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Contents
- The climate of Nagano
- The best time to visit Nagano
- The worst time to visit Nagano
- Spring weather in Nagano
- Summer weather in Nagano
- Autumn weather in Nagano
- Winter weather in Nagano
- Weather in January
- Weather in February
- Weather in March
- Weather in April
- Weather in May
- Weather in June
- Weather in July
- Weather in August
- Weather in September
- Weather in October
- Weather in November
- Weather in December
- Frequently asked questions
- Average temperature
- Average humidity
- Average rainfall
- Average rainfall days
- Average snowfall
- Average snowfall days
- Average daylight
- Average sunshine
Climate and monthly weather forecast
The climate of Nagano
Due to its geographical location in the inland area of Japan, Nagano city has a Humid continental climate with no dry season and warm summers, according to the Köppen climate classification. Both the climate and geographical position of the city greatly affect the weather patterns observed throughout the year.
Nagano experiences a broad contrast between high and low temperatures. The highest temperatures are observed in summer, specifically in the month of August, ranging from 25.7°C (78.3°F) to 31°C (87.8°F), while the coldest period is winter, particularly during January, with temperatures fluctuating between -4.1°C (24.6°F) and 3.5°C (38.3°F). The shift in temperature from one extreme to the other is noticeable as the seasons transition from spring to winter.
In terms of rainfall, the city encounters a regular and abundant rain with the most significant rain events occurring from June to September. June stands out with 109mm (4.29") of rain, while July and September also experience heavy rainfall exceeding 100mm (3.94"). December and February have the least rainfall, measuring 46mm (1.81") and 44mm (1.73") respectively.
Unique weather conditions in Nagano include a significant amount of snowfall, primarily occurring from December to March. The heaviest snowfall is reported in January with 980mm (38.58") of snow.
Relative humidity in Nagano stays relatively constant throughout the year, ranging between 61% and 78%. The sunniest months are from April to August, with sunshine hours reaching up to 14.6 hours per day in June.
Nagano experiences a broad contrast between high and low temperatures. The highest temperatures are observed in summer, specifically in the month of August, ranging from 25.7°C (78.3°F) to 31°C (87.8°F), while the coldest period is winter, particularly during January, with temperatures fluctuating between -4.1°C (24.6°F) and 3.5°C (38.3°F). The shift in temperature from one extreme to the other is noticeable as the seasons transition from spring to winter.
In terms of rainfall, the city encounters a regular and abundant rain with the most significant rain events occurring from June to September. June stands out with 109mm (4.29") of rain, while July and September also experience heavy rainfall exceeding 100mm (3.94"). December and February have the least rainfall, measuring 46mm (1.81") and 44mm (1.73") respectively.
Unique weather conditions in Nagano include a significant amount of snowfall, primarily occurring from December to March. The heaviest snowfall is reported in January with 980mm (38.58") of snow.
Relative humidity in Nagano stays relatively constant throughout the year, ranging between 61% and 78%. The sunniest months are from April to August, with sunshine hours reaching up to 14.6 hours per day in June.
The best time to visit Nagano
Given its climatic variations, the ideal time to visit Nagano for outdoor activities and sightseeing is predominantly in the spring from March to May. During this period, the city experiences mild temperatures ranging from 9.5°C (49.1°F) to 22.5°C (72.5°F) with an average rainfall around 50mm (1.97") to 75mm (2.95") per month, and an average of 12 to 14 daylight hours.
The worst time to visit Nagano
Given the severe winters with temperatures dipping as low as -4.1°C (24.6°F) in January, and substantial snowfall reaching 820mm (32.28") to 980mm (38.58") from December to February, these months are generally regarded as the least favorable for visitors. However, this period could be of interest to those who enjoy winter sports or want to witness the unique beauty of a snow-covered landscape.
Spring weather in Nagano
Spring in Nagano, commencing in March and enduring up to May, signifies a welcome change from the harsh winter. The rising temperatures oscillate between -0.8°C (30.6°F) and 22.5°C (72.5°F) and average rainfall increases from 59mm (2.32") in March to 75mm (2.95") in May. By May, daylight hours have increased to 14.1 hours daily, offering more time for outdoor activities and sightseeing.
Summer weather in Nagano
Summers in Nagano, extending from June to August, are quite warm with temperatures reaching as high as 31°C (87.8°F). Humidity and rainfall are also at their peak during this period, with June receiving 109mm (4.29") of rain and July having a relative humidity of around 74%. Despite these conditions, summer days are long in Nagano, with 14.4 to 14.6 hours of daylight in June and July.
