Xi'an in September: what to plant
Over the last 5 years, September in Xi'an has run 18.3–26.9°C with about 138 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 Xi'an is actually having, today.
Grow one in Xi'an'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 Mar 6, first autumn frost around Nov 18 — roughly 258 frost-free days. Sow tender crops after the last frost date and make sure they finish before the first.
☀️ About 7.4 h of sunshine a day this month. Within the month it cools by about 4.8°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 Xi'an usually gets, one day at a time — which is why some of these run past the end of the month.
| Crop | Days | Harvest around |
|---|---|---|
| 🧅 Onion | 209 | Apr 11 |
| 🌱 Microgreens | 6 | Sep 20 |
| 🌿 Garlic chives | 191 | Mar 24 |
| 🥬 Bok Choy | 34 | Oct 18 |
⏳ Too late this month: Tomato, Green Beans, Edamame, Pumpkin, Marigold, Sunflower, Amaranth greens, Carrot would still be in the ground when the first frost arrives (around Nov 18). Sow them earlier in the year, or grow them under cover.
Best crops to sow now
- 🍅 Tomato Ideal about 104 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🥢 Green Beans Ideal about 48 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🫛 Edamame Ideal about 96 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🎃 Pumpkin Ideal about 92 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🧅 Onion Ideal about 60 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🏵️ Marigold Ideal about 39 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🌻 Sunflower Ideal about 69 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🌿 Amaranth greens Ideal about 44 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🌱 Microgreens Ideal about 6 days to harvest 🪴 Windowsill pot — sheltered from outdoor weather
- 🌿 Garlic chives Good about 49 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🥬 Bok Choy Good about 26 days to harvest Recent mean 22.6°C — right in the sweet spot
- 🥕 Carrot Good about 52 days to harvest Recent mean 22.6°C — right in the sweet spot
Leave these for another month
- 🌿 Rocket — Recent mean 22.6°C is too hot (ideal 6–22°C)
- 🫛 Peas — Recent mean 22.6°C is too hot (ideal 7–21°C)
- 🌿 Spinach — Recent mean 22.6°C is too hot (ideal 5–22°C)
Other months in Xi'an
📍 Somewhere else? Look up your own city →
Temperature and rainfall come from Open-Meteo's historical observations for Xi'an, 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.