Climate averages 1991–2020
San Juan, Peru weather
in October.
A hot, very wet month: the warmest and the 4th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
October is a hot month in San Juan, Peru: daytime highs average 30.3°C and nights cool to about 23.5°C. By daytime temperature it is the warmest month of the year.
Expect about 201 mm of rain on roughly 26 days, which makes October a very wet month (the 4th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 11 min on an average October day.
The nearest other city in this atlas is Iquitos (4 km away). In October its highs average 30.2°C, about as warm as San Juan, Peru, with 201 mm of rain.
Among the 24 cities listed in Peru, San Juan, Peru ranks joint 1st of 24 for the warmest October highs and joint 21st of 24 for the driest October (rainfall, lowest first). The mean October high of those 24 cities is 23.6°C; San Juan, Peru is 6.7°C warmer than that mean.
From October to November, average highs fall by 0.4°C to 29.9°C, and monthly rainfall rises from 201 mm to 235 mm.
The annual picture
October 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 | 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, selected | 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
October in nearby cities
- Iquitos in OctoberPeru · 4 kmHigh 30.2°C · Low 23.4°C · 201 mm rain
- Cruzeiro do Sul in OctoberBrazil · 433 kmHigh 30.3°C · Low 22.7°C · 176 mm rain
- Pucallpa in OctoberPeru · 531 kmHigh 30.3°C · Low 23.3°C · 226 mm rain
- Cuenca in OctoberEcuador · 642 kmHigh 18.6°C · Low 10.9°C · 127 mm rain
- Florencia in OctoberColombia · 653 kmHigh 27.2°C · Low 18.3°C · 164 mm rain
- Loja in OctoberEcuador · 658 kmHigh 22.1°C · Low 14.4°C · 88 mm rain
- Pitalito in OctoberColombia · 698 kmHigh 23.2°C · Low 14.4°C · 230 mm rain
- Ipiales in OctoberColombia · 705 kmHigh 16.3°C · Low 9.0°C · 230 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.