Oshawa, Ontario Weather by Month and Climate Averages

How much rain does Oshawa get?

Oshawa gets 724 mm of precipitation in an average year, spread over about 121 days with measurable rain. That is more rainy days than 51% of Canada.

June is the wettest month, with 82 mm. February is the driest, with 37 mm. October has the most rainy days, about 13.

The longest dry spell in the last five years lasted 17 days, to June 10, 2023.

Oshawa weather by month

Oshawa weather in January

In January, Oshawa averages a high of -1°C and a low of -9°C. It gets 51 mm of precipitation over about 10 rainy days. The sun is out about 23% of daylight hours. The January record high is 12°C (2013) and the record low is -27°C (2018).

Oshawa weather in February

In February, Oshawa averages a high of -1°C and a low of -10°C. It gets 37 mm of precipitation over about 8 rainy days. The sun is out about 32% of daylight hours. The February record high is 18°C (2017) and the record low is -28°C (2023).

Oshawa weather in March

In March, Oshawa averages a high of 4°C and a low of -5°C. It gets 49 mm of precipitation over about 10 rainy days. The sun is out about 34% of daylight hours. The March record high is 23°C (2012) and the record low is -25°C (2015).

Oshawa weather in April

In April, Oshawa averages a high of 11°C and a low of 1°C. It gets 82 mm of precipitation over about 12 rainy days. The sun is out about 35% of daylight hours. The April record high is 27°C (2023) and the record low is -10°C (2016).

Oshawa weather in May

In May, Oshawa averages a high of 18°C and a low of 7°C. It gets 61 mm of precipitation over about 11 rainy days. The sun is out about 44% of daylight hours. The May record high is 31°C (2020) and the record low is -4°C (2020). May is one of the most comfortable months to visit.

Oshawa weather in June

In June, Oshawa averages a high of 24°C and a low of 13°C. It gets 82 mm of precipitation over about 10 rainy days. The sun is out about 45% of daylight hours. The June record high is 32°C (2012) and the record low is 2°C (2019).

Oshawa weather in July

In July, Oshawa averages a high of 27°C and a low of 16°C. It gets 61 mm of precipitation over about 9 rainy days. The sun is out about 48% of daylight hours. The July record high is 37°C (2011) and the record low is 8°C (2014).

Oshawa weather in August

In August, Oshawa averages a high of 26°C and a low of 14°C. It gets 70 mm of precipitation over about 9 rainy days. The sun is out about 46% of daylight hours. The August record high is 33°C (2016) and the record low is 7°C (2013). August is one of the most comfortable months to visit.

Oshawa weather in September

In September, Oshawa averages a high of 22°C and a low of 11°C. It gets 62 mm of precipitation over about 9 rainy days. The sun is out about 49% of daylight hours. The September record high is 32°C (2018) and the record low is 0°C (2020). September is one of the most comfortable months to visit.

Oshawa weather in October

In October, Oshawa averages a high of 14°C and a low of 4°C. It gets 74 mm of precipitation over about 13 rainy days. The sun is out about 39% of daylight hours. The October record high is 28°C (2019) and the record low is -7°C (2020).

Oshawa weather in November

In November, Oshawa averages a high of 7°C and a low of -2°C. It gets 45 mm of precipitation over about 10 rainy days. The sun is out about 37% of daylight hours. The November record high is 23°C (2022) and the record low is -17°C (2019).

Oshawa weather in December

In December, Oshawa averages a high of 2°C and a low of -6°C. It gets 50 mm of precipitation over about 12 rainy days. The sun is out about 21% of daylight hours. The December record high is 15°C (2021) and the record low is -27°C (2017).

Sunshine, humidity and wind in Oshawa

September is the sunniest month in Oshawa, with sunshine about 49% of daylight hours. December is the cloudiest, at 21%. Over the year the sun shines about 38% of daylight hours. Oshawa is sunnier than 64% of Canada.

Humidity peaks in December at 79% and is lowest in May at 60%.

Oshawa weather records

The hottest temperature on record at the Oshawa station is 37°C, on July 21, 2011. The coldest is -28°C, on February 4, 2023.

The wettest day on record brought 59 mm of rain, on October 28, 2015.

The best time to visit Oshawa

The most comfortable time to visit is typically May and August to September, when daytime highs sit near 22°C.

Winter (December–February) is cold, with average highs around 0°C and lows near -8°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 14°C. It can feel humid.

Autumn (September–November) is mild, with average highs around 14°C and lows near 5°C.

Oshawa climate questions

How much rain does Oshawa get?

Oshawa gets 724 mm of precipitation in an average year, over about 121 rainy days.

What is the wettest month in Oshawa?

June is the wettest month in Oshawa, with 82 mm. February is the driest, with 37 mm.

How many rainy days does Oshawa have a year?

Oshawa has about 121 days with measurable rain in an average year. October has the most, about 13.

What is the hottest month in Oshawa?

July is the warmest month in Oshawa, with an average high of 27°C.

What is the coldest month in Oshawa?

February is the coldest month in Oshawa, with an average low of -10°C.

What is the record high temperature in Oshawa?

The record high at the Oshawa station is 37°C, set on July 21, 2011. The record low is -28°C, on February 4, 2023.

What is the sunniest month in Oshawa?

September is the sunniest month in Oshawa, with sunshine about 49% of daylight hours. December is the cloudiest.

What is the best time to visit Oshawa?

The most comfortable time to visit is typically May and August to September, when daytime highs sit near 22°C.