Jersey
Jersey in September
Where it is warm, dry and good for swimming in Jersey in September — compared across the country’s main destinations.
Quick answers
- Where is it warmest in Jersey in September?
- St Martin is the warmest of the 6 destinations compared, with highs of 19°C (66°F) in September; Saint Helier is the coolest at 18°C (65°F).
- Can you swim in the sea in Jersey in September?
- Hardly: even the warmest water, at St Martin (18°C (64°F)), stays below 21 °C.
Warmest
19°
St Martin
Coolest
18°
Saint Helier
Driest
68 mm
St Martin
Warmest sea
18°
St Martin
September in Jersey ranges from 18°C (65°F) in Saint Helier to 19°C (66°F) in St Martin — a spread of 0 degrees across the country. On average it is 2 °C (4 °F) cooler than August. Most destinations stay largely dry. Best bets this month: Saint Helier.
Best places in Jersey in September
Weather in September by city
| Place | Day | Night | Rain | Sea | Score |
|---|---|---|---|---|---|
| St Martin | 19° | 13° | 68 mm | 18° | 62 |
| Le Hocq | 19° | 13° | 68 mm | 18° | 62 |
| Saint Helier | 18° | 13° | 69 mm | 18° | 61 |
| Saint John | 18° | 13° | 69 mm | 18° | 61 |
| St Lawrence | 18° | 13° | 69 mm | 18° | 61 |
| Trinity | 18° | 13° | 69 mm | 18° | 61 |
Frequently asked questions
What is the weather like in Jersey in September?
Average daytime highs range from 18° in Saint Helier to 19° in St Martin.
Can you swim in Jersey in September?
The sea is cool: the warmest water is around St Martin at about 18°.