Tokyo in August: what to plant
Over the last 5 years, August in Tokyo has run 25.0–32.7°C with about 119 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 Tokyo is actually having, today.
Grow one in Tokyo's weather right now →❄️ No sub-zero nights in August 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 29, first autumn frost around Dec 14 — roughly 289 frost-free days. Sow tender crops after the last frost date and make sure they finish before the first.
☀️ About 10.2 h of sunshine a day this month. Within the month it cools by about 0.9°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-August, then adding up the warmth Tokyo usually gets, one day at a time — which is why some of these run past the end of the month.
| Crop | Days | Harvest around |
|---|---|---|
| 🌿 Amaranth greens | 32 | Sep 15 |
| 🌻 Sunflower | 58 | Oct 11 |
| 🌱 Microgreens | 5 | Aug 19 |
| 🏵️ Marigold | 30 | Sep 13 |
| 🥒 Cucumber | 73 | Oct 26 |
| 🌽 Sweet Corn | 60 | Oct 13 |
⏳ Too late this month: Okra, Winter melon, Aubergine, Luffa, Bitter melon, Yardlong bean would still be in the ground when the first frost arrives (around Dec 14). Sow them earlier in the year, or grow them under cover.
Best crops to sow now
- 🌶️ Okra Ideal about 55 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🍈 Winter melon Ideal about 96 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🍆 Aubergine Ideal about 84 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🥒 Luffa Ideal about 73 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🌿 Amaranth greens Ideal about 30 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🌻 Sunflower Ideal about 49 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🌱 Microgreens Ideal about 5 days to harvest 🪴 Windowsill pot — sheltered from outdoor weather
- 🏵️ Marigold Good about 28 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🥒 Bitter melon Ideal about 67 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🥢 Yardlong bean Ideal about 59 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🥒 Cucumber Ideal about 51 days to harvest Recent mean 28.8°C — right in the sweet spot
- 🌽 Sweet Corn Ideal about 48 days to harvest Recent mean 28.8°C — right in the sweet spot
Leave these for another month
- 🌿 Dill — Recent mean 28.8°C is too hot (ideal 9–26°C)
- 🌿 Parsley — Recent mean 28.8°C is too hot (ideal 7–25°C)
- 🌿 Coriander — Recent mean 28.8°C is too hot (ideal 8–24°C)
Other months in Tokyo
📍 Somewhere else? Look up your own city →
Temperature and rainfall come from Open-Meteo's historical observations for Tokyo, 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.