The rain is here – months earlier than expected! Unusual amounts of water are falling in Tumbes and Piura, and weather records are being broken. And of all times, the truly critical phase is only just beginning.
Northern Peru is looking nervously at the sky. Tumbes and Piura are reporting unusually heavy rainfall. Behind this weather pattern is El Niño Costero – and it is already showing its strength. The crucial question is: What else is in store for the north of Peru in the coming months?
Weather alert for the north!
Further precipitation is expected from October 2 to 4, 2026. Affected areas include Tumbes, Piura, Lambayeque, La Libertad, Cajamarca, and Amazonas. In the northern Sierra, heavy rainfall may be accompanied by thunderstorms and strong wind gusts. Hail is even possible at higher altitudes.
All eyes are on Tumbes and Piura in particular. There, the weather has already impressively demonstrated the amounts of rain currently possible.
78.5 liters of rain per square meter!
The figures from Tumbes are staggering. At the Cañaveral weather station, 78.5 millimeters of rain were measured within 24 hours. This corresponds to 78.5 liters of water on every square meter. In Cabo Inga, there were also an enormous 72 millimeters.
For this time of year, such rainfall amounts are extraordinary. They show how much the weather situation on the north coast has already changed.
Piura breaks an old weather record
There is also a remarkable reading from Piura. In El Alto near Talara, 13.5 millimeters of rain fell within a single day. Compared to the figures from Tumbes, this may seem unspectacular at first, but a historical comparison shows the opposite.
The previous September record for this weather station was just 3 millimeters, dating back to 1977. The old record has thus been significantly surpassed.
The sea off Tumbes and Piura is unusually warm
Attention is therefore also turning to the Pacific. Unusually high sea temperatures and significant positive deviations from the long-term average have been recorded off Tumbes and Piura.
The warm sea plays a decisive role in weather development. It can provide large amounts of moisture and thus promote heavy rainfall. Northern Peru is now feeling exactly these conditions.
El Niño is bringing the rainy season forward
The timing is particularly explosive. The current development of El Niño Costero coincides with an unusually early occurrence of heavy precipitation on the north coast.
Individual heavy rain events are expected for October. From November onwards, precipitation on the north coast could become more frequent and above average. Tumbes and Piura in particular must monitor the situation closely.
El Niño remains exceptionally strong
ENFEN is maintaining its El Niño Costero warning. For the period up to January 2027, the expert committee sees the highest probability for an extraordinary development in the Niño 1+2 region. Afterward, the event may remain strong to extraordinary at first before gradually weakening later on.
However, it is impossible to predict months in advance just how strong individual rain events will actually be for a specific location. Forecasts are therefore being continuously updated based on new measurement data.
Rivers and gullies are now becoming a problem
Heavy rain alone is not the only danger. In northern Peru, normally dry gullies can carry large volumes of water in a very short time. Rivers can swell, and roads can be damaged or temporarily impassable. The situation becomes particularly problematic when several heavy rain events occur in quick succession.
Authorities are therefore preparing for the remainder of the rainy season. Measures are focused, among other things, on critical river sections, drainage, and particularly vulnerable areas in the northern regions.
What does this mean for travelers?
There is no reason to cancel trips to northern Peru across the board just yet. Nevertheless, visitors should take the current weather situation seriously. Especially when traveling into the hinterland and the mountains, one should check whether roads and bridges are passable before departing.
Current warnings from SENAMHI and INDECI are more important than long-term weather forecasts. This applies particularly to travelers in Tumbes, Piura, Lambayeque, Cajamarca, and Amazonas.
Northern Peru must prepare for a difficult summer
The first figures already provide a foretaste: 78.5 millimeters in Cañaveral, 72 millimeters in Cabo Inga, and a broken September record in El Alto. And all of this is happening before the typically rainiest months have even been reached.
This is precisely why authorities and weather experts are now watching northern Peru with particular attention. The decisive months are yet to come.
PeruMagazin continues to monitor the weather situation in Tumbes, Piura, and the other regions of northern Peru.
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Servicio Nacional de Meteorología e Hidrología del Perú (SENAMHI), Meteorological Warning No. 392, September/October 2026.
Multisectoral Committee ENFEN, Official Communiqués No. 16 and 17-2026, September 2026.
Agencia Andina, reports on rainfall and El Niño Costero, September/October 2026.
Hero stock photo: Río Piura, taken February 7, 2025, El Surquillano, Wikimedia Commons, CC0/Public Domain. The photo does not show the current storm.
