San Salvador weather in May
In May, San Salvador has daytime highs averaging 29 °C, nights around 22 °C, with 25 wet days. Figures are 1991–2020 climate normals.
- 29.1°C Average high
- 21.7°C Average low
- 25days Wet days
- 221mm Rainfall
- 13h Daylight
Daily temperatures through May
How May develops
Averages for the first, middle and last part of the month, from daily 1991–2020 normals. Chance of rain is the share of years in which that calendar day recorded more than 1 mm.
| Days | Avg high | Avg low | Chance of rain |
|---|---|---|---|
| 1–10 May | 29.9 °C | 21.8 °C | 67 % |
| 11–20 May | 29.5 °C | 21.8 °C | 79 % |
| 21–31 May | 28.1 °C | 21.5 °C | 91 % |
- Average highs fall from 29.9 °C early in May to 28.1 °C by the end of it.
- Rain is most likely over days 21–31 of May (91 % of days) and least likely over days 1–10 (67 %).
What to expect
| Measure | Typical May | Share of the month |
|---|---|---|
| Days above 25 °C | 30 of 31 | 98 % |
| Days above 30 °C | 8.2 of 31 | 26 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 25 of 31 | 80 % |
Conditions in May
| Measure | Average |
|---|---|
| Mean temperature | 25 °C |
| Record high (1991–2020) | 36 °C |
| Record low (1991–2020) | 18 °C |
| Relative humidity | 81 % |
| Wind speed | 8.6 km/h |
| Cloud cover | 73 % |
May compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| March | 31.6 °C | 10 mm | 29 % |
| April | 31.0 °C | 49 mm | 45 % |
| May | 29.1 °C | 221 mm | 73 % |
| June | 28.2 °C | 246 mm | 84 % |
| July | 29.1 °C | 186 mm | 74 % |
See all twelve months for San Salvador
- May is the 6th warmest month here.
- It is the 8th driest month of the year.
- It ranks 7th for least cloud cover.
- Days last about 13 hours from sunrise to sunset.
- It rains on 25 of 31 days — 80 % of the month.
- Nights are about 7.4 °C cooler than the middle of the day.
- The hottest May day on record since 1991 reached 36 °C, 7.3 °C above the usual daytime high.
QuestionsMay in San Salvador, answered
How warm is San Salvador in May?
Daily highs average 29 °C and nights fall to about 22 °C, a spread of 7.4 °C between afternoon and dawn. That makes May the 3rd warmest month of the year here.
Does it rain much in San Salvador in May?
May averages 221 mm of rain, spread over about 25 of the 31 days — 80 % of the month. Cloud cover averages 73 % of the sky.
How long are the days in May?
San Salvador averages 13 hours between sunrise and sunset in May. Day length is computed from latitude and date, so it is exact rather than modelled — but it says nothing about how much of that time is sunny.
Data sources and method
- ERA5 / ERA5-Land reanalysis — Copernicus Climate Change Service (C3S), ECMWF. Copernicus Licence
- Open-Meteo — Open-Meteo.com. CC BY 4.0
- NOAA OISST v2.1 — NOAA Physical Sciences Laboratory. Public domain
- GeoNames — GeoNames.org. CC BY 4.0
- Normal period
- 1991–2020
- Dataset version
- era5-1991-2020-scores1.1
- Last processed
Measured values come from ERA5 reanalysis and are reproduced unchanged. Calculated by us: daylight hours, beach and comfort scores, monthly rankings, threshold day counts, chance of a wet day by date, ten-day averages within the month. Full formulas are on the methodology page.
Contains modified Copernicus Climate Change Service information 2026. Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data it contains.