Castanhal weather in September
In September, Castanhal sees average daytime highs of 33°C and overnight lows near 23°C, with 34 mm of rain across 8.8 wet days and about 12 hours of daylight. It is the 3rd-warmest and 11th-wettest month of the year here.
Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 33% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 12 hours at the start of September to 12 hours by month's end. Set against the rest of the year, September is Castanhal's 2nd-clearest and 2nd-windiest month. For the whole year in context, see Castanhal's year-round climate.
- Daytime high
- 33°
- 3rd warmest
- Overnight low
- 23°
- 7th coldest
- Rainfall
- 34 mm
- 8.8 wet days
- Daylight
- 12 hours
- 6:06 AM – 6:06 PM
- Cloud cover
- 49%
- 2nd clearest
- Wind
- 10 km/h
- 2nd windiest
- Solar energy
- 6.03 kWh/m²
- Travel score
- 3.6
- out of 10
Castanhal is human settlement in Brazil.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 33°C through the month.
A typical September day in Castanhal reaches about 33°C in the afternoon and slips back to 23°C overnight — a 10°C spread between the day's warmth and the night's chill. On most days the high lands between 32°C and 34°C. Set against its neighbours, September runs on par with August and on par with October.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Avg high (°C) | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Avg low (°C) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 33 | 23 |
| 2 | 33 | 23 |
| 3 | 33 | 23 |
| 4 | 33 | 23 |
| 5 | 33 | 23 |
| 6 | 33 | 23 |
| 7 | 33 | 23 |
| 8 | 33 | 23 |
| 9 | 33 | 23 |
| 10 | 33 | 23 |
| 11 | 33 | 23 |
| 12 | 33 | 23 |
| 13 | 33 | 23 |
| 14 | 33 | 23 |
| 15 | 33 | 23 |
| 16 | 33 | 23 |
| 17 | 33 | 23 |
| 18 | 33 | 23 |
| 19 | 33 | 23 |
| 20 | 33 | 23 |
| 21 | 33 | 23 |
| 22 | 33 | 23 |
| 23 | 33 | 23 |
| 24 | 33 | 23 |
| 25 | 33 | 23 |
| 26 | 33 | 23 |
| 27 | 33 | 23 |
| 28 | 33 | 23 |
| 29 | 33 | 23 |
| 30 | 33 | 23 |
How September really feels in Castanhal
Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Castanhal weather by month
How September compares with the rest of the year at a glance. September is the 3rd-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 31° / 23° | 269 | 27.1 | 12.1 | 2.6 |
| Feb | 30° / 23° | 354 | 26.9 | 12 | 2.5 |
| Mar | 30° / 23° | 456 | 30.5 | 12 | 2.5 |
| Apr | 30° / 23° | 427 | 29.6 | 12 | 2.5 |
| May | 31° / 23° | 278 | 27.7 | 11.9 | 2.7 |
| Jun | 31° / 23° | 120 | 21.4 | 11.9 | 3.1 |
| Jul | 32° / 22° | 91 | 18.1 | 11.9 | 3.5 |
| Aug | 32° / 23° | 51 | 13 | 12 | 3.6 |
| Sep | 33° / 23° | 34 | 8.8 | 12 | 3.6 |
| Oct | 34° / 23° | 34 | 8.1 | 12 | 3.4 |
| Nov | 33° / 24° | 49 | 8.8 | 12.1 | 3.3 |
| Dec | 33° / 24° | 118 | 17.4 | 12.1 | 3.0 |
Cloud cover in September
The sky is clear or mostly clear about 33% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 44% of September, with mostly cloudy or overcast conditions the remaining 23%.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Clearer (%) | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 81 | 80 | 80 | 79 | 79 | 79 | 79 | 78 | 77 | 77 | 77 | 76 | 75 | 75 | 75 | 75 | 74 | 74 | 74 | 74 | 74 | 73 | 73 |
| Cloudier (%) | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 19 | 20 | 20 | 21 | 21 | 21 | 21 | 22 | 23 | 23 | 23 | 24 | 25 | 25 | 25 | 25 | 26 | 26 | 26 | 26 | 26 | 27 | 27 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 81 | 19 |
| 2 | 81 | 19 |
| 3 | 81 | 19 |
| 4 | 81 | 19 |
| 5 | 81 | 19 |
| 6 | 81 | 19 |
| 7 | 81 | 19 |
| 8 | 81 | 19 |
| 9 | 80 | 20 |
| 10 | 80 | 20 |
| 11 | 79 | 21 |
| 12 | 79 | 21 |
| 13 | 79 | 21 |
| 14 | 79 | 21 |
| 15 | 78 | 22 |
| 16 | 77 | 23 |
| 17 | 77 | 23 |
| 18 | 77 | 23 |
| 19 | 76 | 24 |
| 20 | 75 | 25 |
| 21 | 75 | 25 |
| 22 | 75 | 25 |
| 23 | 75 | 25 |
| 24 | 74 | 26 |
| 25 | 74 | 26 |
| 26 | 74 | 26 |
| 27 | 74 | 26 |
| 28 | 74 | 26 |
| 29 | 73 | 27 |
| 30 | 73 | 27 |
Chance of precipitation in September
Castanhal gets around 34 mm of rain over 8.8 wet days in September. The line is the day-by-day chance of measurable precipitation.
