Northam has a warm subtropical climate with warm summers and mild winters.
Temperatures peak in January and drop to their lowest in July, while rainfall is highest during summer months.
Humidity remains moderate throughout the year creating warm and dry conditions.
| Month | 🌤️ | Avg High | Avg Temp | Avg Low | Record High | Record Low | Humid % | Rain (mm) | Wind (m/s) | Solar (kWh/m²) |
|---|---|---|---|---|---|---|---|---|---|---|
| January | 🌞 | 35.3°C | 26.4°C | 17.5°C | 46.4°C | 7.4°C | 38% | 21 | 4.2 | 8.38 |
| February | 🌞 | 34.5°C | 26.1°C | 17.7°C | 47.5°C | 7.1°C | 42% | 15 | 4.0 | 7.48 |
| March | 🌞 | 31.4°C | 23.6°C | 15.9°C | 43.0°C | 6.6°C | 47% | 20 | 3.6 | 6.10 |
| April | ☀️ | 26.5°C | 19.6°C | 12.6°C | 38.5°C | 4.3°C | 57% | 22 | 3.1 | 4.56 |
| May | ☀️ | 21.4°C | 15.3°C | 9.2°C | 32.9°C | 2.3°C | 67% | 54 | 2.8 | 3.40 |
| June | 🌤️ | 17.5°C | 12.2°C | 6.9°C | 25.2°C | -2.4°C | 77% | 71 | 2.8 | 2.82 |
| July | ☔ | 16.1°C | 10.9°C | 5.8°C | 23.2°C | -0.9°C | 81% | 85 | 2.6 | 2.97 |
| August | 🌤️ | 17.0°C | 11.4°C | 5.8°C | 28.4°C | -0.6°C | 81% | 66 | 2.6 | 3.83 |
| September | 🌤️ | 20.1°C | 13.5°C | 6.9°C | 34.9°C | 0.1°C | 75% | 42 | 2.8 | 5.08 |
| October | ☀️ | 24.8°C | 16.9°C | 9.0°C | 38.0°C | 0.7°C | 63% | 25 | 3.1 | 6.58 |
| November | ☀️ | 29.4°C | 20.9°C | 12.4°C | 43.8°C | 3.9°C | 49% | 18 | 3.7 | 7.76 |
| December | 🌞 | 33.2°C | 24.3°C | 15.5°C | 45.2°C | 6.6°C | 40% | 11 | 4.0 | 8.52 |
Showing average climate conditions across 45 years (1981–2025)
🧥 Light layers are sufficient — this Mild Winter stays cool without prolonged hard freezes.
🌤️ Limit midday outdoor exposure and stay hydrated — this is an intense Hot 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 January, and gradually decline through autumn into winter.
These seasonal patterns offer comfortable conditions year-round, with warm summers and mild winters.
Monthly rainfall · 1981–2025 seasonal trends · mm/month
Rainfall is concentrated in the summer months. Humidity stays moderate (around 60%), peaking during summer months, which creates warm and dry conditions.
☔ Moderate Rainfall expected — carry rain gear and plan outdoor activities around these months.
Monthly averages · 1981–2025
Across 45 years of records, Northam's temperature has remained relatively stable over the past decade. Its hottest day reached 47.5°C in February 2007, and its coldest dropped to -2.4°C in June 1981. 2024 was the warmest year overall and 1986 the coolest.
The warmest year in Northam's recorded history was 2024 (avg: 19.9°C), while the coldest was 1986 (avg: 17.3°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 | 26.2°C | 19.1°C | 11.9°C | 43.7°C | 1.6°C | 560 | 60% | 3.2 m/s |
2024 | 27.1°C | 19.9°C | 12.7°C | 46.0°C | 1.9°C | 429 | 57% | 3.3 m/s |
2023 | 26.7°C | 19.3°C | 12.0°C | 41.3°C | 0.9°C | 390 | 58% | 3.2 m/s |
2022 | 25.3°C | 18.3°C | 11.3°C | 42.4°C | 2.4°C | 493 | 62% | 3.3 m/s |
2021 🌧️ | 24.9°C | 18.1°C | 11.3°C | 42.1°C | 2.0°C | 618 | 62% | 3.2 m/s |
2020 | 25.8°C | 18.8°C | 11.7°C | 45.6°C | 2.4°C | 505 | 60% | 3.3 m/s |
2019 🔥 | 27.2°C | 19.5°C | 11.8°C | 43.8°C | 0.9°C | 299 | 55% | 3.1 m/s |
2018 | 25.8°C | 18.6°C | 11.5°C | 42.2°C | 1.0°C | 432 | 60% | 3.2 m/s |
2017 | 25.6°C | 18.5°C | 11.4°C | 43.0°C | 0.6°C | 489 | 60% | 3.2 m/s |
2016 | 24.6°C | 17.6°C | 10.7°C | 43.5°C | -0.1°C | 511 | 63% | 3.2 m/s |
Showing 1 to 10 of 45 years
Based on 45 years of data (1981–2025), January is typically the hottest month in Northam, Western Australia, with average high temperatures around 35.3°C.
July is the coldest month in Northam, with average low temperatures around 5.8°C.
July receives the most rainfall with approximately 85 mm, while December is the driest with 11 mm.
The highest recorded temperature was 47.5°C in February 2007. This is part of the historical record spanning 1981–2025.
The lowest recorded temperature was -2.4°C in June 1981.
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.
Northam receives the most sunlight in December with an average solar radiation of 8.52 kWh/m²/day. This solar radiation data, sourced from NASA POWER, is useful for solar energy planning and agriculture in Western Australia.
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.
