Castelo, Brazil experiences average highs of 29°C (84°F) and lows of 20°C (68°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Sunshine is abundant, averaging about 9 hours per day. High humidity combined with warm temperatures produces a tropical feel year-round. Average highs have cooled by 0.6°C (1.1°F) across the available records.
Castelo, Brazil Weather & Climate 2026
Monthly climate averages for Castelo, Brazil. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Apr–Sep 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.9/10
Best: May, June, July, August, September
UV Index
7
High
Temperature 29°C / 20°C
Feels Like 32°C / 22°C
Rainy Days 11
Rainfall 90 mm
Sunshine 9 h
Humidity 77%
Wind Speed 10 km/h
Dew Point 20°C
Hottest Month
31°C
January
Avg Low22°C
Rain14days
Coldest Month
16°C
July
Avg High26°C
Rain4days
Driest Month
4days
July
Avg High26°C
Avg Low16°C
Windiest Month
12 km/h
October (Gusts 32)
Worst Time to Visit
Consider avoiding January, February, March, December due to extreme heat, frequent rain, oppressive humidity.
Sun Position
Sunrise 06:20
Daylight 10.9h
Sunset 17:13
Live conditions—
Castelo on the map · live conditions
Castelo, Brazil
- Continent
- Americas
- Country
- Brazil
- City
- Castelo
- Population
- 36.9K
- Coordinates
- -20.60°, -41.18°
Seasonal Breakdown
Spring
Sep–Nov
Avg High 29°C
Avg Low 20°C
Rain 12 days/mo
1/3 best months
Summer
Dec–Feb
Avg High 31°C
Avg Low 22°C
Rain 15 days/mo
Autumn
Mar–May
Avg High 29°C
Avg Low 20°C
Rain 10 days/mo
1/3 best months
Winter
Jun–Aug
Avg High 27°C
Avg Low 16°C
Rain 5 days/mo
3/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 31°C / 22°C . Feb: 31°C / 22°C . Mar: 31°C / 22°C . Apr: 29°C / 20°C . May: 27°C / 18°C . Jun: 27°C / 17°C . Jul: 26°C / 16°C . Aug: 27°C / 17°C . Sep: 29°C / 18°C . Oct: 29°C / 20°C . Nov: 29°C / 20°C . Dec: 30°C / 22°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 164 mm. Feb: 142 mm. Mar: 109 mm. Apr: 68 mm. May: 33 mm. Jun: 19 mm. Jul: 15 mm. Aug: 29 mm. Sep: 43 mm. Oct: 108 mm. Nov: 153 mm. Dec: 193 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 76%. Feb: 77%. Mar: 78%. Apr: 80%. May: 80%. Jun: 77%. Jul: 75%. Aug: 74%. Sep: 71%. Oct: 76%. Nov: 79%. Dec: 80%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 11 km/h . Feb: 10 km/h . Mar: 9 km/h . Apr: 9 km/h . May: 9 km/h . Jun: 9 km/h . Jul: 10 km/h . Aug: 11 km/h . Sep: 11 km/h . Oct: 12 km/h . Nov: 11 km/h . Dec: 11 km/h .
