Grytviken weather in May
In May, Grytviken has daytime highs averaging 0.7 °C, nights around -2.6 °C, with 19 wet days, and a sea temperature of 2.1 °C. Figures are 1991–2020 climate normals.
- 0.7°C Average high
- -2.6°C Average low
- 19days Wet days
- 136mm Rainfall
- 2.1°C Sea temperature
- 8.4h 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 | 1.4 °C | -1.9 °C | 68 % |
| 11–20 May | 0.8 °C | -2.6 °C | 56 % |
| 21–31 May | 0.2 °C | -3.2 °C | 58 % |
- Average highs fall from 1.4 °C early in May to 0.2 °C by the end of it.
- Rain is most likely over days 1–10 of May (68 % of days) and least likely over days 11–20 (56 %).
What to expect
| Measure | Typical May | Share of the month |
|---|---|---|
| Days above 25 °C | 0 of 31 | 0 % |
| Days above 30 °C | 0 of 31 | 0 % |
| Days below 0 °C | 24 of 31 | 79 % |
| Days with more than 1 mm rain | 19 of 31 | 61 % |
Conditions in May
| Measure | Average |
|---|---|
| Mean temperature | -0.8 °C |
| Record high (1991–2020) | 9.2 °C |
| Record low (1991–2020) | -11 °C |
| Relative humidity | 88 % |
| Wind speed | 24 km/h |
| Cloud cover | 83 % |
Where Grytviken ranks in May
| Ranking | Position | Value |
|---|---|---|
| The coolest places in the world in May | 2ndof 50 | 0.7 °C |
May compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| March | 4.3 °C | 154 mm | 84 % |
| April | 2.8 °C | 147 mm | 84 % |
| May | 0.7 °C | 136 mm | 83 % |
| June | -0.5 °C | 128 mm | 84 % |
| July | -1.0 °C | 135 mm | 84 % |
See all twelve months for Grytviken
- May is the 8th warmest month here.
- It is the 8th driest month of the year.
- It ranks 3rd for least cloud cover.
- Days last about 8.4 hours from sunrise to sunset.
- It rains on 19 of 31 days — 61 % of the month.
- Nights are about 3.3 °C cooler than the middle of the day.
- The hottest May day on record since 1991 reached 9.2 °C, 8.5 °C above the usual daytime high.
QuestionsMay in Grytviken, answered
How warm is Grytviken in May?
Daily highs average 0.7 °C and nights fall to about -2.6 °C, a spread of 3.3 °C between afternoon and dawn. That makes May the 8th warmest month of the year here.
Does it rain much in Grytviken in May?
May averages 136 mm of rain, spread over about 19 of the 31 days — 61 % of the month. Cloud cover averages 83 % of the sky.
Is the sea warm enough to swim in May?
The sea averages 2.1 °C off Grytviken in May. Most people find water below 20 °C bracing and above 25 °C comfortable for a long swim; this figure is a monthly surface average, so a sheltered bay on a still afternoon can be warmer.
How long are the days in May?
Grytviken averages 8.4 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.