Saint Helier weather in June
In June, Saint Helier has daytime highs averaging 16 °C, nights around 13 °C, with 9.1 wet days, and a sea temperature of 15 °C. Figures are 1991–2020 climate normals.
- 16.3°C Average high
- 13.4°C Average low
- 9.1days Wet days
- 53mm Rainfall
- 14.5°C Sea temperature
- 16h Daylight
Daily temperatures through June
How June 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 June | 15.6 °C | 12.6 °C | 33 % |
| 11–20 June | 16.1 °C | 13.4 °C | 31 % |
| 21–30 June | 17.2 °C | 14.1 °C | 26 % |
- Average highs rise from 15.6 °C early in June to 17.2 °C by the end of it.
- Rain is most likely over days 1–10 of June (33 % of days) and least likely over days 21–30 (26 %).
What to expect
| Measure | Typical June | Share of the month |
|---|---|---|
| Days above 25 °C | 0.2 of 30 | 1 % |
| Days above 30 °C | 0 of 30 | 0 % |
| Days below 0 °C | 0 of 30 | 0 % |
| Days with more than 1 mm rain | 9.1 of 30 | 30 % |
Conditions in June
| Measure | Average |
|---|---|
| Mean temperature | 15 °C |
| Record high (1991–2020) | 29 °C |
| Record low (1991–2020) | 7.8 °C |
| Relative humidity | 82 % |
| Wind speed | 28 km/h |
| Cloud cover | 57 % |
Where Saint Helier ranks in June
| Ranking | Position | Value |
|---|---|---|
| The coolest places in Europe in June | 19th of 50 | 16 °C |
June compared with the months around it
| Month | Avg high | Rainfall | Cloud |
|---|---|---|---|
| April | 11.4 °C | 57 mm | 59 % |
| May | 13.9 °C | 54 mm | 61 % |
| June | 16.3 °C | 53 mm | 57 % |
| July | 18.1 °C | 49 mm | 54 % |
| August | 18.6 °C | 65 mm | 57 % |
See all twelve months for Saint Helier
- June is the 4th warmest month here.
- It is the 2nd driest month of the year.
- It ranks 3rd for least cloud cover.
- Days last about 16 hours from sunrise to sunset.
- It rains on 9.1 of 30 days — 30 % of the month.
- Nights are about 2.9 °C cooler than the middle of the day.
- The hottest June day on record since 1991 reached 29 °C, 12 °C above the usual daytime high.
- Beach score: 22 / 100 — see how this is calculated.
QuestionsJune in Saint Helier, answered
How warm is Saint Helier in June?
Daily highs average 16 °C and nights fall to about 13 °C, a spread of 2.9 °C between afternoon and dawn. That makes June the 4th warmest month of the year here.
Does it rain much in Saint Helier in June?
June averages 53 mm of rain, spread over about 9 of the 30 days — 30 % of the month. Cloud cover averages 57 % of the sky.
Is the sea warm enough to swim in June?
The sea averages 15 °C off Saint Helier in June. 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 June?
Saint Helier averages 16 hours between sunrise and sunset in June. 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.