Climate of Panama: Tropical, Seasonal, and Modulated by ENSO

A tropical baseline, with a sharp rainfall split

Mean annual air temperature in Panama varies with elevation more than with latitude. The coasts sit near 27 °C year-round; Panama City averages about 27.5 °C; the central cordillera drops the mean to 18–22 °C; and the highest elevations on Volcán Barú and the Cerro Picacho massif reach overnight lows that occasionally brush 5 °C during the dry-season nortes (cool north winds). Frost is essentially absent at elevations below 3,000 m and the annual temperature range rarely exceeds 4 °C.

The interesting variable is rainfall. The country averages around 1,800–2,300 mm/year nationally, but the per-station range runs from below 1,500 mm in the Arco Seco (the dry arc on the Pacific side from southern Veraguas through Coclé and into Herrera and Los Santos) to over 4,000 mm in the upper Caribbean catchments of the Chagres, the Santa María basin, and the eastern cordillera facing Colón. The Smithsonian Tropical Research Institute’s national stations layer (operated jointly by ETESA, ACP, and STRI) is the canonical reference for current conditions^[2].

Two oceans, two rainy seasons

What most readers mean by “Panama’s climate” is really two different climates that share a country:

• Caribbean side. Rain year-round, with a short veranillo (literally “little summer,” a brief mid-summer dry spell in July–August) and a slightly less-rainy window from February through April. Annual totals commonly 3,000–5,000 mm; some ridge stations exceed 6,000 mm. The northeast trade winds drive moisture onshore continuously.
• Pacific side. A pronounced dry season from roughly mid-December to mid-April. The dry season is not absolute, cloudy days and short showers still occur, but cumulatively December through April delivers less than 10 % of the annual total in the Arco Seco. The invierno (rainy season) ramps up in May and runs through November.

The cordillera is what creates this split: the northeast trade winds dump their moisture on the windward (Caribbean) slopes, leaving a rain shadow for the Pacific lowlands. The contrast is most extreme in central Panama, where Chiriquí’s Burica Peninsula and the eastern Azuero coast face the Pacific but the cordillera’s bulk sits only 50–80 km to the north.

The seasonal cycle in detail

The year has four recognisable periods on the Pacific side, two on the Caribbean side:

The veranillo is not as reliable as the main dry season. In some years it disappears entirely; in others it gives the Pacific side a useful two-week break in the middle of the invierno for coffee harvest, sugarcane ripening, and road maintenance.

Temperature by elevation

Panama’s mean temperature lapse rate is close to the standard tropical value of about 0.6 °C per 100 m. That gives a clean three-band reading:

• Lowlands (sea level to ~500 m): mean 26–28 °C year-round. Diurnal range 7–10 °C. The Pacific lowlands run 1–2 °C hotter than the Caribbean lowlands in the dry season because the clear skies allow stronger solar heating.
• Mid-elevations (500–1,500 m): mean 22–25 °C. The coffee belt of Chiriquí (Boquete, Volcán, Renacimiento) sits here and has the country’s most temperate climate (a tourist draw, not just an agricultural one).
• Highlands (1,500 m and above): mean below 20 °C. Above 2,000 m the cordillera has cool-tolerant cloud forest; Volcán Barú’s summit can drop to freezing on the coldest dry-season nights.

Heat extremes are rare. The hottest reading at Tocumen International Airport is around 39 °C; the hottest typical afternoon in the Pacific lowlands is around 33–35 °C.

ENSO: the climate wildcard

The El Niño–Southern Oscillation is the dominant mode of year-to-year climate variability for Panama, and NOAA’s Climate Prediction Center tracks it with the Oceanic Niño Index (ONI): a 3-month running mean of ERSST.v5 sea-surface-temperature anomalies in the Niño 3.4 region (5 °N–5 °S, 120–170 °W), with El Niño declared when the index rises above +0.5 °C and La Niña when it falls below −0.5 °C for at least five consecutive overlapping seasons^[1].

The Panama-specific impacts (mediated through Caribbean SST anomalies, the Walker circulation, and shifts in the Inter-Tropical Convergence Zone) are consistent enough to plan around:

• El Niño years tend to bring a drier-than-average invierno on the Pacific side, with a delayed onset in May and a sharper-than-usual dry season the following year. The Caribbean side is less directly affected.
• La Niña years tend to bring a wetter, longer invierno on the Pacific side, more frequent floods in the lowland river basins, and slightly higher Atlantic hurricane activity reaching the western Caribbean.
• Neutral years sit closer to the long-term mean.

