Climate Chart of St. Helier, Jersey

Monthly data: Temperature °C, Rain (mm), Sunshine (h) · 2013–2023

Climate overview

Temperature

Monthly mean temperatures range from a low of 7.6 °C in February to a high of 17.6 °C in August. These figures describe monthly averages, not daytime maximum temperatures, so they are a broad guide to the temperature pattern rather than a forecast for an individual visit. The unweighted mean across the calendar-month means is 12.5 °C; it is not a day-weighted annual average.

Rain

Mean daily rainfall is highest in November, at 4.54 mm/day, and lowest in July, at 1.31 mm/day. The figures are daily means, not monthly totals, and the lower average does not guarantee rain-free days or indicate how often rain occurs. The unweighted mean of the monthly daily-rainfall means is 2.57 mm/day, which provides a broad summary without describing the rainfall on any particular day.

Sunshine

Mean daily sunshine reaches its highest level in July at 12.32 hours/day, and its lowest in December at 3.82 hours/day. These are averages of sunshine duration, not measures of day length, and actual conditions can vary. Across the calendar months, the unweighted mean of daily sunshine duration is 8.33 hours/day.

Snow

The highest monthly mean daily snowfall is recorded in March at 0.81 mm/day. The unweighted mean across the monthly daily-snowfall means is 0.14 mm/day; neither figure establishes the number of snowy days, snow depth, snow cover, or skiing conditions.

Best Travel Time Guide for St. Helier, Jersey: Ideal Seasons and Weather Insights

For visitors prioritising lower average rainfall, July is the conditional option indicated by the lowest mean daily rainfall, 1.31 mm/day. It is not a guarantee of dry days, so keep rain-ready layers or an umbrella in your plans; the highest mean daily rainfall occurs in November at 4.54 mm/day, a useful cue to prepare for wetter average conditions rather than a prediction for every day. If cooler monthly mean temperatures are your priority, consider February, when the mean is 7.6 °C; this is an average, not a daytime maximum or a guarantee of the temperature during your visit. For outdoor sightseeing planned around sunshine, July has the highest mean daily sunshine duration at 12.32 hours/day, while December has the lowest at 3.82 hours/day. Sunshine duration does not indicate day length, and these separate criteria do not establish one universally best time to visit.

Climate Data Overview for St. Helier, Jersey

Explore the comprehensive climate data for St. Helier, Jersey. This detailed table provides valuable insights into temperature variations, precipitation levels, and seasonal changes, helping you understand the unique weather patterns of this region.

• See also climate change in St. Helier
• Explore the climate in Jersey