September
Weather in Saint Helier for September 2026
Your guide to Saint Helier weather in September - trends and predictions
In general, the average temperature in Saint Helier at the beginning of September is 19.3 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 16.9 °C by the end of September.
Saint Helier experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 91.7 mm.
Temperatures
Rain 🌧️
7
Dry days
23
Rainy days
0
Snow days
18°/16°
Temperatures
34 km/h
Avg max wind
76 %
Avg humidity
Saint Helier Weather September
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Temperatures trend during September in Saint Helier
See the weather trend as well as the moving average line
September weather in Saint Helier day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 18° /17° | 10.9 mm | 4 | |
| 2 Sept. |  Partly cloudy | 19° /16° | 5.3 mm | 4 | |
| 3 Sept. | Light rain shower | 20° /17° | 1.6 mm | 5 | |
| 4 Sept. |  Sunny | 19° /17° | 1.2 mm | 5 | |
| 5 Sept. | Sunny | 19° /16° | 1.7 mm | 5 | |
| 6 Sept. | Partly cloudy | 20° /17° | 0 mm | 5 | |
| 7 Sept. | Light rain shower | 20° /17° | 3.9 mm | 5 | |
| 8 Sept. | Partly cloudy | 18° /16° | 4 mm | 5 | |
| 9 Sept. | Patchy rain possible | 20° /16° | 2 mm | 4 | |
| 10 Sept. |  Patchy light rain with thunder | 18° /16° | 6.5 mm | 4 | |
| 11 Sept. | Light rain shower | 17° /15° | 2.1 mm | 4 | |
| 12 Sept. | Partly cloudy | 17° /15° | 3.4 mm | 4 | |
| 13 Sept. |  Overcast | 17° /15° | 1 mm | 4 | |
| 14 Sept. | Sunny | 18° /15° | 0.4 mm | 5 | |
| 15 Sept. | Sunny | 19° /15° | 0.4 mm | 5 | |
| 16 Sept. | Patchy rain possible | 18° /16° | 1 mm | 4 | |
| 17 Sept. | Light rain shower | 19° /16° | 2 mm | 5 | |
| 18 Sept. | Light rain shower | 19° /17° | 0.6 mm | 4 | |
| 19 Sept. | Patchy rain possible | 20° /17° | 0.1 mm | 5 | |
| 20 Sept. |  Moderate or heavy rain shower | 19° /15° | 9.2 mm | 4 | |
| 21 Sept. | Light rain shower | 16° /14° | 10.4 mm | 4 | |
| 22 Sept. | Light rain shower | 16° /14° | 5.7 mm | 4 | |
| 23 Sept. | Patchy rain possible | 16° /14° | 5.1 mm | 4 | |
| 24 Sept. | Light rain shower | 17° /14° | 1.7 mm | 4 | |
| 25 Sept. | Overcast | 17° /15° | 2.9 mm | 4 | |
| 26 Sept. | Light rain shower | 16° /14° | 2.6 mm | 4 | |
| 27 Sept. | Patchy rain possible | 17° /13° | 3.4 mm | 4 | |
| 28 Sept. | Patchy rain possible | 17° /14° | 0.5 mm | 4 | |
| 29 Sept. | Patchy rain possible | 17° /14° | 0.8 mm | 4 | |
| 30 Sept. | Sunny | 17° /14° | 1.3 mm | 5 | |
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Important Notice
Our weather forecast for Saint Helier in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Saint Helier forecast closer to your planned date for the most up-to-date weather information.
Change Month
Saint Helier in September - FAQ
What are the expected maximum and minimum temperatures in Saint Helier during September?
During September, expect a variety of temperatures with highs around 18° and lows near 16°, suitable for diverse activities and preferences.
How much rainfall should be expected in Saint Helier during September?
Moderate rainfall is anticipated in Saint Helier during September, with a total of 91.7 mm spread over approximately 23 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in Saint Helier during September?
The average wind speed in Saint Helier during September is 34 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in Saint Helier
Explore the daily rainfall trends and prepare for Saint Heliers September weather 💧
Typically, Saint Helier has 23 rainy days in September with a total of 91.7 mm of rainfall.
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