Cool
Average highs are around 2°C, so pack for cooler days.
January verdict
Poor for holiday weather
Average highs are around 2°C, so pack for cooler days. Sunshine averages 4h per day, so this is not one of the brighter months. Rainfall averages 53mm, which is relatively low for holiday planning.
Monthly averages
Temp
2°C
Rain
53mm
Sun
4h
Sea
11°C
Weather score
21
Poor
Cool
Average highs are around 2°C, so pack for cooler days.
Drier
Rainfall averages 53mm, which is relatively low for holiday planning.
Limited sun
Sunshine averages 4h per day, so this is not one of the brighter months.
Cool sea
Sea temperatures average 11°C, so the water can feel cool.
Map
Compare Shiroishi, Japan with nearby places by weather score, rain, sun, temperature, and swim conditions.
January2°C average high
January has some of the coolest average daytime highs of the year, so pack for fresher conditions.
Warmest monthsJune to September
This stretch sets the upper range for average daytime heat.
January53mm average rain
January is one of Shiroishi's driest months, making outdoor days easier to plan than in wetter parts of the year.
Driest monthsJanuary to April and November to December
This is the drier part of the year, when outdoor plans usually need less weather flexibility.
January4 hours average sun
January is one of Shiroishi's cloudier months, so sunshine-led plans are less reliable.
Brightest monthsApril to May
This stretch has the strongest sunshine in the monthly averages.
January11°C average sea
January is below Shiroishi's yearly sea-temperature average, so swimming can feel fresher.
Warmest seaJuly to September
Sea temperatures are usually near 21°C in this stretch, so swimming comfort is at its strongest.
January21 weather score
January is one of the weakest weather-score months, when the overall mix is less favourable than the rest of the year.
Best weather monthsJuly to August
These months have the strongest weather score in the monthly averages.
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