Live Weather & Forecast
Weather in São Martinho da Serra
Rio Grande do Sul, Brazil · Real-time conditions & 3-day outlook
21°C
Feels like 21°C
70°F / Feels 70°F
Mist
São Martinho da Serra, Rio Grande do Sul
🌞 Daytime
Updated: 2026-04-21 06:30
Humidity
96%
Wind
3.6 km/h ESE
Wind Gust
10.8 km/h
Pressure
1012 mb
Visibility
2 km
UV Index
0
(Low)
Precipitation
0 mm
Cloud Cover
37%
Dew Point
20.5°C
Wind Degree
113°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
121.9 μg/m³
NO₂
1.3 μg/m³
O₃
39 μg/m³
SO₂
0.9 μg/m³
PM 2.5
4.6 μg/m³
PM 10
4.7 μg/m³
Today's Hourly Forecast
24-hour breakdown for São Martinho da Serra, Rio Grande do Sul
12 AM
21°
Fog
1 AM
21°
Fog
2 AM
21°
Fog
3 AM
21°
Fog
4 AM
21°
Partly Cloudy
5 AM
21°
Partly Cloudy
6 AM
21°
Mist
7 AM
22°
Partly Cloudy
8 AM
24°
Partly Cloudy
9 AM
26°
Patchy rain nearby
10 AM
27°
Patchy rain nearby
11 AM
28°
Patchy rain nearby
12 PM
28°
Patchy rain nearby
1 PM
28°
Patchy rain nearby
2 PM
28°
Patchy rain nearby
3 PM
28°
Patchy rain nearby
4 PM
27°
Patchy rain nearby
5 PM
25°
Moderate or heavy rain shower
6 PM
23°
Patchy rain nearby
7 PM
23°
Mist
8 PM
23°
Mist
9 PM
22°
Mist
10 PM
22°
Mist
11 PM
22°
Mist
3-Day Forecast
Daily overview for São Martinho da Serra, Rio Grande do Sul
Today
Moderate rain
28°
/
21°
🌧️ 87% chance of rain
💧 Avg. humidity: 90%
💨 Max wind: 5.4 km/h
🌧️ Total precip: 11.21 mm
☀️ UV Index: 9.5
🌅 Sunrise: 05:48 AM
🌇 Sunset: 05:38 PM
🌙 Waxing Crescent
🌑 Moon: 17% lit
Wed, Apr 22
Patchy rain nearby
29°
/
21°
🌧️ 87% chance of rain
💧 Avg. humidity: 91%
💨 Max wind: 7.6 km/h
🌧️ Total precip: 4.98 mm
☀️ UV Index: 12.1
🌅 Sunrise: 05:48 AM
🌇 Sunset: 05:38 PM
🌙 Waxing Crescent
🌑 Moon: 27% lit
Thu, Apr 23
Patchy rain nearby
30°
/
20°
🌧️ 88% chance of rain
💧 Avg. humidity: 86%
💨 Max wind: 9.7 km/h
🌧️ Total precip: 3.33 mm
☀️ UV Index: 11.9
🌅 Sunrise: 05:48 AM
🌇 Sunset: 05:37 PM
🌙 Waxing Crescent
🌑 Moon: 38% lit
Best Time to Visit São Martinho da Serra
Plan your trip to São Martinho da Serra, Brazil around the most favorable weather conditions.
Peak Season
November – April
Dry season — low humidity, clear skies, comfortable temperatures.
Shoulder Season
May, October
Fewer crowds, moderate prices, mild weather.
Off Season
June – September
Wet/monsoon season; heavier rainfall possible.
Frequently Asked Questions
What is the current weather in São Martinho da Serra?
Current conditions in São Martinho da Serra: Mist, temperature 21°C, humidity 96%.
What is the best time to visit São Martinho da Serra?
The best time to visit São Martinho da Serra is typically November – April. Dry season — low humidity, clear skies, comfortable temperatures.
What is the climate like in São Martinho da Serra?
São Martinho da Serra is located at approximately -10° latitude. It has a tropical or subtropical climate with wet and dry seasons.
Does it rain a lot in São Martinho da Serra?
The wettest period in São Martinho da Serra is typically during June – September. Wet/monsoon season; heavier rainfall possible.
What should I pack for a trip to São Martinho da Serra?
For visits to São Martinho da Serra during November – April: light clothing and sun protection. For June – September: layers and a waterproof jacket are recommended.
What country is São Martinho da Serra in?
São Martinho da Serra is located in Brazil, in the state of Rio Grande do Sul.
What are the public holidays in São Martinho da Serra in 2026?
View the 2026 public holidays for São Martinho da Serra on our Holidays page.
What are the GPS coordinates used for the weather forecast in São Martinho da Serra?
The weather forecast for São Martinho da Serra uses coordinates -10, -55.
What is the current temperature outside in São Martinho da Serra?
The current outdoor temperature in São Martinho da Serra is 21°C (70°F) with mist.
What is the hourly weather forecast for São Martinho da Serra today?
Today's hour-by-hour weather breakdown for São Martinho da Serra is shown in the Hourly Forecast section above, including temperature, rain chance, and conditions for each hour of the day.
What is the weather in São Martinho da Serra tomorrow hour by hour?
Tomorrow's forecast for São Martinho da Serra shows a high of 29°C and a low of 21°C. See the 3-Day Forecast section above for a full hourly breakdown.
What is the chance of rain today in São Martinho da Serra?
There is a 87% chance of rain in São Martinho da Serra today. Check the hourly forecast above for a time-by-time breakdown of when rain is most likely.
Is it going to rain today in São Martinho da Serra?
Yes, there is a 87% chance of rain in São Martinho da Serra today — consider carrying an umbrella. Check the hourly forecast above for the most likely rain windows.