Iquitos has no cold season and no truly dry one, but it does have a rhythm. The temperature stays hot and humid all year, rain can fall in any month, and the rivers rise and fall in a regular cycle. That cycle, more than the weather, changes what you see and how you travel. This guide explains the seasons and how to choose.
The basics
Temperatures in Iquitos are high throughout the year, usually in the upper twenties to the low thirties Celsius, with high humidity. Afternoon storms are common, and heavy rain can arrive in any month. The wetter period runs roughly from November to May, and the drier period from June to October, but the difference is gradual and the pattern changes from year to year. There is never a bad time to see the Amazon, only different experiences.
High water
From around December to May, the rivers rise, sometimes by many meters, and the forest floods. Canoes glide among the trunks, lagoons expand and fish and wildlife spread out. This is the best time for paddling deep into the flooded forest, for seeing pink dolphins in the channels and for visiting stilted communities by boat. Some trails are underwater, and animals are more dispersed, so walking wildlife viewing may be harder. In Iquitos itself, the floating houses of Belen float, and the market shifts with the water.
Low water
From around June to October, the rivers fall, beaches and sandbars appear, channels narrow and trails open in the forest. Wildlife concentrates along the remaining water, which can make viewing easier, and birdwatching is often excellent. Walks and hikes are more common than canoe trips, and the stilted houses of Belen stand high above the ground. Some smaller channels become impassable, so itineraries change. Days are generally somewhat sunnier and the nights a little cooler.
Transitions
The months between the two extremes, around May to June and October to November, give a mix of conditions, with changing water levels and variable weather. These months can be rewarding, since crowds are smaller and prices can be lower, but plans need more flexibility. Operators will adjust routes to the river level, so ask what to expect on your dates, and keep an open mind.
Crowds and prices
The busiest periods for visitors tend to be the drier months and holiday weeks in Peru and abroad, when flights and cruises fill up. Book early for those periods. In quieter months you may find lower rates, more availability and a more relaxed atmosphere. Festivals such as the San Juan celebrations in June bring local color and busy hotels, so book ahead if you plan to be there.
Wildlife through the year
Pink and grey dolphins, monkeys, sloths, caimans and birds are present year round. Migratory birds appear at certain times, fruiting trees draw parrots and monkeys, and fish move with the water. No season guarantees a sighting, and luck and a good guide matter more than the month. Choose your dates according to the type of experience you want, such as canoe trips or walks, and then choose an operator you trust.
What to pack
Bring lightweight long-sleeved clothes, quick-drying trousers, a rain jacket or poncho, a hat, sunglasses, strong repellent, sunscreen and closed shoes with good grip. A dry bag protects cameras and phones. In low water, bring sturdy boots for walks, and in high water, shoes that can get wet. Carry a reusable bottle, a headlamp and a small first-aid kit, and be ready for heat, humidity and sudden rain.
Choosing
If you want flooded forest canoeing, choose high water. If you want walking trails and concentrated wildlife, choose low water. If you want flexibility, go whenever your schedule allows and let a good operator shape the program. Build in a spare day for delays, travel with insurance and enjoy the extraordinary moving landscape of the Amazon.
Planning around the water
Operators know the river levels well and can tell you how they expect conditions to look on your dates. Ask whether the lodge or reserve is accessible by canoe or on foot, how long the transfers take and whether any activities depend on the level. A flexible itinerary with a spare day absorbs most surprises, and a good guide turns whatever the river gives you into a worthwhile day.