Hamilton
Canada
Long-term weather forecast
Long-term weather forecast

September weather forecast and climate
Hamilton, Canada

A bird
A bird's eye view of the Central Business District of Hamilton City in Canada, a view of the road network, and intense cloudy sky seen
September, the first month of the autumn, in Hamilton, is also an agreeable month, with temperature in the range of an average low of 11.4°C (52.5°F) and an average high of 21.1°C (70°F).

Temperature

In Hamilton, the average high-temperature marginally drops, from a warm 25.9°C (78.6°F) in August, to a pleasant 21.1°C (70°F). In Hamilton, the average low-temperature is 11.4°C (52.5°F).

Rainfall

In Hamilton, in September, during 12.3 rainfall days, 80.9mm (3.2") of precipitation is typically accumulated. In Hamilton, during the entire year, the rain falls for 121.1 days and collects up to 780.3mm (30.7") of precipitation.

Snowfall

Throughout the year, 1181mm (46.5") of snow is accumulated.

Sea temperature

In Hamilton, Canada, the average water temperature is 21.1°C (70°F).
Note: For swimming, a surface water temperature of 21.1°C (70°F) is not enjoyable for the majority. It is not considered safe, as controlling breathing becomes progressively more difficult as water temperature decreases below 21°C (69.8°F).

Daylight

In September, the average length of the day in Hamilton is 12.5h.

Sunshine

The average sunshine in September is 5.9h.

UV index

The average daily maximum UV index in September is 6. A UV Index of 6 to 7 symbolizes a high health vulnerability from the exposure to the Sun's UV rays for average individuals.
Note: In September, the average maximum UV index of 6 translate into the following recommendations:
Take precautions against overexposure. Protection against sun damage is needed. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The reflection of water and sand dramatically increases exposure to the UV rays.

What is the temperature in September in Hamilton?

In September, in Hamilton, the average high-temperature is 21.1°C (70°F), and the average low-temperature is 11.4°C (52.5°F).

How many days does it rain in September in Hamilton?

In Hamilton, Canada, in September, during 12.3 rainfall days, 80.9mm (3.2") of precipitation is typically accumulated.

What is the sea temperature in September in Hamilton?

In Hamilton, the average seawater temperature in September is 21.1°C (70°F). For most, swimming in 21.1°C (70°F) is not an enjoyable activity. Furthermore, controlling your breathing becomes progressively more difficult as the water temperature decreases from 21°C (69.8°F) to 15°C (59°F).

What is the average length of the day in September in Hamilton?

In September, the average length of the day is 12.5h.

How long on average sun shines in September in Hamilton?

The average sunshine in September in Hamilton, Canada, is 5.9h.

What is the UV index intensity in September in Hamilton?

In Hamilton, Canada, the average daily maximum UV index in September is 6. A UV Index reading of 6 to 7 represents a high health vulnerability from the exposure to the Sun's UV radiation.
Average temperature in September - Hamilton, Canada
  • Average high temperature in September: 21.1°C

The warmest month (with the highest average high temperature) is July (27.3°C).
The month with the lowest average high temperature is January (-0.9°C).

  • Average low temperature in September: 11.4°C

The month with the highest average low temperature is July (16.7°C).
The coldest month (with the lowest average low temperature) is January (-8.5°C).

Average rainfall in September - Hamilton, Canada
  • Average rainfall in September: 80.9mm

The wettest month (with the highest rainfall) is August (89.7mm).
The driest month (with the lowest rainfall) is February (26.4mm).

Average rainfall days in September - Hamilton, Canada
  • Average rainfall days in September: 12.3 days

The month with the highest number of rainy days is November (12.8 days).
The month with the lowest number of rainy days is February (5 days).

Average snowfall in September - Hamilton, Canada
  • Average snowfall in September: 0mm

The month with the highest snowfall is January (324mm).
Months with the lowest snowfall are May, 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 (10.5 days).
Months with the lowest number of snowfall days are May, June, July, August, September and October (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: 12.5h

The month with the longest days is June (Average daylight: 15.3h).
The month with shortest days is December (Average daylight: 9h).

  • Average sunshine in September: 5.9h

The month with most sunshine is July (Average sunshine: 9.8h).
The month with least sunshine is December (Average sunshine: 2.3h).

Average UV index in September - Hamilton, Canada
  • Average UV index in September: 6

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).