Climate averages 1991–2020
Retalhuleu weather
in May.
A hot, very wet month: the 5th warmest and the 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
May is a hot month in Retalhuleu: daytime highs average 29.8°C and nights cool to about 22.5°C. By daytime temperature it is the 5th warmest of the 12 months.
Expect about 351 mm of rain on roughly 27 days, which makes May a very wet month (the 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 12 h 48 min on an average May day.
The nearest other city in this atlas is Mazatenango (19 km away). In May its highs average 28.7°C, 1.1°C cooler than Retalhuleu, with 437 mm of rain.
Among the 23 cities listed in Guatemala, Retalhuleu ranks 4th of 23 for the warmest May highs and 20th of 23 for the driest May (rainfall, lowest first). The mean May high of those 23 cities is 26.3°C; Retalhuleu is 3.5°C warmer than that mean.
From May to June, average highs fall by 1.3°C to 28.5°C, and monthly rainfall rises from 351 mm to 374 mm.
The annual picture
May in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Retalhuleu climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 30.0°C20.3°C | 20.3°C | 18 | 4.9 | 11.411 h |
| February | 31.1°C20.7°C | 20.7°C | 15 | 3.8 | 11.712 h |
| March | 31.6°C21.6°C | 21.6°C | 36 | 8.4 | 12.012 h |
| April | 31.5°C22.4°C | 22.4°C | 93 | 14.4 | 12.512 h |
| May, selected | 29.8°C22.5°C | 22.5°C | 351 | 27.0 | 12.813 h |
| June | 28.5°C22.2°C | 22.2°C | 374 | 28.4 | 13.013 h |
| July | 28.9°C22.2°C | 22.2°C | 287 | 27.0 | 12.913 h |
| August | 28.8°C22.2°C | 22.2°C | 361 | 28.5 | 12.613 h |
| September | 28.1°C21.9°C | 21.9°C | 456 | 29.2 | 12.212 h |
| October | 27.7°C21.7°C | 21.7°C | 384 | 27.7 | 11.812 h |
| November | 28.3°C21.4°C | 21.4°C | 116 | 15.5 | 11.511 h |
| December | 29.2°C20.5°C | 20.5°C | 27 | 6.0 | 11.311 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
May in nearby cities
- Mazatenango in MayGuatemala · 19 kmHigh 28.7°C · Low 21.1°C · 437 mm rain
- Coatepeque in MayGuatemala · 27 kmHigh 27.6°C · Low 20.0°C · 607 mm rain
- Quetzaltenango in MayGuatemala · 38 kmHigh 19.9°C · Low 13.8°C · 550 mm rain
- Totonicapán in MayGuatemala · 54 kmHigh 20.4°C · Low 12.8°C · 175 mm rain
- Malacatán in MayGuatemala · 58 kmHigh 27.9°C · Low 19.0°C · 318 mm rain
- Santa Lucía Cotzumalguapa in MayGuatemala · 74 kmHigh 28.4°C · Low 20.5°C · 248 mm rain
- Tapachula in MayMexico · 75 kmHigh 29.8°C · Low 21.8°C · 414 mm rain
- Chichicastenango in MayGuatemala · 76 kmHigh 22.4°C · Low 14.0°C · 157 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Retalhuleu) is explained once on the Retalhuleu year overview and on the Sources, method and limits page.