When to plant watermelons in Namur: 11 June – 6 August

In Namur, watermelon: sow for seedlings from 23 April to 9 July; plant into a greenhouse from 21 May to 6 August; plant out into open ground from 11 June to 6 August.

Watermelon in Namur: soil, season and weather

In Namur the soil, not frost, sets the date: the last frost is over around 11 April, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 11 June, 61 days later.

Last spring frost	11 April
Top 7 cm of soil at 18 °C	11 June, 61 days after the last frost
Into an unheated greenhouse	21 May – 6 August; May outside: 8.2 °C at night, 18 °C by day; card 18–35 °C
First autumn frost	15 November, 157 days after the start
Days in the bed to the first harvest (card)	59
First harvest, if planted in this window	9 August – 4 October
Days left for picking	98
Daylight	15:24 on 14 May, 16:22 on 11 June
Watering outdoors when fruiting (card)	every 5 days; the driest month, August, has 12 rainy days

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

Watermelon in Namur: care after planting

Planted on 11 June: in the first weeks water every 5 days.

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

11 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 Namur during the watermelon season

No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 23.1 °C. Months that stay below 18 °C even by day on average: October (15.2 °C) and November (9.6 °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	12.5	76	11	16:25
July	22.8	13.5	70	12	16:02
August	23.1	13.9	62	12	14:34
September	19.8	11.4	65	11	12:41
October	15.2	8.8	75	13	10:48
November	9.6	4.3	67	13	9:01

ERA5 2016–2025, Open-Meteo

Watermelon in nearby cities

All the nearest cities on our list plant watermelon earlier than Namur; the closest date is in Charleroi, 1 day earlier.

City	Distance	Date	Difference
Charleroi	31 km	10 June – 6 August	1 day earlier
Leuven	47 km	31 May – 13 August	11 days earlier
Liège	53 km	4 June – 10 August	7 days earlier
Brussels	56 km	8 June – 13 August	3 days earlier
Hasselt	61 km	30 May – 9 August	12 days earlier
Mons	65 km	10 June – 10 August	1 day earlier

Where to buy watermelon plants and seeds near Namur

Buy plants ready to set out from 11 June to 6 August (from 21 May to 6 August for an unheated greenhouse); seed for raising your own is sown from 23 April to 9 July. Within 15 km of Namur OpenStreetMap lists 14 garden centres, 2 plant nurseries, 3 markets and 11 farm shops (collected 27 October 2026).

Oh! Green — garden centre
7 km
Crahay Green Escape — garden centre
8 km
Paquet — garden centre
11 km
Pépinière de Belu — plant nursery
14 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.

Questions