Mostyn, United Kingdom experiences average highs of 13°C (55°F) and lows of 8°C (46°F) throughout the year. Rainfall is frequent, averaging about 14 rainy days per month. Average highs have warmed by 1.1°C (2.0°F) across the available records.
Mostyn, United Kingdom Weather & Climate 2026
Monthly climate averages for Mostyn, United Kingdom. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Oct 
Wetter season: Sep–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
4.8/10
Best: June, July, August, September
UV Index
3
Low
Temperature 13°C / 8°C
Feels Like 11°C / 5°C
Rainy Days 14
Rainfall 78 mm
Sunshine 7 h
Humidity 81%
Wind Speed 20 km/h
Dew Point 7°C
Snow Days 2 days
Frost Days 2 days
Hottest Month
19°C
July
Avg Low13°C
Rain14days
Coldest Month
3°C
January
Avg High7°C
Rain13days
Driest Month
12days
February
Avg High8°C
Avg Low4°C
Windiest Month
24 km/h
February (Gusts 51)
Sea Temperature
6°C – 19°C
Warmest water: August (
18.7°C
)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 04:46
Daylight 17h
Sunset 21:44
Live conditions—
Mostyn on the map · live conditions
Mostyn, United Kingdom
- Continent
- Europe
- Country
- United Kingdom
- City
- Mostyn
- Population
- 1.6K
- Coordinates
- 53.31°, -3.27°
Seasonal Breakdown
Spring
Mar–May
Avg High 12°C
Avg Low 6°C
Rain 13 days/mo
Summer
Jun–Aug
Avg High 18°C
Avg Low 13°C
Rain 14 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 13°C
Avg Low 9°C
Rain 15 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 8°C
Avg Low 4°C
Rain 13 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
HighLowShaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 7°C / 3°C . Feb: 8°C / 4°C . Mar: 9°C / 4°C . Apr: 12°C / 6°C . May: 15°C / 9°C . Jun: 18°C / 12°C . Jul: 19°C / 13°C . Aug: 19°C / 14°C . Sep: 17°C / 12°C . Oct: 14°C / 9°C . Nov: 10°C / 6°C . Dec: 8°C / 5°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 76 mm. Feb: 69 mm. Mar: 71 mm. Apr: 59 mm. May: 63 mm. Jun: 88 mm. Jul: 89 mm. Aug: 73 mm. Sep: 96 mm. Oct: 86 mm. Nov: 79 mm. Dec: 86 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 85%. Feb: 82%. Mar: 81%. Apr: 77%. May: 77%. Jun: 77%. Jul: 79%. Aug: 79%. Sep: 81%. Oct: 83%. Nov: 85%. Dec: 87%.
Monthly Wind Speed
Wind SpeedGusts
Bar chart showing monthly wind speed. Jan: 21 km/h . Feb: 24 km/h . Mar: 21 km/h . Apr: 19 km/h . May: 18 km/h . Jun: 18 km/h . Jul: 18 km/h . Aug: 19 km/h . Sep: 19 km/h . Oct: 21 km/h . Nov: 21 km/h . Dec: 22 km/h .
Sunshine
Sunshine
Sunshine: Jan: 4h. Feb: 5h. Mar: 7h. Apr: 10h. May: 11h. Jun: 11h. Jul: 11h. Aug: 10h. Sep: 8h. Oct: 6h. Nov: 4h. Dec: 3h.
Sea Temperature
Sea Temperatureswim
Line chart showing monthly sea temperature. Jan: 6°C . Feb: 6°C . Mar: 8°C . Apr: 10°C . May: 14°C . Jun: 17°C . Jul: 19°C . Aug: 19°C . Sep: 17°C . Oct: 13°C . Nov: 10°C . Dec: 7°C .
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 1. Feb: UV 2. Mar: UV 3. Apr: UV 5. May: UV 5. Jun: UV 6. Jul: UV 5. Aug: UV 5. Sep: UV 3. Oct: UV 2. Nov: UV 1. Dec: UV 1.
Monthly Daylight Hours
Daylight12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow DaysSnowfall
Snow Days: Jan: 3 days. Feb: 2 days. Mar: 2 days. Apr: 0 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 1 days. Dec: 2 days.
