San Juan monthly weather averages
Average daytime temperature
The bar chart below shows the average monthly peak daytime temperatures at San Juan
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 24.1 | 24.8 | 25.8 | 26.4 | 25.8 | 25.1 | 24.9 | 24.9 | 24.9 | 24.8 | 24.5 | 24.2 |
| °F | 75.4 | 76.6 | 78.5 | 79.5 | 78.4 | 77.2 | 76.8 | 76.9 | 76.8 | 76.7 | 76 | 75.6 |
Please note: these are the average peak daytime temperatures (usually around mid-afternoon) so do not show daytime / night highs and lows. To see the daily range of temperatures have a look at the temperature max / min chart below.
Average rainfall & rainy days
The graph below shows the average rainfall and number of rainy days per month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| mm | 19 | 15 | 32 | 109 | 391 | 400 | 283 | 386 | 498 | 489 | 221 | 61 |
| inches | 0.8 | 0.6 | 1.2 | 4.3 | 15.4 | 15.7 | 11.1 | 15.2 | 19.6 | 19.2 | 8.7 | 2.4 |
| Rainy days | 12 | 9 | 8 | 10 | 19 | 24 | 23 | 23 | 24 | 23 | 18 | 15 |
Average annual rainfall in San Juan: 2827.433mm (1113.2 inches)
Average daily sunshine
The bar chart below shows the average daily sunshine hours in San Juan
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hrs sunshine | 7.3 | 7.7 | 7.8 | 7.7 | 7 | 6.8 | 6.7 | 6.5 | 6.2 | 6.1 | 6.4 | 6.9 |
Day / night temperatures
The graph below shows the daily range of temperatures for each month.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min °C | 16.1 | 16 | 16.8 | 17.6 | 17.8 | 17.7 | 17.8 | 17.7 | 17.8 | 17.4 | 17 | 16.6 |
| Max °C | 24.3 | 25 | 26.1 | 26.6 | 26 | 25.3 | 25.1 | 25.1 | 25.1 | 25 | 24.7 | 24.4 |
| Min °F | 61 | 60.8 | 62.2 | 63.7 | 64 | 63.9 | 64 | 63.9 | 64 | 63.3 | 62.5 | 61.9 |
| Max °F | 68.4 | 68.9 | 70.5 | 71.8 | 71.4 | 70.7 | 70.5 | 70.5 | 70.5 | 70.2 | 69.4 | 68.9 |
Sea temperature
The graph below shows the average sea temperature.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| °C | 27.8 | 27.8 | 28.2 | 28.8 | 29 | 28.9 | 28.6 | 28.7 | 28.8 | 28.5 | 28.1 | 27.9 |
| °F | 82 | 82.1 | 82.8 | 83.8 | 84.1 | 84 | 83.5 | 83.7 | 83.8 | 83.3 | 82.5 | 82.1 |
Wind speed
The graph below shows the average wind speed.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| km/h | 25 | 23 | 21 | 19 | 13 | 12 | 14 | 13 | 10 | 11 | 14 | 20 |
| mph | 15 | 15 | 13 | 12 | 8 | 7 | 9 | 8 | 7 | 7 | 9 | 12 |
A monthly average windspeed of over 16km/h or 10mph suggests a location is fairly windy.
Relative humidity
The graph below shows the average relative humidity.
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 78% | 76% | 76% | 78% | 82% | 83% | 84% | 84% | 85% | 85% | 83% | 80% |
Other monthly averages
San Juan weather stats
| Hottest month: | April | 26.4°C 79.5°F |
|---|---|---|
| Driest month: | February | 15mm 0.6ins |
| Sunniest month: | February | 7.7hrs |
| Coldest month: | January | 24.1°C 75.4°F |
| Wettest month: | September | 498mm 19.6ins |
| Warmest sea: | May | 29°C 84.2°F |
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