Panama City month by month, at a glance
Hover each month for the summary. Click to pin it.
In Panama City temperature does not tell the seasons apart: average highs run from 31.1 degrees in October and November to 33.4 in April. What does tell them apart, and radically, is the water that falls and, less obviously, the water underneath.
01 Two climates in one year
The figures are among the most contrasted on the continent. February accumulates 12.3 millimetres of rain over 1.6 days; October reaches 311.2 millimetres over 19.5 days. Between one month and the other the thermometer does not change: the number of usable afternoons does.
The dry season runs from mid-December to mid-April and here it is called summer, even though it falls in the middle of the northern winter. The wet season takes the rest and behaves predictably: clear mornings and afternoon downpours that hit hard and move on.
Average relative humidity swings between 68 and 85 per cent depending on the month, and that difference registers on the body far more than two degrees of temperature. In March the air dries; in October it does not.
Key moments at a glance
12.3 millimetres over fewer than two rainy days, with steady northerly wind.
Still dry, and the upwelling keeps the bay's water cool and productive.
Peak sightings of southern-hemisphere humpbacks, with afternoon rain.
311 millimetres over 19.5 rainy days: the year's ceiling.
02 The wind that dries and the sea that cools
The dry season does not arrive on its own. Between January and April northerly winds funnel through the low gap in the isthmus, exactly where the canal runs, and form a jet of air that sweeps the bay. That wind is what keeps the sky clear for weeks.
And it does something more: it pushes surface water offshore and drives an upwelling in the Gulf of Panama. Cold, nutrient-rich water rises, the sea drops several degrees and marine life takes off. It is an annual phenomenon documented for more than forty consecutive years.
In 2025 that upwelling failed to appear, for the first time on record, because of a shift in the wind pattern. The anomaly was studied and published in 2026, and it is worth knowing: it means the sea in this bay is no longer as predictable as its rainfall calendar.
03 Whales set the other calendar
Panama is one of the few places in the world where humpbacks from both hemispheres converge, and each group arrives in its own season. Between July and October those from the southern hemisphere come up, after feeding in Antarctic and Chilean waters.
Between December and April the northern ones arrive, from the North American Pacific coast. The southern group's sightings peak in August and September, when mothers with calves are seen close to the islands in the bay.
That breaks the rule you would otherwise assume. The rainiest months are not the empty ones: August and September are the best time of year to go out on the bay, even though it rains on nearly half the days.
04 October is the month you have to accept
With 311 millimetres and almost twenty rainy days, October does not allow a rigid plan. This is not a cyclone problem: the country lies outside the usual Caribbean hurricane corridor, and what dominates is the daily afternoon storm pattern.
The practical consequence is about the clock, not the calendar. In those months you walk the city in the morning and solve the afternoon indoors, and any trip out of town is scheduled early.
November keeps rain high, at 258.9 millimetres, and December is the hinge month: it drops to 124.6 and the dry wind starts to arrive mid-month. The first two weeks of December are still humid; the last two are not.
Here you do not choose a temperature, you choose how many afternoons you get to spend outdoors.
05 How to choose
If you want the dry city and a cool sea, go between January and March: it barely rains, the northerly wind blows and the upwelling keeps the bay active. It is the best window for combining the historic quarter with trips to the canal and the islands.
If whales are the priority, the window is August and September, and you have to accept the deal: green landscape, good mornings and wet afternoons. And if you can pick a single month, February wins for the simple reason that it has almost no rainy days.
