Okayama Weather in September
September in Okayama brings high temperatures around 29°C (84°F) during the day, dropping to 21°C (70°F) at night, with quite a bit of rainfall expected, averaging around 175 mm (6.9 in) for the month.
Rainfall in Okayama in September
Looking at the last 30 years, the data shows about 17 days with rain, averaging 175 mm (6.9 in) for the month. Wet weather is a regular and significant part of this month. Frequent days of rain combined with high totals means proper waterproofs are worth packing.
Temperature in Okayama in September
In September, expect high temperatures in Okayama, with highs of 29°C (84°F) and lows of 21°C (70°F) at night. This gives the month a fairly typical daily rhythm, with warmer afternoons and more comfortable nights. At 21°C (70°F) overnight, nights are warm enough to sit outside comfortably in light clothing.
Sunshine in Okayama in September
You can expect a moderate amount of sunlight, with approximately 159 hours. This means a pleasant mix of sun and overcast.If you're a fan of comfortable temperatures and drier conditions, September is a great time to visit.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Okayama's climate page.
Okayama Temperature in September
Min Temperature
21°C (70°F)
Max Temperature
29°C (84°F)
Chance of Rain
56%
Precipitation
175 mm (6.9 in)
Rainy days
17 days
Humidity
71%
Sunshine
159 hours
Percentage Sunshine
Daily Historical Temperatures
50-year average (1976-2025)
Based on our historical records, temperatures in Okayama typically drop from around 30°C (86°F) at the start of September to approximately 25°C (77°F) by the end. Nights are warm, with lows typically ranging from 18°C (64°F) to 23°C (73°F).
Average temperatures in September
Daily Historical Precipitation
50-year average (1976-2025)
Average daily rainfall for each day of the month based on long-term records.
Average precipitation in September
Historical weather for Okayama in September
Browse day-by-day weather records for Okayama spanning 51 years. Select any month and year to see actual temperatures, rainfall, and conditions recorded on each day.
Okayama historical weather extremes in September
Based on 49 years of weather observations in Okayama between 1976 and 2025, these are the recorded extremes.
- Okayama recorded its highest September temperature of 36°C (97°F) on September 3, 2020.
- The lowest daytime temperature in September was 17°C (63°F), recorded on September 29, 2008.
- Okayama registered its coldest September night on September 28, 1992, with temperatures dropping to 9°C (48°F).
Best Places in Japan in September
Find out more about the weather in Japan and which places have the best travel conditions in this month. See all of Japan in September →
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What to Wear in Okayama in September
Warm weather calls for comfortable, breathable clothing in September. Cotton t-shirts, shorts, light dresses, and sandals are perfect. You might still want a light layer for evenings or air-conditioned places (for example buses). Also bring a poncho, it will rain a lot! Waterproof everything you can. It won't hurt to bring your sunglasses along, as you'll see some sunny periods.What To Do in Okayama in September
We rated the following activities from 1 (least suitable) to 10 (best) to do.
Check the conditions for any month of the year.
For a detailed overview over the year and the best time to visit Japan, check out our Okayama's climate page.
Temperature Rainfall Sunshine Humidity
See the full Okayama climate overview or explore weather in Japan.
