Day
23 °C
Night
15 °C
Sea
18 °C
Precipitation
103 mm
in month
Rainy days
10 days
in month
Daylight
15 hours
average
Sunshine
5 hours
average
Humidity
81 %
The week of 23 June 2025 - 29 June 2025 had an average daily temperature of 23 °C (73 °F) and a minimum (nighttime) temperature of 17 °C (63 °F). These temperatures are slightly above the long-time average for Otaru, being 20 °C (68 °F) for daily temperatures and 12 °C (54 °F) for night temperatures. In the end, Friday was coldest day of the week. On average, the temperatures during various times of day (in local time) were recorded as: 7am 21 °C (70 °F), 10am 22 °C (72 °F), 1pm 23 °C (73 °F), 4pm 21 °C (70 °F), 7pm 18 °C (64 °F), 10pm 18 °C (64 °F).
There were 6 days without rain and 1 day with moderate rain during this week. Otaru received 13 mm (0.51 in) of precipitation throughout the week, which is slightly below its long-term average of 17 mm (0.67 in). During the daytime (from dawn to dusk), there was 61 % cloud coverage on average.
An average wind speed of 1.8 m/s was recorded. The air pressure was 1003 hpa - 1015 hpa. The average air humidity was 78 % in Otaru.
During the daytime (from dawn to dusk), there were in average: 6 hours clear skies, 1 hour partially overcast skies, 9 hours overcast skies and 0.5 hours rainy weather. At 03:57, on average, the sun rose, and at 19:19, the sun set.
Otaru, Japan typically experiences a moderate continental climate with day temperatures varying widely throughout the year. In the colder month of January, temperatures can drop as low as -1 °C (30 °F) during the day and -7 °C (19 °F) at night. The warmest month, August, sees daytime temperatures reaching 25 °C (76 °F) and nighttime temperatures of 17 °C (63 °F). The driest month, June, witnesses only 10 days of precipitation, while January is the wettest, featuring rain on 24 days of the month.
In January, the daytime temperature hits its lowest point in Otaru at -1 °C (30 °F), while the nighttime temperature also records its lowest at -7 °C (19 °F). The onset of the wet season is evident with 139 mm (5.46 in) of rainfall and 24 days of precipitation at its peak.
Otaru witnesses the beginning of a rise in day temperatures in February. The wet season persists, though rainfall amounts continue to decrease, reaching 103 mm (4.06 in). The month also marks the start of a decline in the number of rainy days and an increase in sunshine hours to 3 hours.
A decrease in rainy days continues in Otaru with only 17 days, and a reduction in rainfall to 78 mm (3.08 in) is also apparent. Daytime temperatures continue their upward trend at 3 °C (38 °F); night temperatures begin to increase as well. Sunshine hours see an increase to 5 hours.
Day temperatures in Otaru in April show a similar increase to previous months, reaching 10 °C (50 °F), while the nighttime temperature also rises to 2 °C (35 °F). The continuation of the decline in rainy days to 11 days and a concurrent drop in rainfall amount to 61 mm (2.40 in) is observed. Humidity levels hit a year-long low at 68 %.
The upward trend of day temperatures in Otaru persists, with May seeing continued rises. The decline in rainy days seems consistent, registering 10 days. Sunlight hours peak at 6 hours.
With the tourist season's onset in June, Otaru experiences similar increases in daytime temperatures at 19 °C (66 °F), with a noticeable rise in night temperatures to 11 °C (51 °F). The number of rainy days reaches its yearly minimum at 10 days, and a low in rainfall is observed.
The tourist season peaks in July with daytime temperatures climbing to 23 °C (73 °F) and nighttime temperatures reaching 15 °C (60 °F). Rainfall starts to increase to 103 mm (4.05 in). Wind speeds drop to their lowest point at 4.
Observing the tourist season in full swing in August, there is a peak in both day and night temperatures in Otaru. Rainfall amounts show an upward trend similar to the previous month, measured at 133 mm (5.24 in), along with a beginning increase in the number of rainy days.
The tourist season persists in September, and Otaru witnesses a beginning decline in both day and nighttime temperatures. The number of rainy days continues to increase to 13 days, and sunshine hours start to rise again, reaching 6 hours.
There is a noticeable decline in daytime and nighttime temperatures in Otaru during October. The number of rainy days sees a rise to 16 days, and there's a start to the descent in rainfall amount at 119 mm (4.70 in). The decline in sunshine hours also becomes evident, with a reading of 5 hours.
The onset of the wet season is apparent in November, with a continued decrease in day temperatures at 8 °C (46 °F) and further cooling at night at 1 °C (33 °F). The rise in the number of rainy days continues with 20 days, and an increase in rainfall amount is observed at 145 mm (5.72 in).
The wet season is clearly in effect in December, with daytime temperatures descending to a similar extent as in the previous month at 1 °C (34 °F), and nighttime temperatures following suit to -5 °C (24 °F). Maximum rainfall is reached at 150 mm (5.91 in). The least amount of sunlight is seen during this month.
In January, daytime temperatures in Otaru can plunge to -1 °C (30 °F), while nighttime conditions are even chillier at -7 °C (19 °F).
February marks a gradual improvement in weather with decreasing rainfall and an uptick in sunshine, despite the continuation of the wet season.
March sees fewer rainy days, lowered rainfall, and the promise of milder days with slightly warmer temperatures.
Yes, April features the lowest humidity levels of the year in Otaru at 68 %.
Certainly, May offers more sunshine hours and fewer rainy days, making it favorable for enjoying the outdoors.
The start of the tourist season in June sees comfortable daytime temperatures and the least number of rainy days, perfect for vacation-goers.
July experiences the calmest winds of the year, alongside the continued rise in temperatures and the onset of increased rainfall.
While August brings higher rainfall, the temperatures remain comfortably warm for visitors.
Yes, September still offers a decent amount of sunshine hours suitable for outdoor activities, despite the increasing rainy days.
October marks a clear transition towards cooler weather with fewer sunshine hours, signifying the advance of autumn.
Indeed, as the wet season commences, November brings a heightened chance of rainfall coupled with cooler temperatures.
The limited sunlight in December results in shorter days and potentially impacts daily activities and plans.