In September, Nagano Prefecture begins to fall a little earlier than other areas of Honshu such as Tokyo, Osaka, and Kyoto, and although there are many hot days until mid-September, it becomes cooler and more comfortable in late September. However, as in other areas of Honshu, the weather in September can be unstable and affected by typhoons, so please pay attention to the weather forecast.

Overview of Nagano Prefecture’s climate (year-round)

Sightseeing scenery that simply shows the weather in Nagano in Sptember2

In Nagano Prefecture, the autumn foliage begins in September, starting in the mountainous areas. Photo: Senjyoshiki Curl in the Central Alps=Shutterstock

In Nagano prefecture, there is a big difference in climate depending on the location such as mountainous areas and basins. So, first, let’s get an overview of the climate of Nagano prefecture throughout the year.

Mountainous areas are cold and snowy

In Nagano prefecture in the central region of Honshu, mountainous areas (Japanese Alps) with an altitude of 2,000 to 3,000 m are connected from north to south, and major cities such as Nagano City and Matsumoto City are located in the basin. Mountainous areas such as Hakuba, Kamikochi, and Shiga Kogen are cold and ideal as summer resorts, but in winter it is very cold and it snows a lot.

Basins have relatively little snow

On the other hand, in Nagano City, Matsumoto City, Suwa City, Iida City, etc., which are located in the basin, the maximum temperature is as high as in Tokyo during the daytime in summer, but it is cool in the morning and evening. It doesn’t snow as much as in the mountains in winter, but it’s colder than in Tokyo and Osaka.

Karuizawa does not get much snow in winter

Karuizawa, an hour away from Tokyo on the Hokuriku Shinkansen, is a popular highland resort area as a summer resort. However, Karuizawa has much less snow than Hakuba and Shiga Kogen. The entire area of ​​Nagano has less rainfall than other areas such as Tokyo. The cherry blossoms bloom a little later than in Tokyo and after early April.

Frequently Asked Questions

What should I wear in Nagano Prefecture in September?

In the first half of September, summer clothes are still basically acceptable. However, the mornings and evenings become much cooler, so a light jacket is essential in the second half of September. In Kamikochi, Hakuba, Shiga Kogen, Karuizawa, etc., autumn clothes may be better. For more information on summer and autumn clothing, please refer to the articles below.

Is June the best season for sightseeing in Nagano Prefecture?

September is the transition period from summer to fall, so it is not necessarily the tourist season. Instead, hotel and other costs are often lower than in summer and fall. If you arrange your itinerary well, you will have an enjoyable trip. There are two things to keep in mind. First, be sure to check weather information such as typhoons. On days of heavy rain, you may want to take it easy and stay in your hotel. We recommend that you plan your itinerary leisurely. Then, in mid-September, there are many public holidays in Japan each year. Please keep in mind that trains and buses may be crowded on national holidays.

Weather in Nagano Pref. in early September

Sightseeing scenery that simply shows the weather in Nagano in Sptember5

Matsumoto, Japan – September 6, 2016: Matsumoto castle with pond and tourists on sunny day = Shutterstock

Sightseeing scenery that simply shows the weather in Nagano in Sptember6

Unidentified couple, walk along Tsumago village on September 9, 2012 , Nagano, Japan. Tsumago, the traditional architectural village, have real community with historical appearance = Shutterstock

Average temperature
Highest temperature
(Lowest temperature)
Total precipitation
(Total snowfall depth)
Nagano City 23.3℃  (73.9°F)
28.7℃  (83.7°F)
19.5 ℃ (67.1°F)
39.6 mm (1.56 inch)
Matsumoto 22.8℃  (73.0°F)
28.8℃  (83.8°F)
18.6 ℃ (65.5°F)
39.2 (1.54 inch)
Hakuba 20.4 ℃  (68.7°F)
25.9℃  (75.0°F)
16.7 ℃ (62.1°F)
56.9 mm (2.24 inch)
Karuizawa 18.9℃  (66.0°F)
23.9℃  (75.0°F)
15.3 ℃ (59.5°F)
71.1 mm (2.80 inch)

※ Source: All figures are the average for 30 years of 1991-2020 announced by the Japan Meteorological Agency

Weather in Nagano Pref. in mid-September

Sightseeing scenery that simply shows the weather in Nagano in Sptember4

MATSUMOTO, NAGANO PREFECTURE, JAPAN – SEPTEMBER 14, 2014: Visitors resting at Kamonji-goya, the oldest hut in Kamikochi. Built in 1880, it now serves as a restaurant/guesthouse to hikers = Shutterstock

Average temperature
Highest temperature
(Lowest temperature)
Total precipitation
(Total snowfall depth)
Nagano City 21.2℃  (70.2°F)
26.3℃  (79.3°F)
17.5 ℃ (63.5°F)
51.7 mm (2.04 inch)
Matsumoto 20.7℃  (69.3°F)
26.4℃  (79.5°F)
16.5 ℃ (61.7°F)
59.2 mm (2.33 inch)
Hakuba 18.4 ℃  (65.1°F)
23.7℃  (74.7°F)
14.6 ℃ (58.3°F)
69.9 mm (2.75 inch)
Karuizawa 17.0 ℃  (62.6°F)
22.0℃  (71.6°F)
13.4 ℃ (56.1°F)
70.2 mm (2.76 inch)

※Source:  All figures are the average for 30 years of 1991-2020 announced by the Japan Meteorological Agency

Weather in Nagano Pref. in late September

Sightseeing scenery that simply shows the weather in Nagano in Sptember3

Matsumoto Castle in Matsumoto City, Nagano Prefecture, Japan, September 23-Shutterstock

Average temperature
Highest temperature
(Lowest temperature)
Total precipitation
(Total snowfall depth)
Nagano City 18.5℃  (65.3°F)
23.5℃  (74.3°F)
14.6 ℃ (58.3°F)
34.2 mm (1.35 inch)
Matsumoto 17.8 ℃  (64.0°F)
23.3℃  (73.9°F)
13.5 ℃ (56.3°F)
49.6 mm (1.95 inch)
Hakuba 15.8 ℃  (60.4°F)
21.2℃  (70.2°F)
11.7 ℃ (53.1°F)
55.1 mm (2.17 inch)
Karuizawa 14.2℃  (57.6°F)
19.2℃  (66.6°F)
10.4 ℃ (50.7°F)
52.3 mm (2.06 inch)

※ Source: All figures are the average for 30 years of 1991-2020 announced by the Japan Meteorological Agency

What to wear in Japan during spring

For more information on summer and autumn clothing, please refer to the articles below.

Monthly weather in Nagano Pref.

Below are articles about the weather in Nagano Prefecture. Click on the month of interest to see articles about that month.

January February March
April May June
July August September
October November December

Weather in tourist destinations around Japan

Below are pages showing the climates of various regions in Japan at the same time of the year.

Tokyo Osaka Kyoto
Hokkaido Sendai Nagano
Nagoya Hiroshima Fukuoka
Okinawa

 

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