Live Weather & Forecast
Weather in San Juan
Alajuela, Costa Rica · Real-time conditions & 3-day outlook
17°C
Feels like 17°C
63°F / Feels 63°F
Partly Cloudy
San Juan, Alajuela
🌞 Daytime
Updated: 2026-05-13 06:45
Humidity
91%
Wind
7.6 km/h ENE
Wind Gust
12.1 km/h
Pressure
1015 mb
Visibility
10 km
UV Index
0.3
(Low)
Precipitation
0 mm
Cloud Cover
37%
Dew Point
15.6°C
Wind Degree
60°
Air Quality Index
US EPA: Good
UK DEFRA: Low (1)
CO
175.9 μg/m³
NO₂
3.2 μg/m³
O₃
64 μg/m³
SO₂
3.1 μg/m³
PM 2.5
5.1 μg/m³
PM 10
5.3 μg/m³
Today's Hourly Forecast
24-hour breakdown for San Juan, Alajuela
12 AM
18°
Partly Cloudy
1 AM
18°
Partly Cloudy
2 AM
17°
Partly Cloudy
3 AM
16°
Partly Cloudy
4 AM
16°
Mist
5 AM
15°
Partly Cloudy
6 AM
17°
Partly Cloudy
7 AM
21°
Partly Cloudy
8 AM
23°
Patchy rain nearby
9 AM
25°
Patchy rain nearby
10 AM
26°
Patchy rain nearby
11 AM
26°
Light rain shower
12 PM
25°
Patchy rain nearby
1 PM
24°
Patchy rain nearby
2 PM
23°
Light rain shower
3 PM
23°
Patchy rain nearby
4 PM
23°
Patchy rain nearby
5 PM
22°
Patchy rain nearby
6 PM
19°
Patchy rain nearby
7 PM
19°
Partly Cloudy
8 PM
20°
Partly Cloudy
9 PM
19°
Partly Cloudy
10 PM
18°
Partly Cloudy
11 PM
17°
Partly Cloudy
3-Day Forecast
Daily overview for San Juan, Alajuela
Today
Patchy rain nearby
26°
/
15°
🌧️ 94% chance of rain
💧 Avg. humidity: 82%
💨 Max wind: 8.3 km/h
🌧️ Total precip: 3.98 mm
☀️ UV Index: 14
🌅 Sunrise: 05:16 AM
🌇 Sunset: 05:50 PM
🌙 Waning Crescent
🌑 Moon: 19% lit
Thu, May 14
Moderate rain
27°
/
15°
🌧️ 85% chance of rain
💧 Avg. humidity: 83%
💨 Max wind: 8.3 km/h
🌧️ Total precip: 5.57 mm
☀️ UV Index: 12
🌅 Sunrise: 05:16 AM
🌇 Sunset: 05:50 PM
🌙 Waning Crescent
🌑 Moon: 11% lit
Fri, May 15
Patchy rain nearby
27°
/
14°
🌧️ 87% chance of rain
💧 Avg. humidity: 81%
💨 Max wind: 9 km/h
🌧️ Total precip: 2.6 mm
☀️ UV Index: 0.3
🌅 Sunrise: 05:16 AM
🌇 Sunset: 05:50 PM
🌙 Waning Crescent
🌑 Moon: 5% lit
Best Time to Visit San Juan
Plan your trip to San Juan, Costa Rica 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 San Juan?
Current conditions in San Juan: Partly Cloudy, temperature 17°C, humidity 91%.
What is the best time to visit San Juan?
The best time to visit San Juan is typically November – April. Dry season — low humidity, clear skies, comfortable temperatures.
What is the climate like in San Juan?
San Juan is located at approximately 10° latitude. It has a tropical or subtropical climate with wet and dry seasons.
Does it rain a lot in San Juan?
The wettest period in San Juan is typically during June – September. Wet/monsoon season; heavier rainfall possible.
What should I pack for a trip to San Juan?
For visits to San Juan during November – April: light clothing and sun protection. For June – September: layers and a waterproof jacket are recommended.
What country is San Juan in?
San Juan is located in Costa Rica, in the state of Alajuela.
What are the public holidays in San Juan in 2026?
View the 2026 public holidays for San Juan on our Holidays page.
What are the GPS coordinates used for the weather forecast in San Juan?
The weather forecast for San Juan uses coordinates 9.9617, -84.0814.
What is the current temperature outside in San Juan?
The current outdoor temperature in San Juan is 17°C (63°F) with partly cloudy.
What is the hourly weather forecast for San Juan today?
Today's hour-by-hour weather breakdown for San Juan 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 San Juan tomorrow hour by hour?
Tomorrow's forecast for San Juan shows a high of 27°C and a low of 15°C. See the 3-Day Forecast section above for a full hourly breakdown.
What is the chance of rain today in San Juan?
There is a 94% chance of rain in San Juan 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 San Juan?
Yes, there is a 94% chance of rain in San Juan today — consider carrying an umbrella. Check the hourly forecast above for the most likely rain windows.