Guernsey Monthly Rainfall & Precipitation
This page shows both the average monthly rainfall and the number of rainy days in Guernsey, Guernsey island, United Kingdom. These values are calculated using 30 years of data (1990–2020) to ensure accuracy. Now, let's break down all the details for a clearer picture.
Generally, Guernsey receives mid-range precipitation levels, with 964 mm (38 in) annually.
Monthly Precipitation Levels
The average number of days each month with precipitation (> 0.2 mm (0.01 in))
Guernsey can be quite wet during December, receiving approximately 131 mm (5.2 in) of precipitation over 19 rainy days.
In contrast July, experiences much drier conditions, with 41 mm (1.6 in) of rainfall, spread across 10 rainy days.
December, the wettest month, has a maximum daytime temperature of 12°C (54°F). The city receives 61 hours of sunshine in this period. During the driest month July you can expect a temperature of 18°C (64°F). For more detailed insights into the city's temperatures, visit our Guernsey Temperature page.
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in June
Explore Guernsey's Historical Precipitation: 1976-2026
Browse day-by-day precipitation records for Guernsey spanning 51 years. Select any month and year to see actual rainfall and snowfall recorded on each day.
Annual Rainfall in the United Kingdom: City Comparison
The map below shows the annual precipitation across the United Kingdom. You can also select the different months in case you are interested in a specific month.
heavy rainfall
high
moderate
low
almost none
Guernsey vs World: Rainfall Compared
Guernsey's average annual precipitation is 964 mm (38 in). Let's compare this to some popular worldwide tourist destinations:
New York City, USA, receives 1276 mm (50 in) of rainfall annually, with precipitation evenly distributed throughout the year.
In Seoul, South Korea, the average annual precipitation is 1237 mm (49 in), with most rain falling during the summer monsoon season.
Melbourne, Australia, has 690 mm (27 in) of rainfall annually, spread fairly evenly throughout the year.
Singapore, situated near the equator, gets 2581 mm (102 in) of rainfall annually, with no distinct dry season and consistent monthly precipitation.
Precipitation amounts are measured using specific gauges installed at weather stations, collecting both rain and snow and any other type of precipitation. Rainfall is measured directly in millimeters, while that from snow and ice is obtained by melting it. Automated systems often incorporate heaters to make this easier.
Information from these stations is transmitted via Wi-Fi, satellite, GPS, or telephone connections to central monitoring networks. This information is immediately updated and integrated into weather models and forecasts.
The proximity of a location to a large body of water can significantly affect its rainfall patterns:
- Ocean Influence: Coastal regions typically receive more rainfall due to the presence of moisture-laden winds from the ocean. These regions tend to have more humid climates and experience more frequent precipitation, especially in winter.
- Continental Climates: Areas further from the sea, such as inland or continental regions, experience less frequent rainfall and more extreme seasonal variations in precipitation.
- The U.S. has a significant number of thunderstorms every year, with over 14.6 million taking place across the world annually.
- Approximately 70% of lightning bolts strike land rather than oceans.
- A storm named John was the longest-lasting Pacific tropical storm, continuing for 31 days. As it crossed the dateline twice, it changed status from a hurricane to a typhoon and back to a hurricane.
For more detailed information about Guernsey's weather, including sunshine hours, humidity levels, and temperature data, visit our Guernsey Climate page.
