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Caernarfon, United Kingdom Snapshot 2026
Where is Caernarfon?
Caernarfon, United Kingdom
- Continent
- Europe
- Country
- United Kingdom
- City
- Caernarfon
- Population
- 9.7K
- Coordinates
- 53.14°, -4.27°
Caernarfon is a city in United Kingdom with a population of approximately 9.7K. Average temperatures range from 4°C (40°F) in January to 18°C (65°F) in July. The best time to visit is May, June, July, August, September.
Time in Caernarfon right now
Open full time & time zone page 05:49 49
Tuesday, June 16, 2026
IANA time zone
Europe/London
Daylight saving
DST in effect
GMT / BST
Next DST change
October 25
backward -1h
Live weather in Caernarfon
Daylight in Caernarfon today
View full sunrise & sunset page Sunrise
Sunset
Day length
16h 56m
Climate normals for Caernarfon
Long-term monthly averages based on historical data.
January
Poor 
February
Poor March
Poor April
Fair May best
Fair June best
Good July best
Good August best
Good September best
Fair October
Poor November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 8°C / 4°C | 4°C / 0°C | 15days (96 mm) Wet | 3.6h Poor | 85% Humid | 0.9 Low | Poor | View Details |
| February | 8°C / 5°C | 4°C / 0°C | 14days (90 mm) Wet | 5.3h Fair | 83% Humid | 1.3 Low | Poor | View Details |
| March | 10°C / 5°C | 6°C / 1°C | 16days (84 mm) Wet | 7.3h Good | 82% Humid | 3.1 Moderate | Poor | View Details |
| April | 12°C / 6°C | 9°C / 3°C | 13days (68 mm) Wet | 9.7h Good | 78% Humid | 4.2 Moderate | Fair | View Details |
| May best | 15°C / 9°C | 13°C / 7°C | 12days (63 mm) Wet | 11.6h Excellent | 79% Humid | 5.4 High | Fair | View Details |
| June best | 17°C / 12°C | 16°C / 10°C | 14days (82 mm) Wet | 11.4h Excellent | 80% Humid | 5.6 High | Good | View Details |
| July best | 18°C / 14°C | 18°C / 12°C | 16days (80 mm) Wet | 10.9h Excellent | 82% Humid | 5.1 High | Good | View Details |
| August best | 18°C / 14°C | 17°C / 13°C | 16days (82 mm) Wet | 9.9h Good | 83% Humid | 4.8 Moderate | Good | View Details |
| September best | 17°C / 12°C | 15°C / 10°C | 16days (107 mm) Wet | 7.8h Good | 83% Humid | 3.3 Moderate | Fair | View Details |
| October | 14°C / 10°C | 11°C / 7°C | 16days (109 mm) Wet | 5.8h Fair | 83% Humid | 2.2 Moderate | Poor | View Details |
| November | 10°C / 7°C | 7°C / 4°C | 17days (108 mm) Wet | 3.9h Poor | 84% Humid | 1.1 Low | Poor | View Details |
| December | 9°C / 6°C | 5°C / 2°C | 17days (113 mm) Wet | 2.9h Poor | 87% Very Muggy | 0.6 Low | Poor | View Details |
Monthly Temperatures
HighLow
Line chart showing monthly temperatures. Jan: 8°C / 4°C . Feb: 8°C / 5°C . Mar: 10°C / 5°C . Apr: 12°C / 6°C . May: 15°C / 9°C . Jun: 17°C / 12°C . Jul: 18°C / 14°C . Aug: 18°C / 14°C . Sep: 17°C / 12°C . Oct: 14°C / 10°C . Nov: 10°C / 7°C . Dec: 9°C / 6°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 96 mm. Feb: 90 mm. Mar: 84 mm. Apr: 68 mm. May: 63 mm. Jun: 82 mm. Jul: 80 mm. Aug: 82 mm. Sep: 107 mm. Oct: 109 mm. Nov: 108 mm. Dec: 113 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 85%. Feb: 83%. Mar: 82%. Apr: 78%. May: 79%. Jun: 80%. Jul: 82%. Aug: 83%. Sep: 83%. Oct: 83%. Nov: 84%. Dec: 87%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 25 km/h . Feb: 28 km/h . Mar: 24 km/h . Apr: 20 km/h . May: 19 km/h . Jun: 21 km/h . Jul: 20 km/h . Aug: 22 km/h . Sep: 23 km/h . Oct: 24 km/h . Nov: 25 km/h . Dec: 26 km/h .
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 7°C . Feb: 8°C . Mar: 8°C . Apr: 10°C . May: 14°C . Jun: 16°C . Jul: 17°C . Aug: 18°C . Sep: 17°C . Oct: 14°C . Nov: 11°C . Dec: 9°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 1. Feb: UV 1. Mar: UV 3. Apr: UV 4. May: UV 5. Jun: UV 6. Jul: UV 5. Aug: UV 5. Sep: UV 3. Oct: UV 2. Nov: UV 1. Dec: UV 1.
Frequently Asked Questions
Caernarfon has a population of approximately 9.7K.
The best months to visit Caernarfon are May, June, July, August, September, when temperatures are pleasant and rainfall is lower.
Caernarfon receives approximately 1082mm of rainfall annually across 182 rainy days.
Caernarfon is located in United Kingdom, in the Europe region.