How many sunny days does Saint Helier have per year?

Saint Helier averages approximately 163 sunny days per year, based on historical climate data.

What is the air quality in Saint Helier?

Saint Helier has an annual PM2.5 concentration of 6.8 µg/m³, classified as "Good" by WHO standards. Within WHO interim target 4. Low health risk for most people.

St Helier

Saint Helier · Jersey

Name: Saint Helier, Jersey
Address: Saint Helier, JE

The capital and largest city of Jersey.

Small city

58K

24 km²

11m

05:01 UTC+0

GBP

Explore on map →Climate twin →

Saint Helier, Jersey is a 58K-resident city with 163 sunny days and 0 frost days annually and an annual PM2.5 of 6.8 µg/m³. The capital and largest city of Jersey.

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Climate

Feels-like °C

-5

-4

-3

Dinner outside

Climate Lab·Saint Helier

Monthly climate metrics across temperature, precipitation, wind, and UV.

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Metric	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Year
Temperature
Daily high°C	11	11	11	13	15	18	20	20	20	17	14	12	15
Daily mean°C	9	9	10	11	13	15	17	18	17	15	13	10	13
Daily low°C	6	8	7	9	11	14	15	16	15	14	9	7	11
Thermal comfort
High feelsDaily high feels-like°C	4	6	11	15	20	24	26	25	22	17	11	4	15
Mean feelsDaily mean feels-like°C	-5	-4	0	5	12	15	17	17	14	9	3	-3	7
Low feelsDaily low feels-like°C	-11	-12	-8	-5	0	7	9	9	5	1	-7	-11	-2
Humidity
HumidityRelative humidity%	82	82	81	79	81	82	83	83	81	82	81	82	81
Dewpoint°C	4.6	6.4	6.6	7.5	10.4	12.6	14.3	15.1	13.6	11.9	9.4	6.3	9.9
Precipitation
Rainfallmm	109	73	97	54	34	62	45	51	83	138	79	181	1005
Rain days≥1mm	17	13	15	7	11	13	13	10	11	17	16	20	163
Wind
Wind avgm/s	7.7	8.7	6.7	6.2	5.5	5.3	5.5	5.8	5.1	7.3	6.3	8.3	6.5
Wind gustsm/s	14.1	14.3	13.4	12.1	9.6	10.1	10.2	10.7	11.9	13.0	13.7	14.2	12.3
Sun & UV
Sunshinehrs/day	4.0	5.6	8.0	10.7	11.4	11.7	11.5	10.2	8.7	6.6	4.9	3.0	8.0
Clear skyindex	24%	28%	44%	43%	40%	43%	51%	44%	37%	36%	32%	20%	37%
UV indexmax avg	0.6	1.1	2.2	3.8	5.4	6.0	5.7	5.3	3.7	2.0	0.9	0.5	3.1

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Lifestyle Calendar·Saint Helier

Outdoor living in Saint Helier is seasonal. October through March are the toughest stretch. Even dinner outside manages 1/12 months, while walking works 6/12 months.

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Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Annual

1/12

Dinner Outside

23Jan: 23% viability

23Feb: 23% viability

26Mar: 26% viability

38Apr: 38% viability

57May: 57% viability

65Jun: 65% viability

63Jul: 63% viability

63Aug: 63% viability

57Sep: 57% viability

39Oct: 39% viability

26Nov: 26% viability

24Dec: 24% viability

1/12

Dinner Outside

23Jan: 23% viability

23Feb: 23% viability

26Mar: 26% viability

38Apr: 38% viability

57May: 57% viability

65Jun: 65% viability

63Jul: 63% viability

63Aug: 63% viability

57Sep: 57% viability

39Oct: 39% viability

26Nov: 26% viability

24Dec: 24% viability

42%

Cold

0/12

Lunch Outside

22Jan: 22% viability

23Feb: 23% viability

34Mar: 34% viability

47Apr: 47% viability

48May: 48% viability

51Jun: 51% viability

53Jul: 53% viability

52Aug: 52% viability

45Sep: 45% viability

29Oct: 29% viability

27Nov: 27% viability

21Dec: 21% viability

0/12

Lunch Outside

22Jan: 22% viability

23Feb: 23% viability

34Mar: 34% viability

47Apr: 47% viability

48May: 48% viability

51Jun: 51% viability

53Jul: 53% viability

52Aug: 52% viability

45Sep: 45% viability

29Oct: 29% viability

27Nov: 27% viability

21Dec: 21% viability

38%

Wind

6/12

Walking

53Jan: 53% viability

42Feb: 42% viability

60Mar: 60% viability

71Apr: 71% viability

76May: 76% viability

83Jun: 83% viability

83Jul: 83% viability

79Aug: 79% viability

70Sep: 70% viability

57Oct: 57% viability

51Nov: 51% viability

46Dec: 46% viability

6/12

Walking

53Jan: 53% viability

42Feb: 42% viability

60Mar: 60% viability

71Apr: 71% viability

76May: 76% viability

83Jun: 83% viability

83Jul: 83% viability

79Aug: 79% viability

70Sep: 70% viability

57Oct: 57% viability

51Nov: 51% viability

46Dec: 46% viability

64%

Rain

6/12

Running

53Jan: 53% viability

42Feb: 42% viability

60Mar: 60% viability

71Apr: 71% viability

76May: 76% viability

83Jun: 83% viability

83Jul: 83% viability

79Aug: 79% viability

70Sep: 70% viability

57Oct: 57% viability

51Nov: 51% viability

46Dec: 46% viability

6/12

Running

53Jan: 53% viability

42Feb: 42% viability

60Mar: 60% viability

71Apr: 71% viability

76May: 76% viability

83Jun: 83% viability

83Jul: 83% viability

79Aug: 79% viability

70Sep: 70% viability

57Oct: 57% viability

51Nov: 51% viability

46Dec: 46% viability

64%

Rain

Tap any month for details · Click activity name for overview

ComfortableModerateUncomfortable

Based on 2014–2024 hourly climate data · Updated Mar 2025

Confidence: High

Saint Helier · Jersey

Climate

Climate Lab·Saint Helier

Lifestyle Calendar·Saint Helier

Air Quality Profile

Air Quality Profile

Who thrives in Saint Helier

Frequently asked about Saint Helier