London in June: what to plant
Over the last 5 years, June in London has run 12.8–22.6°C with about 51 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 London is actually having, today.
Grow one in London's weather right now →❄️ No sub-zero nights in June 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 9, first autumn frost around Nov 21 — roughly 257 frost-free days. Sow tender crops after the last frost date and make sure they finish before the first.
☀️ About 12.8 h of sunshine a day this month. Within the month it warms by about 5.4°C from the first ten days to the last.
Sow this month — when would you harvest?
Assuming you sow in mid-June, then adding up the warmth London usually gets, one day at a time — which is why some of these run past the end of the month.
| Crop | Days | Harvest around |
|---|---|---|
| 🥒 Zucchini | 70 | Aug 23 |
| 🥢 Green Beans | 64 | Aug 17 |
| 🌿 Amaranth greens | 59 | Aug 12 |
| 🌻 Sunflower | 91 | Sep 13 |
| 🏵️ Marigold | 48 | Aug 1 |
| 🥔 Potato | 73 | Aug 26 |
| 🌿 Garlic chives | 59 | Aug 12 |
| 🥬 Celery | 93 | Sep 15 |
| 🧅 Onion | 74 | Aug 27 |
| 🍓 Strawberry | 49 | Aug 2 |
| 🧅 Leek | 76 | Aug 29 |
| 🌿 Dill | 38 | Jul 22 |
🌡️ Bitter melon, Luffa, Winter melon, Aubergine, Okra never accumulate enough heat outdoors in London — not in any month. Locally these need a greenhouse or a warm windowsill.
Best crops to sow now
They are all ideal for this month — the only real difference is how long each one takes, so pick whatever you want to eat.
- 🥒 Zucchini about 85 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🥢 Green Beans about 78 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🌿 Amaranth greens about 72 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🌻 Sunflower about 104 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🏵️ Marigold about 57 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🥔 Potato about 85 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🌿 Garlic chives about 67 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🥬 Celery about 101 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🧅 Onion about 83 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🍓 Strawberry about 55 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🧅 Leek about 84 days to harvest Recent mean 17.7°C — right in the sweet spot
- 🌿 Dill about 44 days to harvest Recent mean 17.7°C — right in the sweet spot
Leave these for another month
- 🌶️ Okra — Recent mean 17.7°C is too cold (ideal 20–33°C)
- 🍆 Aubergine — Recent mean 17.7°C is too cold (ideal 18–32°C)
- 🍈 Winter melon — Recent mean 17.7°C is too cold (ideal 18–32°C)
Other months in London
📍 Somewhere else? Look up your own city →
Temperature and rainfall come from Open-Meteo's historical observations for London, 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.