Castanhal climate
Castanhal (Pará, Brazil) has a tropical rainforest climate (Köppen Af). The average temperature over the year is 26 °C80 °F, and about 2,622 mm103 in of precipitation falls in an average year.
Temperature by month
Precipitation by month
Castanhal climate table
| Month | High °C°F | Low °C°F | Mean °C°F | Precip. mmin |
|---|---|---|---|---|
| Jan | 2985 | 2373 | 2679 | 29512 |
| Feb | 2883 | 2373 | 2678 | 36814 |
| Mar | 2882 | 2374 | 2678 | 44017 |
| Apr | 2882 | 2374 | 2678 | 39215 |
| May | 2883 | 2374 | 2678 | 28411 |
| Jun | 2983 | 2373 | 2678 | 1897.4 |
| Jul | 2984 | 2373 | 2678 | 1465.8 |
| Aug | 3085 | 2373 | 2679 | 1024.0 |
| Sep | 3289 | 2373 | 2781 | 763.0 |
| Oct | 3392 | 2374 | 2883 | 763.0 |
| Nov | 3493 | 2374 | 2984 | 873.4 |
| Dec | 3289 | 2374 | 2882 | 1676.6 |
| Year | 3493 | 2373 | 2680 | 2,622103 |
“Year” row: highest monthly high, lowest monthly low, annual mean and annual total.
| Month | Humid. | Cloud | Solar | Daylight |
|---|---|---|---|---|
| Jan | 87% | 78% | 4.6 | 12:11 |
| Feb | 92% | 87% | 4.4 | 12:09 |
| Mar | 93% | 86% | 4.5 | 12:07 |
| Apr | 93% | 84% | 4.6 | 12:05 |
| May | 92% | 70% | 4.9 | 12:04 |
| Jun | 91% | 54% | 5.3 | 12:03 |
| Jul | 89% | 45% | 5.5 | 12:03 |
| Aug | 87% | 36% | 5.9 | 12:04 |
| Sep | 79% | 35% | 6.0 | 12:06 |
| Oct | 71% | 46% | 5.8 | 12:09 |
| Nov | 69% | 52% | 5.5 | 12:11 |
| Dec | 77% | 67% | 4.9 | 12:12 |
Humid. = average relative humidity at 2 m; cloud = average cloud amount; solar = average daily solar energy reaching the ground in kWh/m² (all-sky); daylight in hours:minutes, calculated for the 15th of each month.
What the climate of Castanhal is like
The warmest month is November, with an average high of 34 °C93 °F and a low of 23 °C74 °F. The coldest is February, when highs average 28 °C83 °F and lows 23 °C73 °F. Seasonal differences are small — just 3.1 °C5.6 °F between the warmest and the coolest month.
It is very wet, receiving about 2,622 mm103 in of precipitation per year. The wettest three-month stretch is February–April, which brings 46% of the annual total. The wettest month is March (440 mm17 in), the driest is September (76 mm3.0 in).
Relative humidity ranges from 69% in November to 93% in April. The clearest skies (lowest average cloud amount, 35%) are typical of September. Average wind speed near the ground ranges from 1 km/h (1 mph) in April to 2 km/h (1 mph) in October.
Best time to visit Castanhal
Based on these averages, the most comfortable months for sightseeing and outdoor activities are September: average highs of 32 °C89 °F to 32 °C89 °F with 76 mm3.0 in to 76 mm3.0 in of precipitation per month.
The most challenging month is March, which is very wet (440 mm17 in) and humid (93% relative humidity).
Comfort score: months are ranked by how close they come to an average high of 21–28 °C (70–82 °F), lows above 5 °C (41 °F), little precipitation and moderate humidity. The best-ranked months of each place are recommended, even where none meets all of these. These are general rules of thumb applied to long-term averages.
What to pack for Castanhal
- Wetter months (January–May) — highs 2882 to 29 °C85 °F, lows around 23 °C73 °F, about 356 mm14 in of precipitation a month. Pack light summer clothes such as T-shirts, shorts or light dresses and a good rain jacket or umbrella and quick-drying shoes.
- Drier months (June–December) — highs 2983 to 34 °C93 °F, lows around 23 °C73 °F, about 121 mm4.7 in of precipitation a month. Pack very light, breathable clothing, a sun hat and plenty of water and an umbrella or light rain jacket.
How Castanhal compares
Compared with Ananindeua, about 50 km to the west, Castanhal has practically the same average temperature and receives a similar amount of precipitation.
Of the 223 places in Brazil covered by World Climates, Castanhal is the 49th warmest by annual mean temperature and the 2nd wettest by annual precipitation. See all of them on the Brazil climate page.
Places in other countries with the most similar temperature and rainfall pattern (seasons shifted for the other hemisphere where needed): Bacolod City (Philippines, Af), Kendari (Indonesia, Af) and Pagadian (Philippines, Af).
Nearby places
- Ananindeua 50 km · 27 °C80 °F · 2,622 mm103 in
- Belém 67 km · 27 °C81 °F · 2,569 mm101 in
- Bragança 132 km · 27 °C80 °F · 2,499 mm98 in
- Paragominas 200 km · 27 °C80 °F · 1,799 mm71 in
- Cametá 204 km · 27 °C81 °F · 2,513 mm99 in
- Breves 287 km · 27 °C80 °F · 2,418 mm95 in
- Tucuruí 337 km · 27 °C81 °F · 1,902 mm75 in
- Macapá 379 km · 27 °C80 °F · 2,068 mm81 in
Frequently asked questions
What is the warmest month in Castanhal?
November is the warmest month in Castanhal, with an average high of 34 °C (93 °F) and an average low of 23 °C (74 °F).
What is the coldest month in Castanhal?
February is the coldest month, with an average high of 28 °C (83 °F) and an average low of 23 °C (73 °F).
When does it rain the most in Castanhal?
March is the wettest month with about 440 mm (17.3 in) of precipitation; September is the driest with about 76 mm (3.0 in).
What is the best time to visit Castanhal?
Judging by long-term averages, the most comfortable months are September.
About this data
All figures are 25-year averages (January 2001 – December 2025) from the NASA POWER project. Temperature, humidity, wind and precipitation come from the MERRA-2 reanalysis (precipitation is the bias-corrected MERRA-2 product), cloud and solar values from CERES satellite data. They describe a grid cell of roughly 50–70 km, not a single weather station, so they can differ from airport records — most of all on coasts, in mountains and for rainfall. Average highs and lows are the monthly mean temperature plus/minus half of the average daily temperature range. Counts of rainy days are not part of this dataset.