Climate Insights for Isahaya

The climate in Isahaya is temperate. The average annual temperature is 18°C and approximately 2274mm of precipitation falls per year. Isahaya receives a notable amount of rainfall throughout the year, including during its driest month. Isahaya is in the Northern Hemisphere. Summer begins at the end of June and lasts through September. The summer months are: August, July, September. The coldest months are February, January, December, when temperatures can drop to 7°C.

Temperatures in Isahaya vary considerably across the year, with a 22°C difference between the coldest and warmest months. The warmest month is August, when average highs reach 29°C and the mean temperature sits around 28°C. February is the coolest month, with minimum temperatures around 7°C and an average of 9°C. Daily temperature variation is modest, with an average difference of 3°C between highs and lows. The sharpest temperature change occurs between November and December, with a 5°C shift in average temperatures.

Isahaya is a very wet location, receiving approximately 2274mm of precipitation annually, which averages out to around 189mm per month. The wettest month is July, averaging 421mm of rainfall. June and September also tend to see above-average precipitation. The driest month is November, with just 87mm. That's 334mm less than July, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.

Isahaya is relatively calm, with an average annual wind speed of 5km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is February, averaging 6km/h, though still comfortable for most outdoor activities. The calmest conditions occur in June, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 2km/h gap between the calmest and windiest months.

It is currently summer in Isahaya, which began on June 21, 2026. Isahaya is in the Northern Hemisphere, where spring begins in March, summer in June, autumn in September, and winter in December. The warmest period peaks in August at around 29°C, while the coldest stretch bottoms out in February near 7°C. Autumn is next, beginning on September 23, 2026 — 92 days from now.

The best time to visit Isahaya is during November, when the weather is most comfortable for travellers. During these months, average temperatures hover around 16°C with modest rainfall averaging 87mm per month. By contrast, August can be uncomfortably hot with highs reaching 29°C, while February is the coldest period with lows dropping to 7°C. Despite being the best months overall, some rain is still likely — pack a waterproof layer and plan a mix of indoor and outdoor activities.

The table below shows monthly climate averages for Isahaya based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.