Climate Insights for Horsham

The climate in Horsham is temperate. The average annual temperature is 15°C and approximately 452mm of precipitation falls per year. November is the wettest month, receiving around 51mm of rainfall. Horsham 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: January, February, December. The coldest months are July, August, June, when temperatures can drop to 5°C.

Temperatures in Horsham vary considerably across the year, with a 25°C difference between the coldest and warmest months. The warmest month is January, when average highs reach 30°C and the mean temperature sits around 22°C. July is the coolest month, with minimum temperatures around 5°C and an average of 8°C. On average, daily temperatures fluctuate by about 11°C between overnight lows and afternoon highs. The sharpest temperature change occurs between March and April, with a 4°C shift in average temperatures.

Horsham is a relatively dry area, receiving approximately 452mm of precipitation annually, which averages out to around 38mm per month. The wettest month is November, averaging 51mm of rainfall. October and September also tend to see above-average precipitation. The driest month is February, with just 9mm. That's 42mm less than November, 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.

Horsham is moderately windy, with an average annual wind speed of 21km/h. For context, sustained winds below 12km/h are generally light, while anything above 25km/h is considered strong. The windiest month is December, averaging 22km/h, noticeable enough to affect lighter outdoor activities. The calmest conditions occur in June, with average winds dropping to 18km/h, making it an ideal period for wind-sensitive activities. Wind conditions are fairly consistent throughout the year, varying by only 4km/h between the calmest and windiest months.

It is currently autumn in Horsham, which began on March 20, 2026. Horsham 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 January at around 30°C, while the coldest stretch bottoms out in July near 5°C. Winter is next, beginning on June 21, 2026 — 88 days from now.

The best time to visit Horsham is during January, February, March, November and December, when the weather is most comfortable for travellers. During these months, average temperatures hover around 20°C with modest rainfall averaging 30mm per month. By contrast, July can be quite cold with temperatures dropping to 5°C. A light rain jacket is recommended, though showers are generally brief and shouldn't disrupt your plans.

The table below shows monthly climate averages for Horsham 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.