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Castanhal Weather & Climate: Best Time to Visit
Average temperatures, rainfall, sunshine and the best time to visit Castanhal.
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Climate overview of Castanhal
The climate in Castanhal, Pará, Brazil, is remarkably consistent, with temperatures year-round averaging 33°C (91°F). The warmest month is October at 35°C (95°F), and the coolest is March at 31°C (88°F).
Rainfall is high, totalling around 2271 mm (89 in) per year. March is the wettest month and October the driest. The city also experiences distinct dry (September to October) and wet (January to May) seasons. August is the sunniest month, averaging 9.0 hours of sunshine per day.
Castanhal Weather by Month
Pick a month to see the average temperature, rainfall and sunshine in Castanhal - and find the best time to visit.
Monthly Temperature in Castanhal
In Castanhal temperatures are generally consistent throughout the year. Average maximum daytime temperatures range from a very warm 35°C (95°F) in October, the warmest time of the year, to a very warm 31°C (88°F) during cooler months like March.
At night, you can expect temperatures ranging from 24°C (75°F) in October to around 23°C (73°F) during March.
Check out our detailed temperature page for more information.
Temperature ranges by month
Rainfall in Castanhal
Castanhal experiences significant rainfall throughout the year, averaging 2271 mm (89 in) of precipitation annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, March it receives heavy rainfall, averaging 433 mm (17 in) of precipitation, recorded across 31 rainy days. In contrast, the driest month October brings less rainfall, with 35 mm (1.4 in) over 21 rainy days. For more details, please visit our Castanhal Precipitation page.
The mean monthly precipitation over the year, including rain, hail, and snow
The average number of days each month with precipitation
Sunshine Hours in Castanhal
Seasonal changes in sunshine hours are quite dramatic in Castanhal. While August receives considerable daily sunshine with up to 9.0 hours, February marks the darkest time of the year, where sunshine is scarce with only 3.4 hours of sunlight per day.
Visit our detailed sunshine hours page for more information.
Monthly hours of sunshine
Data from: Belém, Brazil (62 KM, 39 Miles).
Daily hours of sunshine
Data from: Belém, Brazil (62 KM, 39 Miles).
Humidity in Castanhal by Month
The city experiences its highest humidity in February, reaching 90%. In October, the humidity drops to its lowest level at 80%. What does this mean? Read our detailed page on humidity levels for further details.
Relative humidity over the year
Data from: Belém, Brazil (62 KM, 39 Miles).
Best Time to Visit Castanhal
The most favourable weather available in Castanhal usually occurs in July. Conditions are generally most challenging in January, February, March, April, May, June, August, September, October, November and December.
Monthly ratings reflect general weather comfort, based on daytime temperature and rainfall. Swimming and winter conditions are highlighted separately where relevant.
Jan
very wet
Feb
very wet
Mar
very wet
Apr
very wet
May
very wet
Jun
wet
Jul
mixed
Aug
very hot
Sep
very hot
Oct
very hot
Nov
very hot
Dec
very hot
- Best overall: July
- Warmest weather: August, September, October, November and December
- Most sunshine: August
- Fewest rainy days: July and August
- Wettest months: January, February, March, April and May, when rainfall is highest.
- Seasonal pattern: Distinct dry (September to October) and wet (January to May) seasons
Frequently asked questions about the climate in Castanhal
What is the best time to visit Castanhal?
July typically offers the most optimal weather in Castanhal. In contrast, January, February, March, April, May, June, August, September, October, November and December tend to have less optimal conditions. Castanhal has distinct dry (September to October) and wet (January to May) seasons.
What temperatures can I expect in Castanhal?
Daytime highs range from 31°C (88°F) in March to 35°C (95°F) in October. Nighttime lows range from 23°C (73°F) to 24°C (75°F). Temperatures stay relatively stable year-round.
How much rain does Castanhal get?
Annual rainfall is around 2271 mm (89 in). March is the wettest month with 433 mm (17 in), while October is the driest with 35 mm (1.4 in).
How sunny is Castanhal?
Castanhal receives around 2,237 hours of sunshine per year. August is the sunniest month with 269 hours, while February is the cloudiest with just 102 hours. Overall, Castanhal enjoys abundant sunshine.
Castanhal 3-Day Forecast
Castanhal on the map
Castanhal is highlighted - select any city to see its climate.
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