Climate and monthly weather forecastSarnia, Canada
Climate and monthly weather forecast
Weather in January
January, like December, is a freezing cold winter month in Sarnia, Canada, with an average temperature ranging between min -7.5°C (18.5°F) and max -2.3°C (27.9°F). Sarnia's coldest temperatures are experienced in January, with average high temperatures of -2.3°C (27.9°F) and lows of -7.5°C (18.5°F). Weather in January »Weather in February
February, the last month of the winter in Sarnia, is another freezing cold month, with an average temperature ranging between min -7.3°C (18.9°F) and max -1.1°C (30°F). In February, Sarnia notes an average high-temperature of a still subzero cold -1.1°C (30°F), hardly different from the preceding month. Weather in February »Weather in March
March, the first month of the spring in Sarnia, is a wintry month, with an average temperature varying between -2.4°C (27.7°F) and 4.2°C (39.6°F). With the onset of March, Sarnia's average high-temperature sees a rise, moving from February's subzero cold -1.1°C (30°F) to a wintry 4.2°C (39.6°F). Weather in March »Weather in April
April is a fresh spring month in Sarnia, Canada, with an average temperature fluctuating between 10.7°C (51.3°F) and 2.8°C (37°F). In Sarnia, the onset of April comes with an increased average high-temperature, moving from March's cold 4.2°C (39.6°F) to a cool 10.7°C (51.3°F). Weather in April »Weather in May
May, the last month of the spring in Sarnia, is a comfortable month, with an average temperature ranging between max 18°C (64.4°F) and min 8.8°C (47.8°F). With the onset of May, Sarnia sees a temperature rise, with the average high-temperature moving from April's cool 10.7°C (51.3°F) to an enjoyable 18°C (64.4°F). Weather in May »Weather in June
June, the first month of the summer in Sarnia, is an agreeable month, with an average temperature varying between 22.3°C (72.1°F) and 13.1°C (55.6°F). The onset of June marks a slight increase in the average high-temperature, moving from a comfortable 18°C (64.4°F) in May to a pleasant 22.3°C (72.1°F). Weather in June »Weather in July
July in Sarnia, Canada, is a warm summer month, with temperature in the range of an average low of 16.3°C (61.3°F) and an average high of 25.8°C (78.4°F). July proves to be the warmest month, recording an average peak temperature of 25.8°C (78.4°F) and a minimum temperature of 16.3°C (61.3°F). Weather in July »Weather in August
The last month of the summer, August, is another warm month in Sarnia, Canada, with temperature in the range of an average high of 25.3°C (77.5°F) and an average low of 16.1°C (61°F). The beginning of August reveals an average high-temperature of a still warm 25.3°C (77.5°F), showing minimal deviation from the previous month. Weather in August »Weather in September
September, the first month of the autumn in Sarnia, is also an agreeable month, with an average temperature fluctuating between 21.8°C (71.2°F) and 12.9°C (55.2°F). With the arrival of September, Sarnia experiences a modest decline in average high-temperatures, transitioning from a warm 25.3°C (77.5°F) in August to a pleasant 21.8°C (71.2°F). Weather in September »Weather in October
October, like September, is another mild autumn month in Sarnia, Canada, with temperature in the range of an average low of 7.8°C (46°F) and an average high of 14.6°C (58.3°F). The arrival of October corresponds with a reduction in the average high-temperature, down from September's agreeable 21.8°C (71.2°F) to a mild 14.6°C (58.3°F). Weather in October »Weather in November
November, the last month of the autumn in Sarnia, is another chilly month, with temperature in the range of an average low of 1.5°C (34.7°F) and an average high of 7.4°C (45.3°F). November comes with a drop in the average high-temperature, falling from October's mild 14.6°C (58.3°F) to a chilly 7.4°C (45.3°F). Weather in November »Weather in December
The first month of the winter, December, is still a cold month in Sarnia, Canada, with an average temperature varying between -3°C (26.6°F) and 1.5°C (34.7°F). With December's arrival, Sarnia sees a decrease in average high-temperatures, moving from a frosty 7.4°C (45.3°F) in November to a cold 1.5°C (34.7°F). Weather in December »Updated: Feb 5, 2024
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Published by: Weather Atlas | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
January stands out as Sarnia's coldest month, with temperatures ranging between an average high of -2.3°C (27.9°F) and a low of -7.5°C (18.5°F).
