Climate averages 1991–2020
Saint Helier weather
in July.
A mild, moderately wet month: the 2nd warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a mild month in Saint Helier: daytime highs average 17.9°C and nights cool to about 15.4°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 48 mm of rain on roughly 9 days, which makes July a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 15 h 47 min on an average July day.
The nearest other city in this atlas is Rennes (124 km away). In July its highs average 23.1°C, 5.2°C warmer than Saint Helier, with 46 mm of rain.
From July to August, average highs rise by 0.6°C to 18.5°C, and monthly rainfall rises from 48 mm to 63 mm.
The annual picture
July in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Saint Helier climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 9.1°C6.8°C | 6.8°C | 110 | 15.8 | 8.79 h |
| February | 8.7°C6.3°C | 6.3°C | 82 | 13.0 | 10.110 h |
| March | 9.7°C7.3°C | 7.3°C | 69 | 12.4 | 11.912 h |
| April | 11.3°C8.6°C | 8.6°C | 57 | 10.5 | 13.714 h |
| May | 13.7°C11.0°C | 11.0°C | 53 | 9.4 | 15.315 h |
| June | 16.1°C13.4°C | 13.4°C | 50 | 8.7 | 16.216 h |
| July, selected | 17.9°C15.4°C | 15.4°C | 48 | 9.1 | 15.816 h |
| August | 18.5°C16.1°C | 16.1°C | 63 | 9.8 | 14.414 h |
| September | 17.5°C15.1°C | 15.1°C | 77 | 11.0 | 12.713 h |
| October | 15.2°C12.9°C | 12.9°C | 122 | 15.5 | 10.811 h |
| November | 12.2°C10.0°C | 10.0°C | 132 | 17.6 | 9.29 h |
| December | 10.0°C7.7°C | 7.7°C | 138 | 16.7 | 8.38 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
July in nearby cities
- Rennes in JulyFrance · 124 kmHigh 23.1°C · Low 14.2°C · 46 mm rain
- Caen in JulyFrance · 127 kmHigh 22.5°C · Low 14.3°C · 55 mm rain
- Le Havre in JulyFrance · 164 kmHigh 20.8°C · Low 14.9°C · 61 mm rain
- Poole in JulyUnited Kingdom · 170 kmHigh 20.1°C · Low 14.4°C · 47 mm rain
- Bournemouth in JulyUnited Kingdom · 171 kmHigh 20.1°C · Low 14.3°C · 47 mm rain
- Portsmouth in JulyUnited Kingdom · 193 kmHigh 20.8°C · Low 14.0°C · 52 mm rain
- Brest, France in JulyFrance · 196 kmHigh 18.9°C · Low 14.6°C · 45 mm rain
- Plymouth in JulyUnited Kingdom · 197 kmHigh 19.4°C · Low 13.9°C · 61 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Saint Helier) is explained once on the Saint Helier year overview and on the Sources, method and limits page.