Best time to visit Petrópolis
The best time to visit Petrópolis is May–September, judged on twenty years of weather records and the events worth going for.
Petrópolis, Rio de Janeiro, Brazil
°C
mm
- Average daily high and low
- Precipitation
- Good month
- Best month
- Made good or best by an event
| Month | Average daily high | Average daily low | Precipitation | Verdict |
|---|---|---|---|---|
| January | 29.2 °C / 85 °F | 21.1 °C / 70 °F | 311 mm / 12.2 in | neither best nor good |
| February | 29.8 °C / 86 °F | 21.1 °C / 70 °F | 239 mm / 9.4 in | neither best nor good |
| March | 28.7 °C / 84 °F | 20.5 °C / 69 °F | 216 mm / 8.5 in | neither best nor good |
| April | 26.8 °C / 80 °F | 18.7 °C / 66 °F | 110 mm / 4.3 in | good month |
| May | 24.8 °C / 77 °F | 16 °C / 61 °F | 55 mm / 2.2 in | best month |
| June | 24.2 °C / 76 °F | 15.1 °C / 59 °F | 38 mm / 1.5 in | best month |
| July | 24.1 °C / 75 °F | 14.3 °C / 58 °F | 34 mm / 1.3 in | best month |
| August | 24.8 °C / 77 °F | 14.9 °C / 59 °F | 44 mm / 1.7 in | best month |
| September | 26.1 °C / 79 °F | 16.8 °C / 62 °F | 70 mm / 2.7 in | best month |
| October | 26.5 °C / 80 °F | 18.5 °C / 65 °F | 143 mm / 5.6 in | neither best nor good |
| November | 26.5 °C / 80 °F | 19 °C / 66 °F | 243 mm / 9.6 in | neither best nor good |
| December | 28.3 °C / 83 °F | 20.6 °C / 69 °F | 290 mm / 11.4 in | neither best nor good |
Good and best months depend on more than temperature, rain and events. How they are chosen
Each activity on this page has its own good and best months, rated on twenty years of daily weather records. Which measures count, and how much, depends on the activity: humidity for exploring outdoors, wind for the beach, hiking and skiing, snow for skiing alone. Between them, the activities are rated on:
- Daytime highs
- Night-time lows
- How warm it feels
- Humidity
- How much of the day is sunny
- Hours of daylight
- Monthly rainfall
- How many days it rains
- Days of heavy rain
- Wind
- Snowfall and days with snow
- Major events, such as festivals
The chart shows the good and best months for exploring outdoors.
The event icon marks a month that an event lifts to good or best, such as a festival or a natural spectacle. Choose “Weather only” in the toolbar to rate the months on weather alone.
Best months by activity
Exploring outdoors
Mild days and nights, mostly dry and bright. The default for 'when should I go'.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: good
- MMay: best
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: best
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Best
- May–September
- Good
- April
Why these months
April · good
In its favour: share of daylight that is sunny 83%, average daily high 26.8 °C / 80 °F, feels like (high) 30.3 °C / 87 °F, precipitation 110 mm / 4.3 in, average daily low 18.7 °C / 66 °F, days with heavy rain 4 days.
Against: wet days 14.2 days, relative humidity 84%.
May · best
In its favour: feels like (high) 26.9 °C / 80 °F, average daily high 24.8 °C / 77 °F, precipitation 55 mm / 2.2 in, share of daylight that is sunny 81%, days with heavy rain 1.2 days, wet days 9.7 days, average daily low 16 °C / 61 °F.
Against: relative humidity 83%.
June · best
In its favour: feels like (high) 25.7 °C / 78 °F, average daily high 24.2 °C / 76 °F, precipitation 38 mm / 1.5 in, share of daylight that is sunny 82%, days with heavy rain 1 days, wet days 7.5 days, average daily low 15.1 °C / 59 °F.
Against: relative humidity 83%.
July · best
In its favour: feels like (high) 25.2 °C / 77 °F, average daily high 24.1 °C / 75 °F, precipitation 34 mm / 1.3 in, share of daylight that is sunny 80%, wet days 5.7 days, days with heavy rain 0.9 days, average daily low 14.3 °C / 58 °F.
Against: relative humidity 80%.
August · best
In its favour: feels like (high) 26.1 °C / 79 °F, average daily high 24.8 °C / 77 °F, precipitation 44 mm / 1.7 in, share of daylight that is sunny 80%, days with heavy rain 1.4 days, wet days 7.2 days, average daily low 14.9 °C / 59 °F.
Against: relative humidity 78%.
September · best
In its favour: feels like (high) 28.2 °C / 83 °F, share of daylight that is sunny 78%, average daily high 26.1 °C / 79 °F, precipitation 70 mm / 2.7 in, days with heavy rain 2 days, wet days 9.3 days, average daily low 16.8 °C / 62 °F, relative humidity 76%.
Hiking and trekking
Cool enough to climb in, dry enough to enjoy, long enough days.
