União weather in September
In September, União sees average daytime highs of 36°C and overnight lows near 24°C, with 3 mm of rain across 0.6 wet days and about 12 hours of daylight. It is the 2nd-warmest and 11th-wettest month of the year here.
Day-to-day highs hold fairly steady near 36°C through the month. The sky is clear or mostly clear about 72% of the time in September, and the air most often feels muggy.
Daylight stretches from about 11 h 54 min at the start of September to 12 hours by month's end. Set against the rest of the year, September is União's 1st-clearest and 2nd-windiest month. For the whole year in context, see União's year-round climate.
- Daytime high
- 36°
- 2nd warmest
- Overnight low
- 24°
- 9th coldest
- Rainfall
- 3 mm
- 0.6 wet days
- Daylight
- 12 hours
- 5:47 AM – 5:45 PM
- Cloud cover
- 33%
- 1st clearest
- Wind
- 9 km/h
- 2nd windiest
- Solar energy
- 6.6 kWh/m²
- Travel score
- 2.3
- out of 10
União is settlement in Uniao, Piaui, Brazil.
Air quality: WHO Ambient Air Quality Database. Density & description: Wikidata (CC0), GeoNames.
Temperature in September
Day-to-day highs hold fairly steady near 36°C through the month.
A typical September day in União reaches about 36°C in the afternoon and slips back to 24°C overnight — a 12°C spread between the day's warmth and the night's chill. On most days the high lands between 35°C and 38°C. Set against its neighbours, September runs about 1°C warmer than August and on par with 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) | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 36 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 | 37 |
| Avg low (°C) | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 24 | 25 | 25 | 25 | 25 | 25 | 25 | 25 |
| Avg high (°C) | Avg low (°C) | |
|---|---|---|
| 1 | 36 | 24 |
| 2 | 36 | 24 |
| 3 | 36 | 24 |
| 4 | 36 | 24 |
| 5 | 36 | 24 |
| 6 | 36 | 24 |
| 7 | 36 | 24 |
| 8 | 36 | 24 |
| 9 | 36 | 24 |
| 10 | 36 | 24 |
| 11 | 36 | 24 |
| 12 | 36 | 24 |
| 13 | 36 | 24 |
| 14 | 36 | 24 |
| 15 | 36 | 24 |
| 16 | 36 | 24 |
| 17 | 37 | 24 |
| 18 | 37 | 24 |
| 19 | 37 | 24 |
| 20 | 37 | 24 |
| 21 | 37 | 24 |
| 22 | 37 | 24 |
| 23 | 37 | 24 |
| 24 | 37 | 25 |
| 25 | 37 | 25 |
| 26 | 37 | 25 |
| 27 | 37 | 25 |
| 28 | 37 | 25 |
| 29 | 37 | 25 |
| 30 | 37 | 25 |
How September really feels in União
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.
União weather by month
How September compares with the rest of the year at a glance. September is the 2nd-warmest and 11th-wettest month here — the current month is highlighted below.
| Month | High / Low (°C) | Rainfall (mm) | Wet days | Daylight (hours) | Travel score |
|---|---|---|---|---|---|
| Jan | 33° / 24° | 228 | 21.8 | 12.2 | 2.6 |
| Feb | 32° / 23° | 296 | 22.2 | 12.2 | 2.7 |
| Mar | 31° / 23° | 363 | 27 | 12 | 2.6 |
| Apr | 31° / 23° | 325 | 24.6 | 11.9 | 2.8 |
| May | 32° / 23° | 143 | 15.1 | 11.8 | 3.6 |
| Jun | 33° / 23° | 23 | 4.6 | 11.7 | 4.2 |
| Jul | 34° / 23° | 12 | 1.7 | 11.8 | 4.0 |
| Aug | 35° / 24° | 2 | 0.5 | 11.9 | 3.2 |
| Sep | 36° / 24° | 3 | 0.6 | 12 | 2.3 |
| Oct | 37° / 25° | 10 | 1.5 | 12.1 | 1.8 |
| Nov | 36° / 25° | 35 | 4.5 | 12.2 | 2.0 |
| Dec | 35° / 25° | 84 | 9.7 | 12.3 | 2.4 |
Cloud cover in September
The sky is clear or mostly clear about 72% of the time in September, the clearest month of the year.
Beyond those clear spells, partly cloudy skies cover about 18% of September, with mostly cloudy or overcast conditions the remaining 10%.
| 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 (%) | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 91 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 90 | 91 | 91 | 91 | 91 | 91 | 90 | 89 | 89 | 89 | 89 |
| Cloudier (%) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 10 | 9 | 9 | 9 | 9 | 9 | 10 | 11 | 11 | 11 | 11 |
| Clearer (%) | Cloudier (%) | |
|---|---|---|
| 1 | 91 | 9 |
| 2 | 91 | 9 |
| 3 | 91 | 9 |
| 4 | 91 | 9 |
| 5 | 91 | 9 |
| 6 | 91 | 9 |
| 7 | 91 | 9 |
| 8 | 91 | 9 |
| 9 | 91 | 9 |
| 10 | 91 | 9 |
| 11 | 90 | 10 |
| 12 | 90 | 10 |
| 13 | 90 | 10 |
| 14 | 90 | 10 |
| 15 | 90 | 10 |
| 16 | 90 | 10 |
| 17 | 90 | 10 |
| 18 | 90 | 10 |
| 19 | 90 | 10 |
| 20 | 90 | 10 |
| 21 | 91 | 9 |
| 22 | 91 | 9 |
| 23 | 91 | 9 |
| 24 | 91 | 9 |
| 25 | 91 | 9 |
| 26 | 90 | 10 |
| 27 | 89 | 11 |
| 28 | 89 | 11 |
| 29 | 89 | 11 |
| 30 | 89 | 11 |
Chance of precipitation in September
União gets around 3 mm of rain over 0.6 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 2% and peaks near 3% on the wettest days.
| 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 (%) | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 2 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Rain chance (%) | |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 1 |
| 4 | 1 |
| 5 | 1 |
| 6 | 1 |
| 7 | 1 |
| 8 | 1 |
| 9 | 2 |
| 10 | 2 |
| 11 | 2 |
| 12 | 2 |
| 13 | 2 |
| 14 | 2 |
| 15 | 2 |
| 16 | 2 |
| 17 | 2 |
| 18 | 2 |
| 19 | 3 |
| 20 | 3 |
| 21 | 3 |
| 22 | 3 |
| 23 | 3 |
| 24 | 3 |
| 25 | 3 |
| 26 | 3 |
| 27 | 3 |
| 28 | 3 |
| 29 | 3 |
| 30 | 3 |
Humidity in September
Most of September feels muggy — the stacked bands show each day's mix of comfort levels, read off the dew point.
By dew point, September lands in the muggy band about 68% of days. Sticky, muggy-or-worse air turns up on roughly 75% 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 (%) | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | 2 | 2 | 2 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Humid (%) | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 28 | 27 | 27 | 26 | 26 | 25 | 24 | 24 | 23 | 22 | 21 | 21 | 20 | 19 | 18 | 18 | 17 | 17 | 16 | 16 | 16 | 16 | 17 |
| Muggy (%) | 61 | 61 | 61 | 61 | 61 | 61 | 62 | 62 | 63 | 63 | 64 | 65 | 66 | 67 | 67 | 68 | 70 | 71 | 71 | 72 | 73 | 74 | 74 | 75 | 75 | 75 | 75 | 75 | 75 | 74 |
| Oppressive (%) | 8 | 8 | 8 | 8 | 8 | 8 | 7 | 7 | 7 | 7 | 7 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 6 | 7 | 7 | 7 | 7 | 7 | 8 | 8 | 8 | 8 | 8 |
| Comfortable (%) | Humid (%) | Muggy (%) | Oppressive (%) | |
|---|---|---|---|---|
| 1 | 3 | 28 | 61 | 8 |
| 2 | 3 | 28 | 61 | 8 |
| 3 | 3 | 28 | 61 | 8 |
| 4 | 3 | 28 | 61 | 8 |
| 5 | 3 | 28 | 61 | 8 |
| 6 | 3 | 28 | 61 | 8 |
| 7 | 3 | 28 | 62 | 7 |
| 8 | 3 | 28 | 62 | 7 |
| 9 | 3 | 27 | 63 | 7 |
| 10 | 3 | 27 | 63 | 7 |
| 11 | 3 | 26 | 64 | 7 |
| 12 | 3 | 26 | 65 | 6 |
| 13 | 3 | 25 | 66 | 6 |
| 14 | 3 | 24 | 67 | 6 |
| 15 | 3 | 24 | 67 | 6 |
| 16 | 3 | 23 | 68 | 6 |
| 17 | 2 | 22 | 70 | 6 |
| 18 | 2 | 21 | 71 | 6 |
| 19 | 2 | 21 | 71 | 6 |
| 20 | 2 | 20 | 72 | 6 |
| 21 | 1 | 19 | 73 | 7 |
| 22 | 1 | 18 | 74 | 7 |
| 23 | 1 | 18 | 74 | 7 |
| 24 | 1 | 17 | 75 | 7 |
| 25 | 1 | 17 | 75 | 7 |
| 26 | 1 | 16 | 75 | 8 |
| 27 | 1 | 16 | 75 | 8 |
| 28 | 1 | 16 | 75 | 8 |
| 29 | 1 | 16 | 75 | 8 |
| 30 | 1 | 17 | 74 | 8 |
Wind in September
Winds average 9 km/h in September.
Across September, daily wind ranges from about 9 km/h on the calmest days to 9 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) | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 | 9 |
| 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 | 9 | calm |
| 2 | 9 | calm |
| 3 | 9 | calm |
| 4 | 9 | calm |
| 5 | 9 | calm |
| 6 | 9 | calm |
| 7 | 9 | calm |
| 8 | 9 | calm |
| 9 | 9 | calm |
| 10 | 9 | calm |
| 11 | 9 | calm |
| 12 | 9 | calm |
| 13 | 9 | calm |
| 14 | 9 | calm |
| 15 | 9 | calm |
| 16 | 9 | calm |
| 17 | 9 | calm |
| 18 | 9 | calm |
| 19 | 9 | calm |
| 20 | 9 | calm |
| 21 | 9 | calm |
| 22 | 9 | calm |
| 23 | 9 | calm |
| 24 | 9 | calm |
| 25 | 9 | calm |
| 26 | 9 | calm |
| 27 | 9 | calm |
| 28 | 9 | calm |
| 29 | 9 | calm |
| 30 | 9 | calm |
Sunrise & sunset in September
Daylight runs from about 11 h 54 min at the start of September to 12 hours by month's end. The lit band spans sunrise to sunset each day.
Days grow by about 6 minutes over September. Sunrise moves from 5:54 AM to 5:40 AM, and sunset from 5:49 PM to 5:42 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) | 11.9 | 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 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 | 12.0 |
| Sunrise (AM) | 5:54 | 5:53 | 5:53 | 5:52 | 5:52 | 5:51 | 5:51 | 5:51 | 5:50 | 5:50 | 5:49 | 5:49 | 5:48 | 5:48 | 5:47 | 5:47 | 5:46 | 5:46 | 5:45 | 5:45 | 5:44 | 5:44 | 5:43 | 5:43 | 5:42 | 5:42 | 5:41 | 5:41 | 5:40 | 5:40 |
| Sunset (PM) | 5:49 | 5:48 | 5:48 | 5:48 | 5:48 | 5:47 | 5:47 | 5:47 | 5:47 | 5:46 | 5:46 | 5:46 | 5:46 | 5:46 | 5:45 | 5:45 | 5:45 | 5:45 | 5:44 | 5:44 | 5:44 | 5:44 | 5:43 | 5:43 | 5:43 | 5:43 | 5:42 | 5:42 | 5:42 | 5:42 |
| Daylight (h) | Sunrise (AM) | Sunset (PM) | |
|---|---|---|---|
| 1 | 11.9 | 5:54 | 5:49 |
| 2 | 11.9 | 5:53 | 5:48 |
| 3 | 11.9 | 5:53 | 5:48 |
| 4 | 11.9 | 5:52 | 5:48 |
| 5 | 11.9 | 5:52 | 5:48 |
| 6 | 11.9 | 5:51 | 5:47 |
| 7 | 11.9 | 5:51 | 5:47 |
| 8 | 11.9 | 5:51 | 5:47 |
| 9 | 11.9 | 5:50 | 5:47 |
| 10 | 11.9 | 5:50 | 5:46 |
| 11 | 12.0 | 5:49 | 5:46 |
| 12 | 12.0 | 5:49 | 5:46 |
| 13 | 12.0 | 5:48 | 5:46 |
| 14 | 12.0 | 5:48 | 5:46 |
| 15 | 12.0 | 5:47 | 5:45 |
| 16 | 12.0 | 5:47 | 5:45 |
| 17 | 12.0 | 5:46 | 5:45 |
| 18 | 12.0 | 5:46 | 5:45 |
| 19 | 12.0 | 5:45 | 5:44 |
| 20 | 12.0 | 5:45 | 5:44 |
| 21 | 12.0 | 5:44 | 5:44 |
| 22 | 12.0 | 5:44 | 5:44 |
| 23 | 12.0 | 5:43 | 5:43 |
| 24 | 12.0 | 5:43 | 5:43 |
| 25 | 12.0 | 5:42 | 5:43 |
| 26 | 12.0 | 5:42 | 5:43 |
| 27 | 12.0 | 5:41 | 5:42 |
| 28 | 12.0 | 5:41 | 5:42 |
| 29 | 12.0 | 5:40 | 5:42 |
| 30 | 12.0 | 5:40 | 5:42 |
Solar energy in September
Average shortwave solar energy reaching the ground each day in September, about 6.6 kWh/m².
For context, solar energy here swings from a low near 4.76 kWh/m² to a high of 6.71 kWh/m² in October across the year — September's 6.6 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) | 6.4 | 6.4 | 6.4 | 6.4 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.5 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.6 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 | 6.7 |
| Level | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense | Intense |
| Solar energy (kWh/m²) | Level | |
|---|---|---|
| 1 | 6.4 | Intense |
| 2 | 6.4 | Intense |
| 3 | 6.4 | Intense |
| 4 | 6.4 | Intense |
| 5 | 6.5 | Intense |
| 6 | 6.5 | Intense |
| 7 | 6.5 | Intense |
| 8 | 6.5 | Intense |
| 9 | 6.5 | Intense |
| 10 | 6.5 | Intense |
| 11 | 6.5 | Intense |
| 12 | 6.6 | Intense |
| 13 | 6.6 | Intense |
| 14 | 6.6 | Intense |
| 15 | 6.6 | Intense |
| 16 | 6.6 | Intense |
| 17 | 6.6 | Intense |
| 18 | 6.6 | Intense |
| 19 | 6.6 | Intense |
| 20 | 6.7 | Intense |
| 21 | 6.7 | Intense |
| 22 | 6.7 | Intense |
| 23 | 6.7 | Intense |
| 24 | 6.7 | Intense |
| 25 | 6.7 | Intense |
| 26 | 6.7 | Intense |
| 27 | 6.7 | Intense |
| 28 | 6.7 | Intense |
| 29 | 6.7 | Intense |
| 30 | 6.7 | Intense |
Hazard calendar for União
None of União's seasonal hazards are active in September. The full-year calendar below shows when the rainy season, cyclone risk and dust haze do peak.
União's monsoon runs January–April, when most of the year's rain falls.
Is September a good time to visit União?
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 União.
What to pack for União in September
From September's temperature range, rain chance, sun and wind — what's worth putting in the bag.
In September, União sees daytime highs around 36°C and nights near 24°C. Pack light clothes and sun protection.
UV index in União in September
Clear-sky midday UV in September peaks around 12 (very high — sun protection essential). The full-year curve, shaded by WHO exposure level, is below.
Under clear skies, the midday UV index in União peaks around March 14 at about 15 (extreme) — sunscreen, a hat and midday shade are essential. It bottoms out near July 24 at about 10 (very 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) | 13 | 14 | 15 | 13 | 11 | 10 | 10 | 10 | 12 | 12 | 11 | 11 |
| Level | Extreme | Extreme | Extreme | Extreme | Extreme | Very high | Very high | Very high | Extreme | Extreme | Extreme | Extreme |
| UV index (midday) | Level | |
|---|---|---|
| Jan | 13 | Extreme |
| Feb | 14 | Extreme |
| Mar | 15 | Extreme |
| Apr | 13 | Extreme |
| May | 11 | Extreme |
| Jun | 10 | Very high |
| Jul | 10 | Very high |
| Aug | 10 | Very high |
| Sep | 12 | Extreme |
| Oct | 12 | Extreme |
| Nov | 11 | Extreme |
| Dec | 11 | Extreme |
Air quality in União 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 União is worst in November — around 22 µg/m³ PM2.5 (moderate), about 2.1× the cleanest month (June, 10 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) | 15 | 16 | 14 | 13 | 12 | 10 | 14 | 20 | 17 | 22 | 22 | 18 |
| Level | Moderate | Moderate | Moderate | Moderate | Good | Good | Moderate | Moderate | Moderate | Moderate | Moderate | Moderate |
| PM2.5 (µg/m³) | Level | |
|---|---|---|
| Jan | 15 | Moderate |
| Feb | 16 | Moderate |
| Mar | 14 | Moderate |
| Apr | 13 | Moderate |
| May | 12 | Good |
| Jun | 10 | Good |
| Jul | 14 | Moderate |
| Aug | 20 | Moderate |
| Sep | 17 | Moderate |
| Oct | 22 | Moderate |
| Nov | 22 | Moderate |
| Dec | 18 | Moderate |
Where is União?
União sits at 4.6°S, 42.9°W, 60 m above sea level, in Brazil. The nearest listed city is José de Freitas, 37 km away.
Topography around União
How much the land rises and falls, and what covers it, within 3, 16 and 80 km of União.
Within 3 km, the terrain around União has only modest variations in elevation — a maximum elevation change of 96 m around an average of 54 m above sea level; within 16 km, only modest variations in elevation — a maximum elevation change of 139 m; within 80 km, significant variations in elevation — a maximum elevation change of 318 m.
The land around União is covered by grassland (40%) and trees (24%) within 3 km, trees (58%) and grassland (23%) within 16 km, and trees (66%) 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 União (-4.5858°, -42.8642°, elevation 60 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).