Grimsby, Canada experiences average highs of 14°C (57°F) and lows of 7°C (45°F) throughout the year. Rainfall is moderate, averaging about 11 rainy days per month. Average highs have cooled by 0.8°C (1.4°F) across the available records.
Grimsby, Canada Weather & Climate 2026
Monthly climate averages for Grimsby, Canada. Based on 10-year ERA5 reanalysis data.
Climate Overview
Drier season: Jan–Nov 
Wetter season: Apr–Dec At-a-Glance Climate Summary
Live Weather & Air Quality
Key figures
Climate Score
5.2/10
Best: May, June, July, August, September
UV Index
4
Low
Temperature 14°C / 7°C
Feels Like 12°C / 5°C
Rainy Days 11
Rainfall 78 mm
Sunshine 8 h
Humidity 72%
Wind Speed 21 km/h
Dew Point 6°C
Snow Days 8 days
Frost Days 15 days
Hottest Month
27°C
July
Avg Low 20°C
Rain 12 days
Coldest Month
-4°C
January
Avg High 1°C
Rain 10 days
Driest Month
8 days
September
Avg High 23°C
Avg Low 16°C
Windiest Month
25 km/h
February (Gusts 44)
Worst Time to Visit
Consider avoiding January, February, March, December due to very cold temperatures, frequent rain.
Sun Position
Sunrise 05:52
Daylight 15.1h
Sunset 20:56
Live conditions —
Grimsby on the map · live conditions
Grimsby, Canada
- Continent
- Americas
- Country
- Canada
- City
- Grimsby
- Population
- 27.3K
- Coordinates
- 43.20°, -79.57°
Seasonal Breakdown
Spring
Mar–May
Avg High 12°C
Avg Low 4°C
Rain 11 days/mo
1/3 best months
Summer
Jun–Aug
Avg High 26°C
Avg Low 18°C
Rain 11 days/mo
3/3 best months
Autumn
Sep–Nov
Avg High 16°C
Avg Low 10°C
Rain 10 days/mo
1/3 best months
Winter
Dec–Feb
Avg High 2°C
Avg Low -3°C
Rain 11 days/mo
Climate Charts
Based on historical averages (2016–2025)
Monthly Temperatures
High Low Shaded bands show the typical range across the available yearly records.
Line chart showing monthly temperatures. Jan: 1°C / -4°C . Feb: 2°C / -4°C . Mar: 7°C / -1°C . Apr: 12°C / 4°C . May: 19°C / 10°C . Jun: 24°C / 16°C . Jul: 27°C / 20°C . Aug: 26°C / 19°C . Sep: 23°C / 16°C . Oct: 16°C / 10°C . Nov: 9°C / 3°C . Dec: 3°C / -1°C .
Monthly Rainfall
Rainfall
Bar chart showing monthly rainfall. Jan: 77 mm. Feb: 74 mm. Mar: 81 mm. Apr: 98 mm. May: 79 mm. Jun: 76 mm. Jul: 84 mm. Aug: 74 mm. Sep: 55 mm. Oct: 87 mm. Nov: 67 mm. Dec: 78 mm.
Monthly Humidity
Humidity
Line chart showing monthly humidity. Jan: 74%. Feb: 73%. Mar: 70%. Apr: 69%. May: 71%. Jun: 69%. Jul: 72%. Aug: 74%. Sep: 74%. Oct: 74%. Nov: 73%. Dec: 76%.
Monthly Wind Speed
Wind Speed Gusts
Bar chart showing monthly wind speed. Jan: 23 km/h . Feb: 25 km/h . Mar: 23 km/h . Apr: 22 km/h . May: 18 km/h . Jun: 19 km/h . Jul: 16 km/h . Aug: 17 km/h . Sep: 18 km/h . Oct: 21 km/h . Nov: 23 km/h . Dec: 24 km/h .
Sunshine
Sunshine
Sunshine: Jan: 5h. Feb: 6h. Mar: 8h. Apr: 9h. May: 11h. Jun: 12h. Jul: 12h. Aug: 11h. Sep: 10h. Oct: 7h. Nov: 6h. Dec: 4h.
UV Index
UV Index
Bar chart showing monthly UV index. Jan: UV 2. Feb: UV 3. Mar: UV 4. Apr: UV 5. May: UV 6. Jun: UV 7. Jul: UV 7. Aug: UV 6. Sep: UV 5. Oct: UV 4. Nov: UV 2. Dec: UV 2.
Monthly Daylight Hours
Daylight 12h reference
Monthly Dew Point & Comfort
Dew Point Dry Comfortable Humid Muggy Oppressive
Snow Days
Snow Days Snowfall
Snow Days: Jan: 13 days. Feb: 11 days. Mar: 8 days. Apr: 3 days. May: 0 days. Jun: 0 days. Jul: 0 days. Aug: 0 days. Sep: 0 days. Oct: 0 days. Nov: 4 days. Dec: 11 days.
Climate Trends
Average highs have cooled by 0.8°C (1.4°F) across the available records. Average rainfall has remained broadly steady.
