Thunder Bay weather

Usually in March
- -0
- -12
- 5
Weather by month
Now Today
- 4
- 10
5-day forecast

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Recommended for Ontario

The weather guide for Ontario (Thunder Bay) shows long term weather averages processed from data supplied by CRU (University of East Anglia) & today's weather forecast provided by meteoblue. Find out more about our data sources.

Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec

When is the best time to go to Thunder Bay?

The best time to go to Thunder Bay is July based on the following average weather conditions.

Maximum daytime temperature = 22 - 30°C [remove]
Daily hours of sunshine = 10 hours or more [remove]

Change the criteria to reflect your weather preferences.

0.5
Jan
1
Feb
1
Mar
1.5
Apr
2
May
4
Jun
5
Jul
4
Aug
1.5
Sep
0.5
Oct
0
Nov
0
Dec

Change criteria

Max Day Temperature (°C)

-9
Jan
-6
Feb
0
Mar
8
Apr
15
May
20
Jun
24
Jul
22
Aug
17
Sep
10
Oct
2
Nov
-6
Dec

Hours of Sunshine (daily)

4
Jan
5
Feb
5
Mar
7
Apr
8
May
9
Jun
10
Jul
8
Aug
5
Sep
4
Oct
3
Nov
3
Dec

Best time to go for the weather

Destination

Daytime temperature

Sunshine hours

Sea temperature

Monthly rainfall

Days with some rain

Heat & humidity

Metric (°C / mm) | Imperial (°F / inches)

More about Canada

Which is the hottest month in Thunder Bay?

The hottest time of year in Thunder Bay is normally July. Expect maximum daytime temperatures to reach 24°C.

Which month has the most rain in Thunder Bay?

In terms of rainfall, August is usually the wettest month in Thunder Bay with 88mm on average. There are normally 13 days in August with some rain.

When is it sunniest in Thunder Bay?

The sunniest time of year in Thunder Bay is normally July with bright sunshine on average for 61% of daylight hours; that's 10 hours of sunshine per day.

When is the sea warmest in Thunder Bay?

The sea is usually at its warmest in Thunder Bay in August when the water temperature reaches 13°C.

What is the flight time to Ontario from the UK?

The flight time to Ontario from the UK is typically 8 hours.

What is the time difference between Ontario and the UK?

The time difference between Ontario and the UK is GMT-5 to GMT-6 hours.

What is the main language spoken in Ontario?

The main languages spoken in Ontario are English and French.

Learn a language for Ontario with Busuu^*, Lingoda^* and Mondly^*.

What is the currency in Ontario?

The currency in Ontario is the Canadian Dollar (CAD).

Send money to Ontario with XE Money Transfers^*.

Which plugs are used in Ontario?

Ontario uses electrical plug type A + B (120 Volts).

Which side of the road do they drive on in Ontario?

They drive on the right side of the road in Ontario.

Do you need a visa for Ontario?

Yes, UK passport holders do need a visa to enter Ontario.

Check Canada visa requirements for all passport holders with VisaHQ^* and iVisa.com^*.

Compare Thunder Bay weather with the USA

Below the Thunder Bay weather chart shows average maximum daytime temperature for Thunder Bay, Ontario, Canada and the USA (Washington).

Maximum daytime temperature (°C)

Thunder Bay, Ontario, Canada

USA (Washington)

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

-9

-6