September in Sydney is spring, when warm-season crops go in once frost risk has passed. Here’s exactly what to sow from seed, plant as seedlings, and harvest this month in a temperate climate, tuned to Sydney’s frosts and temperatures, not a generic national calendar.
Typical Temps
8-29°C
winter low to summer high
Frost
Frost-free (coastal), light frosts inland June-August
Climate Zone
Temperate
New South Wales
Frost watch: Coastal and eastern Sydney effectively never frosts, so tender crops can stay in year-round. Only gardens west toward the Blue Mountains foothills need to watch June-August. See frost dates for every city →
Sydney's wet summers (November-February) bring fungal diseases, ensure beds have excellent drainage and space plants for airflow around tomatoes and zucchini.
Coastal Sydney rarely frosts, so you can grow silverbeet, kale, and Asian greens year-round without frost protection.
The summer humidity makes basil bolt quickly, pinch flowers regularly and grow heat-tolerant varieties like Italian Large Leaf.
Sydney's dry periods in late summer stress plants, a thick layer of sugar cane mulch over raised beds retains moisture and keeps roots cool.
From the makers
This calendar tells you what's possible in September, Plant Planner tells you exactly how many of each crop to grow for your family, how to arrange them in your beds, and sends reminders so you never miss a window.
In September, Sydney gardeners can sow Tomato, Capsicum, Eggplant, Cucumber, Zucchini, Beans and more from seed, and plant out Tomato seedlings, Capsicum, Lettuce, Silverbeet, Broccoli (last) as seedlings. Sydney sits in the Temperate climate zone, so these picks are timed to local conditions.
September falls in spring, when warm-season crops go in once frost risk has passed. In Sydney, expect winter lows around 8°C and summer highs near 29°C. Coastal and eastern Sydney effectively never frosts, so tender crops can stay in year-round. Only gardens west toward the Blue Mountains foothills need to watch June-August.
Yes, September is a suitable window to start or plant tomatoes in Sydney. Give them full sun, support, and consistent watering. See the full month-by-month calendar for the rest of the season.
In a Sydney garden, September typically brings harvests of Broccoli, Cauliflower, Peas, Snow Peas, Lettuce, Silverbeet, Leek. Actual timing depends on when each crop was planted.