September
Weather in St Helier for September 2026
Your guide to St Helier weather in September - trends and predictions
Until now, September 2026 in St Helier has been nearly identical to the historical average, with a temperature of 18.5 °C (showing only a slight deviation of 0.2 °C).
The forecast for the next days in St Helier predicts temperatures to be around 18 °C, close to the historical average.
In general, the average temperature in St Helier at the beginning of September is 19.4 °C. As the month progressed, temperatures tended to moderately fall, reaching an average of 17.4 °C by the end of September.
The climate of St Helier in September is notably wet, with an average of 15 rainy days, and a total of 91.7 mm of precipitation.
Temperatures
Rain 🌧️
15
Dry days
15
Rainy days
0
Snow days
18°/16°
Temperatures
34 km/h
Avg max wind
76 %
Avg humidity
St Helier Weather September
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Temperatures trend during September in St Helier
See the weather trend as well as the moving average line
September weather in St Helier day by day
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| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. |  Light rain shower | 18° /16° | 8.2 mm | 3 | |
| 2 Sept. |  Partly cloudy | 19° /16° | 4 mm | 4 | |
| 3 Sept. | Light rain shower | 20° /17° | 1.4 mm | 4 | |
| 4 Sept. |  Sunny | 19° /17° | 0.9 mm | 4 | |
| 5 Sept. | Sunny | 19° /16° | 1.3 mm | 4 | |
| 6 Sept. |  Overcast | 21° /17° | 0.3 mm | 4 | |
| 7 Sept. | Light rain shower | 20° /17° | 3 mm | 4 | |
| 8 Sept. | Patchy rain possible | 18° /16° | 5.9 mm | 4 | |
| 9 Sept. | Patchy rain possible | 19° /16° | 1.6 mm | 4 | |
| 10 Sept. |  Patchy light rain with thunder | 18° /16° | 4.9 mm | 4 | |
| 11 Sept. | Light rain shower | 18° /16° | 1.8 mm | 4 | |
| 12 Sept. | Partly cloudy | 17° /15° | 2.5 mm | 4 | |
| 13 Sept. | Patchy rain possible | 17° /15° | 0.7 mm | 3 | |
| 14 Sept. | Sunny | 18° /16° | 0.3 mm | 5 | |
| 15 Sept. | Sunny | 19° /15° | 0.4 mm | 5 | |
| 16 Sept. | Patchy rain possible | 18° /16° | 1 mm | 4 | |
| 17 Sept. | Patchy rain possible | 17° /16° | 1.7 mm | 4 | |
| 18 Sept. | Patchy rain possible | 17° /16° | 0.5 mm | 4 | |
| 19 Sept. | Patchy rain possible | 18° /17° | 0.3 mm | 5 | |
| 20 Sept. | Overcast | 18° /18° | 0.3 mm | 5 | |
| 21 Sept. | Sunny | 20° /17° | 0 mm | 5 | |
| 22 Sept. | Sunny | 20° /17° | 0 mm | 5 | |
| 23 Sept. | Overcast | 20° /17° | 0 mm | 6 | |
| 24 Sept. | Overcast | 21° /17° | 0 mm | 5 | |
| 25 Sept. | Sunny | 18° /16° | 0 mm | 5 | |
| 26 Sept. | Sunny | 18° /15° | 0 mm | 5 | |
| 27 Sept. | Overcast | 16° /13° | 0 mm | 4 | |
| 28 Sept. | Overcast | 16° /15° | 0 mm | 4 | |
| 29 Sept. | Overcast | 16° /14° | 0 mm | 5 | |
| 30 Sept. | Sunny | 17° /14° | 1.3 mm | 5 | |
| Next | |||||
Important Notice
Our weather forecast for St 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 St Helier forecast closer to your planned date for the most up-to-date weather information.
Change Month
St Helier in September - FAQ
What are the expected maximum and minimum temperatures in St 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 St Helier during September?
Moderate rainfall is anticipated in St Helier during September, with a total of 91.7 mm spread over approximately 15 days. Considering plans for rainy days is advisable.
What are the typical wind conditions in St Helier during September?
The average wind speed in St Helier during September is 34 km/h, suggesting breezy to windy conditions, depending on your activities.
September rainfall patterns in St Helier
Explore the daily rainfall trends and prepare for St Heliers September weather 💧
Typically, St Helier has 15 rainy days in September with a total of 91.7 mm of rainfall.
UV exposure in St Helier during September
Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️
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