Arraiján climate — normals and trends
Arraiján (Panama) has a tropical monsoon climate (Am) under the Köppen-Geiger classification. Its mean annual temperature is 26.1 °C and it receives 2,219 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is April (26.6 °C on average) and the coldest is November (25.6 °C). Rainfall peaks in July.
Arraiján averages 0 frost days, 47 hot days (≥ 30 °C) and 275 rainy days per year.
Arraiján has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The hottest day of the period reached 32.5 °C (on 19 April 1941) and the coldest 21.1 °C (on 9 March 1940).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
ArraijánPanamá Oeste Province
- coords
- 8.94°, -79.64°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
26.1°C
Average daily high
28.8°C
Average daily low
24.3°C
Annual rainfall
2,219mm
Sunshine / day
9.4h
Mean relative humidity
85%
Average peak wind
14.3km/h
Seasonal range
1.0°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
47 d/yr
Rainy days (≥ 1 mm)
275 d/yr
Annual snowfall
0.0 cm
Average feels-like high
34.2 °C
Average feels-like low
28.3 °C
Average peak gust
27.6 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
17.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.63 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
32.5 °C
19 April 1941
Coldest day
21.1 °C
9 March 1940
Wettest day
151 mm
17 May 1973
Windiest day
32.6 km/h
5 February 2009
Strongest gust
57.6 km/h
19 October 1988
Hottest feels-like
40.5 °C
18 June 2023
Coldest feels-like
21.6 °C
13 March 1989
Sunniest day
12.3 h
25 July 2015
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 29.7 °C | +1.0 °C | 88 mm | +50 mm |
| Feb | 30.0 °C | +1.0 °C | 70 mm | +47 mm |
| Mar | 30.3 °C | +0.9 °C | 19 mm | -5 mm |
| Apr | 29.8 °C | +0.3 °C | 170 mm | +80 mm |
| May | 29.8 °C | +0.8 °C | 308 mm | +63 mm |
| Jun | 29.2 °C | +0.4 °C | 341 mm | +53 mm |
| Jul | 29.7 °C | +1.0 °C | 335 mm | +32 mm |
| Aug | 29.6 °C | +0.9 °C | 259 mm | -28 mm |
| Sep | 29.2 °C | +0.5 °C | 284 mm | +13 mm |
| Oct | 29.1 °C | +0.7 °C | 262 mm | -30 mm |
| Nov | 28.8 °C | +0.7 °C | 334 mm | +95 mm |
| Dec | 28.9 °C | +0.5 °C | 128 mm | +9 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of Arraiján?
Arraiján has a tropical monsoon climate (Köppen Am). Over 1940-2025, the average annual temperature is 26.1 °C and it receives 2,219 mm of precipitation per year.
What is the hottest day ever recorded in Arraiján?
The hottest day measured in Arraiján between 1940 and 2025 was 19 April 1941, reaching 32.5 °C.
What is the coldest day in Arraiján?
The coldest day measured in Arraiján between 1940 and 2025 was 9 March 1940, at 21.1 °C.
Does it snow in Arraiján?
Almost never: Arraiján sees virtually no snow, with about 0 frost days per year.
Has the climate of Arraiján warmed?
Yes: Arraiján warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Arraiján?
The wettest day measured in Arraiján between 1940 and 2025 was 17 May 1973, with 151 mm of rain in 24 hours.
What was the windiest day in Arraiján?
The windiest day measured in Arraiján between 1940 and 2025 was 5 February 2009, with winds reaching 32.6 km/h.
What is the warmest month in Arraiján?
The warmest month in Arraiján is April (26.6 °C on average); the coldest is November (25.6 °C).
How much does it rain in Arraiján?
Arraiján receives on average 2,219 mm of precipitation per year, spread over about 275 rainy days.
Is it sunny in Arraiján?
Arraiján gets on average 9.4 hours of sunshine per day, roughly 3,431 hours per year over 1940-2025.
Are there tropical nights in Arraiján?
Yes: Arraiján has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Arraiján?
In Arraiján, between 1940 and 2025, the highest apparent temperature reached 40.5 °C on 18 June 2023, and the lowest was 21.6 °C on 13 March 1989.
Compare Arraiján with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arraiján