🇧🇷 Weather in Castanhal
Map Overlays:
Hourly Forecast for Castanhal
17:00
33°
2%
18:00
30°
3%
19:00
28°
6%
20:00
26°
11%
21:00
26°
11%
22:00
26°
11%
23:00
25°
12%
00:00
25°
13%
01:00
24°
20%
02:00
23°
43%
03:00
23°
43%
04:00
23°
43%
05:00
24°
29%
06:00
26°
22%
07:00
28°
16%
08:00
29°
13%
09:00
32°
10%
10:00
34°
7%
11:00
36°
9%
12:00
37°
7%
13:00
38°
9%
14:00
37°
9%
15:00
36°
10%
16:00
33°
57%
14-Day Forecast for Castanhal
2026-10-16
Sunny
40° /
22°
2026-10-17
Overcast
38° /
23°
2026-10-18
Sunny
38° /
21°
2026-10-19
Sunny
38° /
21°
2026-10-20
Sunny
39° /
21°
2026-10-21
Sunny
38° /
22°
2026-10-22
Sunny
38° /
23°
Additional Forecasts for Castanhal
Air Quality
💨 US EPA Index 1 (Good)
CO (Carbon Monoxide) 131.0 μg/m³
O₃ (Ozone) 44.0 μg/m³
NO₂ (Nitrogen Dioxide) 1.1 μg/m³
SO₂ (Sulphur Dioxide) 0.5 μg/m³
PM2.5 (Fine particles) 5.5 μg/m³
PM10 (Coarse particles) 7.5 μg/m³
Historical Weather
Weather Forecasts for Other Cities in Brazil
Weather in Castanhal — FAQ
Answers refreshed each request based on current conditions in Castanhal.
What is the weather like right now in Castanhal?
Right now in Castanhal, Brazil the temperature is 33.3°C (feels like 36.2°C), with partly cloudy. Relative humidity is 47% and wind is 11.2 km/h.
What is today's high and low temperature in Castanhal?
Today's forecast high in Castanhal is 40.5°C and the overnight low is 21.7°C. The diurnal range — high minus low — depends on cloud cover; clear days swing more than overcast ones.
Will it rain in Castanhal today?
The chance of precipitation in Castanhal today is 8%. Forecast accuracy is highest within the next 6 hours and decreases steadily out to 14 days.
How often does the weather here update?
Current observations refresh every 15-60 minutes from the nearest monitoring stations operated by national meteorological agencies. The hourly forecast updates approximately every hour; the 7- and 14-day outlook is recomputed several times per day.
What does 'feels like' temperature mean?
Feels-like (apparent) temperature accounts for humidity, wind chill and direct sunshine — variables that change how the human body perceives heat or cold. On hot, humid days it can be 3-7°C above the actual reading; on cold windy days it can be 5-15°C below.
Why does the temperature in Castanhal differ from nearby cities?
Even short distances can change temperatures noticeably. Castanhal's reading reflects altitude, proximity to large bodies of water, urban heat island effects, and the exact location of the monitoring stations supplying the data. Coastal cities are typically milder and more humid than inland equivalents.