Jersey in September has mild conditions, with highs averaging 18.2°C (65°F) and noticeably cooler mornings. Rain falls on about 12 days this month. Winds are noticeable.
This month falls at the beginning of Autumn.
Temperature
18°C / 16°C
Jersey Weather in September 2026
Monthly climate averages for Saint Helier. Based on 10-year ERA5 reanalysis data.
Cfb Oceanic
Climate Overview
Compared to August, this month is about 1°C cooler with 3 more rainy days. Temperatures begin dropping heading into October.
Monthly September Averages
Feels Like
17°C / 13°C
Rain
12 days · 101 mm
Sunshine
10.1h / day
Humidity
80% — Very Humid
Wind
31 km/h
Wind Direction
NW (304°)
Gusts
42 km/h
Daylight
12.6 h
Cloud Cover
60%
Clear Sky Days
2.5
Dew Point
14°C — Comfortable
Moon Phase
Waxing Crescent · 11%
Seasonal Demand
Moderate (3/5)
Sun Position
Sunrise 06:46
Daylight 12.6h
Sunset 19:25
What to Expect
Keep afternoons flexible as tropical showers are common — they typically clear within an hour.
Wet weather can spread across much of the day, so it is best to keep outdoor plans flexible.
Weather conditions this month are among the best of the year, making it a popular time for outdoor activities.
Pros
- Comfortable temperatures for sightseeing
- Abundant sunshine for exploring and outdoor fun
Cons
- Popular month due to favourable weather conditions
What to Wear
Dress in layers — a mix of long sleeves, light sweaters, and a versatile jacket works best for changeable conditions. A waterproof jacket and shoes are non-negotiable — showers are frequent.
Packing List
UmbrellaWaterproof jacketComfortable walking shoes
Compare Months
January
Wet 
February
Poor 
March
Poor April
Fair May
Fair June best
Good July best
Excellent August best
Excellent September best
Good October
Fair November
Wet December
Wet | Month | Temp | Feels Like | Rain | Sun | Humidity | Status | Details |
|---|---|---|---|---|---|---|---|
| January | 9°C / 7°C | 5°C / 1°C | 18days (131 mm) Wet | 4.7h Fair | 80% Humid | Wet | View Details |
| February | 9°C / 8°C | 5°C / 1°C | 14days (88 mm) Wet | 5.9h Fair | 82% Humid | Poor | View Details |
| March | 10°C / 8°C | 6°C / 2°C | 13days (67 mm) Wet | 8.7h Good | 80% Humid | Poor | View Details |
| April | 12°C / 9°C | 9°C / 4°C | 8days (44 mm) Wet | 11.3h Excellent | 78% Humid | Fair | View Details |
| May | 14°C / 12°C | 12°C / 8°C | 10days (49 mm) Wet | 12.6h Excellent | 82% Humid | Fair | View Details |
| June best | 17°C / 15°C | 16°C / 12°C | 10days (61 mm) Wet | 13h Excellent | 83% Humid | Good | View Details |
| July best | 18°C / 17°C | 18°C / 14°C | 11days (55 mm) Wet | 12.7h Excellent | 83% Humid | Excellent | View Details |
| August best | 19°C / 17°C | 19°C / 15°C | 9days (57 mm) Wet | 11.6h Excellent | 82% Humid | Excellent | View Details |
| September best | 18°C / 16°C | 17°C / 13°C | 12days (101 mm) Wet | 10.1h Excellent | 80% Humid | Good | View Details |
| October | 16°C / 14°C | 13°C / 10°C | 17days (151 mm) Wet | 7.6h Good | 80% Humid | Fair | View Details |
| November | 13°C / 11°C | 9°C / 6°C | 18days (149 mm) Wet | 5.7h Fair | 79% Humid | Wet | View Details |
| December | 10°C / 9°C | 6°C / 2°C | 18days (153 mm) Wet | 4.3h Fair | 82% Humid | Wet | View Details |
Frequently Asked Questions
September is typically good for visiting Jersey, with average highs of 18°C (65°F) and around 12 rainy days. Jersey in September has mild conditions, with highs averaging 18.2°C (65°F) and noticeably cooler mornings. Rain falls o
Jersey typically sees around 12 rainy days in September with 101 mm (4 in) of total rainfall. Pack a waterproof jacket.
With highs of 18°C (65°F) and lows of 16°C (61°F) in September, we recommend: Umbrella, Waterproof jacket, Comfortable walking shoes. Comfortable walking shoes are essential.
Yes, September offers some of the best weather conditions in Jersey with comfortable temperatures and lower chances of rain.
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