When to plant watermelons in Santiago de Compostela: 5 June – 7 September

In Santiago de Compostela, watermelon: sow for seedlings from 17 April to 10 August; plant into a greenhouse from 15 May to 7 September; plant out into open ground from 5 June to 7 September. For plants and seeds, the places nearby include Oforno Garden (garden centre, 4 km); addresses and opening hours are below.

Watermelon in Santiago de Compostela: soil, season and weather

In Santiago de Compostela the soil, not frost, sets the date: the last frost is over around 6 February, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 5 June, 119 days later.

Last spring frost	6 February
Top 7 cm of soil at 18 °C	5 June, 119 days after the last frost
Into an unheated greenhouse	15 May – 7 September; May outside: 9.8 °C at night, 18.6 °C by day; card 18–35 °C
First autumn frost	17 December, 195 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	3 August – 5 November
Days left for picking	136
Daylight	14:22 on 8 May, 15:12 on 5 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, July, has 6 rainy days

The same dates in Santiago de Compostela hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Santiago de Compostela: care after planting

Planted on 5 June: in the first weeks water every 5 days.

Feeding, by the card’s schedule from that day:

5 June — feed: balanced (NPK)

Pests and diseases of watermelon to watch for:

Dates count from the first planting day of the window above; a later planting moves them by as many days.

Weather in Santiago de Compostela during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 24.5 °C. Months that stay below 18 °C even by day on average: November (13.9 °C) and December (12.2 °C). Nights average below 18 °C in every month of the season, from 6 °C to 14.8 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	20.8	12.5	78	12	15:20
July	23.7	14.3	29	6	15:03
August	24.5	14.8	33	6	13:58
September	21.7	13.2	80	11	12:33
October	18.6	11.2	205	15	11:06
November	13.9	7.8	193	17	9:46
December	12.2	6	215	16	9:03

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

1 of the nearest cities share Santiago de Compostela's date.

City	Distance	Date	Difference
Pontevedra	51 km	from 26 May	10 days earlier
A Coruña	54 km	from 5 June	same day
Vigo	74 km	from 9 May	27 days earlier
Lugo	80 km	1 June – 25 August	4 days earlier
Ourense	81 km	1 June – 24 August	4 days earlier
Viana do Castelo	135 km	30 May – 2 September	6 days earlier

Where to buy watermelon plants and seeds near Santiago de Compostela

Buy plants ready to set out from 5 June to 7 September (from 15 May to 7 September for an unheated greenhouse); seed for raising your own is sown from 17 April to 10 August. Within 15 km of Santiago de Compostela OpenStreetMap lists 8 garden centres, 11 farm-supply shops, 4 plant nurseries and 4 markets (collected 28 October 2026).

Agrícola Santa Lucía — farm supply
4 km
Campo Grande — farm supply
9 km
Mercado de Abastos — market
1 km · mercadodeabastosdesantiago.com
Oforno Garden — garden centre
Rúa do País Vasco 27, 15705 Santiago de Compostela · Mon–Sat 10:00–21:00 · 4 km · ofornogarden.com

Each window starts on the Greenly calendar date and ends on the last day that still leaves the crop’s days to harvest (from its card) before the average first autumn frost, plus six weeks of picking for crops harvested over weeks (tomatoes, peppers, aubergines, cucumbers, courgettes, pumpkins, watermelons, beans) — our rule; earlier in the window is safer.

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