St. John's has a temperate climate with warm summers and cold winters.
Temperatures peak in August and drop to their lowest in February, while rainfall is highest during winter months.
Humidity remains high throughout the year creating cold and damp conditions.
| Month | 🌤️ | Avg High | Avg Temp | Avg Low | Record High | Record Low | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|---|---|
| January | ☔ | -0.0°C | -2.1°C | -4.1°C | 9.1°C | -14.8°C | 87% | 120 | 6.4 | 1.02 |
| February | ☔ | -0.7°C | -2.8°C | -4.9°C | 8.6°C | -17.3°C | 87% | 104 | 6.3 | 1.72 |
| March | ☔ | 0.4°C | -1.4°C | -3.2°C | 8.5°C | -18.0°C | 87% | 114 | 5.7 | 2.82 |
| April | ☔ | 2.9°C | 1.2°C | -0.4°C | 13.0°C | -7.3°C | 89% | 96 | 5.0 | 3.90 |
| May | ☔ | 6.1°C | 4.2°C | 2.3°C | 16.6°C | -2.6°C | 89% | 88 | 4.1 | 4.83 |
| June | ☔ | 10.3°C | 8.3°C | 6.3°C | 20.3°C | 0.7°C | 90% | 89 | 3.8 | 5.05 |
| July | ☔ | 15.6°C | 13.5°C | 11.5°C | 23.9°C | 4.4°C | 89% | 91 | 3.6 | 4.99 |
| August | ☔ | 17.3°C | 15.5°C | 13.7°C | 24.2°C | 7.8°C | 88% | 88 | 3.9 | 4.40 |
| September | ☔ | 14.6°C | 12.8°C | 11.1°C | 24.0°C | 4.5°C | 86% | 102 | 4.5 | 3.41 |
| October | ☔ | 10.1°C | 8.5°C | 6.9°C | 17.6°C | -0.8°C | 86% | 129 | 5.2 | 2.16 |
| November | ☔ | 5.9°C | 4.2°C | 2.5°C | 14.0°C | -7.5°C | 86% | 129 | 5.7 | 1.18 |
| December | ☔ | 2.1°C | 0.3°C | -1.4°C | 11.3°C | -14.0°C | 86% | 129 | 6.2 | 0.83 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Expect frosty nights and below-freezing temperatures during this Cold Winter period.
🌤️ Conditions are ideal for outdoor activities throughout the day in this Mild Summer.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025 climate normals · °C
Temperatures rise steadily from spring, peak in August, and gradually decline through autumn into winter.
These seasonal patterns make summer pleasant for travel, while winters can bring frost and occasional snowfall.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Rainfall is concentrated in the winter months. Humidity stays high (around 88%), peaking during summer months, which creates cold and damp conditions.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025
Across 45 years of records, St. John's's temperature has remained relatively stable over the past decade. Its hottest day reached 24.2°C in August 2018, and its coldest dropped to -18.0°C in March 1986. 2024 was the warmest year overall and 1985 the coolest.
The warmest year in St. John's's recorded history was 2024 (avg: 6.6°C), while the coldest was 1985 (avg: 3.7°C).
Average annual high/low · Last 30 years · °C
Total annual precipitation · Last 30 years · mm/year
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall (mm) | Avg Humidity | Avg Wind |
|---|---|---|---|---|---|---|---|---|
2025 | 7.8°C | 6.0°C | 4.1°C | 22.2°C | -8.3°C | 1162 | 87% | 4.7 m/s |
2024 | 8.2°C | 6.6°C | 5.0°C | 23.1°C | -10.9°C | 1203 | 89% | 4.7 m/s |
2023 | 7.1°C | 5.6°C | 4.0°C | 23.9°C | -11.3°C | 1080 | 88% | 4.8 m/s |
2022 🔥 | 8.4°C | 6.6°C | 4.8°C | 23.3°C | -8.5°C | 1153 | 87% | 5.0 m/s |
2021 | 8.0°C | 6.3°C | 4.6°C | 22.0°C | -9.1°C | 1040 | 87% | 5.1 m/s |
2020 | 7.7°C | 5.8°C | 3.9°C | 22.2°C | -10.9°C | 1221 | 87% | 4.9 m/s |
2019 | 6.5°C | 4.7°C | 2.9°C | 20.7°C | -12.6°C | 1118 | 87% | 4.9 m/s |
2018 | 6.9°C | 5.1°C | 3.2°C | 24.2°C | -9.1°C | 1168 | 87% | 5.1 m/s |
2017 | 7.1°C | 5.2°C | 3.4°C | 20.5°C | -10.6°C | 1181 | 87% | 5.0 m/s |
2016 | 7.3°C | 5.4°C | 3.6°C | 21.2°C | -8.4°C | 1220 | 87% | 5.1 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), August is typically the hottest month in St. John's, Newfoundland and Labrador, with average high temperatures around 17.3°C.
February is the coldest month in St. John's, with average low temperatures around -4.9°C.
December receives the most rainfall with approximately 129 mm, while August is the driest with 88 mm.
The highest recorded temperature was 24.2°C in August 2018. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was -18.0°C in March 1986.
This page covers 45 years of climate data from 1981 to 2025. As new data is added to the database the page automatically reflects the updated coverage.
St. John's receives the most sunlight in June with an average solar radiation of 5.05 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in Newfoundland and Labrador.
All climate data is sourced from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite and model data. It provides monthly averages for temperature, precipitation, humidity, wind speed, and solar radiation.
All weather data is sourced from NASA POWER (Prediction of Worldwide Energy Resources), a NASA project providing solar and meteorological data for renewable energy, building efficiency, and agricultural research.
