Cool
Average highs are around 15°C, so pack for cooler days.
Weather Guide
Lewis, United Kingdom Average Monthly Weather
Weather score15Poor annual avg
Best months: June, May, July
Across the year, average daytime temperatures are around 10°C, sunshine averages 3.3h per day, and rainfall totals about 1585mm. Sea temperatures average 11°C across the year.
Annual weather
Annual averages
Temp
10°C
Rain
1585mm
Annual total
Sun
3.3h
Sea
11°C
Weather score
15
Poor avg
Seasonal climate calendar
TemperatureTemp
RainRain
SunSun
SwimSwim
Weather scoreWeather score
Trip feel
Showers
Rainfall averages 110mm, so some wet days are possible.
Limited sun
Sunshine averages 4.2h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 13°C, so the water can feel cool.
Map
Weather map
Compare Lewis, United Kingdom with nearby places by weather score, rain, sun, temperature, and swim conditions.
Temperature
August15°C average high
August is one of Lewis' hottest months, so shade and slower afternoons matter.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
Rain
August110mm average rain
August sits on the drier side of Lewis' year, which helps with sightseeing and transfers.
Driest monthsFebruary and April to August
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
Sun
August4.2 hours average sun
August sits close to Lewis' yearly sunshine average, so it is a middle-of-the-pack month for bright days.
Brightest monthsApril to June
This stretch has the strongest sunshine in the monthly averages.
Sea temperature
August13°C average sea
August is one of Lewis' warmest sea months, when swimming comfort is usually strongest.
Warmest seaJuly to October
Sea temperatures are usually near 13°C in this stretch, so swimming comfort is at its strongest.
Weather score
August22 weather score
August scores above Lewis' yearly average, so the overall weather mix is stronger than most months.
Best weather monthsApril to August
These months have the strongest weather score in the monthly averages.
