Petatlán climate — normals and trends
Petatlán (Mexico) has a tropical savanna climate (Aw) under the Köppen-Geiger classification. Its mean annual temperature is 25.2 °C and it receives 1,404 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 May (26.3 °C on average) and the coldest is January (23.8 °C). Rainfall peaks in September.
Petatlán averages 0 frost days, 86 hot days (≥ 30 °C) and 125 rainy days per year.
Petatlán has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The hottest day of the period reached 34.4 °C (on 12 May 2002) and the coldest 14.8 °C (on 24 February 1965).
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
PetatlánGuerrero
- coords
- 17.54°, -101.27°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
25.2°C
Average daily high
28.8°C
Average daily low
21.8°C
Annual rainfall
1,404mm
Sunshine / day
10.6h
Mean relative humidity
78%
Average peak wind
10.9km/h
Seasonal range
2.5°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
86 d/yr
Rainy days (≥ 1 mm)
125 d/yr
Annual snowfall
0.0 cm
Average feels-like high
33.4 °C
Average feels-like low
25.0 °C
Average peak gust
28.5 km/h
Tropical nights (≥ 20 °C)
289 d/yr
Solar radiation
20.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.72 · 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
34.4 °C
12 May 2002
Coldest day
14.8 °C
24 February 1965
Wettest day
354 mm
16 September 1988
Windiest day
43.5 km/h
17 June 1971
Strongest gust
104.8 km/h
17 June 1971
Hottest feels-like
40.8 °C
12 October 2000
Coldest feels-like
15.1 °C
24 February 1965
Sunniest day
12.8 h
21 May 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 29.1 °C | +0.9 °C | 22 mm | +10 mm |
| Feb | 29.5 °C | +0.9 °C | 1 mm | -3 mm |
| Mar | 29.2 °C | +0.1 °C | 0 mm | -3 mm |
| Apr | 29.3 °C | -0.5 °C | 0 mm | -1 mm |
| May | 30.6 °C | +0.3 °C | 12 mm | -10 mm |
| Jun | 29.5 °C | +0.4 °C | 376 mm | +136 mm |
| Jul | 30.8 °C | +1.8 °C | 92 mm | -150 mm |
| Aug | 30.4 °C | +1.6 °C | 113 mm | -153 mm |
| Sep | 29.7 °C | +1.5 °C | 231 mm | -124 mm |
| Oct | 29.5 °C | +1.1 °C | 256 mm | +42 mm |
| Nov | 29.9 °C | +1.5 °C | 3 mm | -35 mm |
| Dec | 30.0 °C | +1.8 °C | 2 mm | -5 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 Petatlán?
Petatlán has a tropical savanna climate (Köppen Aw). Over 1940-2025, the average annual temperature is 25.2 °C and it receives 1,404 mm of precipitation per year.
What is the hottest day ever recorded in Petatlán?
The hottest day measured in Petatlán between 1940 and 2025 was 12 May 2002, reaching 34.4 °C.
What is the coldest day in Petatlán?
The coldest day measured in Petatlán between 1940 and 2025 was 24 February 1965, at 14.8 °C.
Does it snow in Petatlán?
Almost never: Petatlán sees virtually no snow, with about 0 frost days per year.
Has the climate of Petatlán warmed?
Yes: Petatlán warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Petatlán?
The wettest day measured in Petatlán between 1940 and 2025 was 16 September 1988, with 354 mm of rain in 24 hours.
What was the windiest day in Petatlán?
The windiest day measured in Petatlán between 1940 and 2025 was 17 June 1971, with winds reaching 43.5 km/h.
What is the warmest month in Petatlán?
The warmest month in Petatlán is May (26.3 °C on average); the coldest is January (23.8 °C).
How much does it rain in Petatlán?
Petatlán receives on average 1,404 mm of precipitation per year, spread over about 125 rainy days.
Is it sunny in Petatlán?
Petatlán gets on average 10.6 hours of sunshine per day, roughly 3,869 hours per year over 1940-2025.
Are there tropical nights in Petatlán?
Yes: Petatlán has on average 289 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Petatlán?
In Petatlán, between 1940 and 2025, the highest apparent temperature reached 40.8 °C on 12 October 2000, and the lowest was 15.1 °C on 24 February 1965.
Compare Petatlán with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Petatlán