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Porto União weather by month
Historical averages 2016–2025 · not a forecast
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When is the best time to visit Porto União?
For a warm holiday, the best week has been 25–31 December (Weather Index 89). Favourable start dates for a 7-day trip run from 20 December to 2 January. December to March are warmest (27°C), July is driest and November to February have the most sun.
- Warmest
- December to March 27°C
- Coolest
- June 19°C
- Driest
- July 17% rain-day chance
- Wettest
- January 65% rain-day chance
- Sunniest
- November to February 9 hours a day
A rain day has 1 mm or more, snow included, so a short shower counts. Monthly averages below give the amounts.
Monthly averages in Porto União
Porto União historical monthly estimates, 2016–2025. Temperatures and sunshine are daily averages.
| Month | High (°C) | Low (°C) | Rain-day chance (%) | Expected rain days | Precipitation (mm/month) | Sunshine (hours/day) |
|---|---|---|---|---|---|---|
| January | 27.2 | 17.9 | 64.5 | 20.0 | 143.0 | 9.0 |
| February | 27.4 | 17.7 | 56.4 | 15.8 | 109.2 | 9.2 |
| March | 26.5 | 17.1 | 45.5 | 14.1 | 104.3 | 8.2 |
| April | 23.9 | 14.2 | 28.0 | 8.4 | 71.5 | 7.6 |
| May | 20.8 | 11.3 | 31.9 | 9.9 | 88.7 | 6.8 |
| June | 19.0 | 9.4 | 29.7 | 8.9 | 82.9 | 6.6 |
| July | 19.6 | 8.4 | 17.1 | 5.3 | 44.6 | 7.6 |
| August | 20.7 | 9.4 | 23.9 | 7.4 | 95.2 | 7.7 |
| September | 23.6 | 12.6 | 33.3 | 10.0 | 91.3 | 8.1 |
| October | 23.4 | 14.0 | 51.3 | 15.9 | 165.0 | 6.8 |
| November | 25.3 | 15.2 | 42.7 | 12.8 | 117.0 | 8.8 |
| December | 27.1 | 17.0 | 53.5 | 16.6 | 143.9 | 9.4 |
Each month averages its own days. Precipitation includes snow. About the data
Sources
Open-Meteo · 1 Jan 2016 – 31 Dec 2025
- Open-Meteo Historical Weather API
- Local days, 2016–2025, every year weighted equally. Each weekly chart averages its own seven days, without smoothing.
- Shading shows the 10th–90th percentile of past days, not forecast confidence.
- A rain day has at least 1 mm, snow included. The last weekly period has eight days.
- Wind is the average daytime (10:00–18:00) maximum, not gusts. Daylight is calculated from latitude. Missing readings stay blank.
- Mugginess (dew point) comes from the original daily summaries, on UTC days.
- The live two-week forecast comes from the Open-Meteo Weather Forecast API. The Weather Index does not use it.