September weather forecastRoto, Cook Islands
September
Weather in September
September weather in Roto marks a change in wind and precipitation patterns. While the amount of rainfall increases slightly to 78mm (3.07"), wind gusts slightly decrease to 34.9km/h (21.7mph) from the previous high. September also boasts the highest daylight hours for the second half of the year, reaching 12.1 hours. The weather is quite stable during this period, with temperature ranges remaining relatively constant. Visibility continues at 10km (6.2mi), indicating a stable and clear weather pattern.Temperature
Roto experiences its lowest average temperatures in September, reaching a peak of 27.8°C (82°F) and a minimum of 27.1°C (80.8°F).Heat index
For September, the heat index is estimated at a tropical 31°C (87.8°F). Exhaustion becomes probable with enduring exposure and activity, potentially causing heat cramps.For clarity, heat index numbers account for light winds and areas under shade. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'real feel', quantifies the warmth felt when relative humidity is considered. The individual's impression of temperature can be shaped by additional aspects such as metabolic variations, physical activity, and clothing. When you're directly under the sun's rays, remember that the heat index may surge by 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young children are generally more endangered than adults, as they usually less sweat. And also, due to larger skin surface relative to their small bodies and higher heat production as a result of their activity.
Humidity
June through September, with an average relative humidity of 77%, are the most humid months in Roto.Rainfall
The month with the least rainfall is September, when the rain falls for 21.6 days and typically collects 78mm (3.07") of precipitation.Daylight
In Roto, the average length of the day in September is 12h and 3min.On the first day of September in Roto, sunrise is at 07:05 and sunset at 19:00. On the last day of the month, sunrise is at 06:46 and sunset at 18:58 -10.
Sunshine
The month with the most sunshine in Roto is September, with an average of 8.5h of sunshine.UV index
January through December, with an average maximum UV index of 7, are months with the highest UV index. The months with the lowest UV index are January through December, with an average maximum UV index of 7. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: In September, the maximum UV index of 7 suggests these recommendations:
Resist extreme sun exposure. Guarding against solar damage is essential. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a period when UV radiation is particularly strong, noting that parasols or canopies may not offer total sun protection. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Roto, Cook Islands
- Average high temperature in September: 27.8°C
The warmest months (with the highest average high temperature) are March, April and May (29°C).
The month with the lowest average high temperature is September (27.8°C).
- Average low temperature in September: 27.1°C
The month with the highest average low temperature is April (28.3°C).
The coldest month (with the lowest average low temperature) is August (27°C).
Average pressure in September
Roto, Cook Islands
- Average pressure in September: 1011.5mbar
The months with the highest atmospheric pressure are August and September (1011.5mbar).
The month with the lowest atmospheric pressure is January (1008.1mbar).
Average wind speed in September
Roto, Cook Islands
- Average wind speed in September: 25km/h
The windiest month (with the highest average wind speed) is August (26km/h).
The calmest month (with the lowest average wind speed) is April (17.4km/h).
Average humidity in September
Roto, Cook Islands
- Average humidity in September: 77%
The months with the highest relative humidity are June, July, August and September (77%).
The month with the lowest relative humidity is December (74%).
Average rainfall in September
Roto, Cook Islands
- Average rainfall in September: 78mm
The wettest month (with the highest rainfall) is January (268mm).
The driest month (with the least rainfall) is September (78mm).
Average rainfall days in September
Roto, Cook Islands
- Average rainfall days in September: 21.6 days
The month with the highest number of rainy days is March (28.7 days).
The month with the least rainy days is September (21.6 days).
Average daylight in September /
Average sunshine in September
Roto, Cook Islands
- Average daylight in September: 12h and 6min
The month with the longest days is December (Average daylight: 12h and 48min).
The month with the shortest days is June (Average daylight: 11h and 30min).
- Average sunshine in September: 8h and 30min
The month with the most sunshine is September (Average sunshine: 8h and 30min).
The month with the least sunshine is January (Average sunshine: 7h and 36min).
Average sunshine days in September
Roto, Cook Islands
- Average sunshine days in September: 5.6 days
The month with the most sunshine days is September (5.6 days).
The month with the least sunshine days is February (0.4 days).
Average UV index in September
Roto, Cook Islands
- Average UV index in September: 7
The months with the highest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, September, October, November and December (UV index 7).
Average cloud cover in September
Roto, Cook Islands
- Average cloud cover in September: 41
The month with the most cloud cover is January (Cloud cover 47).
The months with the least cloud cover are May and September (Cloud cover 41).
Average visibility in September
Roto, Cook Islands
- Average visibility in September: 10km
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (10km).
The months with the lowest visibility are January and February (9km).