Day to day, the chance of measurable rain averages around 30% and peaks near 36% on the wettest days. The odds ease toward the end of the month.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rain chance (%) | 36 | 36 | 35 | 35 | 34 | 33 | 33 | 32 | 31 | 31 | 31 | 30 | 30 | 30 | 29 | 29 | 29 | 29 | 28 | 28 | 28 | 27 | 27 | 27 | 26 | 26 | 26 | 25 | 25 | 25 |
| Rain chance (%) | |
|---|---|
| 1 | 36 |
| 2 | 36 |
| 3 | 35 |
| 4 | 35 |
| 5 | 34 |
| 6 | 33 |
| 7 | 33 |
| 8 | 32 |
| 9 | 31 |
| 10 | 31 |
| 11 | 31 |
| 12 | 30 |
| 13 | 30 |
| 14 | 30 |
| 15 | 29 |
| 16 | 29 |
| 17 | 29 |
| 18 | 29 |
| 19 | 28 |
| 20 | 28 |
| 21 | 28 |
| 22 | 27 |
| 23 | 27 |
| 24 | 27 |
| 25 | 26 |
| 26 | 26 |
| 27 | 26 |
| 28 | 25 |
| 29 | 25 |
| 30 | 25 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 98% of days. Sticky, muggy-or-worse air turns up on roughly 100% of them.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Muggy (%) | 0 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 |
| Oppressive (%) | 98 | 97 | 97 | 97 | 97 | 98 | 98 | 98 | 98 | 98 | 98 | 97 | 97 | 97 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 98 | 99 | 98 | 98 | 98 | 98 | 98 | 98 |
| Miserable (%) | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|
| 1 | 0 | 98 | 2 |
| 2 | 1 | 97 | 2 |
| 3 | 1 | 97 | 2 |
| 4 | 1 | 97 | 2 |
| 5 | 1 | 97 | 2 |
| 6 | 1 | 98 | 1 |
| 7 | 1 | 98 | 1 |
| 8 | 1 | 98 | 1 |
| 9 | 1 | 98 | 1 |
| 10 | 1 | 98 | 1 |
| 11 | 1 | 98 | 1 |
| 12 | 2 | 97 | 1 |
| 13 | 2 | 97 | 1 |
| 14 | 2 | 97 | 1 |
| 15 | 1 | 98 | 1 |
| 16 | 1 | 98 | 1 |
| 17 | 1 | 98 | 1 |
| 18 | 1 | 98 | 1 |
| 19 | 1 | 98 | 1 |
| 20 | 1 | 98 | 1 |
| 21 | 1 | 98 | 1 |
| 22 | 1 | 98 | 1 |
| 23 | 1 | 98 | 1 |
| 24 | 1 | 99 | 0 |
| 25 | 2 | 98 | 0 |
| 26 | 2 | 98 | 0 |
| 27 | 2 | 98 | 0 |
| 28 | 2 | 98 | 0 |
| 29 | 2 | 98 | 0 |
| 30 | 2 | 98 | 0 |
Wind in September
Winds average 10 km/h in September.
