Climate averages 1991–2020
Castro weather
by month.
See how the year changes. January has the highest average daily maximum; April has the lowest average monthly rainfall.
Pleasant-weather months by our simple rule: JulyAugust
Long-term climate patterns, not a forecast for a particular trip.
Across the year Castro averages a daytime high of 22.6°C and a nighttime low of 14.2°C, with about 1,520 mm of rain on roughly 165 days. January is the warmest month (average high 25.3°C) and July the coolest (18.8°C). January is the wettest month with 235 mm; April is the driest with 69 mm.
Months with pleasant weather by a simple rule (average high between 18°C and 29°C, average low of at least 5°C and at most 8 rain days): July and August. This looks at temperature and rain only, not humidity, wind, sea temperature or crowds.
The annual picture
A year in Castro
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Castro climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 25.3°C17.8°C | 17.8°C | 235 | 23.7 | 13.513 h |
| February | 25.2°C17.8°C | 17.8°C | 180 | 21.1 | 12.913 h |
| March | 24.4°C16.9°C | 16.9°C | 133 | 18.0 | 12.212 h |
| April | 23.0°C14.9°C | 14.9°C | 69 | 9.6 | 11.512 h |
| May | 19.8°C11.9°C | 11.9°C | 89 | 8.9 | 10.911 h |
| June | 18.9°C10.8°C | 10.8°C | 93 | 8.1 | 10.611 h |
| July | 18.8°C10.1°C | 10.1°C | 79 | 7.0 | 10.811 h |
| August | 20.7°C10.8°C | 10.8°C | 72 | 7.2 | 11.311 h |
| September | 22.1°C12.5°C | 12.5°C | 127 | 10.4 | 11.912 h |
| October | 23.4°C14.4°C | 14.4°C | 138 | 15.1 | 12.713 h |
| November | 23.9°C15.2°C | 15.2°C | 133 | 16.0 | 13.313 h |
| December | 25.1°C16.9°C | 16.9°C | 172 | 20.2 | 13.614 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
Nearby cities
- Ponta GrossaBrazil · 37 kmHigh 22.4°C · Low 13.6°C · 1,431 mm rain a year
- Telêmaco BorbaBrazil · 80 kmHigh 24.4°C · Low 15.2°C · 1,470 mm rain a year
- Campo LargoBrazil · 89 kmHigh 21.6°C · Low 13.6°C · 1,537 mm rain a year
- Almirante TamandaréBrazil · 92 kmHigh 21.9°C · Low 14.2°C · 1,495 mm rain a year
- Colombo, BrazilBrazil · 97 kmHigh 21.3°C · Low 13.7°C · 1,495 mm rain a year
- CuritibaBrazil · 103 kmHigh 21.8°C · Low 14.1°C · 1,533 mm rain a year
- AraucáriaBrazil · 108 kmHigh 21.9°C · Low 14.0°C · 1,537 mm rain a year
- PinhaisBrazil · 110 kmHigh 21.8°C · Low 14.2°C · 1,533 mm rain a year
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsWhat do the high and low temperatures mean?
We average the daily maximum and daily minimum for each calendar month over 1991–2020. They are not record extremes, a forecast range or temperatures at a fixed time of day.
How is a rain day counted?
A local calendar day (standard time, UTC-3, no daylight saving) with at least 1 mm of total precipitation counts as one rain day. We count these for each year and month, then average across 30 years. The average does not predict which days will be wet.
Where do the numbers come from?
ERA5-Land (temperature) and ERA5 (precipitation) reanalysis from the Copernicus Climate Change Service, read from the Open-Meteo open-data archive. Temperature comes from the 0.1° model cell at -24.80°, -50.00° (2 km from the city centre), adjusted up by 0.2°C for the difference between the city's elevation (986 m) and the cell's (1,021 m). Rain comes from the 0.25° cell at -24.75°, -50.00°. These are model estimates, not weather-station readings; coast, hills and city streets can differ.
Does this page show sunshine, humidity or sea temperature?
No. The data used here contain air temperature and precipitation only. Daylight hours are calculated from the city's latitude (sunrise to sunset), not measured sunshine.