Piraí weather in September
In September, Piraí sees average daytime highs of 26°C and overnight lows near 17°C, with 81 mm of rain across 11.8 wet days and about 11.9 hours of daylight. It is the 8th-warmest and 8th-wettest month of the year here.
Day-to-day highs hold fairly steady near 26°C through the month. The sky is clear or mostly clear about 33% of the time in September, and the air most often feels humid.
Daylight stretches from about 11 h 30 min at the start of September to 12 h 12 min by month's end. Set against the rest of the year, September is Piraí's 6th-clearest and 1st-windiest month. For the whole year in context, see Piraí's year-round climate.
- Daytime high
- 26°
- 8th warmest
- Overnight low
- 17°
- 5th coldest
- Rainfall
- 81 mm
- 11.8 wet days
- Daylight
- 11 h 54 min
- 6:54 AM – 6:46 PM
- Cloud cover
- 60%
- 6th clearest
- Wind
- 7 km/h
- 1st windiest
- Solar energy
- 4.53 kWh/m²
- Travel score
- 6.4
- out of 10
Piraí 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 26°C through the month.
A typical September day in Piraí reaches about 26°C in the afternoon and slips back to 17°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 20°C and 32°C. Set against its neighbours, September runs about 1°C warmer than August and about 1°C cooler than 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) | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 | 26 |
| Avg low (°C) | 16 | 16 | 16 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 17 | 18 | 18 | 18 | 18 | 18 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 26 | 16 |
| 2 | 26 | 16 |
| 3 | 26 | 16 |
| 4 | 26 | 17 |
| 5 | 26 | 17 |
| 6 | 26 | 17 |
| 7 | 26 | 17 |
| 8 | 26 | 17 |
| 9 | 26 | 17 |
| 10 | 26 | 17 |
| 11 | 26 | 17 |
| 12 | 26 | 17 |
| 13 | 26 | 17 |
| 14 | 26 | 17 |
| 15 | 26 | 17 |
| 16 | 26 | 17 |
| 17 | 26 | 17 |
| 18 | 26 | 17 |
| 19 | 26 | 17 |
| 20 | 26 | 17 |
| 21 | 26 | 17 |
| 22 | 26 | 17 |
| 23 | 26 | 17 |
| 24 | 26 | 17 |
| 25 | 26 | 17 |
| 26 | 26 | 18 |
| 27 | 26 | 18 |
| 28 | 26 | 18 |
| 29 | 26 | 18 |
| 30 | 26 | 18 |
How September really feels in Piraí
Once humidity and wind are folded in, September averages 0 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
September sits comfortably in between — no days that feel dangerously hot or drop to a hard freeze once humidity and wind are folded in.
Piraí weather by month
How September compares with the rest of the year at a glance. September is the 8th-warmest and 8th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 29° / 22° | 309 | 23.5 | 13.2 | 3.6 |
| Feb | 30° / 22° | 222 | 19 | 12.8 | 3.8 |
| Mar | 29° / 21° | 225 | 22.6 | 12.2 | 4.1 |
| Apr | 27° / 19° | 117 | 14.5 | 11.5 | 5.8 |
| May | 25° / 17° | 70 | 11.3 | 10.9 | 6.7 |
| Jun | 24° / 16° | 40 | 6.7 | 10.6 | 7.6 |
| Jul | 24° / 15° | 42 | 7.4 | 10.8 | 7.7 |
| Aug | 25° / 16° | 37 | 7 | 11.2 | 7.5 |
| Sep | 26° / 17° | 81 | 11.8 | 11.9 | 6.4 |
| Oct | 27° / 19° | 120 | 15.6 | 12.5 | 5.5 |
| Nov | 27° / 20° | 200 | 20.4 | 13.1 | 4.7 |
| Dec | 28° / 21° | 252 | 23.2 | 13.4 | 4.0 |
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 11% of September, with mostly cloudy or overcast conditions the remaining 56%. Skies tend to cloud over as the month goes on.
