Soil temperature in Swansea, Wales
Soil temperature
16.0°C61°F
at 6cm — germination depth
Cooling over the next 11 days.
Seeding conditions are open — soil is 16.0°C at 6cm and holding above 9°C.
Almost every UK and Irish lawn is a ryegrass and fescue mix, whether it was sown or turfed. We assume that, and use9°C as the seeding threshold.
I know what grass I have
The differences are small. Ryegrass is the quickest off the mark; bluegrass is the slowest and wants the warmest soil. Everything else sits between.
| Species | Soil temp | Days |
|---|---|---|
| Perennial ryegrasslikely yours | 8°C | 5–10 |
| Red / chewings fescuelikely yours | 8–10°C | 10–14 |
| Tall fescue | 10–12°C | 10–14 |
| Browntop bentColonial bentgrass | 10–12°C | 14–21 |
| Smooth-stalked meadow grassKentucky bluegrass | 12–13°C | 14–28 |
Soil temperature at 6cm in Swansea, Wales is currently 16.0°C, and falling about 2.1°C over the next 11 days. That depth matters because it is where grass seed sits and where roots start working, and it lags air temperature by days — which is why a warm afternoon here tells you very little on its own.
Lawns in this area are typically perennial ryegrass with fescue, which is what most lawns round here are sown with. That blend needs the soil to hold above 9°C before seed germinates reliably. Seeding conditions are open — soil is 16.0°C at 6cm and holding above 9°C.
7 of the next 10 days are good mowing days. The other 3 are held back by wet grass or soft ground. The best weekend slot right now is Saturday 8am–5pm, on the basis that ground soft — 59mm rain over the last week.
The next recommended window in Swansea opens at midday on Thursday 3 September, because that is when the dew has burnt off — earlier than that and you are cutting wet grass. Underfoot, the ground reads as soft after 59mm rain over the last week.
The next 10 days
Column height is how mowable the day is; the lighter band is the best stretch within it. The line is soil temperature at 6cm.
9°C — seeding
Soil at 6cm 17.3°C cooling to 15.0°C
Wednesday 2 September: Not worth it. No — 0.1mm of rain falling.
Wednesday 2 SeptemberConfident
No — 0.1mm of rain falling.
- Poor:Grass wetness
- Grass wetraining now
- Poor:Ground firmness
- Ground soft59mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.92
- Good:Temperature
- Temperature17°C
- Good:Wind
- Wind light19 km/h
Limiting factor:grass wetness
Thursday 3 September: Good. midday–8pm — grass dry — rain earlier today
Thursday 3 September · midday–8pmConfident
midday–8pm — grass dry — rain earlier today
- Marginal:Grass wetness
- Grass dryrain earlier today
- Poor:Ground firmness
- Ground soft72mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.98
- Good:Temperature
- Temperature18°C
- Good:Wind
- Wind light13 km/h
- Sociable hours
- Fine by the neighboursstarts once the dew has burnt off
Limiting factor:grass wetness
Friday 4 September: Good. No — 0.7mm of rain falling.
Friday 4 SeptemberConfident
No — 0.7mm of rain falling.
- Poor:Grass wetness
- Grass dryrain earlier today
- Poor:Ground firmness
- Ground soft67mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.90
- Good:Temperature
- Temperature16°C
- Good:Wind
- Wind light19 km/h
Limiting factor:ground firmness
Saturday 5 September: Good. 8am–5pm — ground soft — 59mm rain over the last week
Saturday 5 September · 8am–5pmConfident
8am–5pm — ground soft — 59mm rain over the last week
- Good:Grass wetness
- Grass dryno rain since Friday
- Marginal:Ground firmness
- Ground soft59mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.66
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light2 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:ground firmness
Sunday 6 September: Marginal. No — 0.1mm of rain falling.
Sunday 6 SeptemberReasonably confident
No — 0.1mm of rain falling.
- Poor:Grass wetness
- Grass drydried off since a shower 0 hours ago
- Marginal:Ground firmness
- Ground soft in places46mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.93
- Good:Temperature
- Temperature17°C
- Good:Wind
- Wind light10 km/h
Limiting factor:grass wetness
Monday 7 September: Good. 11am–8pm — grass dry — rain earlier today
Monday 7 September · 11am–8pmReasonably confident
11am–8pm — grass dry — rain earlier today
- Marginal:Grass wetness
- Grass dryrain earlier today
- Marginal:Ground firmness
- Ground soft in places36mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.74
- Good:Temperature
- Temperature12°C
- Good:Wind
- Wind light7 km/h
- Sociable hours
- Fine by the neighboursstarts once the dew has burnt off
Limiting factor:grass wetness
Tuesday 8 September: Not worth it. No — 0.2mm of rain falling.
Tuesday 8 SeptemberReasonably confident
No — 0.2mm of rain falling.
- Poor:Grass wetness
- Grass wetraining now
- Poor:Ground firmness
- Ground soft35mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.72
- Good:Temperature
- Temperature14°C
- Good:Wind
- Wind light9 km/h
Limiting factor:grass wetness
Wednesday 9 September: Good. No — 0.8mm of rain falling.
Wednesday 9 SeptemberReasonably confident
No — 0.8mm of rain falling.
- Marginal:Grass wetness
- Grass dryrain earlier today
- Poor:Ground firmness
- Ground saturated59mm rain over the last week
- Good:Growth
- Growing steadilygrowth potential 0.48
- Good:Temperature
- Temperature12°C
- Good:Wind
- Wind light20 km/h
Limiting factor:ground firmness
Thursday 10 September: Good. No — ground saturated, 50mm rain over the last week.
Thursday 10 SeptemberLow confidence this far out
No — ground saturated, 50mm rain over the last week.
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Poor:Ground firmness
- Ground saturated50mm rain over the last week
- Good:Growth
- Growing steadilygrowth potential 0.41
- Good:Temperature
- Temperature10°C
- Good:Wind
- Wind light3 km/h
Limiting factor:ground firmness
Friday 11 September: Good. 8am–8pm — ground soft — 49mm rain over the last week
Friday 11 September · 8am–8pmLow confidence this far out
8am–8pm — ground soft — 49mm rain over the last week
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Poor:Ground firmness
- Ground soft49mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.63
- Good:Temperature
- Temperature12°C
- Good:Wind
- Wind light16 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:ground firmness
Nearby
Your own postcode
These are town-centre figures. Yours will differ a little.