Castelo in Summer
In summer (December, January and February), Castelo sees average daytime highs around 29°C and overnight lows near 20°C, with 479 mm of rain over about 45 wet days across the season. It is the warmest season of the year and the wettest season of the year.
Over the season highs climb from about 27°C in early December to 29°C by late February. The sky is clear or mostly clear about 16% of the time across summer, and the air most often feels muggy.
Summer is Castelo's weakest season of the year to visit on our travel score. For the whole year in context, see Castelo's year-round climate.
- Avg daytime high
- 29°C
- warmest season of the year
- Avg overnight low
- 20°C
- Rainfall
- 479 mm
- 45 wet days
- Avg wind
- 7 km/h
- Travel score
- 4.8
- weakest season of the year
- Months
- Dec · Jan · Feb
Temperature in Castelo in Summer
Over the season highs climb from about 27°C in early December to 29°C by late February.
A typical summer day in Castelo reaches about 29°C and drops to 20°C overnight. The warmest of the three months is February, the coolest December.
Castelo weather by month
How the three summer months (December, January and February) 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 | 29° / 20° | 148 | 14.1 | 13.1 | 4.9 |
| Feb | 29° / 20° | 107 | 11.9 | 12.7 | 4.8 |
| Mar | 28° / 19° | 159 | 16.6 | 12.1 | 5.0 |
| Apr | 27° / 18° | 88 | 13.4 | 11.5 | 6.0 |
| May | 25° / 16° | 43 | 8.6 | 11 | 7.1 |
| Jun | 24° / 14° | 23 | 5.5 | 10.8 | 7.8 |
| Jul | 24° / 14° | 24 | 6 | 10.9 | 7.8 |
| Aug | 24° / 14° | 26 | 6.5 | 11.3 | 7.7 |
| Sep | 26° / 16° | 58 | 9.3 | 11.9 | 6.9 |
| Oct | 26° / 17° | 110 | 12.3 | 12.5 | 6.1 |
| Nov | 26° / 18° | 191 | 17.1 | 13 | 5.2 |
| Dec | 28° / 19° | 224 | 19 | 13.2 | 4.8 |
Cloud cover in Summer
The sky is clear or mostly clear about 16% of the time across summer.
Chance of precipitation in Summer
Castelo gets around 479 mm of rain over 45 wet days across summer. The line is the day-by-day chance of measurable precipitation.
Humidity in Summer
Most of summer feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
Wind in Summer
Winds average 7 km/h across summer.
Sunrise & sunset in Summer
Daylight runs from about 13 h 12 min in early December to 12 h 30 min by late February. The lit band spans sunrise to sunset each day.
Solar energy in Summer
Average shortwave solar energy reaching the ground each day across summer, about 5.8 kWh/m².
Hazard calendar for Castelo
In summer, Castelo overlaps its rainy season season. The full year is below, with each hazard's peak months called out.
Castelo's rainy season runs October–March, when most of the year's rain falls.
Is summer a good time to visit Castelo?
Our two travel scores rate summer for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal), averaged across the three months.
summer is a reasonable time to visit Castelo for sightseeing.
What to pack for Castelo in Summer
From summer's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In summer, Castelo sees daytime highs around 29°C and nights near 20°C. Pack light clothes and rain gear. Worth having: sun protection. About 45 days see rain.
Sea temperature near Castelo in Summer
The nearest coast averages about 24°C across summer — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 66 km away) is warmest in March at about 25°C and coldest in September near 22°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 | 25 | 25 | 25 | 25 | 23 | 23 | 23 | 22 | 23 | 24 | 24 |
| Comfort | Warm | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 24 | Warm |
| Feb | 25 | Warm |
| Mar | 25 | Warm |
| Apr | 25 | Warm |
| May | 25 | Warm |
| Jun | 23 | Refreshing |
| Jul | 23 | Refreshing |
| Aug | 23 | Refreshing |
| Sep | 22 | Refreshing |
| Oct | 23 | Refreshing |
| Nov | 24 | Refreshing |
| Dec | 24 | Warm |
UV index in Castelo in Summer
Clear-sky midday UV across summer 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 Castelo peaks around February 11 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near June 20 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 | 15 | 13 | 10 | 7 | 6 | 7 | 9 | 10 | 12 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | Very high | High | High | Very high | Very high | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 15 | Extreme |
| Mar | 13 | Extreme |
| Apr | 10 | Very high |
| May | 7 | Very high |
| Jun | 6 | High |
| Jul | 7 | High |
| Aug | 9 | Very high |
| Sep | 10 | Very high |
| Oct | 12 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Where is Castelo?
Castelo sits at 20.6°S, 41.2°W, 129 m above sea level, in Brazil. The nearest listed city is Vargem Alta, 20 km away.
Topography around Castelo
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Castelo.
Within 3 km, the terrain around Castelo has large variations in elevation — a maximum elevation change of 768 m around an average of 224 m above sea level; within 16 km, very significant variations in elevation — a maximum elevation change of 1,935 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,841 m.
The land around Castelo is covered by trees (56%) and grassland (37%) within 3 km, trees (53%) and grassland (46%) within 16 km, and trees (50%) and grassland (41%) within 80 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 Castelo (-20.6036°, -41.1847°, elevation 129 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.