Aichi weather in September
September is a fair month to visit Aichi: highs of 27°C (81°F) and about 215 mm (8.5 in) of rain on average. Nights average 20°C (69°F) and cloud cover 71% (NASA POWER, 2001–2025 averages). The sea averages 29°C (84°F). It is the 2nd wettest month of the year and the 3rd warmest. Compared with August, it is cooler and wetter; October brings highs of 22°C (72°F) and 189 mm (7.4 in) of rain.
Figures are long-term averages for Nagoya, the largest city in Aichi. See below for other places.
Is September a good time to visit Aichi?
fair month Weather score 50/100.
September is a fair month in Aichi. The weather is usually best in Apr–May, Aug, Oct–Nov.
Does it rain a lot in Aichi in September?
Yes, it is one of the rainy months: about 215 mm (8.5 in) falls in an average September. It is the 2nd wettest month of the year.
How warm is Aichi in September?
Days average 27°C (81°F) and nights 20°C (69°F).
Aichi weather by month
| Month | High | Low | Rain | Cloud | Sea | Weather |
|---|---|---|---|---|---|---|
| January | 8°C (46°F) | 1°C (33°F) | 73 mm | 75% | 8°C (47°F) | least pleasant |
| February | 9°C (49°F) | 1°C (34°F) | 80 mm | 73% | 8°C (47°F) | least pleasant |
| March | 13°C (55°F) | 4°C (39°F) | 118 mm | 69% | 10°C (50°F) | fair |
| April | 18°C (64°F) | 9°C (47°F) | 146 mm | 67% | 15°C (60°F) | best |
| May | 23°C (73°F) | 14°C (57°F) | 164 mm | 68% | 20°C (67°F) | best |
| June | 26°C (79°F) | 18°C (65°F) | 198 mm | 79% | 24°C (75°F) | fair |
| July | 29°C (85°F) | 23°C (73°F) | 225 mm | 77% | 29°C (85°F) | fair |
| August | 30°C (87°F) | 24°C (75°F) | 161 mm | 67% | 31°C (87°F) | best |
| September | 27°C (81°F) | 20°C (69°F) | 215 mm | 71% | 29°C (84°F) | fair |
| October | 22°C (72°F) | 14°C (58°F) | 189 mm | 65% | 24°C (75°F) | best |
| November | 16°C (62°F) | 8°C (47°F) | 90 mm | 64% | 18°C (64°F) | best |
| December | 11°C (51°F) | 3°C (37°F) | 81 mm | 72% | 12°C (54°F) | fair |
Sources: 2001–2025 monthly averages from NASA POWER (MERRA-2 reanalysis), sea temperature from Open-Meteo Marine. Page updated . How we rate months
Weather across Aichi in September
Weather can differ a lot within Aichi: coasts, hills and mountains each have their own climate.
| Place | High | Low | Rain | Weather |
|---|---|---|---|---|
| Nagoya | 27°C (81°F) | 20°C (69°F) | 215 mm | fair |
| Toyota | 27°C (81°F) | 20°C (69°F) | 215 mm | fair |
| Okazaki | 27°C (81°F) | 20°C (69°F) | 215 mm | fair |
| Ichinomiya | 26°C (79°F) | 17°C (63°F) | 204 mm | best |
| Toyohashi | 26°C (79°F) | 18°C (64°F) | 216 mm | fair |
| Kasugai | 27°C (81°F) | 20°C (69°F) | 215 mm | fair |
| Anjō | 27°C (81°F) | 20°C (69°F) | 215 mm | fair |
| Toyokawa | 26°C (79°F) | 18°C (64°F) | 216 mm | fair |
| Nishio | 27°C (81°F) | 20°C (69°F) | 215 mm | fair |
| Kariya | 27°C (81°F) | 20°C (69°F) | 215 mm | fair |
| Komaki | 26°C (79°F) | 17°C (63°F) | 204 mm | best |
| Inazawa | 26°C (79°F) | 17°C (63°F) | 204 mm | best |