Normal weather on 21 September in San Juan
The weather on 21 September in San Juan has an average temperature of about 10°C during the day. The maximum temperature can reach up to 15°C, while the minimum temperature can be 6°C.
On average, 1,3 mm of rain falls in San Juan on 21 September. The total snowfall on 21 September is about 0,1 cm of snow. The wind speed is 6 Beaufort and mainly comes from South.
21 September Averages for San Juan
 Average temperature | 10°C |
 Highest daytime temperature | 15°C |
| Lowest daytime temperature | 6°C |
 Total rainfall | 1,3 mm |
| Rainy days | 1 day |
 Total snowfall | 0,1 cm |
| Snowy days | 1 day |
Temperature on 21 September in San Juan per Year
This graph shows the measured temperature on 21 September in San Juan per year, measured in degrees Celsius, over the past years.
Precipitation on 21 September in San Juan per Year
This graph shows the total measured precipitation in millimeters on 21 September in San Juan per year over the past years.
Snowfall on 21 September in San Juan per Year
This graph shows the total measured snowfall in centimeters on 21 September in San Juan per year over the past years.
Average weather in San Juan per month
Click on a month below to see in detail how the weather typically is in San Juan and what to expect. Based on the historical weather data of San Juan, you can view the average temperature, precipitation, wind, and UV index for each day of the month.