GreenlyWhen to plant watermelons in Santarém: from 6 May
In Santarém, watermelon: sow for seedlings from 18 March; plant into a greenhouse from 15 April; plant out into open ground from 6 May. There is no autumn frost here, so the frost dates set no end to the window. For plants and seeds, the places nearby include Agriloja (farm supply, 7 km); addresses and opening hours are below.
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Watermelon in Santarém: soil, season and weather
In Santarém the soil, not frost, sets the date: the last frost is over around 15 January, but the top 7 cm of soil reaches 18 °C — the minimum on the watermelon card — only around 6 May, 111 days later. Santarém has no autumn frost in the median year, so frost does not end the season.
| Last spring frost | 15 January |
|---|---|
| Top 7 cm of soil at 18 °C | 6 May, 111 days after the last frost |
| Into an unheated greenhouse | from 15 April; April outside: 10.7 °C at night, 20.5 °C by day; card 18–35 °C |
| Days in the bed to the first harvest (card) | 59 |
| First harvest, if planted in this window | from 4 July |
| Daylight | 12:55 on 8 April, 14:01 on 6 May |
| Watering outdoors when fruiting (card) | every 5 days; the driest month, August, has 1 rainy day |
The same dates in Santarém hold for Cucumber, Bell Pepper, Eggplant, Zucchini and Pumpkin.
Watermelon in Santarém: care after planting
Planted on 6 May: in the first weeks water every 5 days.
Feeding, by the card’s schedule from that day:
- 6 May — 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 Santarém during the watermelon season
No month of the season averages above the watermelon card's 18–35 °C by day; the warmest, August, averages 30.9 °C. Nights average below 18 °C in May–July and September, October (13.3–17.6 °C).
| Month | Day, °C | Night, °C | Rain, mm | Rainy days | Daylight on the 15th |
|---|---|---|---|---|---|
| May | 24.2 | 13.3 | 44 | 6 | 14:19 |
| June | 26.7 | 15.7 | 21 | 5 | 14:55 |
| July | 30.2 | 17.6 | 4 | 1 | 14:41 |
| August | 30.9 | 18 | 3 | 1 | 13:44 |
| September | 28.1 | 16.6 | 33 | 4 | 12:29 |
| October | 24.5 | 14.5 | 79 | 9 | 11:13 |
ERA5 2016–2025, Open-Meteo
Watermelon in nearby cities
Around Santarém, Beja is 19 days earlier and Leiria 6 days later.
Where to buy watermelon plants and seeds near Santarém
Buy plants ready to set out from 6 May (from 15 April for an unheated greenhouse); seed for raising your own is sown from 18 March. Within 15 km of Santarém OpenStreetMap lists 3 farm-supply shops and 8 markets (collected 27 October 2026).
- Agriloja — farm supply
Mon–Sat 08:30–19:30; public holidays 09:00–18:00 · 7 km · agriloja.pt - Mercado Municipal de Santarém — market
1 km - Mercado de Almeirim — market
6 km - Mercado Municipal — market
10 km
Places: © OpenStreetMap contributors, ODbL.
- How to grow watermelon
- All frost dates and weather of Santarém
- Shops and markets: Santarém
- Selling a surplus in Portugal
- Moon planting calendar for November 2026
- How we calculate the dates
Questions
When to plant watermelons in Santarém?
In Santarém, watermelon: sow for seedlings from 18 March; plant into a greenhouse from 15 April; plant out into open ground from 6 May. There is no autumn frost here, so the frost dates set no end to the window.
When to sow watermelons for seedlings in Santarém?
Sow for seedlings from 18 March.