Autumn weather in Nagano
With temperatures ranging between 9.7°C (49.5°F) and 25.6°C (78.1°F), Autumn in Nagano, that stretches from September to November, is marked by cool and comfortable days. Rainfall begins to reduce, decreasing from 129mm (5.08") in September to 44mm (1.73") by November. Meanwhile, daylight hours start to shorten, falling from 12.4 hours in September to 10.2 in November.
Winter weather in Nagano
Winter in Nagano, from December to February, is synonymous with freezing temperatures and heavy snowfall. Subzero temperatures ranging from -4.1°C (24.6°F) to 4.7°C (40.5°F) are common, with hefty snowfall reaching up to 980mm (38.58") in January. Despite the harsh conditions, the city enjoys sparkling sunshine for 4.4 hours a day in December.
Weather in January
January marks the start of the year in Nagano, Japan with comparatively lower temperatures and significant levels of snowfall. The high average temperature for the month registers at 3.5°C (38.3°F), while the low plunges to -4.1°C (24.6°F). Weather in January »
Weather in February
It continues to be cold in Nagano, Japan in February, though the snowfall decreases compared to January. The average snowfall of 820mm (32.28") marks a reduction as this winter month unfolds. The chill in the air still persists, but with relatively milder temperatures, the city begins to anticipate the arrival of spring. Weather in February »
Weather in March
With March, the departure of the winter chill gradually begins in Nagano, Japan. The snowfall substantially reduces to an average of 270mm (10.63"), highlighting a clear shift in weather patterns. Warming temperatures connote the oncoming change of season, inducing a freshness in the air. Weather in March »
Weather in April
April witnesses a judicious mix of rainfall and warmth, paving the way for the full bloom of spring in Nagano, Japan. The snowfall essentially becomes a rare sight, standing at a minimal average of 30mm (1.18"). The temperature sustains a steady climb, making the days pleasantly warm and the nights mildly cool. Weather in April »
Weather in May
May brings with it an influx of warm weather and increased levels of rainfall in Nagano, Japan. The average rainfall amplifies to 75mm (2.95"), marking the onset of the city's rainy season. The temperatures continue their upward trend, resulting in a warm and humid atmosphere across the city. Weather in May »
Weather in June
June stands out as the month with the longest daylight hours in Nagano, Japan. The highest level of daylight graces the city with an average of 14.6 hours per day. As summer begins to set in, the temperature soars, and the instances of rainfall amount to a higher frequency. Weather in June »
Weather in July
July is typically the hottest month in Nagano, Japan with average temperatures reaching up to 29.1°C (84.4°F). The city groans under the burden of the summer heat, and the humidity levels rise in parallel, further exacerbating the hot conditions. Weather in July »
Weather in August
August continues the trend of soaring temperatures in Nagano, Japan, although comparatively cooler than July. The temperatures level off slightly, but the humidity persists, retaining the summer heat wave. This period highlights a decrease in rainfall, yet the occasional shower can cool the air momentarily. Weather in August »
Weather in September
September in Nagano, Japan presents itself with relatively high rainfall and a decrease in temperatures. The month trots in a higher average rainfall of 129mm (5.08"), the highest in the latter half of the year. This increased rainfall brings about a freshness to the city while also ushering in the autumn season. Weather in September »
Weather in October
October begins to bid adieu to the high rainfall season in Nagano, Japan, laying the groundwork for a crisp autumn climate. The rainfall decreases, and the temperature takes a significant dip, further emphasizing the arrival of fall. Weather in October »
Weather in November
Embracing the heart of fall, November in Nagano, Japan observes a further decrease in temperature. Persistent chilly winds and the first few flurries of snow signal the imminent approach of winter. The city is draped in a blanket of warm colors with leaves ranging from vivid reds to burnt oranges. Weather in November »
Weather in December
December rings in the winter season in full swing in Nagano, Japan. The city returns to the cool temperatures of the year's onset, with average temperatures sliding down to 6.8°C (44.2°F) and an increased snowfall of 450mm (17.72"). Weather in December »
Updated: Jan 31, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the coldest in Nagano?
In Nagano, January registers the lowest temperatures, averaging 3.5°C (38.3°F) at the peak and -4.1°C (24.6°F) at the lowest.
What is the most humid month in Nagano?
With an average relative humidity of 78%, January is the most humid month.
How much does it rain in Nagano?
Throughout the year, there are 129.8 rainfall days, and 933mm (36.73") of precipitation is accumulated.
When does it snow in Nagano?
January through April, November and December are months with snowfall in Nagano.
When does it snow the most in Nagano?
January is the month with the most snowfall in Nagano, Japan. Snow falls for 22.9 days and accumulates 980mm (38.58") of snow.
How many days does it snow in Nagano?