- JJanuary: neither
- FFebruary: neither
- MMarch: neither
- AApril: neither
- MMay: good
- JJune: best
- JJuly: best
- AAugust: best
- SSeptember: good
- OOctober: neither
- NNovember: neither
- DDecember: neither
- Best
- June–August
- Good
- May, September
Why these months
May · good
In its favour: precipitation 55 mm / 2.2 in, days with heavy rain 1.2 days, average daily high 24.8 °C / 77 °F, wet days 9.7 days, share of daylight that is sunny 81%, daylight per day 11 h, wind (daily max) 8 km/h / 5 mph, average daily low 16 °C / 61 °F.
Against: feels like (high) 26.9 °C / 80 °F.
June · best
In its favour: precipitation 38 mm / 1.5 in, average daily high 24.2 °C / 76 °F, days with heavy rain 1 days, wet days 7.5 days, share of daylight that is sunny 82%, average daily low 15.1 °C / 59 °F, daylight per day 10.8 h, wind (daily max) 9 km/h / 5 mph, feels like (high) 25.7 °C / 78 °F.
July · best
In its favour: precipitation 34 mm / 1.3 in, average daily high 24.1 °C / 75 °F, wet days 5.7 days, days with heavy rain 0.9 days, share of daylight that is sunny 80%, average daily low 14.3 °C / 58 °F, daylight per day 10.9 h, wind (daily max) 9 km/h / 6 mph, feels like (high) 25.2 °C / 77 °F.
August · best
In its favour: precipitation 44 mm / 1.7 in, wet days 7.2 days, days with heavy rain 1.4 days, average daily high 24.8 °C / 77 °F, share of daylight that is sunny 80%, average daily low 14.9 °C / 59 °F, daylight per day 11.4 h, wind (daily max) 10 km/h / 6 mph.
Against: feels like (high) 26.1 °C / 79 °F.
September · good
In its favour: precipitation 70 mm / 2.7 in, days with heavy rain 2 days, wet days 9.3 days, share of daylight that is sunny 78%, daylight per day 12 h, wind (daily max) 11 km/h / 7 mph, average daily low 16.8 °C / 62 °F.
Against: average daily high 26.1 °C / 79 °F, feels like (high) 28.2 °C / 83 °F.
An activity is listed only where it applies: skiing at ski destinations, beach and swimming at beach destinations. The nearest ski area is Los Penitentes, 2853 km away.
Weather averages
Monthly averages over twenty years, 2006–2025. Highs, lows and precipitation are in the chart at the top.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Feels like (high) | 34.3 °C | 35 °C | 33.5 °C | 30.3 °C | 26.9 °C | 25.7 °C | 25.2 °C | 26.1 °C | 28.2 °C | 29.6 °C | 30.2 °C | 33 °C |
| Days with heavy rain | 10.6 days | 8.6 days | 8.1 days | 4 days | 1.2 days | 1 days | 0.9 days | 1.4 days | 2 days | 5 days | 8.8 days | 10.4 days |
| Time rain usually falls | 3 pm | 3 pm | 3 pm | 3 pm | 3 pm | 3 pm | 3 pm | 4 pm | 3 pm | 3 pm | 3 pm | 3 pm |
| Sunshine per day | 9.8 h | 10.3 h | 10 h | 9.6 h | 8.9 h | 8.9 h | 8.7 h | 9.1 h | 9.4 h | 8.8 h | 9.2 h | 9.8 h |
| Relative humidity | 81% | 80% | 83% | 84% | 83% | 83% | 80% | 78% | 76% | 80% | 82% | 82% |
Air quality
Averaged over a shorter period (2022–2025) than the twenty-year averages above, and not counted towards good or best months.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Air pollution (PM2.5) 2022–2025 | 11.9 µg/m³ | 13.6 µg/m³ | 13.9 µg/m³ | 14.6 µg/m³ | 14.5 µg/m³ | 13.8 µg/m³ | 14.7 µg/m³ | 15.5 µg/m³ | 15.8 µg/m³ | 12.5 µg/m³ | 12.4 µg/m³ | 11.1 µg/m³ |
| Air pollution (PM2.5, daily peak) 2022–2025 | 20.2 µg/m³ | 23.8 µg/m³ | 23.3 µg/m³ | 25.2 µg/m³ | 26.4 µg/m³ | 25.1 µg/m³ | 25.1 µg/m³ | 27.2 µg/m³ | 27.3 µg/m³ | 21.1 µg/m³ | 21.1 µg/m³ | 18.9 µg/m³ |
- Good 15 µg/m³ or less
- Fair 15 to 25 µg/m³
- Moderate 25 to 37.5 µg/m³
- Poor 37.5 to 50 µg/m³
- Very poor 50 to 75 µg/m³
- Extremely poor over 75 µg/m³
Each figure is compared with the World Health Organization's guideline for a day's air, 15 µg/m³ or less, and with its interim targets above that. The words are ours: the WHO does not name its steps. The figures are modelled monthly averages, so single days can be well above them. The daily peak is the average of each day's highest hour, shaded on the same scale.