Hong Kong in September: what to plant
Over the last 5 years, September in Hong Kong has run 24.9–29.6°C with about 294 mm of rain across the month. Here is what weather like that will carry to harvest.
Everything above is a five-year average. In the game it is this — the weather Hong Kong is actually having, today.
Grow one in Hong Kong's weather right now →❄️ No sub-zero nights in September in the last 5 years — frost is not the limiting factor here.
🗓️ No night at or below 0°C in the last 5 years — frost is not a limiting factor here, and tender crops can stay out year-round.
☀️ About 9.2 h of sunshine a day this month. Temperatures hold steady through the month.
Sow this month — when would you harvest?
Assuming you sow in mid-September, then adding up the warmth Hong Kong usually gets, one day at a time — which is why some of these run past the end of the month.
| Crop | Days | Harvest around |
|---|---|---|
| 🍈 Winter melon | 202 | Apr 4 |
| 🌶️ Okra | 113 | Jan 5 |
| 🍆 Aubergine | 179 | Mar 12 |
| 🥒 Luffa | 146 | Feb 7 |
| 🌻 Sunflower | 59 | Nov 12 |
| 🧅 Onion | 52 | Nov 5 |
| 🌱 Microgreens | 5 | Sep 19 |
| 🏵️ Marigold | 31 | Oct 15 |
| 🌿 Amaranth greens | 34 | Oct 18 |
| 🥕 Carrot | 44 | Oct 28 |
| 🌶️ Chili Pepper | 136 | Jan 28 |
| 🥒 Bitter melon | 121 | Jan 13 |
Best crops to sow now
- 🍈 Winter melon Ideal about 105 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🌶️ Okra Ideal about 62 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🍆 Aubergine Ideal about 92 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🥒 Luffa Ideal about 80 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🌻 Sunflower Ideal about 52 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🧅 Onion Ideal about 48 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🌱 Microgreens Ideal about 5 days to harvest 🪴 Windowsill pot — sheltered from outdoor weather
- 🏵️ Marigold Ideal about 30 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🌿 Amaranth greens Ideal about 32 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🥕 Carrot Marginal about 41 days to harvest Recent mean 27.3°C is too hot (ideal 7–27°C)
- 🌶️ Chili Pepper Ideal about 84 days to harvest Recent mean 27.3°C — right in the sweet spot
- 🥒 Bitter melon Ideal about 74 days to harvest Recent mean 27.3°C — right in the sweet spot
Leave these for another month
- 🌿 Dill — Recent mean 27.3°C is too hot (ideal 9–26°C)
- 🌿 Parsley — Recent mean 27.3°C is too hot (ideal 7–25°C)
- 🌿 Coriander — Recent mean 27.3°C is too hot (ideal 8–24°C)
Other months in Hong Kong
📍 Somewhere else? Look up your own city →
Temperature and rainfall come from Open-Meteo's historical observations for Hong Kong, averaged day by day over the last 5 years. Whether a crop finishes in time is worked out from its own starting temperature and heat requirement — those numbers are listed on each crop page if you want to check them.