Climate Trends
Average highs have warmed by 1.1°C (2.0°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Aug 2025 · 20°C | Jul · 19°C |
| Coldest month | Jan 2025 · 2°C | Jan · 3°C |
| Wettest month | Nov 2025 · 122 mm | Sep · 96 mm |
| Windiest month | Nov 2025 · 22 km/h | Feb · 24 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Fair May
Fair June best
Good July best
Excellent August best
Excellent September best
Fair October
Fair November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 7°C / 3°C | 4°C / -1°C | 13days (76 mm) Wet | 3.5h Poor | 85% Humid | 0.9 Low | Poor | View Details |
| February | 8°C / 4°C | 4°C / 0°C | 12days (69 mm) Wet | 5.1h Fair | 82% Humid | 1.5 Low | Poor | View Details |
| March | 9°C / 4°C | 6°C / 0°C | 14days (71 mm) Wet | 7.2h Good | 81% Humid | 3.2 Moderate | Poor | View Details |
| April | 12°C / 6°C | 9°C / 2°C | 12days (59 mm) Wet | 9.7h Good | 77% Humid | 4.5 Moderate | Fair | View Details |
| May | 15°C / 9°C | 13°C / 7°C | 12days (63 mm) Wet | 11.2h Excellent | 77% Humid | 5.4 High | Fair | View Details |
| June best | 18°C / 12°C | 17°C / 10°C | 14days (88 mm) Wet | 11.3h Excellent | 77% Humid | 6 High | Good | View Details |
| July best | 19°C / 13°C | 18°C / 12°C | 14days (89 mm) Wet | 10.8h Excellent | 79% Humid | 5.4 High | Excellent | View Details |
| August best | 19°C / 14°C | 18°C / 12°C | 13days (73 mm) Wet | 10h Excellent | 79% Humid | 5 Moderate | Excellent | View Details |
| September best | 17°C / 12°C | 15°C / 10°C | 15days (96 mm) Wet | 7.6h Good | 81% Humid | 3.4 Moderate | Fair | View Details |
| October | 14°C / 9°C | 11°C / 7°C | 14days (86 mm) Wet | 5.8h Fair | 83% Humid | 2.2 Moderate | Fair | View Details |
| November | 10°C / 6°C | 7°C / 3°C | 15days (79 mm) Wet | 3.8h Poor | 85% Humid | 1.1 Low | Poor | View Details |
| December | 8°C / 5°C | 5°C / 1°C | 15days (86 mm) Wet | 2.8h Poor | 87% Very Muggy | 0.7 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Mostyn are June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Mostyn, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Mostyn is July, with average daytime highs of 19°C (66°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Mostyn is January, with average overnight lows of 3°C (38°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Mostyn is September, averaging 96mm of precipitation across 15 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Mostyn runs through September, November, December, March, with the heaviest rainfall in September. Based on 10-year averages for Mostyn.
Mostyn receives approximately 89 sunshine hours per year. The sunniest month is June with around 11 hours. Based on climate data for Mostyn.
The least favorable months to visit Mostyn are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider June, July, August, September instead.
The annual average UV index in Mostyn is 3, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Mostyn is 81%, classified as humid. High humidity makes warm temperatures feel significantly hotter — lightweight, breathable clothing is recommended.
Sea temperatures in Summer average 12°C (54°F), which most swimmers will find too cold without a wetsuit.
Yes, Mostyn receives snow. Months with snowfall average 2 snow days and 2 cm (1 in) of accumulation, with about 2 frost days during winter.
Average wind speeds in Mostyn are 20 km/h (12 mph). The windiest month is February with peak winds reaching 24 km/h (15 mph) (gusts up to 51 km/h / 32 mph).
Mostyn averages 1 clear-sky days per month with overall cloud cover around 72%. The clearest skies occur in April.
The annual average dew point in Mostyn is 7°C (45°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Mostyn has a Oceanic climate, classified as Cfb under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Mostyn ranges from 5°C (41°F) to 11°C (52°F) on average. Wind chill makes winters feel noticeably colder than the actual temperature — layered clothing is recommended.
Yes, June is a great time to visit Mostyn. It earns a climate score of 7/10 with Good.
For June in Mostyn, pack Layered clothing, Light jacket, Umbrella, Waterproof jacket, Waterproof shoes. With average highs of 18°C (64°F) and 14 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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