Climate Insights for Northam

The climate in Northam is warm and mild. The average annual temperature is 22°C and approximately 431mm of precipitation falls per year. December is the wettest month, receiving around 100mm of rainfall. Northam is in the Southern Hemisphere. The seasons are reversed — summer runs from December to February, while winter falls between June and August. The summer months are: November, October, December. The coldest months are July, June, August, when temperatures can drop to 7°C.

Temperatures in Northam vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is November, when average highs reach 32°C and the mean temperature sits around 26°C. July is the coolest month, with minimum temperatures around 7°C and an average of 14°C. On average, daily temperatures fluctuate by about 14°C between overnight lows and afternoon highs. The sharpest temperature change occurs between August and September, with a 4°C shift in average temperatures.

Northam is a relatively dry area, receiving approximately 431mm of precipitation annually, which averages out to around 36mm per month. The wettest month is December, averaging 100mm of rainfall. January and February also tend to see above-average precipitation. The driest month is August, with just 1mm. That's 99mm less than December, the wettest month. Rainfall is heavily concentrated in certain months, creating a distinct wet and dry season. Visitors should plan around these patterns, as the difference between peak and low months is dramatic.

Northam is mildly breezy, with an average annual wind speed of 13km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is October, averaging 16km/h, though still comfortable for most outdoor activities. The calmest conditions occur in May, with average winds dropping to 10km/h, making it an ideal period for wind-sensitive activities. There is moderate seasonal variation in wind speed, with a 6km/h gap between the calmest and windiest months.

It is currently winter in Northam, which began on June 21, 2026. Northam is in the Southern Hemisphere, where the seasons are reversed — spring starts in September, summer in December, autumn in March, and winter in June. The warmest period peaks in November at around 32°C, while the coldest stretch bottoms out in July near 7°C. Autumn is next, beginning on March 20, 2026 — 3 days from now.

The best time to visit Northam is during March, April, May, August, September and October, when the weather is most comfortable for travellers. During these months, average temperatures hover around 22°C with modest rainfall averaging 20mm per month. By contrast, November can be uncomfortably hot with highs reaching 32°C, while July is the coldest period with lows dropping to 7°C. With minimal rainfall expected, you can pack light and plan outdoor activities with confidence.

The table below shows monthly climate averages for Northam based on historical weather data. Min and max temperatures represent typical overnight lows and afternoon highs for each month, shown in degrees Celsius (°C). Precipitation is measured in millimetres (mm) and indicates the average total rainfall per month. Wind speed is the average sustained speed in kilometres per hour (km/h). All values are based on averages from over 10 years of historical weather data. The current month is highlighted for quick reference.