| 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 (%) | 59 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 43 | 41 | 40 | 39 | 38 | 37 | 37 | 36 | 34 | 34 | 33 | 32 | 32 | 31 | 31 |
| Cloudier (%) | 41 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 57 | 59 | 60 | 61 | 62 | 63 | 63 | 64 | 66 | 66 | 67 | 68 | 68 | 69 | 69 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 59 | 41 |
| 2 | 59 | 41 |
| 3 | 58 | 42 |
| 4 | 57 | 43 |
| 5 | 56 | 44 |
| 6 | 55 | 45 |
| 7 | 54 | 46 |
| 8 | 53 | 47 |
| 9 | 51 | 49 |
| 10 | 50 | 50 |
| 11 | 49 | 51 |
| 12 | 48 | 52 |
| 13 | 47 | 53 |
| 14 | 46 | 54 |
| 15 | 45 | 55 |
| 16 | 43 | 57 |
| 17 | 41 | 59 |
| 18 | 40 | 60 |
| 19 | 39 | 61 |
| 20 | 38 | 62 |
| 21 | 37 | 63 |
| 22 | 37 | 63 |
| 23 | 36 | 64 |
| 24 | 34 | 66 |
| 25 | 34 | 66 |
| 26 | 33 | 67 |
| 27 | 32 | 68 |
| 28 | 32 | 68 |
| 29 | 31 | 69 |
| 30 | 31 | 69 |
Chance of precipitation in September
Piraí gets around 81 mm of rain over 11.8 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 39% and peaks near 49% on the wettest days. The odds climb 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 (%) | 29 | 29 | 30 | 31 | 31 | 32 | 33 | 33 | 34 | 35 | 35 | 36 | 36 | 37 | 38 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 45 | 46 | 47 | 47 | 48 | 49 | 49 | 49 |
| Rain chance (%) | |
|---|---|
| 1 | 29 |
| 2 | 29 |
| 3 | 30 |
| 4 | 31 |
| 5 | 31 |
| 6 | 32 |
| 7 | 33 |
| 8 | 33 |
| 9 | 34 |
| 10 | 35 |
| 11 | 35 |
| 12 | 36 |
| 13 | 36 |
| 14 | 37 |
| 15 | 38 |
| 16 | 38 |
| 17 | 39 |
| 18 | 40 |
| 19 | 41 |
| 20 | 42 |
| 21 | 43 |
| 22 | 44 |
| 23 | 45 |
| 24 | 46 |
| 25 | 47 |
| 26 | 47 |
| 27 | 48 |
| 28 | 49 |
| 29 | 49 |
| 30 | 49 |
Humidity in September
Most of September feels humid — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the humid band about 47% of days. Sticky, muggy-or-worse air turns up on roughly 17% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Dry (%) | 9 | 9 | 9 | 8 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 5 | 4 | 4 | 5 | 5 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 | 4 |
| Comfortable (%) | 39 | 39 | 38 | 38 | 38 | 37 | 37 | 36 | 35 | 34 | 34 | 33 | 32 | 31 | 30 | 30 | 29 | 28 | 27 | 26 | 26 | 25 | 24 | 23 | 23 | 22 | 21 | 21 | 21 | 20 |
| Humid (%) | 46 | 46 | 46 | 46 | 46 | 47 | 47 | 47 | 48 | 48 | 48 | 48 | 49 | 49 | 49 | 49 | 49 | 49 | 49 | 48 | 48 | 47 | 47 | 47 | 46 | 46 | 46 | 46 | 45 | 45 |
| Muggy (%) | 6 | 6 | 7 | 7 | 8 | 8 | 9 | 10 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 29 | 30 |
| Oppressive (%) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 1 | 1 |
| Dry (%) | Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|---|
| 1 | 9 | 39 | 46 | 6 | 0 |
| 2 | 9 | 39 | 46 | 6 | 0 |
| 3 | 9 | 38 | 46 | 7 | 0 |
| 4 | 8 | 38 | 46 | 7 | 0 |
| 5 | 8 | 38 | 46 | 8 | 0 |
| 6 | 8 | 37 | 47 | 8 | 0 |
| 7 | 7 | 37 | 47 | 9 | 0 |
| 8 | 7 | 36 | 47 | 10 | 0 |
| 9 | 7 | 35 | 48 | 10 | 0 |
| 10 | 6 | 34 | 48 | 11 | 0 |
| 11 | 6 | 34 | 48 | 12 | 0 |
| 12 | 6 | 33 | 48 | 13 | 0 |
| 13 | 5 | 32 | 49 | 14 | 0 |
| 14 | 5 | 31 | 49 | 15 | 0 |
| 15 | 5 | 30 | 49 | 16 | 0 |
| 16 | 5 | 30 | 49 | 17 | 0 |
| 17 | 5 | 29 | 49 | 18 | 0 |
| 18 | 4 | 28 | 49 | 19 | 0 |
| 19 | 4 | 27 | 49 | 20 | 0 |
| 20 | 5 | 26 | 48 | 21 | 0 |
| 21 | 5 | 26 | 48 | 22 | 0 |
| 22 | 4 | 25 | 47 | 23 | 0 |
| 23 | 4 | 24 | 47 | 24 | 0 |
| 24 | 4 | 23 | 47 | 25 | 0 |
| 25 | 4 | 23 | 46 | 26 | 0 |
| 26 | 4 | 22 | 46 | 27 | 1 |
| 27 | 4 | 21 | 46 | 28 | 1 |
| 28 | 4 | 21 | 46 | 29 | 1 |
| 29 | 4 | 21 | 45 | 29 | 1 |
| 30 | 4 | 20 | 45 | 30 | 1 |
Wind in September
Winds average 7 km/h in September, the windiest month of the year.
