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Japan weather

Weather in Shinjuku for September 2025

Your guide to Shinjuku weather in September - trends and predictions

    Temperatures

  • Until now, September 2025 in Shinjuku has been nearly identical to the historical average, with a temperature of 27.4 °C (showing only a slight deviation of -0.2 °C).

  • Expect cooler weather in the next days in Shinjuku with the forecast suggesting a temperature of 25.7 °C, lower than the historical average.

  • In general, the average temperature in Shinjuku at the beginning of September is 27.1 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 24.7 °C by the end of September.

    • Rain 🌧️

  • The climate of Shinjuku in September is notably wet, with an average of 11 rainy days, and a total of 135.6 mm of precipitation.

    • More

  • Is September a good time to visit Shinjuku? check out the best time to travel to Shinjuku page.

  • New! Chat with our AI weatherman - it’s amazing and free.

Average dry days
19
Dry days
Average rainy days
11
Rainy days
Average snowy days
0
Snow days
Average temperatures
27°/24°
Temperatures
Average wind speed
29 km/h
Avg max wind
Average humidity
81 %
Avg humidity

Shinjuku Weather September

Move between months or click on a day
August
October
Mon.Tue.Wed.Thu.Fri.Sat.Sun.
1
Moderate or heavy rain shower
27°
2
Patchy rain possible
27°
3
Moderate or heavy rain shower
29°
4
Patchy rain possible
26°
5
Partly cloudy
27°
6
Sunny
27°
7
Sunny
27°
8
Cloudy
29°
9
Moderate rain at times
28°
10
Patchy rain possible
28°
11
Sunny
29°
12
Sunny
27°
13
Sunny
28°
14
Partly cloudy
29°
15
Patchy rain possible
29°
16
Moderate rain
28°
17
Partly cloudy
29°
18
Patchy rain possible
30°
19
Moderate rain
21°
20
Moderate rain
21°
21
Patchy rain possible
21°
22
Partly cloudy
25°
23
Patchy rain possible
24°
24
Patchy rain possible
23°
25
Partly cloudy
25°
26
Patchy rain possible
28°
27
Partly cloudy
27°
28
Patchy rain possible
24°
29
Overcast
23°
30
Light drizzle
23°

Temperatures trend during September in Shinjuku

See the weather trend as well as the moving average line

September weather in Shinjuku day by day

Click on a date for more information
August October
Date Weather Temperatures Rain UV More
1 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 27° /26° 8.3 mm 7
2 Sept. Patchy rain possible
Patchy rain possible
 27° /26° 0.1 mm 7
3 Sept. Moderate or heavy rain shower
Moderate or heavy rain shower
 29° /25° 30.6 mm 7
4 Sept. Patchy rain possible
Patchy rain possible
 26° /23° 14.1 mm 6
5 Sept. Partly cloudy
Partly cloudy
 27° /23° 27.5 mm 7
6 Sept. Sunny
Sunny
 27° /24° 0.1 mm 7
7 Sept. Sunny
Sunny
 27° /25° 0 mm 7
8 Sept. Cloudy
Cloudy
 29° /26° 0.4 mm 7
9 Sept. Moderate rain at times
Moderate rain at times
 28° /25° 1 mm 6
10 Sept. Patchy rain possible
Patchy rain possible
 28° /25° 2.4 mm 6
11 Sept. Sunny
Sunny
 29° /25° 4.5 mm 7
12 Sept. Sunny
Sunny
 27° /25° 3.8 mm 7
13 Sept. Sunny
Sunny
 28° /25° 0.2 mm 7
14 Sept. Partly cloudy
Partly cloudy
 29° /27° 0.1 mm 1.2
15 Sept. Patchy rain possible
Patchy rain possible
 29° /26° 1 mm 1.3
16 Sept. Moderate rain
Moderate rain
 28° /26° 6.8 mm 1.7
17 Sept. Partly cloudy
Partly cloudy
 29° /26° 0.1 mm 1.8
18 Sept. Patchy rain possible
Patchy rain possible
 30° /25° 2.7 mm 1.9
19 Sept. Moderate rain
Moderate rain
 21° /19° 14.2 mm 5
20 Sept. Moderate rain
Moderate rain
 21° /20° 14.2 mm 5
21 Sept. Patchy rain possible
Patchy rain possible
 21° /20° 4.7 mm 5
22 Sept. Partly cloudy
Partly cloudy
 25° /20° 0 mm 6
23 Sept. Patchy rain possible
Patchy rain possible
 24° /21° 2.2 mm 5
24 Sept. Patchy rain possible
Patchy rain possible
 23° /21° 0.9 mm 5
25 Sept. Partly cloudy
Partly cloudy
 25° /22° 0 mm 6
26 Sept. Patchy rain possible
Patchy rain possible
 28° /24° 0.1 mm 6
27 Sept. Partly cloudy
Partly cloudy
 27° /26° 0 mm 7
28 Sept. Patchy rain possible
Patchy rain possible
 24° /22° 2 mm 5
29 Sept. Overcast
Overcast
 23° /21° 0.2 mm 5
30 Sept. Light drizzle
Light drizzle
 23° /22° 1.2 mm 5
Next
Important Notice
Our weather forecast for Shinjuku in September is based on the analysis of historical data rather than real-time forecast models. While this provides a general overview, weather conditions can change. We recommend that you check the Shinjuku forecast closer to your planned date for the most up-to-date weather information.
Change Month
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Shinjuku weather in September vs August vs October