In Nagano, Japan, during the entire year, snow falls for 63 days and aggregates up to 2570mm (101.18") of snow.
What is the month with the least sunshine in Nagano?
With an average of 4.1h of sunshine, January has the least sunshine of the year in Nagano.
What is the least humid month in Nagano?
The least humid month in Nagano, Japan, is April, with an average relative humidity of 61%.
When it does not snow in Nagano?
May through October are months without snowfall.
What month has the most sunshine in Nagano?
With an average of 6.7h of sunshine, May has the most sunshine of the year in Nagano, Japan.
When are the longest days in Nagano?
With an average of 14h and 36min of daylight, June has the longest days of the year in Nagano.
What is the rainiest month in Nagano?
July is the month with the most rainfall. Rain falls for 13.1 days and accumulates 134mm (5.28") of precipitation.
What month is the hottest in Nagano?
In Nagano, the peak temperatures are generally noted in August, averaging a high of 31°C (87.8°F) and a low of 21.3°C (70.3°F).
What is the driest month in Nagano?
November is the month with the least rainfall in Nagano. Rain falls for 8.6 days and accumulates 44mm (1.73") of precipitation.
What is the month with the shortest days in Nagano?
The month with the shortest days in Nagano, Japan, is December, with an average of 9h and 42min of daylight.
Is there Daylight Saving Time (DST) in Nagano?
Nagano, Japan, does not observe Daylight Saving Time (DST). JST timezone is used over the entire year.
Average temperature
Nagano, Japan
The warmest month (with the highest average high temperature) is August (31°C).
The month with the lowest average high temperature is January (3.5°C).
The month with the highest average low temperature is August (21.3°C).
The coldest month (with the lowest average low temperature) is January (-4.1°C).
Average humidity
Nagano, Japan
The month with the highest relative humidity is January (78%).
The month with the lowest relative humidity is April (61%).
Average rainfall
Nagano, Japan
- Average rainfall in January:
51.1mm - Average rainfall in February:
49.8mm - Average rainfall in March:
59.4mm - Average rainfall in April:
53.9mm - Average rainfall in May:
75.1mm - Average rainfall in June:
109.2mm
- Average rainfall in July:
134.4mm - Average rainfall in August:
97.8mm - Average rainfall in September:
129.4mm - Average rainfall in October:
82.8mm - Average rainfall in November:
44.3mm - Average rainfall in December:
45.5mm
The wettest month (with the highest rainfall) is July (134.4mm).
The driest month (with the least rainfall) is November (44.3mm).
Average rainfall days
Nagano, Japan
- Average rainfall days in January:
13 days - Average rainfall days in February:
11.5 days - Average rainfall days in March:
12 days - Average rainfall days in April:
9.2 days - Average rainfall days in May:
10 days - Average rainfall days in June:
11.4 days
- Average rainfall days in July:
13.1 days - Average rainfall days in August:
9.8 days - Average rainfall days in September:
11.7 days - Average rainfall days in October:
9.1 days - Average rainfall days in November:
8.6 days - Average rainfall days in December:
10.4 days
The month with the highest number of rainy days is July (13.1 days).
The month with the least rainy days is November (8.6 days).
Average snowfall
Nagano, Japan
The month with the highest snowfall is January (980mm).
The months with the least snowfall are May, June, July, August, September and October (0mm).
Average snowfall days
Nagano, Japan
- Average snowfall days in January:
22.9 days - Average snowfall days in February:
19.6 days - Average snowfall days in March:
8.2 days - Average snowfall days in April:
0.6 days - Average snowfall days in May:
0 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0 days - Average snowfall days in November:
0.9 days - Average snowfall days in December:
10.8 days
The month with the highest number of snowfall days is January (22.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight / Average sunshine
Nagano, Japan
- Average daylight in January:
10h and 0min - Average daylight in February:
10h and 5min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 1min - Average daylight in May:
14h and 1min - Average daylight in June:
14h and 4min
- Average daylight in July:
14h and 2min - Average daylight in August:
13h and 3min - Average daylight in September:
12h and 2min - Average daylight in October:
11h and 2min - Average daylight in November:
10h and 1min - Average daylight in December:
9h and 4min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in January:
4h and 1min - Average sunshine in February:
4h and 4min - Average sunshine in March:
5h and 2min - Average sunshine in April:
6h and 4min - Average sunshine in May:
6h and 4min - Average sunshine in June:
5h and 2min
- Average sunshine in July:
5h and 2min - Average sunshine in August:
6h and 4min - Average sunshine in September:
4h and 4min - Average sunshine in October:
4h and 5min - Average sunshine in November:
4h and 4min - Average sunshine in December:
4h and 2min
The month with the most sunshine is May (Average sunshine: 6h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