Across September, daily wind ranges from about 7 km/h on the calmest days to 7 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) | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 | 7 |
| 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 | 7 | calm |
| 2 | 7 | calm |
| 3 | 7 | calm |
| 4 | 7 | calm |
| 5 | 7 | calm |
| 6 | 7 | calm |
| 7 | 7 | calm |
| 8 | 7 | calm |
| 9 | 7 | calm |
| 10 | 7 | calm |
| 11 | 7 | calm |
| 12 | 7 | calm |
| 13 | 7 | calm |
| 14 | 7 | calm |
| 15 | 7 | calm |
| 16 | 7 | calm |
| 17 | 7 | calm |
| 18 | 7 | calm |
| 19 | 7 | calm |
| 20 | 7 | calm |
| 21 | 7 | calm |
| 22 | 7 | calm |
| 23 | 7 | calm |
| 24 | 7 | calm |
| 25 | 7 | calm |
| 26 | 7 | calm |
| 27 | 7 | calm |
| 28 | 7 | calm |
| 29 | 7 | calm |
| 30 | 7 | calm |
Sunrise & sunset in September
Daylight runs from about 11 h 30 min at the start of September to 12 h 12 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 42 minutes over September. Sunrise moves from 7:09 AM to 6:39 AM, and sunset from 6:42 PM to 6:50 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) | 11.5 | 11.6 | 11.6 | 11.6 | 11.6 | 11.6 | 11.7 | 11.7 | 11.7 | 11.7 | 11.8 | 11.8 | 11.8 | 11.8 | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.0 | 12.0 | 12.1 | 12.1 | 12.1 | 12.1 | 12.1 | 12.2 | 12.2 |
| Sunrise (AM) | 7:09 | 7:08 | 7:07 | 7:06 | 7:05 | 7:04 | 7:03 | 7:02 | 7:01 | 7:00 | 6:59 | 6:58 | 6:57 | 6:56 | 6:55 | 6:54 | 6:53 | 6:52 | 6:51 | 6:50 | 6:49 | 6:48 | 6:46 | 6:45 | 6:44 | 6:43 | 6:42 | 6:41 | 6:40 | 6:39 |
| Sunset (PM) | 6:42 | 6:42 | 6:42 | 6:42 | 6:43 | 6:43 | 6:43 | 6:44 | 6:44 | 6:44 | 6:45 | 6:45 | 6:45 | 6:45 | 6:46 | 6:46 | 6:46 | 6:47 | 6:47 | 6:47 | 6:48 | 6:48 | 6:48 | 6:48 | 6:49 | 6:49 | 6:49 | 6:50 | 6:50 | 6:50 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.5 | 7:09 | 6:42 |
| 2 | 11.6 | 7:08 | 6:42 |
| 3 | 11.6 | 7:07 | 6:42 |
| 4 | 11.6 | 7:06 | 6:42 |
| 5 | 11.6 | 7:05 | 6:43 |
| 6 | 11.6 | 7:04 | 6:43 |
| 7 | 11.7 | 7:03 | 6:43 |
| 8 | 11.7 | 7:02 | 6:44 |
| 9 | 11.7 | 7:01 | 6:44 |
| 10 | 11.7 | 7:00 | 6:44 |
| 11 | 11.8 | 6:59 | 6:45 |
| 12 | 11.8 | 6:58 | 6:45 |
| 13 | 11.8 | 6:57 | 6:45 |
| 14 | 11.8 | 6:56 | 6:45 |
| 15 | 11.8 | 6:55 | 6:46 |
| 16 | 11.9 | 6:54 | 6:46 |
| 17 | 11.9 | 6:53 | 6:46 |
| 18 | 11.9 | 6:52 | 6:47 |
| 19 | 11.9 | 6:51 | 6:47 |
| 20 | 12.0 | 6:50 | 6:47 |
| 21 | 12.0 | 6:49 | 6:48 |
| 22 | 12.0 | 6:48 | 6:48 |
| 23 | 12.0 | 6:46 | 6:48 |
| 24 | 12.1 | 6:45 | 6:48 |
| 25 | 12.1 | 6:44 | 6:49 |
| 26 | 12.1 | 6:43 | 6:49 |
| 27 | 12.1 | 6:42 | 6:49 |
| 28 | 12.1 | 6:41 | 6:50 |
| 29 | 12.2 | 6:40 | 6:50 |
| 30 | 12.2 | 6:39 | 6:50 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 4.53 kWh/m².
