Saint Helier Climate by Month
Saint Helier, St Helier, Jersey
Mild summers and cool winters, with rain spread through the year.
The climate in Saint Helier is one of mild summers and cool winters, with rain spread through the year. Expect highs of 71°F (21°C) in August and 48°F (9°C) in January, with the coldest nights (February) near 40°F (5°C). It gets 34 in (867 mm) of rain a year, spread across the months. The air is humid, averaging 79% relative humidity.
- Warmest month
- 71°F(21°C)
- Average high, August
- Coldest nights
- 40°F(5°C)
- Average low, February
- Rain per year
- 34 in(867 mm)
- No clear rainy season
- Humidity
- 79%
- Sunniest: June
Best and worst months in Saint Helier
Best for weatherJuly and August are the best time for weather in Saint Helier: highs near 70°F (21°C) and about 1.9 in (49 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; December is the coldest, with highs of only 50°F (10°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in July.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Saint Helier weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 48°F(9°C) | 41°F(5°C) | 3.8 in(97 mm) | 80% | 0.9 |
| FebFebruary | 49°F(9°C) | 40°F(5°C) | 2.9 in(73 mm) | 80% | 1.6 |
| MarMarch | 53°F(11°C) | 42°F(6°C) | 2.6 in(65 mm) | 81% | 2.8 |
| AprApril | 56°F(13°C) | 45°F(7°C) | 2.0 in(52 mm) | 80% | 4.3 |
| MayMay | 62°F(17°C) | 50°F(10°C) | 2.0 in(50 mm) | 79% | 5.3 |
| JunJune | 67°F(19°C) | 55°F(13°C) | 2.0 in(51 mm) | 77% | 5.7 |
| JulJulyBest | 70°F(21°C) | 58°F(15°C) | 1.7 in(42 mm) | 78% | 5.6 |
| AugAugustBest | 71°F(21°C) | 59°F(15°C) | 2.2 in(55 mm) | 77% | 4.7 |
| SepSeptember | 67°F(20°C) | 56°F(13°C) | 2.4 in(61 mm) | 80% | 3.5 |
| OctOctober | 61°F(16°C) | 52°F(11°C) | 3.8 in(96 mm) | 77% | 1.9 |
| NovNovember | 55°F(13°C) | 46°F(8°C) | 4.4 in(111 mm) | 80% | 1.1 |
| DecDecember | 50°F(10°C) | 42°F(6°C) | 4.5 in(114 mm) | 84% | 0.7 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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