Guelph, Ontario Weather by Month and Climate Averages

Guelph weather by month

Guelph weather in January

In January, Guelph averages a high of -2°C and a low of -11°C. The sun is out about 16% of daylight hours. The January record high is 14°C (2008) and the record low is -31°C (2022).

Guelph weather in February

In February, Guelph averages a high of -2°C and a low of -12°C. The sun is out about 30% of daylight hours. The February record high is 16°C (2017) and the record low is -33°C (2015).

Guelph weather in March

In March, Guelph averages a high of 4°C and a low of -7°C. The sun is out about 32% of daylight hours. The March record high is 27°C (2012) and the record low is -26°C (2015).

Guelph weather in April

In April, Guelph averages a high of 11°C and a low of -1°C. The sun is out about 35% of daylight hours. The April record high is 27°C (2009) and the record low is -17°C (2016).

Guelph weather in May

In May, Guelph averages a high of 19°C and a low of 6°C. The sun is out about 42% of daylight hours. The May record high is 32°C (2012) and the record low is -6°C (2020). May is one of the most comfortable months to visit.

Guelph weather in June

In June, Guelph averages a high of 24°C and a low of 11°C. The sun is out about 47% of daylight hours. The June record high is 33°C (2018) and the record low is 2°C (2020). June is one of the most comfortable months to visit.

Guelph weather in July

In July, Guelph averages a high of 26°C and a low of 13°C. The sun is out about 49% of daylight hours. The July record high is 34°C (2020) and the record low is 4°C (2007). July is one of the most comfortable months to visit.

Guelph weather in August

In August, Guelph averages a high of 25°C and a low of 12°C. The sun is out about 47% of daylight hours. The August record high is 34°C (2007) and the record low is 2°C (2009). August is one of the most comfortable months to visit.

Guelph weather in September

In September, Guelph averages a high of 22°C and a low of 8°C. The sun is out about 50% of daylight hours. The September record high is 34°C (2007) and the record low is -2°C (2020). September is one of the most comfortable months to visit.

Guelph weather in October

In October, Guelph averages a high of 14°C and a low of 3°C. The sun is out about 37% of daylight hours. The October record high is 29°C (2019) and the record low is -9°C (2020).

Guelph weather in November

In November, Guelph averages a high of 7°C and a low of -2°C. The sun is out about 34% of daylight hours. The November record high is 23°C (2020) and the record low is -19°C (2018).

Guelph weather in December

In December, Guelph averages a high of 1°C and a low of -6°C. The sun is out about 16% of daylight hours. The December record high is 16°C (2021) and the record low is -29°C (2017).

Sunshine, humidity and wind in Guelph

September is the sunniest month in Guelph, with sunshine about 50% of daylight hours. January is the cloudiest, at 16%. Over the year the sun shines about 36% of daylight hours. Guelph is sunnier than 51% of Canada.

Humidity peaks in January at 81% and is lowest in May at 60%.

Guelph has about 3 days a year above 32°C. Guelph is cooler than 66% of Canada.

First and last freeze in Guelph

The first fall freeze in Guelph typically comes around October 10, and the last spring freeze around May 16. That leaves a frost-free growing season of about 147 days.

Guelph weather records

The hottest temperature on record at the Guelph station is 34°C, on July 21, 2011. The coldest is -33°C, on February 16, 2015.

The wettest day on record brought 64 mm of rain, on January 11, 2020.

The best time to visit Guelph

The most comfortable time to visit is typically May to September, when daytime highs sit near 23°C.

Winter (December–February) is cold, with average highs around -1°C and lows near -9°C.

Spring (March–May) is chilly, with average highs around 11°C and lows near -1°C.

Summer (June–August) is warm, with average highs around 25°C and lows near 12°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 14°C and lows near 3°C.

Guelph climate questions

What is the hottest month in Guelph?

July is the warmest month in Guelph, with an average high of 26°C.

What is the coldest month in Guelph?

February is the coldest month in Guelph, with an average low of -12°C.

What is the record high temperature in Guelph?

The record high at the Guelph station is 34°C, set on July 21, 2011. The record low is -33°C, on February 16, 2015.

What is the sunniest month in Guelph?

September is the sunniest month in Guelph, with sunshine about 50% of daylight hours. January is the cloudiest.

When is the first frost in Guelph?

The first fall freeze in Guelph typically comes around October 10. The last spring freeze is around May 16.

What is the best time to visit Guelph?

The most comfortable time to visit is typically May to September, when daytime highs sit near 23°C.