2016 to 2025
Avg high Avg rainfall
Climate summary
| Last 12 months | All years | |
|---|---|---|
| Hottest month | Jul 2025 · 28°C | Jul · 27°C |
| Coldest month | Feb 2025 · -7°C | Jan · -4°C |
| Wettest month | May 2025 · 106 mm | Apr · 98 mm |
| Windiest month | Dec 2025 · 27 km/h | Feb · 25 km/h |
Month-by-Month Weather Table
January
Poor 
February
Poor March
Poor April
Poor May best
Good June best
Excellent July best
Excellent August best
Excellent September best
Excellent October
Good November
Poor December
Poor | Month | Temp | Feels Like | Rain | Sun | Humidity | UV | Status | Details |
|---|---|---|---|---|---|---|---|---|
| January | 1°C / -4°C | -4°C / -10°C | 10days (77 mm) Wet | 4.8h Fair | 74% Muggy | 1.9 Low | Poor | View Details |
| February | 2°C / -4°C | -3°C / -10°C | 10days (74 mm) Wet | 6.4h Fair | 73% Muggy | 3.1 Moderate | Poor | View Details |
| March | 7°C / -1°C | 2°C / -6°C | 10days (81 mm) Wet | 7.7h Good | 70% Muggy | 4.2 Moderate | Poor | View Details |
| April | 12°C / 4°C | 9°C / 0°C | 13days (98 mm) Wet | 8.9h Good | 69% Muggy | 5 Moderate | Poor | View Details |
| May best | 19°C / 10°C | 18°C / 8°C | 10days (79 mm) Wet | 10.5h Excellent | 71% Muggy | 6.1 High | Good | View Details |
| June best | 24°C / 16°C | 25°C / 16°C | 10days (76 mm) Wet | 12.1h Excellent | 69% Muggy | 6.7 High | Excellent | View Details |
| July best | 27°C / 20°C | 30°C / 21°C | 12days (84 mm) Wet | 12.1h Excellent | 72% Muggy | 6.8 High | Excellent | View Details |
| August best | 26°C / 19°C | 28°C / 20°C | 10days (74 mm) Wet | 11.3h Excellent | 74% Muggy | 6.1 High | Excellent | View Details |
| September best | 23°C / 16°C | 23°C / 16°C | 8days (55 mm) Wet | 9.7h Good | 74% Muggy | 5.1 High | Excellent | View Details |
| October | 16°C / 10°C | 14°C / 8°C | 11days (87 mm) Wet | 7h Good | 74% Muggy | 3.5 Moderate | Good | View Details |
| November | 9°C / 3°C | 5°C / -1°C | 10days (67 mm) Wet | 5.5h Fair | 73% Muggy | 2.2 Moderate | Poor | View Details |
| December | 3°C / -1°C | -1°C / -6°C | 12days (78 mm) Wet | 4.2h Fair | 76% Humid | 1.6 Low | Poor | View Details |
Compare Nearby City Climates
Frequently Asked Questions
The best months to visit Grimsby are May, June, July, August, September, when temperatures are comfortable and rainfall is at its lowest. This is based on 10-year climate averages for Grimsby, scoring temperature, rainfall, humidity, and sunshine hours.
The hottest month in Grimsby is July, with average daytime highs of 27°C (81°F). Plan outdoor activities for early morning or late afternoon if visiting during this period.
The coldest month in Grimsby is January, with average overnight lows of -4°C (24°F). Pack warm layers and expect shorter daylight hours during this period.
The wettest month in Grimsby is April, averaging 98mm of precipitation across 13 rainy days. An umbrella or waterproof jacket is essential.
The rainy season in Grimsby runs through April, July, December, October, with the heaviest rainfall in April. Based on 10-year averages for Grimsby.
Grimsby receives approximately 100 sunshine hours per year. The sunniest month is June with around 12 hours. Based on climate data for Grimsby.
The least favorable months to visit Grimsby are January, February, March, December, primarily due to very cold temperatures, frequent rain. For the best conditions, consider May, June, July, August, September instead.
The annual average UV index in Grimsby is 4, classified as moderate. Standard sun protection (sunscreen, hat) is recommended during prolonged outdoor exposure.
Average humidity in Grimsby is 72%, classified as moderate. Humidity levels are generally comfortable and should not affect outdoor activities for most people.
Yes, Grimsby receives snow. Months with snowfall average 8 snow days and 15 cm (6 in) of accumulation, with about 15 frost days during winter.
Average wind speeds in Grimsby are 21 km/h (13 mph). The windiest month is February with peak winds reaching 25 km/h (15 mph) (gusts up to 44 km/h / 27 mph).
Grimsby averages 3 clear-sky days per month with overall cloud cover around 62%. The clearest skies occur in September.
The annual average dew point in Grimsby is 6°C (43°F), which feels dry and comfortable. Outdoor activities are comfortable year-round from a humidity standpoint.
Grimsby has a Humid Subtropical climate, classified as Cfa under the Köppen system. Temperate climates have mild winters and warm summers, with rainfall spread across the year and four distinct seasons.
The 'feels like' temperature in Grimsby ranges from 5°C (41°F) to 12°C (54°F) on average. The 'feels like' temperature closely matches the actual temperature throughout most of the year.
Yes, July is a great time to visit Grimsby. It earns a climate score of 8.6/10 with Excellent.
For July in Grimsby, pack Umbrella, Waterproof jacket, Breathable clothing, Sunscreen (SPF 30+), Sun hat. With average highs of 27°C (81°F) and 12 rainy days, these essentials will keep you comfortable.
Data Source
Climate data derived from ERA5 reanalysis (ECMWF), averaged over 2016–2025. Sea surface temperature from marine reanalysis data. Climate scores and seasonal estimates are computed by WorldStats.
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