Climate averages 1991–2020
San Juan, Peru weather
in August.
A hot, wet month: the joint 8th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a hot month in San Juan, Peru: daytime highs average 29.4°C and nights cool to about 22.5°C. By daytime temperature it is the joint 8th warmest of the 12 months.
Expect about 154 mm of rain on roughly 22 days, which makes August a wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 59 min on an average August day.
The nearest other city in this atlas is Iquitos (4 km away). In August its highs average 29.3°C, about as warm as San Juan, Peru, with 154 mm of rain.
Among the 24 cities listed in Peru, San Juan, Peru ranks 3rd of 24 for the warmest August highs and joint 23rd of 24 for the driest August (rainfall, lowest first). The mean August high of those 24 cities is 22.8°C; San Juan, Peru is 6.6°C warmer than that mean.
From August to September, average highs rise by 0.7°C to 30.1°C, and monthly rainfall rises from 154 mm to 179 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
San Juan, Peru climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.0°C23.4°C | 23.4°C | 252 | 25.9 | 12.312 h |
| February | 30.0°C23.5°C | 23.5°C | 235 | 24.7 | 12.212 h |
| March | 29.9°C23.5°C | 23.5°C | 304 | 28.4 | 12.112 h |
| April | 29.4°C23.3°C | 23.3°C | 294 | 27.3 | 12.012 h |
| May | 28.8°C22.9°C | 22.9°C | 271 | 26.7 | 11.912 h |
| June | 28.2°C22.4°C | 22.4°C | 218 | 25.0 | 11.912 h |
| July | 28.3°C22.1°C | 22.1°C | 165 | 23.3 | 11.912 h |
| August, selected | 29.4°C22.5°C | 22.5°C | 154 | 21.8 | 12.012 h |
| September | 30.1°C23.1°C | 23.1°C | 179 | 23.5 | 12.112 h |
| October | 30.3°C23.5°C | 23.5°C | 201 | 25.8 | 12.212 h |
| November | 29.9°C23.5°C | 23.5°C | 235 | 25.8 | 12.312 h |
| December | 29.9°C23.4°C | 23.4°C | 263 | 27.2 | 12.312 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Iquitos in AugustPeru · 4 kmHigh 29.3°C · Low 22.4°C · 154 mm rain
- Cruzeiro do Sul in AugustBrazil · 433 kmHigh 30.2°C · Low 21.6°C · 71 mm rain
- Pucallpa in AugustPeru · 531 kmHigh 30.2°C · Low 22.3°C · 99 mm rain
- Cuenca in AugustEcuador · 642 kmHigh 16.8°C · Low 9.0°C · 54 mm rain
- Florencia in AugustColombia · 653 kmHigh 26.1°C · Low 17.7°C · 121 mm rain
- Loja in AugustEcuador · 658 kmHigh 20.7°C · Low 12.8°C · 24 mm rain
- Pitalito in AugustColombia · 698 kmHigh 21.6°C · Low 13.2°C · 231 mm rain
- Ipiales in AugustColombia · 705 kmHigh 14.7°C · Low 7.7°C · 94 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for San Juan) is explained once on the San Juan, Peru year overview and on the Sources, method and limits page.
Iquitos lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.