Compare September weather in Shinjuku with the previous and following months. See how temperature, rainfall, wind, and other conditions change throughout the year to help you plan your visit.
AugustSeptemberOctober
WeatherPatchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Patchy rain possible
Temperatures28°/26°27°/24°22°/19°
Rainfall219 mm136 mm211 mm
Wind24.8 km/h29.1 km/h31.4 km/h
Humidity81%81%76%
Rainy days15 days11 days15 days
Dry days16 days19 days16 days

Planning a trip to Shinjuku? Discover the best time to visit

Shinjuku in September - FAQ

What are the expected maximum and minimum temperatures in Shinjuku during September?
During September, expect a variety of temperatures with highs around 27° and lows near 24°, suitable for diverse activities and preferences.
How much rainfall should be expected in Shinjuku during September?
Significant rainfall exceeding 135.6 mm is expected in Shinjuku during September, occurring over more than 11 days. Preparing for wet conditions is recommended in your planning.
What are the typical wind conditions in Shinjuku during September?
The average wind speed in Shinjuku during September is 29 km/h, suggesting breezy to windy conditions, depending on your activities.

What to pack to Shinjuku in September?

As you prepare for your trip to Shinjuku in September, it's important to consider the typical weather patterns for the time of year. Below is a carefully tailored packing list to ensure that your time in Shinjuku, during September, is comfortable and enjoyable, regardless of the weather conditions.

  • Clothing
    • Lightweight Clothing: T-shirts, blouses, shorts, skirts
    • Rain Gear: Lightweight, waterproof clothing
  • Footwear
    • Waterproof Shoes
  • Accessories
    • Sunglasses: For sun protection
    • Sun Hats: Wide-brimmed hats for sun protection in warm weather
    • Umbrellas/Raincoats: For rainy days
  • Personal Items
    • Sunscreen: High SPF for sunny destinations
    • Lip Balm with SPF: To protect against chapped lips

September rainfall patterns in Shinjuku

Explore the daily rainfall trends and prepare for Shinjukus September weather 💧

UV exposure in Shinjuku during September

Stay informed about UV levels for safe outdoor activities throughout the month of September ☀️

Quick links

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Location coordinates Where is Shinjuku?

Get accurate weather forecasts for Shinjuku, located at latitude 35.295 and longitude 139.571. Stay updated with localized weather information tailored for Shinjuku.

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