Across September, daily wind ranges from about 9 km/h on the calmest days to 10 km/h at its breeziest. It stays fairly steady from day to day.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Wind speed (km/h) | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 |
| Feels | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm | calm |
| Wind speed (km/h) | Feels | |
|---|---|---|
| 1 | 9 | calm |
| 2 | 10 | calm |
| 3 | 10 | calm |
| 4 | 10 | calm |
| 5 | 10 | calm |
| 6 | 10 | calm |
| 7 | 10 | calm |
| 8 | 10 | calm |
| 9 | 10 | calm |
| 10 | 10 | calm |
| 11 | 10 | calm |
| 12 | 10 | calm |
| 13 | 10 | calm |
| 14 | 10 | calm |
| 15 | 10 | calm |
| 16 | 10 | calm |
| 17 | 10 | calm |
| 18 | 10 | calm |
| 19 | 10 | calm |
| 20 | 10 | calm |
| 21 | 10 | calm |
| 22 | 10 | calm |
| 23 | 10 | calm |
| 24 | 10 | calm |
| 25 | 10 | calm |
| 26 | 10 | calm |
| 27 | 10 | calm |
| 28 | 10 | calm |
| 29 | 10 | calm |
| 30 | 10 | calm |
Sunrise & sunset in September
Daylight runs from about 12 hours at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 0 minutes over September. Sunrise moves from 6:12 AM to 6:01 AM, and sunset from 6:11 PM to 6:01 PM.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight (h) | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Sunrise (AM) | 6:12 | 6:12 | 6:11 | 6:11 | 6:11 | 6:10 | 6:10 | 6:09 | 6:09 | 6:09 | 6:08 | 6:08 | 6:07 | 6:07 | 6:07 | 6:06 | 6:06 | 6:05 | 6:05 | 6:05 | 6:04 | 6:04 | 6:03 | 6:03 | 6:03 | 6:02 | 6:02 | 6:01 | 6:01 | 6:01 |
| Sunset (PM) | 6:11 | 6:10 | 6:10 | 6:10 | 6:09 | 6:09 | 6:09 | 6:08 | 6:08 | 6:08 | 6:07 | 6:07 | 6:07 | 6:06 | 6:06 | 6:06 | 6:05 | 6:05 | 6:05 | 6:04 | 6:04 | 6:04 | 6:03 | 6:03 | 6:03 | 6:03 | 6:02 | 6:02 | 6:02 | 6:01 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 12.0 | 6:12 | 6:11 |
| 2 | 12.0 | 6:12 | 6:10 |
| 3 | 12.0 | 6:11 | 6:10 |
| 4 | 12.0 | 6:11 | 6:10 |
| 5 | 12.0 | 6:11 | 6:09 |
| 6 | 12.0 | 6:10 | 6:09 |
| 7 | 12.0 | 6:10 | 6:09 |
| 8 | 12.0 | 6:09 | 6:08 |
| 9 | 12.0 | 6:09 | 6:08 |
| 10 | 12.0 | 6:09 | 6:08 |
| 11 | 12.0 | 6:08 | 6:07 |
| 12 | 12.0 | 6:08 | 6:07 |
| 13 | 12.0 | 6:07 | 6:07 |
| 14 | 12.0 | 6:07 | 6:06 |
| 15 | 12.0 | 6:07 | 6:06 |
| 16 | 12.0 | 6:06 | 6:06 |
| 17 | 12.0 | 6:06 | 6:05 |
| 18 | 12.0 | 6:05 | 6:05 |
| 19 | 12.0 | 6:05 | 6:05 |
| 20 | 12.0 | 6:05 | 6:04 |
| 21 | 12.0 | 6:04 | 6:04 |
| 22 | 12.0 | 6:04 | 6:04 |
| 23 | 12.0 | 6:03 | 6:03 |
| 24 | 12.0 | 6:03 | 6:03 |
| 25 | 12.0 | 6:03 | 6:03 |
| 26 | 12.0 | 6:02 | 6:03 |
| 27 | 12.0 | 6:02 | 6:02 |
| 28 | 12.0 | 6:01 | 6:02 |
| 29 | 12.0 | 6:01 | 6:02 |
| 30 | 12.0 | 6:01 | 6:01 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 6.03 kWh/m².
For context, solar energy here swings from a low near 4.05 kWh/m² to a high of 6.13 kWh/m² in October across the year — September's 6.03 kWh/m² sits near the top of that range.
| 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Solar energy (kWh/m²) | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 5.9 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.0 | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.1 | 6.2 | 6.2 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 5.9 | Bright |
| 2 | 5.9 | Bright |
| 3 | 5.9 | Bright |
| 4 | 5.9 | Bright |
| 5 | 5.9 | Bright |
| 6 | 5.9 | Bright |
| 7 | 5.9 | Bright |
| 8 | 6.0 | Bright |
| 9 | 6.0 | Bright |
| 10 | 6.0 | Bright |
| 11 | 6.0 | Bright |
| 12 | 6.0 | Bright |
| 13 | 6.0 | Bright |
| 14 | 6.0 | Intense |
| 15 | 6.0 | Intense |
| 16 | 6.0 | Intense |
| 17 | 6.0 | Intense |
| 18 | 6.0 | Intense |
| 19 | 6.1 | Intense |
| 20 | 6.1 | Intense |
| 21 | 6.1 | Intense |
| 22 | 6.1 | Intense |
| 23 | 6.1 | Intense |
| 24 | 6.1 | Intense |
| 25 | 6.1 | Intense |
| 26 | 6.1 | Intense |
| 27 | 6.1 | Intense |
| 28 | 6.1 | Intense |
| 29 | 6.2 | Intense |
| 30 | 6.2 | Intense |
Hazard calendar for Castanhal
None of Castanhal's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Castanhal's monsoon runs January–May, when most of the year's rain falls.
