Hangzhou in September: what to plant
Over the last 5 years, September in Hangzhou has run 22.6–30.1°C with about 149 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 Hangzhou is actually having, today.
Grow one in Hangzhou's weather right now →❄️ No sub-zero nights in September in the last 5 years — frost is not the limiting factor here.
🗓️ This month sits inside the frost-free window. Average last spring frost around Feb 21, first autumn frost around Dec 12 — roughly 296 frost-free days. Sow tender crops after the last frost date and make sure they finish before the first.
☀️ About 8.4 h of sunshine a day this month. Within the month it cools by about 3.1°C from the first ten days to the last — the window for autumn sowings is opening.
Sow this month — when would you harvest?
Assuming you sow in mid-September, then adding up the warmth Hangzhou usually gets, one day at a time — which is why some of these run past the end of the month.
| Crop | Days | Harvest around |
|---|---|---|
| 🏵️ Marigold | 38 | Oct 22 |
| 🌿 Amaranth greens | 47 | Oct 31 |
| 🌱 Microgreens | 5 | Sep 19 |
| 🧅 Onion | 75 | Nov 28 |
| 🥢 Green Beans | 54 | Nov 7 |
⏳ Too late this month: Chili Pepper, Aubergine, Edamame, Pumpkin, Sunflower, Tomato, Cucumber would still be in the ground when the first frost arrives (around Dec 12). Sow them earlier in the year, or grow them under cover.
Best crops to sow now
- 🌶️ Chili Pepper Ideal about 89 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🍆 Aubergine Ideal about 98 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🫛 Edamame Ideal about 74 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🎃 Pumpkin Ideal about 71 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🏵️ Marigold Ideal about 32 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🌻 Sunflower Ideal about 55 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🌿 Amaranth greens Ideal about 34 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🌱 Microgreens Ideal about 5 days to harvest 🪴 Windowsill pot — sheltered from outdoor weather
- 🧅 Onion Marginal about 50 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🍅 Tomato Ideal about 80 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🥒 Cucumber Ideal about 60 days to harvest Recent mean 26.3°C — right in the sweet spot
- 🥢 Green Beans Ideal about 37 days to harvest Recent mean 26.3°C — right in the sweet spot
Leave these for another month
- 🌿 Dill — Recent mean 26.3°C is too hot (ideal 9–26°C)
- 🌿 Parsley — Recent mean 26.3°C is too hot (ideal 7–25°C)
- 🌿 Coriander — Recent mean 26.3°C is too hot (ideal 8–24°C)
Other months in Hangzhou
📍 Somewhere else? Look up your own city →
Temperature and rainfall come from Open-Meteo's historical observations for Hangzhou, 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.