London in July: what to plant
Over the last 5 years, July in London has run 14.9–24.2°C with about 54 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 July 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 12.0 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-July, 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 | 87 | Oct 9 |
| 🥢 Green Beans | 74 | Sep 26 |
| 🌿 Amaranth greens | 65 | Sep 17 |
| 🏵️ Marigold | 51 | Sep 3 |
| 🥔 Potato | 86 | Oct 8 |
| 🌿 Garlic chives | 63 | Sep 15 |
| 🥬 Celery | 113 | Nov 4 |
| 🧅 Onion | 84 | Oct 6 |
| 🍓 Strawberry | 51 | Sep 3 |
| 🧅 Leek | 85 | Oct 7 |
⏳ Too late this month: Sweet Corn, Sunflower would still be in the ground when the first frost arrives (around Nov 21). Sow them earlier in the year, or grow them under cover.
🌡️ 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.
- 🌽 Sweet Corn about 95 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🥒 Zucchini about 69 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🥢 Green Beans about 63 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🌿 Amaranth greens about 58 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🌻 Sunflower about 87 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🏵️ Marigold about 48 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🥔 Potato about 72 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🌿 Garlic chives about 59 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🥬 Celery about 89 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🧅 Onion about 73 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🍓 Strawberry about 49 days to harvest Recent mean 19.5°C — right in the sweet spot
- 🧅 Leek about 75 days to harvest Recent mean 19.5°C — right in the sweet spot
Leave these for another month
- 🌿 Rocket — 17 day(s) of heat stress
- 🌿 Spinach — 9 day(s) of heat stress
- 🍈 Winter melon — Slow going at current temperatures (~213 days)
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.