Throughout the year, in Sarnia, there are 140.4 rainfall days, and 493mm (19.41") of precipitation is accumulated.
Months with snowfall are January through May, October through December.
Throughout the year, in Sarnia, there are 55.2 snowfall days, and 312mm (12.28") of snow is accumulated.
With an average of 2.9h of sunshine, January has the least sunshine of the year in Sarnia.
January and December, with an average maximum UV index of 1, are months with the lowest UV index in Sarnia.
With an average relative humidity of 86%, February is the most humid month.
The month with the least rainfall in Sarnia, Canada, is February, when the rain falls for 5.7 days and typically collects 28mm (1.1") of precipitation.
The month with the most snowfall is February, when snow falls for 12.8 days and typically aggregates up to 99mm (3.9") of snow.
The months with the coldest seawater in Sarnia, Canada, are February and March, with an average sea temperature of 0.3°C (32.5°F).
On Sunday, 10. March 2024, at 2:00 am, Daylight Saving Time starts, and the time zone changes from EST to EDT. Daylight Saving Time ends on Sunday, 03. November 2024, at 2:00 am, and the time zone reverts from EDT to EST.
The months with the lowest humidity are April and May, with an average relative humidity of 76%.
May is the month with the most rainfall in Sarnia. Rain falls for 15.7 days and accumulates 54mm (2.13") of precipitation.
June through September are months without snowfall in Sarnia.
With an average of 15h and 18min of daylight, June has the longest days of the year in Sarnia.
In Sarnia, July records the average highest temperatures, peaking at 25.8°C (78.4°F) and reaching a low of 16.3°C (61.3°F).
The month with the most sunshine in Sarnia, Canada, is July, with an average of 10.3h of sunshine.
July and August, with an average maximum UV index of 6, are months with the highest UV index in Sarnia, Canada.
With an average sea temperature of 23.2°C (73.8°F), August is the month with the warmest seawater.
The month with the shortest days in Sarnia, Canada, is December, with an average of 9h and 6min of daylight.
Average temperature
Sarnia, Canada
The warmest month (with the highest average high temperature) is July (25.8°C).
The month with the lowest average high temperature is January (-2.3°C).
The month with the highest average low temperature is July (16.3°C).
The coldest month (with the lowest average low temperature) is January (-7.5°C).
Average pressure
Sarnia, Canada
- Average pressure in January:
1017.9mbar - Average pressure in February:
1017.9mbar - Average pressure in March:
1018.8mbar - Average pressure in April:
1014.8mbar - Average pressure in May:
1015.4mbar - Average pressure in June:
1013.5mbar
- Average pressure in July:
1014.4mbar - Average pressure in August:
1014.9mbar - Average pressure in September:
1017.1mbar - Average pressure in October:
1015.7mbar - Average pressure in November:
1018.7mbar - Average pressure in December:
1018.1mbar
The month with the highest atmospheric pressure is March (1018.8mbar).
The month with the lowest atmospheric pressure is June (1013.5mbar).
Average wind speed
Sarnia, Canada
- Average wind speed in January:
18.2km/h - Average wind speed in February:
17.7km/h - Average wind speed in March:
17km/h - Average wind speed in April:
17km/h - Average wind speed in May:
13.7km/h - Average wind speed in June:
12.4km/h
- Average wind speed in July:
11km/h - Average wind speed in August:
11.5km/h - Average wind speed in September:
12.7km/h - Average wind speed in October:
16.1km/h - Average wind speed in November:
17.1km/h - Average wind speed in December:
17.5km/h
The windiest month (with the highest average wind speed) is January (18.2km/h).
