Temperatures in May
It's cool to moderate in May in Saint Helier with an average temperature of 16°C. Temperatures this month range from a low of 13°C to a high of 19°C. At night, you can expect temperatures between 8°C and 13°C.
Max and Min Temperatures per Day
This chart shows the daily maximum and minimum temperatures in degrees Celsius for Saint Helier in May. The red line indicates the max temperatures, and the blue line shows the minimums.
Start of May
The month of May starts in Saint Helier with cool temperatures, averaging around 16°C during the day and nights close to 10°C. There’s little chance of precipitation. The weather is mostly sunny and dry.
Mid-May
By mid-May, the average daytime temperature stays the same at 16°C, with nights close to 11°C. Not much precipitation expected during this period. It’s mostly dry with sunshine.
End of May
By the end of May, the average daytime temperature in Saint Helier will be around 18°C, with nights close to 12°C. Barely any chance of precipitation. The weather will mostly be dry with lots of sunshine.
Water temperature
The water temperature at Saint Helier is 12°C this month. This is too cold to swim without protective gear.
Precipitation in May
In May, there is an average of 29 mm of precipitation, spread over 6 days. The wind speed is around 4 Bft, mostly coming from the South.
The precipitation chance averages 19% per day this month. Though that seems low, there are also a few days with a higher chance of precipitation.
Precipitation Chance
This chart shows the daily precipitation chance (in percentages) in May for Saint Helier. 0% means it never rained on that day in the past 10 years, and 100% means it rained every day. All values in between represent the average chance of precipitation on that day.
Saint Helier in May |
London | ||
|---|---|---|---|
 Average Temperature |
16°C | 18°C | |
 High Temp |
19°C | 21°C | |
| Low Temp |
13°C | 15°C | |
 Total Precipitation |
29 mm | 46 mm | |
| Rainy Days |
6 days | 8 days | |
April
UV index
The UV index is a maximum of 9 this month. That's a very high value on the intensity scale of 1 to 11. Unprotected skin can burn within 10-15 minutes.
Is May a good time to visit Saint Helier?
Looking for sun and warm weather? Then May isn’t the best time to be in Saint Helier. The temperature is too low this month for a warm stay.
Temperature records for Saint Helier in May
With 28°C, Saint Helier hit the highest temperature in the last 10 years in May 2017. The lowest daytime temperature in this month was 9°C in 2021. The extreme night temperatures ranged from a low of 4°C to a high of 16°C.
Check out the climate of Saint Helier for all months and discover the best travel time
Daily Temperature in May in Saint Helier
This chart shows the average daily temperatures, both day and night, for each day in May in Saint Helier, measured in degrees Celsius. The red line represents the maximum temperatures, while the blue line shows the minimums. The days of the month are displayed at the bottom of the chart. The data, based on historical observations, gives an overview of the average daily temperatures during this month.
Daily Precipitation in May in Saint Helier
The chart below shows the average daily precipitation in May for Saint Helier, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail. The days of the month are shown at the bottom of the chart.
A low average precipitation means that the chance of rain on that day is usually small, while a higher average suggests that rain is more likely. But it’s still an average, so each day can be different. Based on historical weather data for May, you can expect around 6 days of rain in Saint Helier.
Daily UV Index in May in Saint Helier
This chart shows the average daily UV index in May in Saint Helier, with the UV index ranging from 0 to a maximum of 11. The bottom of the chart shows the days of the month. Based on historical data, this chart provides an idea of the daily UV radiation levels you can expect.
Temperature in May in Saint Helier Over the Years
This chart shows the average temperature in May in Saint Helier, measured in degrees Celsius, over the past years.
Total Precipitation in May in Saint Helier Over the Years
This chart shows the average precipitation in May in Saint Helier, measured in millimetres over the past years. Precipitation is always measured as water, even if it’s snow or hail.
Daily climate in May for Saint Helier
Click on a specific day in May for detailed info on the typical weather on that day in Saint Helier. Check out the historical temperatures and precipitation over the past 10 years on this day.
Weather experiences in May in Saint Helier
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Average Weather in Saint Helier by Month
Click on a month below to see detailed weather info for Saint Helier. Based on historical weather data, you can see the average temperature, precipitation, wind, and UV index for each day of the month.
Or check out the climate of Saint Helier for all months at once
