
10	57	43
11	57	43
12	56	44
13	55	45
14	55	45
15	55	45
16	54	46
17	54	46
18	54	46
19	54	46
20	55	45
21	54	46
22	54	46
23	54	46
24	54	46
25	53	47
26	52	48
27	51	49
28	50	50
29	49	51
30	47	53
31	46	54

	Avg high (°C)	Avg low (°C)
1	32	23
2	32	23
3	32	23
4	32	23
5	32	23
6	32	23
7	32	23
8	32	23
9	32	23
10	32	23
11	32	23
12	32	23
13	31	23
14	31	23
15	31	23
16	31	23
17	31	23
18	31	23
19	31	23
20	31	23
21	31	23
22	31	23
23	31	23
24	31	23
25	31	23
26	31	23
27	31	23
28	31	23
29	31	23
30	31	23
31	31	23

	Clearer (%)	Cloudier (%)
1	24	76
2	24	76
3	23	77
4	23	77
5	23	77
6	23	77
7	22	78
8	22	78
9	22	78
10	22	78
11	22	78
12	22	78
13	22	78
14	20	80
15	19	81
16	19	81
17	19	81
18	18	82
19	17	83
20	17	83
21	17	83
22	16	84
23	16	84
24	15	85
25	15	85
26	15	85
27	15	85
28	15	85
29	15	85
30	15	85
31	16	84

	Rain chance (%)
1	82
2	82
3	82
4	82
5	83
6	83
7	83
8	84
9	84
10	85
11	85
12	86
13	86
14	87
15	87
16	88
17	88
18	88
19	89
20	89
21	90
22	90
23	90
24	90
25	90
26	90
27	90
28	90
29	90
30	90
31	90

	Oppressive (%)	Miserable (%)
1	65	35
2	64	36
3	63	37
4	63	37
5	62	38
6	61	39
7	60	40
8	59	41
9	58	42
10	57	43
11	57	43
12	56	44
13	55	45
14	55	45
15	55	45
16	54	46
17	54	46
18	54	46
19	54	46
20	55	45
21	54	46
22	54	46
23	54	46
24	54	46
25	53	47
26	52	48
27	51	49
28	50	50
29	49	51
30	47	53
31	46	54