Climate averages 1991–2020
San Juan, Peru weather
in January.
A hot, very wet month: the joint 3rd warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a hot month in San Juan, Peru: daytime highs average 30.0°C and nights cool to about 23.4°C. By daytime temperature it is the joint 3rd warmest of the 12 months.
Expect about 252 mm of rain on roughly 26 days, which makes January a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 19 min on an average January day.
The nearest other city in this atlas is Iquitos (4 km away). In January its highs average 30.0°C, about as warm as San Juan, Peru, with 252 mm of rain.
Among the 24 cities listed in Peru, San Juan, Peru ranks joint 3rd of 24 for the warmest January highs and joint 21st of 24 for the driest January (rainfall, lowest first). The mean January high of those 24 cities is 25.1°C; San Juan, Peru is 4.9°C warmer than that mean.
From January to February, average highs stay level at 30.0°C, and monthly rainfall falls from 252 mm to 235 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Iquitos in JanuaryPeru · 4 kmHigh 30.0°C · Low 23.4°C · 252 mm rain
- Cruzeiro do Sul in JanuaryBrazil · 433 kmHigh 29.6°C · Low 22.7°C · 239 mm rain
- Pucallpa in JanuaryPeru · 531 kmHigh 29.8°C · Low 23.3°C · 302 mm rain
- Cuenca in JanuaryEcuador · 642 kmHigh 18.1°C · Low 11.5°C · 146 mm rain
- Florencia in JanuaryColombia · 653 kmHigh 28.2°C · Low 18.7°C · 86 mm rain
- Loja in JanuaryEcuador · 658 kmHigh 20.9°C · Low 14.8°C · 167 mm rain
- Pitalito in JanuaryColombia · 698 kmHigh 23.3°C · Low 14.8°C · 209 mm rain
- Ipiales in JanuaryColombia · 705 kmHigh 16.0°C · Low 9.3°C · 220 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.