Saint Helier is at its most pleasant from mid June to mid September. For walking, go from mid April to October. It is rarely warm enough for sunbathing.
When to go five ratings · thirty-six ten-day sections · click a cell to read it
Sun is not what Saint Helier is for: the Sunbathing rating tops out at 8, mostly because it is too cool. The clearest skies come in April, when the sky is typically 61% covered at midday (often cloudy).
For being outside, go from mid June to mid September. It peaks in mid July, at 80. Avoid November to early April for this: it falls to 0, mostly because it is too cold.
The walking season here runs from mid April to October. It peaks in early June, at 87. The weakest stretch is in early and mid January, when it drops to 11, mostly because it is too cold.
The year, measured
The average temperature in Saint Helier over the whole year is 12°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 7°C. The rainy (wet) season in Saint Helier runs from October to March, peaking in December with a 28% chance of rain on a given day. The dry season is April to September; July is the driest month, at 9%. Winds in Saint Helier are highest in December, averaging 6.5 m/s (23 km/h), and lightest in June, at 4.3 m/s (15 km/h). The prevailing wind is from the SW. The clearest skies in Saint Helier come in April, when the sky is typically 60% covered; December is the cloudiest month, at 77%.
Month by month Saint Helier climate by month: average temperatures year round · click a month to read it
| Month | High | Low | Feels like | Chance of rain | Cloud | Wind | Being outside | Sun | Walking |
|---|---|---|---|---|---|---|---|---|---|
| January | 8°C | 7°C | 2°C | 24% | 76% | 6.0 m/s | 0 | 0 | 15 |
| February | 9°C | 7°C | 3°C | 21% | 72% | 6.2 m/s | 0 | 0 | 21 |
| March | 10°C | 7°C | 4°C | 19% | 70% | 5.8 m/s | 1 | 0 | 33 |
| April | 12°C | 9°C | 7°C | 13% | 60% | 4.8 m/s | 7 | 0 | 55 |
| May | 15°C | 11°C | 11°C | 11% | 61% | 4.6 m/s | 21 | 0 | 80 |
| June | 18°C | 14°C | 15°C | 13% | 65% | 4.3 m/s | 52 | 3 | 84 |
| July | 20°C | 16°C | 17°C | 9% | 62% | 4.4 m/s | 75 | 5 | 84 |
| August | 20°C | 16°C | 17°C | 12% | 63% | 4.4 m/s | 75 | 5 | 81 |
| September | 18°C | 15°C | 15°C | 14% | 67% | 4.8 m/s | 56 | 3 | 81 |
| October | 15°C | 13°C | 11°C | 26% | 69% | 5.4 m/s | 21 | 0 | 76 |
| November | 12°C | 10°C | 6°C | 27% | 74% | 6.1 m/s | 1 | 0 | 45 |
| December | 9°C | 8°C | 4°C | 28% | 77% | 6.5 m/s | 0 | 0 | 26 |
High and low are the warmest and coolest of four readings a day — midnight, 6am, noon and 6pm — so a true overnight low can sit a degree or two under them. Chance of rain, cloud and wind are the day’s average; feels-like and the three ratings (each out of 100: Good from 55, Ideal from 80) are read at midday.
Seasons, and the year in short Saint Helier weather by season
Year round, Saint Helier has days of about 8°C at their warmest in January, its coolest month, and 20°C in July, its warmest; the coolest hours of the day run from 7°C to 16°C through the year, and the average temperature over the year is 12°C around the clock. Rain is most likely around December and least likely around July. Every figure here is a decade of observations blended into one representative year, so it reads as what this date is usually like, not a forecast for one particular day.
Saint Helier weather in winterDecember to February
Winter in Saint Helier has typical daily highs of about 9°C and lows of about 7°C, with a 24% chance of rain on a given day.
Saint Helier weather in springMarch to May
Spring in Saint Helier has typical daily highs of about 12°C and lows of about 9°C, with a 14% chance of rain on a given day.
Saint Helier weather in summerJune to August
Summer in Saint Helier has typical daily highs of about 19°C and lows of about 15°C, with a 11% chance of rain on a given day.
Saint Helier weather in autumnSeptember to November
Autumn in Saint Helier has typical daily highs of about 15°C and lows of about 12°C, with a 22% chance of rain on a given day.
When is the rainy season in Saint Helier?
The rainy (wet) season in Saint Helier runs from October to March, peaking in December with a 28% chance of rain on a given day. The dry season is April to September; July is the driest month, at 9%.
What time of year is Saint Helier windiest?
Winds in Saint Helier are highest in December, averaging 6.5 m/s (23 km/h), and lightest in June, at 4.3 m/s (15 km/h). The prevailing wind is from the SW.
What is the average temperature in Saint Helier year round?
The average temperature in Saint Helier over the whole year is 12°C. July is the hottest month, with highs of about 20°C; January is the coldest, with lows of about 7°C.
Where to go instead in early January, the weakest time here for being outside
How this is worked out
Every figure is a decade of weather-station observations blended into one typical year, in ten-day sections. The ratings, the chart and the feels-like column are read at midday local solar time. Being outside is the Easy outdoors rating, Sun is Sunbathing and Walking is Active outdoors, each out of 100: Good from 55, Ideal from 80. They describe what a time of year is usually like here, not a forecast. The dotted links open the map at that time of year; set its time of day to midday to see these numbers.