Average temperature in July is 16.4 °C
Average daytime temperature is 17.1 °C
Average night temperature is 15.8 °C
Absolute maximum temperature: 20 °C
Absolute minimum temperature: 14.5 °C
Number of sunny days: 11
Number of rainy days: 20
Number of snow days:
Precipitation sum: 55 mm
* Weather data for St Martin Guernsey is based on climate observations for 2023 year
| July (°C) | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Maximum temperature | 16.9 | 16.2 | 16.4 | 15.7 | 15.7 | 16.3 | 20 | 19.2 | 16.8 | 18.3 | 17.8 | 16.3 | 16.5 | 18.9 | 16.9 | 16.6 | 16.3 | 16.8 | 16.6 | 16.4 | 16.5 | 17.5 | 17.2 | 16.7 | 16.5 | 17.4 | 17.6 | 17.7 | 17.1 | 17.6 | 17.8 |
| Apparent max temperature | 14.2 | 14.6 | 13.5 | 15.8 | 14 | 17.9 | 19.1 | 18.8 | 17.8 | 16.8 | 15.3 | 14 | 16.2 | 15.6 | 13.2 | 12.9 | 15.9 | 18.3 | 15.5 | 16.5 | 16.1 | 13.5 | 16.1 | 17 | 15.7 | 16.1 | 16 | 17.2 | 15.9 | 13.7 | 16.2 |
| Mean temperature | 16.6 | 15.9 | 15.9 | 15.3 | 15.5 | 15.5 | 17.7 | 17 | 16.3 | 17 | 16.7 | 16.1 | 16.1 | 17.2 | 16.5 | 16 | 16 | 16 | 16.3 | 15.9 | 16 | 16.5 | 16.8 | 16.4 | 15.8 | 16.7 | 17.4 | 17 | 16.7 | 17 | 17.3 |
| Apparent mean temperature | 12 | 12.4 | 11.7 | 7.9 | 10 | 13.4 | 14.7 | 15.5 | 12.9 | 13.6 | 12.7 | 12 | 12.7 | 12 | 8.5 | 10.3 | 11.9 | 14.3 | 13.6 | 13.9 | 12.6 | 11.3 | 12.3 | 12.1 | 11.8 | 13 | 12.4 | 14.8 | 12.4 | 11.5 | 12.7 |
| Minimum temperature | 16.3 | 15.7 | 15.6 | 14.5 | 15.3 | 14.8 | 15.7 | 16.1 | 15.5 | 16 | 16.1 | 15.6 | 15.7 | 16.4 | 16 | 15.3 | 15.7 | 15.6 | 16.1 | 15.3 | 15.3 | 15.4 | 16.6 | 16 | 15.1 | 16.1 | 17.1 | 16.6 | 16.5 | 16.1 | 16.7 |
| Apparent min temperature | 13 | 13.4 | 12.6 | 12.9 | 12.2 | 15.4 | 16.7 | 16.7 | 15.8 | 15.1 | 14.2 | 12.9 | 14.2 | 13.6 | 11.2 | 12.1 | 13.8 | 15.7 | 14.5 | 14.7 | 13.8 | 12.3 | 14.7 | 14.7 | 13.5 | 14.7 | 14.1 | 15.9 | 14.1 | 12.7 | 14 |
| July | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Daylight duration (h) | 16.2 | 16.2 | 16.2 | 16.2 | 16.1 | 16.1 | 16.1 | 16.1 | 16 | 16 | 16 | 16 | 15.9 | 15.9 | 15.9 | 15.8 | 15.8 | 15.8 | 15.7 | 15.7 | 15.7 | 15.6 | 15.6 | 15.5 | 15.5 | 15.4 | 15.4 | 15.4 | 15.3 | 15.3 | 15.2 |
| Sunshine duration (h) | 13.7 | 13 | 14.6 | 10.3 | 14.7 | 14.7 | 14.7 | 11 | 9 | 13.8 | 6.6 | 14.3 | 14.3 | 4.7 | 13.9 | 11.9 | 14.6 | 13.8 | 14.5 | 14.1 | 14.4 | 2.7 | 5 | 13.9 | 13.4 | 8.7 | 0 | 9.6 | 11.2 | 10.9 | 0 |
| Precipitation (mm) | 0.2 | 0 | 0 | 4.7 | 0.1 | 0 | 0 | 1.1 | 0.5 | 0 | 2.2 | 0 | 0.6 | 4.2 | 0.9 | 0.8 | 0 | 0 | 0 | 0 | 0 | 1.3 | 5.4 | 1.5 | 0.6 | 1.3 | 6.6 | 0.3 | 0.6 | 0.3 | 21.6 |
| Precipitation hours | 2 | 0 | 0 | 7 | 1 | 0 | 0 | 5 | 3 | 0 | 9 | 0 | 1 | 10 | 6 | 5 | 0 | 0 | 0 | 0 | 0 | 5 | 6 | 8 | 4 | 5 | 17 | 3 | 5 | 3 | 18 |
| Wind speed (m/s) | 39 | 30.4 | 36.8 | 46.6 | 40.4 | 17.3 | 27.9 | 25.1 | 28.6 | 37.2 | 37.4 | 32.3 | 30.2 | 51.8 | 58.1 | 47.5 | 32.7 | 28.4 | 28.8 | 21 | 29.4 | 45.4 | 45.8 | 34.3 | 28.5 | 41.8 | 46 | 31.1 | 38.2 | 46.1 | 45.9 |
In July 2023, the highest daytime temperature in St Martin was 20°C.
While the minimum temperature at night dropped to 14.5°C.
The average nighttime and daytime temperatures during July in St Martin are 15.8°C and 17.1°C respectively.
The precipitation sum in July is about 55 mm.