The strongest recent event was the 2023–2024 El Niño, which peaked at ONI +2.1 in December 2023 and weakened through 2024 (peaks of +1.9 in January)^[1]. The 2025 neutral/weak La Niña conditions (ONI range −0.1 to −0.6) brought a closer-to-average invierno but still a sharp Caribbean-side wet season. The canonical ENSO-vs-Panama-rainfall relationship is strong enough to be useful for planning but not strong enough to override local convective variability.

Hurricanes, tropical storms, and the Panama exception

Panama lies south of the main Atlantic hurricane belt, almost the entire country is below 10 °N, and a direct hurricane landfall is rare. The Atlantic side does receive tropical-storm-force winds and extreme rainfall from systems that pass through the southwestern Caribbean (most often in October and November), and the Pacific side can see the southern fringes of eastern-Pacific tropical storms. The dedicated hurricane-risk page covers the climatology in detail.

Climate change: what is shifting

The climate is not static. Caribbean-side SSTs are rising in step with the global trend; ENSO events are happening in a generally warmer baseline; and the Arco Seco has shown a lengthening of its dry-season duration in the past two decades, contributing to Canal-watershed water-supply stress that prompted ACP water-management investment in the mid-2020s. The environmental-challenges and guna-yala-climate-crisis pages cover the climate-displacement and ecological-side stories.

How to read the climate data

Panama has comprehensive meteorological coverage through the joint ETESA + ACP + STRI network^[2], and the country’s Plan Nacional de Gestión Integrada de Recursos Hídricos 2010-2030 (the national integrated water-resources management plan, ANAM) is the authoritative policy document for water allocation and climate adaptation^[3]. For real-time conditions, ETESA publishes daily station data; for climate normals and trends, ACP publishes monthly summaries; for research-grade data, STRI’s Barro Colorado Island station (in place since 1929) is one of the longest tropical-forest climate records in the world.

When to skip and when to read on

If you only have a minute, the most important climate facts are: temperatures are warm everywhere year-round and cool only with elevation; rainfall is split sharply between a perhumid Caribbean and a seasonally dry Pacific; and the year-to-year variability is dominated by ENSO, with El Niño years tending drier and La Niña years wetter on the Pacific side. The climate-by-region page breaks this down by province; rainy-season-guide covers the monthly calendar; and hurricane-risk covers the tropical-cyclone side.

How Panama’s climate compares to its neighbours

Panama’s climate is shaped by the same trade-wind + cordillera + ocean-current system that defines most of Central America’s Pacific and Caribbean coasts, but its position at the narrow southern end of the isthmus gives it some distinctive features:

• Two relatively moderate Pacific dry arcs. Unlike Guatemala, El Salvador, or Nicaragua, Panama’s Pacific side receives substantial rainfall on the upper cordillera slopes (1,500–2,500 mm/year) before the Arco Seco sets in further south. The result is a smaller and less extreme Pacific dry-arc than Central America’s northwest.
• A perhumid Caribbean side. The same trade-wind regime that brings rain to the Caribbean slopes of Costa Rica also drenches Panama’s Caribbean, but Panama’s narrower landmass means the rain shadow on the Pacific side is sharper.
• Bimodal seasonal patterns. Unlike the Caribbean islands to the east, which have a single annual rainfall peak, Panama’s Pacific side has a more complex bimodal pattern with the veranillo (mid-summer dry interlude) breaking up the invierno. This is rare in the Caribbean but characteristic of Pacific Central America.

These differences make Panama’s climate a transitional type between the Caribbean-island pattern to the east and the Mexican/Central American Pacific pattern to the north and west.

What the station network actually shows

The Panamanian station network has been built out over more than a century and now includes several hundred stations covering temperature, precipitation, river flow, soil moisture, and (at the major airports) wind and visibility. The network’s three principal operators contribute different strengths:

• ETESA (Empresa de Transmisión Eléctrica). ETESA’s network is the largest and most continuous; it operates for hydrological and electricity-sector purposes and is the reference for river flow and reservoir inflow data. ETESA publishes daily summaries that are widely used by agricultural planners and water utilities.
• ACP (Autoridad del Canal de Panamá). ACP’s network focuses on the canal watershed (the Chagres basin, Gatún Lake, and adjacent areas) and is the most precise for those locations. ACP’s data feeds the canal’s operational planning and the broader water-supply management for Panama City and Colón.
• STRI (Smithsonian Tropical Research Institute). STRI maintains a smaller number of research-grade stations, with the longest continuous record at Barro Colorado Island (in place since 1929). STRI’s stations are the canonical reference for tropical-forest microclimate and for the canal-area research literature.

The combined STRI GIS portal layer that integrates these networks is the canonical reference for any site-specific climate question.

Quick reference: Panama climate at a glance

Last reviewed: 2026-07-03