Weather in Saint Helier for September 2025
In general, the average temperature in Saint Helier at the beginning of September is 19.6 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 17.3 °C by the end of September.
Saint Helier in September brings notable rainfall, with an average of 19 rainy days and a total precipitation of 92.1 mm.
Is September a good time to visit Saint Helier? check out the best time to travel to Saint Helier page.
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Saint Helier in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  18° | 2  19° | 3 20° | 4  20° | 5 20° | 6 20° | 7 20° |
| 8 19° | 9 20° | 10  19° | 11  18° | 12 17° | 13  17° | 14 17° |
| 15 19° | 16 19° | 17 19° | 18 19° | 19 19° | 20  19° | 21 17° |
| 22  17° | 23 16° | 24 17° | 25 17° | 26 17° | 27 17° | 28 17° |
| 29 18° | 30 18° |
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Temperatures trend during September in Saint Helier
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Light rain shower | 18° /17° | 14.5 mm | 4 | |
| 2 Sept. | Partly cloudy | 19° /16° | 1.2 mm | 5 | |
| 3 Sept. | Partly cloudy | 20° /17° | 0.7 mm | 5 | |
| 4 Sept. | Sunny | 20° /17° | 0.7 mm | 5 | |
| 5 Sept. | Sunny | 20° /17° | 2.6 mm | 5 | |
| 6 Sept. | Partly cloudy | 20° /17° | 0 mm | 5 | |
| 7 Sept. | Sunny | 20° /17° | 5.1 mm | 5 | |
| 8 Sept. | Partly cloudy | 19° /17° | 6 mm | 5 | |
| 9 Sept. | Patchy rain possible | 20° /17° | 0.7 mm | 5 | |
| 10 Sept. | Patchy light rain with thunder | 19° /17° | 7.8 mm | 5 | |
| 11 Sept. | Cloudy | 18° /16° | 1.1 mm | 4 | |
| 12 Sept. | Partly cloudy | 17° /15° | 1.3 mm | 4 | |
| 13 Sept. | Overcast | 17° /15° | 0.2 mm | 4 | |
| 14 Sept. | Sunny | 17° /15° | 0 mm | 5 | |
| 15 Sept. | Sunny | 19° /15° | 0 mm | 6 | |
| 16 Sept. | Patchy rain possible | 19° /17° | 0.7 mm | 5 | |
| 17 Sept. | Light rain shower | 19° /17° | 2.9 mm | 5 | |
| 18 Sept. | Light rain shower | 19° /17° | 0.9 mm | 5 | |
| 19 Sept. | Patchy rain possible | 19° /17° | 0.2 mm | 5 | |
| 20 Sept. | Moderate or heavy rain shower | 19° /16° | 10.5 mm | 4 | |
| 21 Sept. | Light rain shower | 17° /15° | 5.1 mm | 4 | |
| 22 Sept. | Patchy light drizzle | 17° /15° | 3.2 mm | 4 | |
| 23 Sept. | Patchy rain possible | 16° /14° | 7.4 mm | 4 | |
| 24 Sept. | Partly cloudy | 17° /15° | 2.3 mm | 5 | |
| 25 Sept. | Overcast | 17° /15° | 4.4 mm | 4 | |
| 26 Sept. | Patchy light drizzle | 17° /15° | 3.7 mm | 4 | |
| 27 Sept. | Patchy rain possible | 17° /14° | 5.1 mm | 4 | |
| 28 Sept. | Patchy rain possible | 17° /14° | 0.7 mm | 4 | |
| 29 Sept. | Patchy rain possible | 18° /14° | 1.1 mm | 4 | |
| 30 Sept. | Sunny | 18° /15° | 1.9 mm | 5 | |
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Saint Helier in September - FAQ
What to pack to Saint Helier in September?
As you prepare for your trip to Saint Helier in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Saint Helier, during September, is comfortable and enjoyable, regardless of the weather conditions.
- Clothing
- Layered Clothing: Light sweaters, long-sleeve shirts, light jackets, and comfortable pants
- Rain Gear: Lightweight, waterproof clothing
- Footwear
- Waterproof Shoes
- Accessories
- Umbrellas/Raincoats: For rainy days
September rainfall patterns in Saint Helier
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Where is Saint Helier?Get accurate weather forecasts for Saint Helier, located at latitude 49.188 and longitude -2.105. Stay updated with localized weather information tailored for Saint Helier.