When to plant watermelons in Charleroi: 10 June – 6 August

In Charleroi, watermelon: sow for seedlings from 22 April to 9 July; plant into a greenhouse from 20 May to 6 August; plant out into open ground from 10 June to 6 August. For plants and seeds, the places nearby include Crèmerie du Fonds des Vaulx (farm shop, 14 km); addresses and opening hours are below.

Watermelon in Charleroi: soil, season and weather

In Charleroi the soil, not frost, sets the date: the last frost is over around 13 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 10 June, 58 days later.

Last spring frost	13 April
Top 7 cm of soil at 18 °C	10 June, 58 days after the last frost
Into an unheated greenhouse	20 May – 6 August; May outside: 8.2 °C at night, 18 °C by day; card 18–35 °C
First autumn frost	15 November, 158 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	8 August – 4 October
Days left for picking	99
Daylight	15:21 on 13 May, 16:20 on 10 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, August, has 12 rainy days

The same dates in Charleroi hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.

Watermelon in Charleroi: care after planting

Planted on 10 June: in the first weeks water every 5 days.

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

10 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 Charleroi during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 23.3 °C. Months that stay below 18 °C even by day on average: October (15.3 °C) and November (9.7 °C). Nights average below 18 °C in every month of the season, from 4.3 °C to 13.9 °C.

Month	Day, °C	Night, °C	Rain, mm	Rainy days	Daylight on the 15th
June	21.8	12.4	78	11	16:25
July	22.9	13.5	71	11	16:02
August	23.3	13.9	58	12	14:33
September	20	11.4	65	10	12:41
October	15.3	8.8	78	13	10:48
November	9.7	4.3	68	13	9:02

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

Around Charleroi, Hasselt is 11 days earlier and Namur 1 day later.

City	Distance	Date	Difference
Namur	31 km	11 June – 6 August	1 day later
Mons	35 km	10 June – 10 August	same day
Brussels	49 km	8 June – 13 August	2 days earlier
Leuven	55 km	31 May – 13 August	10 days earlier
Liège	84 km	4 June – 10 August	6 days earlier
Hasselt	86 km	30 May – 9 August	11 days earlier

Where to buy watermelon plants and seeds near Charleroi

Buy plants ready to set out from 10 June to 6 August (from 20 May to 6 August for an unheated greenhouse); seed for raising your own is sown from 22 April to 9 July. Within 15 km of Charleroi OpenStreetMap lists 15 garden centres, 2 farm-supply shops, 2 plant nurseries, 7 markets and 7 farm shops (collected 27 October 2026).

Crèmerie du Fonds des Vaulx — farm shop
Wed 14:00–17:00; Thu 14:00–18:00; Fri, Sat 09:00–18:00 · 14 km
Jardiland — garden centre
5 km
Emmanuel Glinne — garden centre
14 km
Raunet — plant nursery
8 km

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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