Porto Velho weather in September
In September, Porto Velho sees average daytime highs of 33°C and overnight lows near 24°C, with 103 mm of rain across 16.7 wet days and about 11.9 hours of daylight. It is the 2nd-warmest and 9th-wettest month of the year here.
Day-to-day highs hold fairly steady near 33°C through the month. The sky is clear or mostly clear about 28% of the time in September, and the air most often feels oppressive.
Daylight stretches from about 11 h 48 min at the start of September to 12 h 06 min by month's end. Set against the rest of the year, September is Porto Velho's 4th-clearest and 3rd-windiest month. For the whole year in context, see Porto Velho's year-round climate.
- Daytime high
- 33°
- 2nd warmest
- Overnight low
- 24°
- 10th coldest
- Rainfall
- 103 mm
- 16.7 wet days
- Daylight
- 12 hours
- 6:11 AM – 6:09 PM
- Cloud cover
- 60%
- 4th clearest
- Wind
- 5 km/h
- 3rd windiest
- Solar energy
- 5.52 kWh/m²
- Travel score
- 3.1
- out of 10
Temperature in September
Day-to-day highs hold fairly steady near 33°C through the month.
A typical September day in Porto Velho reaches about 33°C in the afternoon and slips back to 24°C overnight — a 9°C spread between the day's warmth and the night's chill. On most days the high lands between 30°C and 35°C. Set against its neighbours, September runs on par with August and about 1°C warmer 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) | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 | 33 |
| Avg low (°C) | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 23 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 33 | 23 |
| 2 | 33 | 23 |
| 3 | 33 | 23 |
| 4 | 33 | 23 |
| 5 | 33 | 23 |
| 6 | 33 | 23 |
| 7 | 33 | 23 |
| 8 | 33 | 23 |
| 9 | 33 | 24 |
| 10 | 33 | 24 |
| 11 | 33 | 24 |
| 12 | 33 | 24 |
| 13 | 33 | 24 |
| 14 | 33 | 24 |
| 15 | 33 | 24 |
| 16 | 33 | 24 |
| 17 | 33 | 24 |
| 18 | 33 | 24 |
| 19 | 33 | 24 |
| 20 | 33 | 24 |
| 21 | 33 | 24 |
| 22 | 33 | 24 |
| 23 | 33 | 24 |
| 24 | 33 | 24 |
| 25 | 33 | 24 |
| 26 | 33 | 24 |
| 27 | 33 | 24 |
| 28 | 33 | 24 |
| 29 | 33 | 24 |
| 30 | 33 | 24 |
How September really feels in Porto Velho
Once humidity and wind are folded in, September averages 30 days that feel above 32°C and 0 that feel at or below 0°C — the comfort signal a plain temperature reading hides.
The story in September is heat — humidity pushes the afternoon "feels like" well above the raw temperature.
Porto Velho weather by month
How September compares with the rest of the year at a glance. September is the 2nd-warmest and 9th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 30° / 24° | 303 | 28.6 | 12.5 | 2.8 |
| Feb | 30° / 24° | 314 | 26.7 | 12.3 | 2.7 |
| Mar | 30° / 24° | 328 | 29.5 | 12.1 | 2.7 |
| Apr | 30° / 24° | 228 | 26.4 | 11.8 | 2.9 |
| May | 30° / 23° | 133 | 21.5 | 11.6 | 3.6 |
| Jun | 31° / 23° | 44 | 9.5 | 11.5 | 4.9 |
| Jul | 31° / 22° | 22 | 4.7 | 11.5 | 5.1 |
| Aug | 33° / 23° | 42 | 7.6 | 11.7 | 3.9 |
| Sep | 33° / 24° | 103 | 16.7 | 11.9 | 3.1 |
| Oct | 32° / 24° | 178 | 23.3 | 12.2 | 2.7 |
| Nov | 31° / 24° | 246 | 26.3 | 12.4 | 2.7 |
| Dec | 30° / 24° | 298 | 28.7 | 12.5 | 2.7 |
Cloud cover in September
The sky is clear or mostly clear about 28% of the time in September.