For context, solar energy here swings from a low near 3.36 kWh/m² to a high of 5.81 kWh/m² in February across the year — September's 4.53 kWh/m² falls in the middle.
| 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) | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.5 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 | 4.6 |
| Level | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright | Bright |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 4.6 | Bright |
| 2 | 4.6 | Bright |
| 3 | 4.6 | Bright |
| 4 | 4.6 | Bright |
| 5 | 4.6 | Bright |
| 6 | 4.6 | Bright |
| 7 | 4.6 | Bright |
| 8 | 4.6 | Bright |
| 9 | 4.6 | Bright |
| 10 | 4.6 | Bright |
| 11 | 4.6 | Bright |
| 12 | 4.6 | Bright |
| 13 | 4.6 | Bright |
| 14 | 4.6 | Bright |
| 15 | 4.6 | Bright |
| 16 | 4.6 | Bright |
| 17 | 4.6 | Bright |
| 18 | 4.5 | Bright |
| 19 | 4.5 | Bright |
| 20 | 4.5 | Bright |
| 21 | 4.5 | Bright |
| 22 | 4.5 | Bright |
| 23 | 4.5 | Bright |
| 24 | 4.6 | Bright |
| 25 | 4.6 | Bright |
| 26 | 4.6 | Bright |
| 27 | 4.6 | Bright |
| 28 | 4.6 | Bright |
| 29 | 4.6 | Bright |
| 30 | 4.6 | Bright |
Hazard calendar for Piraí
None of Piraí's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Piraí's rainy season runs November–March, when most of the year's rain falls.
Is September a good time to visit Piraí?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a reasonable time to visit Piraí for sightseeing. The water and warmth also suit a beach or pool day.
What to pack for Piraí in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Piraí sees daytime highs around 26°C and nights near 17°C. Worth packing: light clothes, rain gear and sun protection. About 12 days see rain.
Sea temperature near Piraí in September
The nearest coast averages about 21°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 55 km away) is warmest in February at about 26°C and coldest in August near 21°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) | 26 | 26 | 26 | 25 | 24 | 23 | 22 | 21 | 21 | 22 | 23 | 24 |
| Comfort | Warm | Warm | Warm | Warm | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Refreshing | Warm |
| Sea temperature (°C) | Comfort | |
|---|---|---|
| Jan | 26 | Warm |
| Feb | 26 | Warm |
| Mar | 26 | Warm |
| Apr | 25 | Warm |
| May | 24 | Refreshing |
| Jun | 23 | Refreshing |
| Jul | 22 | Refreshing |
| Aug | 21 | Refreshing |
| Sep | 21 | Refreshing |
| Oct | 22 | Refreshing |
| Nov | 23 | Refreshing |
| Dec | 24 | Warm |
UV index in Piraí in September
Clear-sky midday UV in September peaks around 7 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Piraí peaks around February 9 at about 14 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 12 at about 5 (high).
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) | 14 | 14 | 12 | 9 | 7 | 6 | 5 | 8 | 7 | 11 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Very high | High | High | High | Very high | High | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 14 | Extreme |
| Feb | 14 | Extreme |
| Mar | 12 | Extreme |
| Apr | 9 | Very high |
| May | 7 | High |
| Jun | 6 | High |
| Jul | 5 | High |
| Aug | 8 | Very high |
| Sep | 7 | High |
| Oct | 11 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Air quality in Piraí 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 Piraí is worst in September — around 33 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (December, 15 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) | 16 | 16 | 17 | 19 | 24 | 29 | 31 | 27 | 33 | 20 | 17 | 15 |
| Level | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 16 | Moderate |
| Feb | 16 | Moderate |
| Mar | 17 | Moderate |
| Apr | 19 | Moderate |
| May | 24 | Moderate |
| Jun | 29 | Moderate |
| Jul | 31 | Moderate |
| Aug | 27 | Moderate |
| Sep | 33 | Moderate |
| Oct | 20 | Moderate |
| Nov | 17 | Moderate |
| Dec | 15 | Moderate |
Where is Piraí?
Piraí sits at 22.6°S, 43.9°W, 381 m above sea level, in Brazil. The nearest listed city is Pinheiral, 17 km away.
Topography around Piraí
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Piraí.
Within 3 km, the terrain around Piraí has only modest variations in elevation — a maximum elevation change of 209 m around an average of 430 m above sea level; within 16 km, large variations in elevation — a maximum elevation change of 806 m; within 80 km, extreme variations in elevation — a maximum elevation change of 2,556 m.
The land around Piraí is covered by trees (51%) and grassland (37%) within 3 km, trees (53%) and grassland (43%) within 16 km, and trees (43%), grassland (31%) and water (20%) 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 Piraí (-22.6292°, -43.8981°, elevation 381 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).