September weather forecastHamilton, Canada
September
Weather in September
September brings a whiff of autumn as Hamilton's weather begins its transition from summer's end. The highest temperature recorded recedes to 21.4°C (70.5°F), offering relief from summer heat. The fall foliage starts to make its appearance, providing a stark contrast to the receding greenery. Crisp mornings and chilly evenings prompt residents to pack away their summer outfits. September concludes, giving a colourful curtain call to summer, and gently ushering in the new season.Temperature
The shift from August to September in Hamilton coincides with a small decrease in the average high-temperature, down to a pleasant 21.4°C (70.5°F) from a moderately hot 24.7°C (76.5°F). Hamilton experiences a steady low-temperature of 13.7°C (56.7°F) throughout September.Humidity
In September, the average relative humidity in Hamilton, Canada, is 76%.Rainfall
September is the month with the least rainfall. Rain falls for 14.1 days and accumulates 44mm (1.73") of precipitation.Snowfall
In Hamilton, snow does not fall in June through October.Sea temperature
In Hamilton, Canada, in September, the average water temperature is 21.1°C (70°F).Note: For most individuals, swimming in 21.1°C (70°F) is not a pleasurable activity. Breathing becomes progressively more difficult as water temperature declines below 21°C (69.8°F).
Daylight
The average length of the day in September is 12h and 29min.On the first day of September in Hamilton, sunrise is at 6:44 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 7:01 pm EDT.
Sunshine
In September, the average sunshine in Hamilton is 9.3h.UV index
In Hamilton, Canada, the average daily maximum UV index in September is 4. A UV Index of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for average individuals.Note: In September, the maximum UV index of 4 transforms into these recommendations:
Put precautions into practice - Guidance to elude sunburn is provided. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. Be mindful! Sand and water reflections can up the Sun's UV exposure.
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in September
Hamilton, Canada
- Average high temperature in September: 21.4°C
The warmest month (with the highest average high temperature) is July (25.4°C).
The month with the lowest average high temperature is January (-2.3°C).
- Average low temperature in September: 13.7°C
The month with the highest average low temperature is July (17.3°C).
The coldest month (with the lowest average low temperature) is January (-7.3°C).
Average pressure in September
Hamilton, Canada
- Average pressure in September: 1017.1mbar
The months with the highest atmospheric pressure are March and November (1018.5mbar).
The month with the lowest atmospheric pressure is June (1013.3mbar).
Average wind speed in September
Hamilton, Canada
- Average wind speed in September: 12.7km/h
The windiest month (with the highest average wind speed) is January (19km/h).
The calmest month (with the lowest average wind speed) is July (11.3km/h).
Average humidity in September
Hamilton, Canada
- Average humidity in September: 76%
The month with the highest relative humidity is February (85%).
The month with the lowest relative humidity is April (75%).
Average rainfall in September
Hamilton, Canada
- Average rainfall in September: 44mm
The wettest month (with the highest rainfall) is July (74mm).
The driest month (with the least rainfall) is September (44mm).
Average rainfall days in September
Hamilton, Canada
- Average rainfall days in September: 14.1 days
The month with the highest number of rainy days is July (19.2 days).
The month with the least rainy days is February (9.3 days).
Average snowfall in September
Hamilton, Canada
- Average snowfall in September: 0mm
The month with the highest snowfall is February (137mm).
The months with the least snowfall are June, July, August, September and October (0mm).
Average snowfall days in September
Hamilton, Canada
- Average snowfall days in September: 0 days
The month with the highest number of snowfall days is January (14.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature in September
Hamilton, Canada
- Average sea temperature in September: 21.1°C
The best month for swimming (with the highest average sea temperature) is August (23.4°C).
The coldest month (with the lowest average sea temperature) is February (1.2°C).
Average daylight in September /
Average sunshine in September
Hamilton, Canada
- Average daylight in September: 12h and 30min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 0min).
- Average sunshine in September: 9h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).
Average sunshine days in September
Hamilton, Canada
- Average sunshine days in September: 13.8 days
The month with the most sunshine days is September (13.8 days).
The month with the least sunshine days is February (9 days).
Average UV index in September
Hamilton, Canada
- Average UV index in September: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in September
Hamilton, Canada
- Average cloud cover in September: 30
The month with the most cloud cover is January (Cloud cover 66).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in September
Hamilton, Canada
- Average visibility in September: 9km
The month with the highest visibility is August (10km).
The month with the lowest visibility is January (8km).
