September 18 is generally a great time to visit Montevideo. While there is a slight chance of rain (16%), showers are usually brief. Expect comfortable 17°C weather. Montevideo is currently in its most popular travel window, meaning vibrant crowds and premium pricing.
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Essential Travel Info for Montevideo
Currency
UYU
$ Uruguayan peso
Language
Spanish
Driving
Right side
Safety
High Safety
GPI: 1.795
Montevideo Weather Forecast for September 18
"Mild & Comfortable. Expect average highs of 16.5°C. 16% chance of rain."
What to Wear in Montevideo in September
Based on historical data for September 18, Montevideo typically experiences temperatures between 10.9°C and 16.5°C. We recommend packing light jacket, long pants to stay comfortable. Trends suggest it will stay mostly dry (16% rain probability), but checking the forecast before heading out is always wise.
Complete Packing Guide
Weekly breakdown & essential items for Montevideo
Smart Suitcase
- Light Jacket
- Long Pants
Average High
16.5°C
Daytime Peak
Average Low
10.9°C
Nighttime Low
Feels Like
16.5°C
🌤️ Feels accurate
Rain Chance
16%
Avg 1.2mm if it rains
Cloud Cover
52%
Overcast
Pressure
1017.8 hPa
Medium volatility
Montevideo Weather Conditions & UV Index
Weather Confidence
30-year variance analysis
Based on 10 years of data
🎯 This date historically delivers consistent weather 94% of the time. Safe to plan outdoor activities with confidence.
Sun Exposure
UV Index & Safety Guide
Protection Needed
SPF 30 recommended
06:00 - 10:00
16:00 - 18:00
Type I-II
🔴 26 min to burn
Type III-IV
🟡 39 min to burn
Type V-VI
🟢 65 min to burn
UV estimate based on latitude, season & cloud cover. Actual UV may vary.
Outdoor Comfort
How pleasant is it outside?
Dew Point
12.5°C
Pleasant
Heat Stress
Low
No heat warning
🙂 Best outdoor time:
Any time during daylight hours
Marine Conditions
Marine Life
No special warnings. Enjoy the swim!
Swim Index
❄️ Cold Water Hazard
Travel & Logistics Insights
Local Calendar
Business Day
Standard hours in Uruguay
Flight Traffic
High
92/100 pressure index
Health Advisory
Recommended
1 vaccine • View Details →
Landing Slots
~24
Daily arrival options (inc. codeshare)
Sunrise, Sunset & Wind in Montevideo
Daylight & Sun
Solar Elevation Cycle
🌅 Sunrise
06:41
☀️ Noon
12:40
🌇 Sunset
18:39
⏱️ Daylight
11h 57m
Wind Speed
21.7 km/h
Moderate wind
Sunshine
8.8 hrs
Direct Sun (Cloud-free)
Humidity
77%
Humid / Damp
Travel Intelligence
Exclusive flight analytics & health data for Montevideo
Smart Flight Estimator
Airport-to-Airport Logistics
unlock smart flight estimates
Add your home location in settings to see airport details.
Travel Health & Safety in Montevideo
Travel Comfort Index
Real-time tourism conditions
Weather Quality
☀️ Excellent
Tourist Crowds
🟡 Busy
Price Level
💰💰💰 Expensive
Health & Wellbeing
Meteo-Health Forecast
Moderate fluctuations. Some sensitivity possible.
Weather unlikely to affect joint pain.
Moderate fish activity expected.
Air quality is excellent. Perfect for outdoor activities.
Regional Safety Profile
Seismic Activity
Zero seismic activity detected in 30 years.
"According to 30YearWeather's analysis of 30 years of NASA satellite data, Montevideo on September 18 averages 16.5°C with a 16% precipitation probability. Wedding/Outdoor Event Score: 91/100."
— Source: 30YearWeather.com|Data: NASA POWER (1991-2021)|View Methodology
Montevideo Weather History (2010–2024)
Temperature History
Hall of Fame
Records from last 10 years
Better Alternatives Nearby
Consider these dates within ±7 days
September 16
15.9°C • 13% rain
Score
96
September 17
16.3°C • 14% rain
Score
96
September 15
15.5°C • 14% rain
Score
95
💡 Moving your event by a few days could significantly improve weather conditions
Compare Other Cities
Same date (September 18) in other destinations
🌍 Explore the same date in different destinations around the world
📍 Is Montevideo Worth Visiting on September 18?
Planning a trip to Montevideo on September 18? Our historical weather analysis based on 30 years of NASA satellite data shows that this time of year is characterized by pleasant mild weather averaging 16.5°C with a 16% historical precipitation risk.
✈️ Travel Logistics: Approximately 24 landing slots available daily during this period, indicating manageable crowd levels.
💉 Health Advisory: 7 vaccinations are recommended for Uruguay, including COVID-19.
🌊 Coastal Conditions: Water temperature averages 14.8°C (polar plunge). Wave conditions are generally fun waves with heights around 0.63m.
📊 Historical Extremes: The hottest September 18 recorded in the last 30 years saw temperatures hit 21.9°C in 2018, while the coldest dropped to 9°C in 2017.