Climate Overview
The climate in Arno is hot. The average annual temperature is 27°C and approximately 3329mm of precipitation falls per year. Arno receives a notable amount of rainfall throughout the year, including during its driest month. Arno sits near the equator, so seasonal temperature differences are minimal throughout the year.
Temperature
Arno has relatively stable temperatures year-round, staying within a 2°C range. The warmest month is September, when average highs reach 28°C and the mean temperature sits around 27°C. September is the coolest month, with minimum temperatures around 26°C and an average of 27°C. Daily temperature variation is modest, with an average difference of 2°C between highs and lows.
Precipitation
Arno is a very wet location, receiving approximately 3329mm of precipitation annually, which averages out to around 277mm per month. The wettest month is December, averaging 398mm of rainfall. October and May also tend to see above-average precipitation. The driest month is February, with just 156mm. That's 242mm less than December, the wettest month. Precipitation varies noticeably between seasons, with the second half (July to December) of the year generally seeing more rainfall.
Wind
Arno is relatively calm, with an average annual wind speed of 6km/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 9km/h, though still comfortable for most outdoor activities. The calmest conditions occur in October, with average winds dropping to 4km/h, making it an ideal period for wind-sensitive activities. Wind speeds vary significantly across the year, with a 5km/h difference between the calmest and windiest months. This level of variation is worth factoring into travel plans. Wind tends to be stronger during winter months, driven by seasonal pressure systems. The seasonal averages break down to 8km/h in winter, 8km/h in spring, 5km/h in summer, 5km/h in autumn.
Seasons
93 days until Autumn
It is currently summer in Arno, which began on June 21, 2026. Arno sits near the equator, so the traditional four-season cycle is less pronounced — temperatures remain relatively stable year-round. The warmest period peaks in September at around 28°C, while the coldest stretch bottoms out in September near 26°C. Autumn is next, beginning on September 23, 2026 — 93 days from now.
Spring
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 742mm across the season with a monthly average of 247mm. Winds are generally light, averaging 8km/h. An umbrella or waterproof jacket is advisable as spring showers are frequent.
Summer
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 860mm across the season with a monthly average of 287mm. Winds are generally light, averaging 5km/h. Light, breathable clothing is ideal — perfect conditions for outdoor activities.
Autumn
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 939mm across the season with a monthly average of 313mm. Winds are generally light, averaging 5km/h. A waterproof jacket and sturdy footwear are recommended as rain becomes more frequent.
Winter
Temperatures range from 26 to 28°C. Rainfall is heavy, totalling around 789mm across the season with a monthly average of 263mm. Winds are generally light, averaging 8km/h. A light jacket or sweater is usually sufficient, though cooler evenings may call for an extra layer.
Monthly Climate Data
The table below shows monthly climate averages for Arno 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.
