Castel Weather & Climate: Best Time to Visit

Average temperatures, rainfall, sunshine and the best time to visit Castel.

Climate overview of Castel

Temperatures in Castel, Guernsey, United Kingdom, shift moderately through the seasons. The warmest month is August at 19°C (66°F), and the coolest is February at 11°C (52°F).

Castel sees a moderate amount of rainfall, totalling around 964 mm (38 in) per year. Sunshine peaks in July, when the city sees around 8.4 hours of sunshine per day.

Castel Weather by Month

Pick a month to see the average temperature, rainfall and sunshine in Castel — and find the best time to visit.

Monthly Temperature in Castel

The weather in Castel changes moderately throughout the year, offering enough variation to appreciate each season. Average maximum daytime temperatures range from a pleasant 19°C (66°F) in August, the warmest time of the year, to a chilly 11°C (52°F) during cooler months like February.

At night, you can expect temperatures ranging from 16°C (61°F) in August to around 7°C (45°F) during February.

Check out our detailed temperature page for more information.

Temperature ranges by month

Rainfall in Castel

Generally, Castel receives mid-range precipitation levels, with 964 mm (38 in) annually. Significant seasonal changes in precipitation occur throughout the year. In the wettest month, December it receives high rainfall, averaging 131 mm (5.2 in) of precipitation, recorded across 19 rainy days. In contrast, the driest month July brings less rainfall, with 41 mm (1.6 in) over 10 rainy days. For more details, please visit our Castel Precipitation page.

The mean monthly precipitation over the year, including rain, hail, and snow

Sunshine Hours in Castel

Seasonal changes in sunshine hours are quite dramatic in Castel. While July receives considerable daily sunshine with up to 8.4 hours, December marks the darkest time of the year, where sunshine is scarce with only 2.0 hours of sunlight per day.

Visit our detailed sunshine hours page for more information.

Monthly hours of sunshine


Daily hours of sunshine


Best Time to Visit Castel

Castel's weather is most enjoyable during July, August and September, with comfortable temperatures from 18°C (64°F) to 19°C (66°F). The moderate conditions ensure pleasant weather for exploring the area. Expect varied weather during this period with rainfall between 41 mm (1.6 in) and 66 mm (2.6 in), providing a good balance of sunny and rainy days.

Looking for inspiration on where to travel this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.

Frequently asked questions about the climate in Castel

What is the best time to visit Castel?

July, August and September typically offer the most optimal weather in Castel. In contrast, January and December tend to have less optimal conditions.

What temperatures can I expect in Castel?

Daytime highs range from 11°C (52°F) in February to 19°C (66°F) in August. Nighttime lows range from 7°C (45°F) to 16°C (61°F).

How much rain does Castel get?

Annual rainfall is around 964 mm (38 in). December is the wettest month with 131 mm (5.2 in), while July is the driest with 41 mm (1.6 in).

How sunny is Castel?

Castel receives around 1,888 hours of sunshine per year. July is the sunniest month with 252 hours, while December is the cloudiest with just 61 hours.

Castel 3-Day Forecast

Castel 3-Day Forecast

Castel on the map

Castel is highlighted — select any city to see its climate.

Popular this month

Where to go in July — average daytime high across popular destinations.

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