Medan weather in May
In May, Medan has daytime highs averaging 30 °C, nights around 23 °C, with 27 wet days. Figures are 1991–2020 climate normals.
- 30.2°C Average high
- 23.1°C Average low
- 27days Wet days
- 288mm 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 | 30.1 °C | 23.1 °C | 90 % |
| 11–20 May | 30.3 °C | 23.1 °C | 83 % |
| 21–31 May | 30.2 °C | 23.0 °C | 89 % |
- Rain is most likely over days 1–10 of May (90 % of days) and least likely over days 11–20 (83 %).
What to expect
| Measure | Typical May | Share of the month |
|---|---|---|
| Days above 25 °C | 31 of 31 | 100 % |
| Days above 30 °C | 18 of 31 | 57 % |
| Days below 0 °C | 0 of 31 | 0 % |
| Days with more than 1 mm rain | 27 of 31 | 87 % |
Conditions in May
| Measure | Average |
|---|---|
| Mean temperature | 26 °C |
| Record high (1991–2020) | 33 °C |
| Record low (1991–2020) | 21 °C |
| Relative humidity | 88 % |
| Wind speed | 7.9 km/h |
| Cloud cover | 89 % |
May compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| March | 29.9 °C | 203 mm | 81 % |
| April | 30.0 °C | 258 mm | 87 % |
| May | 30.2 °C | 288 mm | 89 % |
| June | 30.2 °C | 218 mm | 83 % |
| July | 30.0 °C | 218 mm | 84 % |
See all twelve months for Medan
- May is the 2nd 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 27 of 31 days — 87 % of the month.
- Nights are about 7.1 °C cooler than the middle of the day.
- The hottest May day on record since 1991 reached 33 °C, 3.2 °C above the usual daytime high.
QuestionsMay in Medan, answered
How warm is Medan in May?
Daily highs average 30 °C and nights fall to about 23 °C, a spread of 7.1 °C between afternoon and dawn. That makes May the 1st warmest month of the year here.
Does it rain much in Medan in May?
May averages 288 mm of rain, spread over about 27 of the 31 days — 87 % of the month. Cloud cover averages 89 % of the sky.
How long are the days in May?
Medan 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.