Beyond those clear spells, partly cloudy skies cover about 23% of September, with mostly cloudy or overcast conditions the remaining 49%. 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 (%) | 64 | 64 | 62 | 62 | 60 | 60 | 59 | 58 | 58 | 57 | 56 | 56 | 55 | 53 | 52 | 51 | 50 | 49 | 47 | 46 | 45 | 44 | 43 | 42 | 40 | 40 | 39 | 39 | 38 | 38 |
| Cloudier (%) | 36 | 36 | 38 | 38 | 40 | 40 | 41 | 42 | 42 | 43 | 44 | 44 | 45 | 47 | 48 | 49 | 50 | 51 | 53 | 54 | 55 | 56 | 57 | 58 | 60 | 60 | 61 | 61 | 62 | 62 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 64 | 36 |
| 2 | 64 | 36 |
| 3 | 62 | 38 |
| 4 | 62 | 38 |
| 5 | 60 | 40 |
| 6 | 60 | 40 |
| 7 | 59 | 41 |
| 8 | 58 | 42 |
| 9 | 58 | 42 |
| 10 | 57 | 43 |
| 11 | 56 | 44 |
| 12 | 56 | 44 |
| 13 | 55 | 45 |
| 14 | 53 | 47 |
| 15 | 52 | 48 |
| 16 | 51 | 49 |
| 17 | 50 | 50 |
| 18 | 49 | 51 |
| 19 | 47 | 53 |
| 20 | 46 | 54 |
| 21 | 45 | 55 |
| 22 | 44 | 56 |
| 23 | 43 | 57 |
| 24 | 42 | 58 |
| 25 | 40 | 60 |
| 26 | 40 | 60 |
| 27 | 39 | 61 |
| 28 | 39 | 61 |
| 29 | 38 | 62 |
| 30 | 38 | 62 |
Chance of precipitation in September
Porto Velho gets around 103 mm of rain over 16.7 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 55% and peaks near 66% 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 (%) | 45 | 46 | 46 | 47 | 47 | 47 | 48 | 49 | 49 | 50 | 51 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63 | 63 | 64 | 64 | 65 | 65 | 66 |
| Rain chance (%) | |
|---|---|
| 1 | 45 |
| 2 | 46 |
| 3 | 46 |
| 4 | 47 |
| 5 | 47 |
| 6 | 47 |
| 7 | 48 |
| 8 | 49 |
| 9 | 49 |
| 10 | 50 |
| 11 | 51 |
| 12 | 51 |
| 13 | 52 |
| 14 | 53 |
| 15 | 54 |
| 16 | 55 |
| 17 | 56 |
| 18 | 57 |
| 19 | 58 |
| 20 | 59 |
| 21 | 60 |
| 22 | 61 |
| 23 | 62 |
| 24 | 63 |
| 25 | 63 |
| 26 | 64 |
| 27 | 64 |
| 28 | 65 |
| 29 | 65 |
| 30 | 66 |
Humidity in September
Most of September feels oppressive — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the oppressive band about 59% of days. Sticky, muggy-or-worse air turns up on roughly 98% 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 | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Comfortable (%) | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Humid (%) | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Muggy (%) | 10 | 9 | 9 | 9 | 9 | 8 | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 6 | 6 | 6 | 5 | 5 | 5 | 5 | 4 | 4 | 4 | 3 | 3 | 3 | 3 | 2 |
| Oppressive (%) | 62 | 63 | 63 | 64 | 63 | 64 | 63 | 64 | 64 | 63 | 62 | 62 | 62 | 61 | 60 | 61 | 60 | 59 | 59 | 58 | 56 | 55 | 55 | 54 | 53 | 53 | 52 | 52 | 51 | 52 |
| Miserable (%) | 22 | 22 | 23 | 23 | 24 | 24 | 25 | 25 | 26 | 27 | 28 | 28 | 29 | 30 | 31 | 32 | 33 | 34 | 35 | 36 | 38 | 39 | 40 | 41 | 42 | 43 | 44 | 44 | 45 | 45 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | Miserable (%) | |
|---|---|---|---|---|---|
| 1 | 2 | 4 | 10 | 62 | 22 |
| 2 | 2 | 4 | 9 | 63 | 22 |
| 3 | 1 | 4 | 9 | 63 | 23 |
| 4 | 1 | 3 | 9 | 64 | 23 |
| 5 | 1 | 3 | 9 | 63 | 24 |
| 6 | 1 | 3 | 8 | 64 | 24 |
| 7 | 1 | 3 | 8 | 63 | 25 |
| 8 | 1 | 2 | 8 | 64 | 25 |
| 9 | 0 | 2 | 8 | 64 | 26 |
| 10 | 0 | 2 | 8 | 63 | 27 |
| 11 | 0 | 2 | 8 | 62 | 28 |
| 12 | 0 | 2 | 8 | 62 | 28 |
| 13 | 0 | 2 | 7 | 62 | 29 |
| 14 | 0 | 2 | 7 | 61 | 30 |
| 15 | 0 | 2 | 7 | 60 | 31 |
| 16 | 0 | 1 | 6 | 61 | 32 |
| 17 | 0 | 1 | 6 | 60 | 33 |
| 18 | 0 | 1 | 6 | 59 | 34 |
| 19 | 0 | 1 | 5 | 59 | 35 |
| 20 | 0 | 1 | 5 | 58 | 36 |
| 21 | 0 | 1 | 5 | 56 | 38 |
| 22 | 0 | 1 | 5 | 55 | 39 |
| 23 | 0 | 1 | 4 | 55 | 40 |
| 24 | 0 | 1 | 4 | 54 | 41 |
| 25 | 0 | 1 | 4 | 53 | 42 |
| 26 | 0 | 1 | 3 | 53 | 43 |
| 27 | 0 | 1 | 3 | 52 | 44 |
| 28 | 0 | 1 | 3 | 52 | 44 |
| 29 | 0 | 1 | 3 | 51 | 45 |
| 30 | 0 | 1 | 2 | 52 | 45 |
Wind in September
Winds average 5 km/h in September.
