Weather in Osaka for September 2025
In general, the average temperature in Osaka at the beginning of September is 30.9 °C. As the month progressed, temperatures tended to noticeably cool down, reaching an average of 28 °C by the end of September.
Osaka experiences heavy rainfall in September, with over 20 rainy days and an average total precipitation 146.4 mm.
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Osaka in September average weather
| Mon. | Tue. | Wed. | Thu. | Fri. | Sat. | Sun. |
|---|---|---|---|---|---|---|
| 1  31° | 2  30° | 3 31° | 4 31° | 5 32° | 6 31° | 7 30° |
| 8 29° | 9 31° | 10  31° | 11 31° | 12 30° | 13  31° | 14 31° |
| 15 29° | 16 31° | 17 29° | 18 31° | 19  31° | 20 29° | 21 29° |
| 22 26° | 23  27° | 24 27° | 25 29° | 26  28° | 27 29° | 28 27° |
| 29 28° | 30 28° |
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Temperatures trend during September in Osaka
September weather day by day
| Date | Weather | Temperatures | Rain | UV | More |
|---|---|---|---|---|---|
| 1 Sept. | Patchy rain possible | 31° /23° | 6.4 mm | 7 | |
| 2 Sept. | Moderate or heavy rain shower | 30° /23° | 9.6 mm | 7 | |
| 3 Sept. | Moderate or heavy rain shower | 31° /23° | 5.3 mm | 7 | |
| 4 Sept. | Moderate or heavy rain shower | 31° /23° | 3.8 mm | 7 | |
| 5 Sept. | Patchy rain possible | 32° /23° | 2.3 mm | 7 | |
| 6 Sept. | Patchy rain possible | 31° /23° | 1.4 mm | 7 | |
| 7 Sept. | Patchy rain possible | 30° /22° | 0.8 mm | 7 | |
| 8 Sept. | Moderate rain at times | 29° /23° | 4.7 mm | 6 | |
| 9 Sept. | Patchy rain possible | 31° /23° | 23.1 mm | 7 | |
| 10 Sept. | Overcast | 31° /22° | 11.9 mm | 7 | |
| 11 Sept. | Moderate rain at times | 31° /23° | 3.9 mm | 7 | |
| 12 Sept. | Patchy rain possible | 30° /23° | 4.4 mm | 7 | |
| 13 Sept. | Partly cloudy | 31° /23° | 0.3 mm | 7 | |
| 14 Sept. | Partly cloudy | 31° /23° | 4.3 mm | 7 | |
| 15 Sept. | Patchy rain possible | 29° /23° | 2.6 mm | 7 | |
| 16 Sept. | Patchy rain possible | 31° /22° | 1.8 mm | 7 | |
| 17 Sept. | Patchy rain possible | 29° /24° | 4.4 mm | 6 | |
| 18 Sept. | Patchy rain possible | 31° /24° | 9.9 mm | 7 | |
| 19 Sept. | Cloudy | 31° /24° | 6.2 mm | 7 | |
| 20 Sept. | Patchy rain possible | 29° /21° | 3.7 mm | 7 | |
| 21 Sept. | Patchy rain possible | 29° /21° | 3.2 mm | 7 | |
| 22 Sept. | Light rain shower | 26° /21° | 10.6 mm | 6 | |
| 23 Sept. | Sunny | 27° /20° | 10.5 mm | 6 | |
| 24 Sept. | Overcast | 27° /19° | 0.2 mm | 6 | |
| 25 Sept. | Sunny | 29° /18° | 0.1 mm | 7 | |
| 26 Sept. | Heavy rain at times | 28° /20° | 1.9 mm | 6 | |
| 27 Sept. | Patchy rain possible | 29° /20° | 4.6 mm | 7 | |
| 28 Sept. | Light rain shower | 27° /20° | 3.2 mm | 6 | |
| 29 Sept. | Moderate rain at times | 28° /20° | 0.9 mm | 7 | |
| 30 Sept. | Partly cloudy | 28° /20° | 0.1 mm | 7 | |
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Guide for Osaka in September
In September, Osaka, Japan experiences a transition from the hot and humid summer to a more temperate autumn. At the beginning of the month, the weather remains quite warm and humid, with average daytime temperatures around 28° to 30°.
Nights are slightly cooler but still relatively warm, averaging around 22° to 24°. The humidity can be quite high, often exceeding 70%, which can make the heat feel more intense.
Rain is also common in early September, as the tail end of the typhoon season can bring heavy showers and occasional storms.
As the month progresses, the weather starts to cool down gradually. By the end of September, daytime temperatures typically range from 24° to 26°, while nighttime temperatures drop to a more comfortable range of 18° to 20°.
The humidity levels also begin to decrease, making the air feel fresher and more pleasant. Rainfall becomes less frequent, although occasional showers can still occur.
Overall, September in Osaka is a month of change, moving from the intense heat of summer to the more moderate and enjoyable conditions of autumn.
Visitors should be prepared for a mix of warm and cooler days, and it’s advisable to carry an umbrella due to the unpredictable nature of the weather during this transitional period.
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Osaka in September - FAQ
What to pack to Osaka in September?
As you prepare for your trip to Osaka 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 Osaka, 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
- Sandals/Flip-flops: Comfortable for warm climates
- 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 Osaka
UV exposure in Osaka during September
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