Guayama climate — normals and trends
Guayama (Puerto Rico) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.1 °C and it receives 1,203 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 August (26.3 °C on average) and the coldest is February (23.5 °C). Rainfall peaks in September.
Guayama averages 0 frost days, 0 hot days (≥ 30 °C) and 260 rainy days per year.
Guayama has warmed by +1.2 °C between 1940 and 2025, or +0.14 °C per decade. This trend is statistically significant.
The hottest day of the period reached 30.7 °C (on 18 June 2024) and the coldest 19.0 °C (on 12 March 1951).
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
GuayamaGuayama
- coords
- 17.98°, -66.11°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.1°C
Average daily high
26.6°C
Average daily low
23.7°C
Annual rainfall
1,203mm
Sunshine / day
11.3h
Mean relative humidity
83%
Average peak wind
20.2km/h
Seasonal range
2.8°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
260 d/yr
Annual snowfall
0.0 cm
Average feels-like high
30.1 °C
Average feels-like low
26.2 °C
Average peak gust
36.8 km/h
Tropical nights (≥ 20 °C)
364 d/yr
Solar radiation
20.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.2 °C
since 1940
+0.1 °C per decade · r² = 0.66 · 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
30.7 °C
18 June 2024
Coldest day
19.0 °C
12 March 1951
Wettest day
221 mm
11 May 1986
Windiest day
76.3 km/h
20 September 2017
Strongest gust
142.2 km/h
20 September 2017
Hottest feels-like
37.7 °C
6 September 1989
Coldest feels-like
16.9 °C
16 January 2000
Sunniest day
13.0 h
14 June 1940
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 | 26.3 °C | +1.2 °C | 49 mm | -2 mm |
| Feb | 25.9 °C | +0.8 °C | 60 mm | +15 mm |
| Mar | 26.1 °C | +0.8 °C | 65 mm | +17 mm |
| Apr | 26.3 °C | +0.3 °C | 118 mm | +44 mm |
| May | 27.3 °C | +0.7 °C | 142 mm | +12 mm |
| Jun | 27.6 °C | +0.3 °C | 53 mm | -55 mm |
| Jul | 27.8 °C | +0.2 °C | 80 mm | -37 mm |
| Aug | 28.5 °C | +0.7 °C | 104 mm | -34 mm |
| Sep | 28.4 °C | +0.6 °C | 220 mm | +55 mm |
| Oct | 28.3 °C | +0.8 °C | 156 mm | 0 mm |
| Nov | 27.4 °C | +0.6 °C | 118 mm | +6 mm |
| Dec | 26.4 °C | +0.6 °C | 42 mm | -18 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 Guayama?
Guayama has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.1 °C and it receives 1,203 mm of precipitation per year.
What is the hottest day ever recorded in Guayama?
The hottest day measured in Guayama between 1940 and 2025 was 18 June 2024, reaching 30.7 °C.
What is the coldest day in Guayama?
The coldest day measured in Guayama between 1940 and 2025 was 12 March 1951, at 19.0 °C.
Does it snow in Guayama?
Almost never: Guayama sees virtually no snow, with about 0 frost days per year.
Has the climate of Guayama warmed?
Yes: Guayama warmed by +1.2 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Guayama?
The wettest day measured in Guayama between 1940 and 2025 was 11 May 1986, with 221 mm of rain in 24 hours.
What was the windiest day in Guayama?
The windiest day measured in Guayama between 1940 and 2025 was 20 September 2017, with winds reaching 76.3 km/h.
What is the warmest month in Guayama?
The warmest month in Guayama is August (26.3 °C on average); the coldest is February (23.5 °C).
How much does it rain in Guayama?
Guayama receives on average 1,203 mm of precipitation per year, spread over about 260 rainy days.
Is it sunny in Guayama?
Guayama gets on average 11.3 hours of sunshine per day, roughly 4,125 hours per year over 1940-2025.
Are there tropical nights in Guayama?
Yes: Guayama has on average 364 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Guayama?
In Guayama, between 1940 and 2025, the highest apparent temperature reached 37.7 °C on 6 September 1989, and the lowest was 16.9 °C on 16 January 2000.
Compare Guayama with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Guayama