Across September, daily wind ranges from about 5 km/h on the calmest days to 5 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) | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 | 5 |
| 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 | 5 | calm |
| 2 | 5 | calm |
| 3 | 5 | calm |
| 4 | 5 | calm |
| 5 | 5 | calm |
| 6 | 5 | calm |
| 7 | 5 | calm |
| 8 | 5 | calm |
| 9 | 5 | calm |
| 10 | 5 | calm |
| 11 | 5 | calm |
| 12 | 5 | calm |
| 13 | 5 | calm |
| 14 | 5 | calm |
| 15 | 5 | calm |
| 16 | 5 | calm |
| 17 | 5 | calm |
| 18 | 5 | calm |
| 19 | 5 | calm |
| 20 | 5 | calm |
| 21 | 5 | calm |
| 22 | 5 | calm |
| 23 | 5 | calm |
| 24 | 5 | calm |
| 25 | 5 | calm |
| 26 | 5 | calm |
| 27 | 5 | calm |
| 28 | 5 | calm |
| 29 | 5 | calm |
| 30 | 5 | calm |
Sunrise & sunset in September
Daylight runs from about 11 h 48 min at the start of September to 12 h 06 min by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 18 minutes over September. Sunrise moves from 6:20 AM to 6:03 AM, and sunset from 6:10 PM to 6:07 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) | 11.8 | 11.8 | 11.8 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 11.9 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.1 | 12.1 | 12.1 |
| Sunrise (AM) | 6:20 | 6:20 | 6:19 | 6:19 | 6:18 | 6:17 | 6:17 | 6:16 | 6:16 | 6:15 | 6:14 | 6:14 | 6:13 | 6:13 | 6:12 | 6:11 | 6:11 | 6:10 | 6:10 | 6:09 | 6:08 | 6:08 | 6:07 | 6:06 | 6:06 | 6:05 | 6:05 | 6:04 | 6:03 | 6:03 |
| Sunset (PM) | 6:10 | 6:10 | 6:10 | 6:10 | 6:10 | 6:10 | 6:10 | 6:09 | 6:09 | 6:09 | 6:09 | 6:09 | 6:09 | 6:09 | 6:09 | 6:09 | 6:08 | 6:08 | 6:08 | 6:08 | 6:08 | 6:08 | 6:08 | 6:08 | 6:07 | 6:07 | 6:07 | 6:07 | 6:07 | 6:07 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.8 | 6:20 | 6:10 |
| 2 | 11.8 | 6:20 | 6:10 |
| 3 | 11.8 | 6:19 | 6:10 |
| 4 | 11.9 | 6:19 | 6:10 |
| 5 | 11.9 | 6:18 | 6:10 |
| 6 | 11.9 | 6:17 | 6:10 |
| 7 | 11.9 | 6:17 | 6:10 |
| 8 | 11.9 | 6:16 | 6:09 |
| 9 | 11.9 | 6:16 | 6:09 |
| 10 | 11.9 | 6:15 | 6:09 |
| 11 | 11.9 | 6:14 | 6:09 |
| 12 | 11.9 | 6:14 | 6:09 |
| 13 | 11.9 | 6:13 | 6:09 |
| 14 | 11.9 | 6:13 | 6:09 |
| 15 | 11.9 | 6:12 | 6:09 |
| 16 | 12.0 | 6:11 | 6:09 |
| 17 | 12.0 | 6:11 | 6:08 |
| 18 | 12.0 | 6:10 | 6:08 |
| 19 | 12.0 | 6:10 | 6:08 |
| 20 | 12.0 | 6:09 | 6:08 |
| 21 | 12.0 | 6:08 | 6:08 |
| 22 | 12.0 | 6:08 | 6:08 |
| 23 | 12.0 | 6:07 | 6:08 |
| 24 | 12.0 | 6:06 | 6:08 |
| 25 | 12.0 | 6:06 | 6:07 |
| 26 | 12.0 | 6:05 | 6:07 |
| 27 | 12.0 | 6:05 | 6:07 |
| 28 | 12.1 | 6:04 | 6:07 |
| 29 | 12.1 | 6:03 | 6:07 |
| 30 | 12.1 | 6:03 | 6:07 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 5.52 kWh/m² — the sunniest month for solar.
