September weather forecast
Hamilton, Canada

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The Central Business District of Hamilton City in Canada
The Central Business District of Hamilton City in Canada

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.

Frequently asked questions

What are September temperatures in Hamilton?

In September, in Hamilton, the average high-temperature is 21.4°C (70.5°F), and the average low-temperature is 13.7°C (56.7°F).

What is the average humidity in September in Hamilton?

In Hamilton, Canada, the average relative humidity in September is 76%.

What is the driest month in Hamilton?

The month with the least rainfall is September, when the rain falls for 14.1 days and typically collects 44mm (1.73") of precipitation.

How much does it rain in Hamilton in September?

In Hamilton, in September, it is raining for 14.1 days, with typically 44mm (1.73") of accumulated precipitation.

When it does not snow in Hamilton?

June through October are months without snowfall in Hamilton.

What is the sea water temperature in September in Hamilton?

In Hamilton, Canada, in September, the average water temperature is 21.1°C (70°F). 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).

How many hours of daylight does Hamilton have in September?

In Hamilton, the average day length in September is 12h and 29min.

What time are sunrise and sunset in September in Hamilton?

On the first day of September, 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.

How many hours of sunshine does Hamilton have in September?

In Hamilton, Canada, the average sunshine duration in September is 9.3h.

What is the UV index reading in September in Hamilton?

In Hamilton, Canada, the average daily maximum UV index in September is 4. A UV Index reading of 3 to 5 represents a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover

Average temperature in September
Hamilton, Canada

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in September - Hamilton, Canada
  • Average daylight in September: 12h and 3min

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 2min

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 - 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 - 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 - 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 - 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).

Hamilton, Canada

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