Santo Antônio do Içá in Fall

In fall (March, April and May), Santo Antônio do Içá sees average daytime highs around 30°C and overnight lows near 23°C, with 950 mm of rain over about 86 wet days across the season. It is the 3rd-warmest season and the wettest season of the year.

Across fall, daytime highs hold fairly steady around 30°C. The sky is clear or mostly clear about 1% of the time across fall, and the air most often feels miserable.

Fall is Santo Antônio do Içá's 2nd-best season to visit on our travel score. Santo Antônio do Içá has little temperature swing across the year, so its calendar seasons blur — the season framing matters less here than for a place with four distinct seasons. For the whole year in context, see Santo Antônio do Içá's year-round climate.

Avg daytime high: 30°C; 3rd-warmest season
Avg overnight low: 23°C
Rainfall: 950 mm; 86 wet days
Avg wind: 4 km/h
Travel score: 2.7; 2nd-best season
Months: Mar · Apr · May

← Summer Santo Antônio do Içá year-round climate Winter →

Spring Summer Fall Winter

Temperature in Santo Antônio do Içá in Fall

Average highAverage lowShaded bands: 10–90% of days

Across fall, daytime highs hold fairly steady around 30°C.

A typical fall day in Santo Antônio do Içá reaches about 30°C and drops to 23°C overnight. The warmest of the three months is March, the coolest May.

How fall really feels in Santo Antônio do Içá

Once humidity and wind are folded in, fall brings about 92 days that feel above 32°C and 0 that feel at or below 0°C.

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 fall is heat — humidity pushes the afternoon "feels like" well above the raw temperature.

Santo Antônio do Içá weather by month

How the three fall months (March, April and May) compare with the rest of the year — the season's months are highlighted.

Month	High / Low (°C)	Rainfall (mm)	Wet days	Daylight (hours)	Travel score
Jan	30° / 24°	277	28.3	12.2	2.7
Feb	30° / 24°	276	25.5	12.1	2.7
Mar	30° / 24°	323	29.1	12	2.6
Apr	30° / 23°	326	28.2	11.9	2.7
May	30° / 23°	301	28.8	11.9	2.9
Jun	29° / 23°	206	26.1	11.8	3.2
Jul	30° / 22°	154	24.8	11.8	3.4
Aug	31° / 23°	130	23.3	11.9	3.3
Sep	31° / 23°	143	23	12	2.9
Oct	31° / 24°	188	25.6	12.1	2.7
Nov	31° / 24°	219	26.2	12.1	2.6
Dec	31° / 24°	266	28.8	12.2	2.6

Cloud cover in Fall

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 1% of the time across fall.

Chance of precipitation in Fall

Any precipitation

Santo Antônio do Içá gets around 950 mm of rain over 86 wet days across fall. The line is the day-by-day chance of measurable precipitation.

Humidity in Fall

DryComfortableHumidMuggyOppressiveMiserable

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

Wind in Fall

Winds average 4 km/h across fall.

Sunrise & sunset in Fall

DaylightNight

Daylight runs from about 12 h 06 min in early March to 11 h 48 min by late May. The lit band spans sunrise to sunset each day.

Solar energy in Fall

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day across fall, about 4.1 kWh/m².

Planning a trip in fall

Is fall a good time to visit Santo Antônio do Içá?

Our two travel scores rate fall for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.

2.7

Sightseeing

2nd-best month of the year

3.7

Beach & pool

4th-best month of the year

fall is a weaker month for outdoor sightseeing in Santo Antônio do Içá.

What to pack for Santo Antônio do Içá in Fall

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

In fall, Santo Antônio do Içá sees daytime highs around 30°C and nights near 23°C. Pack light clothes and rain gear. About 86 days see rain.

light clothesrain gear

UV index in Santo Antônio do Içá in Fall

LowModerateHighVery highExtreme

Clear-sky midday UV across fall averages around 14 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Santo Antônio do Içá peaks around March 10 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 9 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)	15	15	15	14	13	11	10	10	10	12	13	12
Level	Extreme	Extreme	Extreme	Extreme	Extreme	Extreme	Very high	Very high	Very high	Extreme	Extreme	Extreme

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

Air quality in Santo Antônio do Içá in Fall

GoodModeratePoorUnhealthyVery unhealthy

Average fine-particle pollution (PM2.5) through the year — so you can see where fall falls, not just the annual average.

Air quality in Santo Antônio do Içá is worst in August — around 18 µg/m³ PM2.5 (moderate), about 1.9× the cleanest month (June, 9 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)	14	15	16	13	10	9	11	18	16	13	13	12
Level	Moderate	Moderate	Moderate	Moderate	Good	Good	Good	Moderate	Moderate	Moderate	Moderate	Moderate

	PM2.5 (µg/m³)	Level
Jan	14	Moderate
Feb	15	Moderate
Mar	16	Moderate
Apr	13	Moderate
May	10	Good
Jun	9	Good
Jul	11	Good
Aug	18	Moderate
Sep	16	Moderate
Oct	13	Moderate
Nov	13	Moderate
Dec	12	Moderate

Location & terrain

Where is Santo Antônio do Içá?

Santo Antônio do Içá sits at 3.1°S, 67.9°W, 68 m above sea level, in Brazil. The nearest listed city is Tonantins, 30 km away.

Topography around Santo Antônio do Içá

How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Santo Antônio do Içá.

Within 3 km, the terrain around Santo Antônio do Içá has only modest variations in elevation — a maximum elevation change of 61 m around an average of 65 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 73 m; within 80 km, only modest variations in elevation — a maximum elevation change of 92 m.

The land around Santo Antônio do Içá is covered by trees (52%) and water (38%) within 3 km, trees (82%) within 16 km, and trees (96%) within 80 km.

3 km

61 m

trees 52%

16 km

73 m

trees 82%

80 km

92 m

trees 96%

treesgrasslandartificial surfaceswater

← Summer Santo Antônio do Içá year-round climate Winter →

Fall weather nearby: Tonantins 30 km · São Paulo de Olivença 108 km · Fonte Boa 215 km · Carauari 229 km · Leticia 254 km · Tabatinga 255 km · Benjamin Constant 272 km · Atalaia do Norte 287 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 Santo Antônio do Içá (-3.1022°, -67.9397°, elevation 68 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.