Is September a good time to visit Castanhal?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Castanhal. The water and warmth also suit a beach or pool day.
What to pack for Castanhal in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Castanhal sees daytime highs around 33°C and nights near 23°C. Pack light clothes and sun protection. Worth having: rain gear. About 9 days see rain.
Sea temperature near Castanhal in September
The nearest coast averages about 29°C in September — the other half of the beach question. The full-year curve and swim-comfort zones are below.
The sea at the nearest coast (about 53 km away) is warmest in June at about 29°C and coldest in March near 28°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) | 29 | 28 | 28 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 | 29 |
| Comfort | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical | Tropical |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 29 | Tropical |
| Feb | 28 | Tropical |
| Mar | 28 | Tropical |
| Apr | 29 | Tropical |
| May | 29 | Tropical |
| Jun | 29 | Tropical |
| Jul | 29 | Tropical |
| Aug | 29 | Tropical |
| Sep | 29 | Tropical |
| Oct | 29 | Tropical |
| Nov | 29 | Tropical |
| Dec | 29 | Tropical |
UV index in Castanhal in September
Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Castanhal peaks around March 15 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 18 at about 10 (extreme).
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) | 13 | 14 | 15 | 14 | 12 | 11 | 10 | 10 | 12 | 12 | 10 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 14 | Extreme |
| Mar | 15 | Extreme |
| Apr | 14 | Extreme |
| May | 12 | Extreme |
| Jun | 11 | Extreme |
| Jul | 10 | Extreme |
| Aug | 10 | Extreme |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 10 | Extreme |
| Dec | 11 | Extreme |
Air quality in Castanhal in September
Average fine-particle pollution (PM2.5) through the year — so you can see where September falls, not just the annual average.
Air quality in Castanhal is worst in November — around 26 µg/m³ PM2.5 (moderate), about 2.7× the cleanest month (June, 10 µg/m³).
Modeled monthly averages (CAMS reanalysis, 2015–2024).
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| PM2.5 (µg/m³) | 18 | 21 | 21 | 17 | 11 | 10 | 11 | 13 | 14 | 17 | 26 | 20 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 18 | Moderate |
| Feb | 21 | Moderate |
| Mar | 21 | Moderate |
| Apr | 17 | Moderate |
| May | 11 | Good |
| Jun | 10 | Good |
| Jul | 11 | Good |
| Aug | 13 | Moderate |
| Sep | 14 | Moderate |
| Oct | 17 | Moderate |
| Nov | 26 | Moderate |
| Dec | 20 | Moderate |
Where is Castanhal?
Castanhal sits at 1.3°S, 47.9°W, 46 m above sea level, in Brazil. The nearest listed city is Santa Isabel do Pará, 26 km away.
Topography around Castanhal
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Castanhal.
Within 3 km, the terrain around Castanhal has only modest variations in elevation — a maximum elevation change of 46 m around an average of 40 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 69 m; within 80 km, only modest variations in elevation — a maximum elevation change of 96 m.
The land around Castanhal is covered by artificial surfaces (56%) and grassland (25%) within 3 km, trees (60%) and grassland (36%) within 16 km, and trees (65%) 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 Castanhal (-1.2939°, -47.9264°, elevation 46 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. Sea temperatures are the NOAA OISST v2.1 1991–2020 monthly climatology (public domain), sampled at the nearest ocean point. UV index is derived from CAMS (Copernicus Atmosphere Monitoring Service) clear-sky UV data — contains modified Copernicus Atmosphere Monitoring Service information. Monthly air-quality (PM2.5) seasonality is from the CAMS EAC4 reanalysis (Copernicus Atmosphere Monitoring Service), scaled to the WHO annual mean where available. Topography is sampled from the Copernicus DEM GLO-90 elevation model (© ESA/Airbus) and ESA WorldCover 2021 land cover (CC BY 4.0).