October weather forecastSaint Helier, Jersey
October
Weather in October
In October, the palpable arrival of autumn in Saint Helier brings cooler conditions. The pleasant heat of September gives way to chillier weather, making the mornings crisp and afternoons cool. The rainfall level sees a significant rise, almost doubling from 31mm (1.22") in September to 60mm (2.36") in October. The decrease in sunlight hours further contributes to the autumnal ambiance. The city starts preparing for the colder season, with leaves turning golden and falling to pave the way for winter foliage.Temperature
During October, Saint Helier observes a subtle ascent to a still refreshing 15.5°C (59.9°F) from September's 17.5°C (63.5°F) in the average high-temperature. Saint Helier navigates through October with a barely noticeable decrease in temperature at night, stabilizing at a still refreshing 13.5°C (56.3°F).Humidity
In Saint Helier, the average relative humidity in October is 79%.Rainfall
In Saint Helier, in October, during 17.5 rainfall days, 60mm (2.36") of precipitation is typically accumulated. Throughout the year, in Saint Helier, there are 189 rainfall days, and 538mm (21.18") of precipitation is accumulated.Snowfall
In Saint Helier, snow does not fall in April through October.Sea temperature
In Saint Helier, the average seawater temperature in October is 15°C (59°F).Note: The majority of individuals find it unpleasurable to swim in 15°C (59°F). It becomes progressively harder to manage one's breathing as the water temperature falls below 21°C (69.8°F).
Daylight
In October, the average length of the day in Saint Helier is 10h and 47min.On the first day of the month, sunrise is at 07:08 and sunset at 18:46 BST. On the last day of October, in Saint Helier, Jersey, sunrise is at 06:55 and sunset at 16:48 GMT.
Note: On Sunday, 27. October 2024, at 02:00, Daylight Saving Time ends, and the time zone changes from BST to GMT. Daylight Saving Time starts again on Sunday, 30. March 2025, at 01:00; consequently, the time zone reverts from GMT to BST.
Sunshine
In October, the average sunshine in Saint Helier is 5h.UV index
The average daily maximum UV index in October in Saint Helier, Jersey, is 4. A UV Index value of 3 to 5 symbolizes a moderate health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index, 4 in October, converts into the following recommendations:
Undertake precautions - Guarding against sun damage is counselled. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in October
Saint Helier, Jersey
- Average high temperature in October: 15.5°C
The warmest month (with the highest average high temperature) is August (18.2°C).
The month with the lowest average high temperature is February (9°C).
- Average low temperature in October: 13.5°C
The month with the highest average low temperature is August (16.3°C).
The coldest month (with the lowest average low temperature) is February (6.8°C).
Average pressure in October
Saint Helier, Jersey
- Average pressure in October: 1016mbar
The month with the highest atmospheric pressure is September (1018mbar).
The month with the lowest atmospheric pressure is November (1011.8mbar).
Average wind speed in October
Saint Helier, Jersey
- Average wind speed in October: 27km/h
The windiest month (with the highest average wind speed) is December (34km/h).
The calmest month (with the lowest average wind speed) is July (20.4km/h).
Average humidity in October
Saint Helier, Jersey
- Average humidity in October: 79%
The months with the highest relative humidity are June and July (83%).
The months with the lowest relative humidity are November and December (78%).
Average rainfall in October
Saint Helier, Jersey
- Average rainfall in October: 60mm
The wettest month (with the highest rainfall) is November (78mm).
The driest month (with the least rainfall) is July (25mm).
Average rainfall days in October
Saint Helier, Jersey
- Average rainfall days in October: 17.5 days
The month with the highest number of rainy days is November (21.2 days).
The months with the least rainy days are May and July (12.2 days).
Average snowfall in October
Saint Helier, Jersey
- Average snowfall in October: 0mm
The month with the highest snowfall is January (2mm).
The months with the least snowfall are April, May, June, July, August, September and October (0mm).
Average snowfall days in October
Saint Helier, Jersey
- Average snowfall days in October: 0 days
The months with the highest number of snowfall days are January and February (0.4 days).
The months with the least snowfall days are April, May, June, July, August, September and October (0 days).
Average sea temperature in October
Saint Helier, Jersey
- Average sea temperature in October: 15°C
The best month for swimming (with the highest average sea temperature) is August (17°C).
The coldest months (with the lowest average sea temperature) are February and March (9°C).
Average daylight in October /
Average sunshine in October
Saint Helier, Jersey
- Average daylight in October: 10h and 48min
The month with the longest days is June (Average daylight: 16h and 12min).
The month with the shortest days is December (Average daylight: 8h and 18min).
- Average sunshine in October: 5h and 0min
The month with the most sunshine is July (Average sunshine: 9h and 42min).
The months with the least sunshine are January and November (Average sunshine: 4h and 0min).
Average sunshine days in October
Saint Helier, Jersey
- Average sunshine days in October: 10.9 days
The month with the most sunshine days is May (16.8 days).
The month with the least sunshine days is November (5.8 days).
Average UV index in October
Saint Helier, Jersey
- Average UV index in October: 4
The months with the highest UV index are June, July, August and September (UV index 5).
The months with the lowest UV index are January and February (UV index 2).
Average cloud cover in October
Saint Helier, Jersey
- Average cloud cover in October: 48
The months with the most cloud cover are January, November and December (Cloud cover 61).
The month with the least cloud cover is July (Cloud cover 37).
Average visibility in October
Saint Helier, Jersey
- Average visibility in October: 10km
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (10km).