Sunshine
Sunshine
Sunshine: Jan: 10h. Feb: 10h. Mar: 10h. Apr: 9h. May: 9h. Jun: 9h. Jul: 9h. Aug: 9h. Sep: 10h. Oct: 8h. Nov: 9h. Dec: 9h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 8. Feb: UV 9. Mar: UV 8. Apr: UV 7. May: UV 6. Jun: UV 5. Jul: UV 5. Aug: UV 6. Sep: UV 7. Oct: UV 7. Nov: UV 8. Dec: UV 8.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Climate Trends
Average highs have cooled by 0.6°C (1.1°F) across the available records. Average rainfall is trending drier by about 8 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Feb 2025 · 34°C | Jan · 31°C |
| Coldest month | Jul 2025 · 15°C | Jul · 16°C |
| Wettest month | Jan 2025 · 234 mm | Dec · 193 mm |
| Windiest month | Oct 2025 · 13 km/h | Oct · 12 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May best
Excellent June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Fair December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 31°C / 22°C | 36°C / 26°C | 14days (164 mm) Wet | 10h Excellent | 76% Humid | 8.1 Very High | Poor | View Details |
| February | 31°C / 22°C | 36°C / 26°C | 14days (142 mm) Wet | 10h Excellent | 77% Humid | 8.7 Very High | Poor | View Details |
| March | 31°C / 22°C | 36°C / 25°C | 13days (109 mm) Wet | 10.2h Excellent | 78% Humid | 8 Very High | Fair | View Details |
| April | 29°C / 20°C | 32°C / 23°C | 11days (68 mm) Wet | 9.3h Good | 80% Humid | 6.7 High | Good | View Details |
| May best | 27°C / 18°C | 29°C / 20°C | 7days (33 mm) Good | 9h Good | 80% Humid | 5.7 High | Excellent | View Details |
| June best | 27°C / 17°C | 28°C / 18°C | 5days (19 mm) Good | 9h Good | 77% Humid | 5.3 High | Excellent | View Details |
| July best | 26°C / 16°C | 27°C / 17°C | 4days (15 mm) Good | 9.1h Good | 75% Muggy | 5.4 High | Excellent | View Details |
| August best | 27°C / 17°C | 28°C / 17°C | 6days (29 mm) Good | 9h Good | 74% Muggy | 6.2 High | Excellent | View Details |
| September best | 29°C / 18°C | 31°C / 20°C | 7days (43 mm) Good | 9.5h Good | 71% Muggy | 7.2 Very High | Excellent | View Details |
| October | 29°C / 20°C | 32°C / 22°C | 14days (108 mm) Wet | 8.4h Good | 76% Humid | 7.1 Very High | Good | View Details |
| November | 29°C / 20°C | 32°C / 23°C | 16days (153 mm) Wet | 8.7h Good | 79% Humid | 8.2 Very High | Fair | View Details |
| December | 30°C / 22°C | 35°C / 25°C | 18days (193 mm) Wet | 9.4h Good | 80% Humid | 8.4 Very High | Wet | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Castelo are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Castelo, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Castelo is January, with average daytime highs of 31°C (88°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Castelo is July, with average overnight lows of 16°C (61°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Castelo is December, averaging 193mm of precipitation across 18 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Castelo runs through December, November, January, February, with the heaviest rainfall in December. Based on 10-year averages for Castelo.
Castelo receives approximately 112 sunshine hours per year. The sunniest month is March with around 10 hours. Based on climate data for Castelo.
The least favorable months to visit Castelo are January, February, March, December, primarily due to extreme heat, frequent rain, oppressive humidity. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Castelo is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Castelo is 77%, classified as humid. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Average wind speeds in Castelo are 10 km/h (6 mph). The windiest month is October with peak winds reaching 12 km/h (7 mph) (gusts up to 32 km/h / 20 mph).
Castelo averages 4 clear-sky days per month with overall cloud cover around 61%. The clearest skies occur in September.
The annual average dew point in Castelo is 20°C (68°F), which feels muggy and uncomfortable. Expect heavy perspiration during warmer months — stay hydrated and take breaks in air-conditioned spaces.
Castelo has a Tropical Monsoon climate, classified as Am under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Castelo ranges from 22°C (72°F) to 32°C (90°F) on average. Humidity and radiant heat mean it often feels warmer than the thermometer reads, especially in summer months.
Yes, June is a great time to visit Castelo. It earns a climate score of 9.4/10 with Excellent.
For June in Castelo, pack Breathable clothing, Sunscreen (SPF 30+), Sun hat, Sunglasses, Comfortable walking shoes. With average highs of 27°C (80°F) and 5 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
Last updated: