Unión, Paraguay experiences average highs of 29°C (84°F) and lows of 20°C (68°F) throughout the year. Rainfall is moderate, averaging about 9 rainy days per month. Sunshine is abundant, averaging about 10 hours per day. Average highs have warmed by 1.2°C (2.2°F) across the available records.
Unión, Paraguay Weather & Climate 2026
Monthly climate averages for Unión, Paraguay. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Apr–Nov 
Wetter season: Jan–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
6.8/10
Best: May, June, July, August, September
UV Index
7
High
Temperature 29°C / 20°C
Feels Like 31°C / 21°C
Rainy Days 9
Rainfall 113 mm
Sunshine 10 h
Humidity 69%
Wind Speed 15 km/h
Dew Point 18°C
Hottest Month
33°C
January
Avg Low24°C
Rain12days
Coldest Month
15°C
July
Avg High24°C
Rain5days
Driest Month
5days
July
Avg High24°C
Avg Low15°C
Windiest Month
17 km/h
August (Gusts 36)
Worst Time to Visit
Consider avoiding January due to extreme heat, frequent rain, oppressive humidity.
Sun Position
Sunrise 07:30
Daylight 10.6h
Sunset 18:06
Live conditions—
Unión on the map · live conditions
Unión, Paraguay
- Continent
- Americas
- Country
- Paraguay
- City
- Unión
- Population
- 1.7K
- Coordinates
- -24.81°, -56.52°
Seasonal Breakdown
Spring
Sep–Nov
Avg High 30°C
Avg Low 20°C
Rain 10 days/mo
1/3 best months
Summer
Dec–Feb
Avg High 33°C
Avg Low 24°C
Rain 11 days/mo
Autumn
Mar–May
Avg High 28°C
Avg Low 20°C
Rain 10 days/mo
1/3 best months
Winter
Jun–Aug
Avg High 25°C
Avg Low 15°C
Rain 6 days/mo
3/3 best months
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 33°C / 24°C . Feb: 33°C / 24°C . Mar: 31°C / 23°C . Apr: 29°C / 20°C . May: 25°C / 17°C . Jun: 23°C / 15°C . Jul: 24°C / 15°C . Aug: 26°C / 16°C . Sep: 30°C / 19°C . Oct: 30°C / 21°C . Nov: 31°C / 21°C . Dec: 32°C / 23°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 131 mm. Feb: 100 mm. Mar: 125 mm. Apr: 131 mm. May: 119 mm. Jun: 70 mm. Jul: 38 mm. Aug: 87 mm. Sep: 85 mm. Oct: 186 mm. Nov: 146 mm. Dec: 143 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 68%. Feb: 69%. Mar: 70%. Apr: 73%. May: 76%. Jun: 75%. Jul: 68%. Aug: 63%. Sep: 63%. Oct: 68%. Nov: 66%. Dec: 68%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 14 km/h . Feb: 13 km/h . Mar: 13 km/h . Apr: 13 km/h . May: 14 km/h . Jun: 15 km/h . Jul: 15 km/h . Aug: 17 km/h . Sep: 17 km/h . Oct: 17 km/h . Nov: 15 km/h . Dec: 14 km/h .
Sunshine
Sunshine
Sunshine: Jan: 11h. Feb: 11h. Mar: 10h. Apr: 9h. May: 8h. Jun: 8h. Jul: 8h. Aug: 9h. Sep: 9h. Oct: 10h. Nov: 11h. Dec: 11h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 9. Feb: UV 8. Mar: UV 8. Apr: UV 6. May: UV 5. Jun: UV 4. Jul: UV 5. Aug: UV 6. Sep: UV 7. Oct: UV 8. Nov: UV 8. Dec: UV 9.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Climate Trends
Average highs have warmed by 1.2°C (2.2°F) across the available records. Average rainfall is trending drier by about 26 mm.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jan 2025 · 36°C | Jan · 33°C |
| Coldest month | Jul 2025 · 14°C | Jul · 15°C |
| Wettest month | Dec 2025 · 268 mm | Oct · 186 mm |
| Windiest month | Sep 2025 · 18 km/h | Aug · 17 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Fair April
Good May best
Excellent June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Wet November
Fair December
Fair | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 33°C / 24°C | 38°C / 27°C | 12days (131 mm) Wet | 11.2h Excellent | 68% Muggy | 9.2 Very High | Poor | View Details |
| February | 33°C / 24°C | 37°C / 27°C | 11days (100 mm) Wet | 10.9h Excellent | 69% Muggy | 8.3 Very High | Poor | View Details |
| March | 31°C / 23°C | 36°C / 25°C | 11days (125 mm) Wet | 10h Excellent | 70% Muggy | 7.7 Very High | Fair | View Details |
| April | 29°C / 20°C | 31°C / 22°C | 9days (131 mm) Wet | 8.9h Good | 73% Muggy | 5.8 High | Good | View Details |
| May best | 25°C / 17°C | 26°C / 17°C | 10days (119 mm) Wet | 7.5h Good | 76% Humid | 4.7 Moderate | Excellent | View Details |
| June best | 23°C / 15°C | 24°C / 15°C | 7days (70 mm) Good | 7.5h Good | 75% Muggy | 4.1 Moderate | Excellent | View Details |
| July best | 24°C / 15°C | 24°C / 13°C | 5days (38 mm) Good | 8.4h Good | 68% Muggy | 4.6 Moderate | Excellent | View Details |
| August best | 26°C / 16°C | 26°C / 15°C | 7days (87 mm) Good | 8.9h Good | 63% Muggy | 5.5 High | Excellent | View Details |
| September best | 30°C / 19°C | 31°C / 18°C | 7days (85 mm) Good | 9.4h Good | 63% Muggy | 6.9 High | Excellent | View Details |
| October | 30°C / 21°C | 33°C / 21°C | 12days (186 mm) Wet | 9.5h Good | 68% Muggy | 7.6 Very High | Wet | View Details |
| November | 31°C / 21°C | 35°C / 23°C | 10days (146 mm) Wet | 10.9h Excellent | 66% Muggy | 8.3 Very High | Fair | View Details |
| December | 32°C / 23°C | 37°C / 25°C | 11days (143 mm) Wet | 11.2h Excellent | 68% Muggy | 8.5 Very High | Fair | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Unión are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Unión, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Unión is January, with average daytime highs of 33°C (92°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Unión is July, with average overnight lows of 15°C (59°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Unión is October, averaging 186mm of precipitation across 12 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Unión runs through January, October, February, March, with the heaviest rainfall in January. Based on 10-year averages for Unión.
Unión receives approximately 114 sunshine hours per year. The sunniest month is January with around 11 hours. Based on climate data for Unión.
The least favorable months to visit Unión are January, primarily due to extreme heat, frequent rain, oppressive humidity. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Unión is 7, classified as high. SPF 30+ sunscreen, sunglasses, and seeking shade between 10:00–16:00 are strongly recommended.
Average humidity in Unión is 69%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Average wind speeds in Unión are 15 km/h (9 mph). The windiest month is August with peak winds reaching 17 km/h (10 mph) (gusts up to 36 km/h / 22 mph).
Unión averages 9 clear-sky days per month with overall cloud cover around 46%. The clearest skies occur in August.
The annual average dew point in Unión is 18°C (64°F), which feels noticeably humid. Summer months may feel slightly sticky, but conditions remain manageable for most people.
Unión has a Tropical Monsoon climate, classified as Am under the Köppen system. Tropical climates are warm year-round with high rainfall and temperatures rarely dropping below 18°C (64°F).
The 'feels like' temperature in Unión ranges from 21°C (70°F) to 31°C (88°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, June is a great time to visit Unión. It earns a climate score of 8.8/10 with Excellent.
For June in Unión, pack Umbrella, Sunscreen (SPF 30+), Sunglasses, Comfortable walking shoes. With average highs of 23°C (74°F) and 7 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
Last updated: