Rio das Ostras in Spring

In spring (September, October and November), Rio das Ostras sees average daytime highs around 27°C and overnight lows near 20°C, with 383 mm of rain over about 40 wet days across the season. It is the 3rd-warmest season and the 2nd-wettest season.

Across spring, daytime highs hold fairly steady around 27°C. The sky is clear or mostly clear about 24% of the time across spring, and the air most often feels muggy.

Spring is Rio das Ostras's 2nd-best season to visit on our travel score. For the whole year in context, see Rio das Ostras's year-round climate.

Avg daytime high: 27°C; 3rd-warmest season
Avg overnight low: 20°C
Rainfall: 383 mm; 40 wet days
Avg wind: 12 km/h
Travel score: 6.0; 2nd-best season
Months: Sep · Oct · Nov

← Winter Rio das Ostras year-round climate Summer →

Spring Summer Fall Winter

Temperature in Rio das Ostras in Spring

Average highAverage lowShaded bands: 10–90% of days

Across spring, daytime highs hold fairly steady around 27°C.

A typical spring day in Rio das Ostras reaches about 27°C and drops to 20°C overnight. The warmest of the three months is November, the coolest September.

How spring really feels in Rio das Ostras

Once humidity and wind are folded in, spring brings about 0 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

spring sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.

Rio das Ostras weather by month

How the three spring months (September, October and November) 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° / 23°	206	16.6	13.2	4.1
Feb	31° / 24°	136	12.7	12.8	4.2
Mar	30° / 23°	172	17.8	12.2	4.3
Apr	28° / 21°	85	12	11.5	5.7
May	26° / 19°	60	9.5	10.9	6.9
Jun	26° / 18°	31	5.9	10.6	7.6
Jul	25° / 18°	29	5.6	10.8	7.8
Aug	26° / 18°	34	6.3	11.2	7.6
Sep	26° / 19°	73	10.1	11.9	6.7
Oct	27° / 20°	108	12	12.5	6.1
Nov	27° / 21°	203	17.5	13.1	5.1
Dec	29° / 23°	222	19	13.4	4.2

Cloud cover in Spring

ClearMostly clearPartly cloudyMostly cloudyOvercast

The sky is clear or mostly clear about 24% of the time across spring.

Chance of precipitation in Spring

Any precipitation

Rio das Ostras gets around 383 mm of rain over 40 wet days across spring. The line is the day-by-day chance of measurable precipitation.

Humidity in Spring

DryComfortableHumidMuggyOppressiveMiserable

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

Wind in Spring

Winds average 12 km/h across spring.

Sunrise & sunset in Spring

DaylightNight

Daylight runs from about 11 h 30 min in early September to 13 h 18 min by late November. The lit band spans sunrise to sunset each day.

Solar energy in Spring

Daily solar energy (kWh/m²)

Average shortwave solar energy reaching the ground each day across spring, about 5.3 kWh/m².

Planning a trip in spring

Hazard calendar for Rio das Ostras

In seasonPeak

In spring, Rio das Ostras overlaps its rainy season season. The full year is below, with each hazard's peak months called out.

Rio das Ostras's rainy season runs October–March, when most of the year's rain falls.

Rainy season

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Is spring a good time to visit Rio das Ostras?

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

6.0

Sightseeing

2nd-best month of the year

6.0

Beach & pool

3rd-best month of the year

spring is a reasonable time to visit Rio das Ostras for sightseeing.

What to pack for Rio das Ostras in Spring

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

In spring, Rio das Ostras sees daytime highs around 27°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 40 days see rain.

light clothesrain gearsun protection

Sea temperature near Rio das Ostras in Spring

The nearest coast averages about 22°C across spring — the other half of the beach question. The full-year curve and swim-comfort zones are below.

The sea at the nearest coast (about 13 km away) is warmest in March at about 25°C and coldest in September near 21°C.

The water stays above 20°C all year — warm enough for a swim any month.

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
Sea temperature (°C)	24	24	25	25	24	23	22	22	21	22	22	24
Comfort	Refreshing	Warm	Warm	Warm	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing	Refreshing

	Sea temperature (°C)	Comfort
Jan	24	Refreshing
Feb	24	Warm
Mar	25	Warm
Apr	25	Warm
May	24	Refreshing
Jun	23	Refreshing
Jul	22	Refreshing
Aug	22	Refreshing
Sep	21	Refreshing
Oct	22	Refreshing
Nov	22	Refreshing
Dec	24	Refreshing

UV index in Rio das Ostras in Spring

LowModerateHighVery highExtreme

Clear-sky midday UV across spring averages around 11 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.

Under clear skies, the midday UV index in Rio das Ostras peaks around January 16 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 11 at about 6 (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)	14	14	13	9	7	6	6	8	8	12	14	14
Level	Extreme	Extreme	Extreme	Very high	High	High	High	Very high	Very high	Extreme	Extreme	Extreme

	UV index (midday)	Level
Jan	14	Extreme
Feb	14	Extreme
Mar	13	Extreme
Apr	9	Very high
May	7	High
Jun	6	High
Jul	6	High
Aug	8	Very high
Sep	8	Very high
Oct	12	Extreme
Nov	14	Extreme
Dec	14	Extreme

Location & terrain

Where is Rio das Ostras?

Rio das Ostras sits at 22.5°S, 41.9°W, 11 m above sea level, in Brazil. The nearest listed city is Macaé, 23 km away.

Topography around Rio das Ostras

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

Within 3 km, the terrain around Rio das Ostras has only modest variations in elevation — a maximum elevation change of 49 m around an average of 4 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 693 m; within 80 km, very significant variations in elevation — a maximum elevation change of 2,215 m.

The land around Rio das Ostras is covered by water (39%) and artificial surfaces (32%) within 3 km, water (45%) and grassland (27%) within 16 km, and water (37%), trees (31%) and grassland (28%) within 80 km.

3 km

49 m

water 39%

16 km

693 m

water 45%

80 km

2,215 m

water 37%

treesgrasslandartificial surfacesbare terrainwaterwetlandmangroves

← Winter Rio das Ostras year-round climate Summer →

Spring weather nearby: Macaé 23 km · Buzios 25 km · Casimiro de Abreu 27 km · São Pedro da Aldeia 38 km · Cabo Frio 41 km · Iguaba Grande 45 km · Silva Jardim 48 km · Arraial do Cabo 50 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 Rio das Ostras (-22.5269°, -41.945°, elevation 11 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.