The calmest month (with the lowest average wind speed) is July (11km/h).
Average humidity
Sarnia, Canada
The month with the highest relative humidity is February (86%).
The months with the lowest relative humidity are April and May (76%).
Average rainfall
Sarnia, Canada
The wettest month (with the highest rainfall) is May (54mm).
The driest month (with the least rainfall) is February (28mm).
Average rainfall days
Sarnia, Canada
- Average rainfall days in January:
6.6 days - Average rainfall days in February:
5.7 days - Average rainfall days in March:
10 days - Average rainfall days in April:
14.7 days - Average rainfall days in May:
15.7 days - Average rainfall days in June:
13.7 days
- Average rainfall days in July:
14.9 days - Average rainfall days in August:
13.8 days - Average rainfall days in September:
12.4 days - Average rainfall days in October:
14.3 days - Average rainfall days in November:
9.4 days - Average rainfall days in December:
9.2 days
The month with the highest number of rainy days is May (15.7 days).
The month with the least rainy days is February (5.7 days).
Average snowfall
Sarnia, Canada
The month with the highest snowfall is February (99mm).
The months with the least snowfall are June, July, August and September (0mm).
Average snowfall days
Sarnia, Canada
- Average snowfall days in January:
14.4 days - Average snowfall days in February:
12.8 days - Average snowfall days in March:
8.2 days - Average snowfall days in April:
2.3 days - Average snowfall days in May:
0.3 days - Average snowfall days in June:
0 days
- Average snowfall days in July:
0 days - Average snowfall days in August:
0 days - Average snowfall days in September:
0 days - Average snowfall days in October:
0.3 days - Average snowfall days in November:
4.8 days - Average snowfall days in December:
12.1 days
The month with the highest number of snowfall days is January (14.4 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average sea temperature
Sarnia, Canada
The best month for swimming (with the highest average sea temperature) is August (23.2°C).
The coldest months (with the lowest average sea temperature) are February and March (0.3°C).
Average daylight / Average sunshine
Sarnia, Canada
- Average daylight in January:
9h and 24min - Average daylight in February:
10h and 36min - Average daylight in March:
12h and 0min - Average daylight in April:
13h and 24min - Average daylight in May:
14h and 42min - Average daylight in June:
15h and 18min
- Average daylight in July:
15h and 0min - Average daylight in August:
13h and 54min - Average daylight in September:
12h and 30min - Average daylight in October:
11h and 0min - Average daylight in November:
9h and 42min - Average daylight in December:
9h and 6min
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 6min).
- Average sunshine in January:
2h and 54min - Average sunshine in February:
3h and 36min - Average sunshine in March:
5h and 6min - Average sunshine in April:
7h and 6min - Average sunshine in May:
8h and 42min - Average sunshine in June:
9h and 54min
- Average sunshine in July:
10h and 18min - Average sunshine in August:
10h and 0min - Average sunshine in September:
8h and 12min - Average sunshine in October:
5h and 18min - Average sunshine in November:
4h and 24min - Average sunshine in December:
3h and 12min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).
Average sunshine days
Sarnia, Canada
- Average sunshine days in January:
12.1 days - Average sunshine days in February:
11.3 days - Average sunshine days in March:
14.8 days - Average sunshine days in April:
12.2 days - Average sunshine days in May:
12.9 days - Average sunshine days in June:
13.9 days
- Average sunshine days in July:
13.9 days - Average sunshine days in August:
13.7 days - Average sunshine days in September:
15 days - Average sunshine days in October:
13.9 days - Average sunshine days in November:
15.2 days - Average sunshine days in December:
12.5 days
The month with the most sunshine days is November (15.2 days).
The month with the least sunshine days is February (11.3 days).
Average UV index
Sarnia, Canada
The months with the highest UV index are July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover
Sarnia, Canada
The month with the most cloud cover is January (Cloud cover 70).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility
Sarnia, Canada
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (9km).