For context, solar energy here swings from a low near 4.21 kWh/m² to a high of 5.52 kWh/m² in September across the year — September's 5.52 kWh/m² sits near the top of that range.
| 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) | 5.4 | 5.4 | 5.4 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.5 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 | 5.6 |
| 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 | 5.4 | Bright |
| 2 | 5.4 | Bright |
| 3 | 5.4 | Bright |
| 4 | 5.5 | Bright |
| 5 | 5.5 | Bright |
| 6 | 5.5 | Bright |
| 7 | 5.5 | Bright |
| 8 | 5.5 | Bright |
| 9 | 5.5 | Bright |
| 10 | 5.5 | Bright |
| 11 | 5.5 | Bright |
| 12 | 5.5 | Bright |
| 13 | 5.5 | Bright |
| 14 | 5.5 | Bright |
| 15 | 5.5 | Bright |
| 16 | 5.5 | Bright |
| 17 | 5.5 | Bright |
| 18 | 5.5 | Bright |
| 19 | 5.6 | Bright |
| 20 | 5.6 | Bright |
| 21 | 5.6 | Bright |
| 22 | 5.6 | Bright |
| 23 | 5.6 | Bright |
| 24 | 5.6 | Bright |
| 25 | 5.6 | Bright |
| 26 | 5.6 | Bright |
| 27 | 5.6 | Bright |
| 28 | 5.6 | Bright |
| 29 | 5.6 | Bright |
| 30 | 5.6 | Bright |
Hazard calendar for Porto Velho
None of Porto Velho's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
Porto Velho's rainy season runs October–April, when most of the year's rain falls.
Is September a good time to visit Porto Velho?
Our two travel scores rate September for general sightseeing and for beach or pool weather — 0 (poor) to 10 (ideal).
September is a weaker month for outdoor sightseeing in Porto Velho.
What to pack for Porto Velho in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, Porto Velho sees daytime highs around 33°C and nights near 24°C. Pack light clothes and rain gear. Worth having: sun protection. About 17 days see rain.
UV index in Porto Velho in September
Clear-sky midday UV in September peaks around 4 — enough to warrant sun protection. The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in Porto Velho peaks around January 20 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near September 11 at about 4 (moderate).
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) | 15 | 15 | 15 | 13 | 10 | 9 | 9 | 5 | 4 | 11 | 13 | 14 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | High | Moderate | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 15 | Extreme |
| Feb | 15 | Extreme |
| Mar | 15 | Extreme |
| Apr | 13 | Extreme |
| May | 10 | Extreme |
| Jun | 9 | Very high |
| Jul | 9 | Very high |
| Aug | 5 | High |
| Sep | 4 | Moderate |
| Oct | 11 | Extreme |
| Nov | 13 | Extreme |
| Dec | 14 | Extreme |
Air quality in Porto Velho 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 Porto Velho is worst in August — around 101 µg/m³ PM2.5 (unhealthy), about 9.5× the cleanest month (May, 11 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) | 13 | 13 | 15 | 12 | 11 | 12 | 34 | 101 | 100 | 36 | 20 | 15 |
| Level | Moderate | Moderate | Moderate | Good | Good | Good | Moderate | Unhealthy | Unhealthy | Poor | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 13 | Moderate |
| Feb | 13 | Moderate |
| Mar | 15 | Moderate |
| Apr | 12 | Good |
| May | 11 | Good |
| Jun | 12 | Good |
| Jul | 34 | Moderate |
| Aug | 101 | Unhealthy |
| Sep | 100 | Unhealthy |
| Oct | 36 | Poor |
| Nov | 20 | Moderate |
| Dec | 15 | Moderate |
Where is Porto Velho?
Porto Velho sits at 8.8°S, 63.9°W, 90 m above sea level, in Brazil. The nearest listed city is Candeias do Jamari, 23 km away.
Topography around Porto Velho
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of Porto Velho.
Within 3 km, the terrain around Porto Velho has only modest variations in elevation — a maximum elevation change of 47 m around an average of 76 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 130 m; within 80 km, significant variations in elevation — a maximum elevation change of 342 m.
The land around Porto Velho is covered by artificial surfaces (54%) and trees (23%) within 3 km, trees (54%) and grassland (29%) within 16 km, and trees (75%) and grassland (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 Porto Velho (-8.7619°, -63.9039°, elevation 90 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. 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).