Santarém weather in May
In May, Santarém has daytime highs averaging 28 °C, nights around 25 °C, with 30 wet days. Figures are 1991–2020 climate normals.
- 28.4°C Average high
- 24.5°C Average low
- 30days Wet days
- 375mm Rainfall
- 12h 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 | 28.2 °C | 24.4 °C | 97 % |
| 11–20 May | 28.5 °C | 24.6 °C | 96 % |
| 21–31 May | 28.4 °C | 24.6 °C | 93 % |
What to expect
| Measure | Typical May | Share of the month |
|---|---|---|
| Days above 25 °C | 31 of 31 | 100 % |
| Days above 30 °C | 1.3 of 31 | 4 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 30 of 31 | 95 % |
Conditions in May
| Measure | Average |
|---|---|
| Mean temperature | 26 °C |
| Record high (1991–2020) | 32 °C |
| Record low (1991–2020) | 23 °C |
| Relative humidity | 86 % |
| Wind speed | 13 km/h |
| Cloud cover | 80 % |
May compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| March | 28.3 °C | 499 mm | 88 % |
| April | 28.3 °C | 463 mm | 88 % |
| May | 28.4 °C | 375 mm | 80 % |
| June | 28.6 °C | 191 mm | 60 % |
| July | 28.9 °C | 121 mm | 49 % |
See all twelve months for Santarém
- May is the 10th warmest month here.
- It is the 8th driest month of the year.
- It ranks 8th for least cloud cover.
- Days last about 12 hours from sunrise to sunset.
- It rains on 30 of 31 days — 95 % of the month.
- Nights are about 3.8 °C cooler than the middle of the day.
- The hottest May day on record since 1991 reached 32 °C, 3.7 °C above the usual daytime high.
QuestionsMay in Santarém, answered
How warm is Santarém in May?
Daily highs average 28 °C and nights fall to about 25 °C, a spread of 3.8 °C between afternoon and dawn. That makes May the 9th warmest month of the year here.
Does it rain much in Santarém in May?
May averages 375 mm of rain, spread over about 30 of the 31 days — 95 % of the month. Cloud cover averages 80 % of the sky.
How long are the days in May?
Santarém averages 12 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.