Soil temperature in Belfast, Northern Ireland
Soil temperature
14.1°C57°F
at 6cm — germination depth
Cooling over the next 11 days.
Seeding conditions are open — soil is 14.1°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 Belfast, Northern Ireland is currently 14.1°C, and falling about 2.0°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 14.1°C at 6cm and holding above 9°C.
8 of the next 10 days are good mowing days. The best weekend slot right now is Saturday 8am–9pm, on the basis that no rain since Friday, ground firm.
The next recommended window in Belfast opens at 1pm on Thursday 3 September, because the rain clears by then. Underfoot, the ground reads as firm after 25mm 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 16.3°C cooling to 13.0°C
Wednesday 2 September: Good. No — 0.4mm of rain falling.
Wednesday 2 SeptemberConfident
No — 0.4mm of rain falling.
- Poor:Grass wetness
- Grass wetraining now
- Good:Ground firmness
- Ground firm25mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.84
- Good:Temperature
- Temperature15°C
- Good:Wind
- Wind light5 km/h
Limiting factor:grass wetness
Thursday 3 September: Good. 1pm–3pm — dried off since a shower 2 hours ago, ground firm
Thursday 3 September · 1pm–3pmConfident
1pm–3pm — dried off since a shower 2 hours ago, ground firm
- Marginal:Grass wetness
- Grass drydried off since a shower 2 hours ago
- Good:Ground firmness
- Ground firm27mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.84
- Good:Temperature
- Temperature16°C
- Good:Wind
- Wind light12 km/h
- Sociable hours
- Fine by the neighboursstarts once the rain has passed
Limiting factor:none
Friday 4 September: Good. midday–9pm — wind light — 21 km/h
Friday 4 September · midday–9pmConfident
midday–9pm — wind light — 21 km/h
- Marginal:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm28mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.68
- Good:Temperature
- Temperature13°C
- Good:Wind
- Wind light18 km/h
- Sociable hours
- Fine by the neighboursstarts once the dew has burnt off
Limiting factor:wind
Saturday 5 September: Good. 8am–9pm — no rain since Friday, ground firm
Saturday 5 September · 8am–9pmConfident
8am–9pm — no rain since Friday, ground firm
- Good:Grass wetness
- Grass dryno rain since Friday
- Good:Ground firmness
- Ground firm20mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.57
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light12 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Sunday 6 September: Not worth it. No — 1.7mm of rain falling.
Sunday 6 SeptemberReasonably confident
No — 1.7mm of rain falling.
- Poor:Grass wetness
- Grass wetraining now
- Good:Ground firmness
- Ground firm14mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.81
- Good:Temperature
- Temperature17°C
- Good:Wind
- Wind light17 km/h
Limiting factor:grass wetness
Monday 7 September: Good. 8am–11am — rain earlier today, ground firm
Monday 7 September · 8am–11amReasonably confident
8am–11am — rain earlier today, ground firm
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm31mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.60
- Good:Temperature
- Temperature12°C
- Good:Wind
- Wind light18 km/h
- Sociable hours
- A bit early or late, but finestarts once the dew has burnt off
Limiting factor:none
Tuesday 8 September: Good. 8am–11am — rain earlier today, ground soft in places
Tuesday 8 September · 8am–11amReasonably confident
8am–11am — rain earlier today, ground soft in places
- Marginal:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground soft in places33mm rain over the last week
- Good:Growth
- Growing steadilygrowth potential 0.40
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light17 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Wednesday 9 September: Good. 11am–8pm — growing slowly — growth potential 0.32
Wednesday 9 September · 11am–8pmReasonably confident
11am–8pm — growing slowly — growth potential 0.32
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm36mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.32
- Good:Temperature
- Temperature10°C
- Good:Wind
- Wind light21 km/h
- Sociable hours
- Fine by the neighboursstarts once the dew has burnt off
Limiting factor:growth
Thursday 10 September: Good. 8am–8pm — growing slowly — growth potential 0.26
Thursday 10 September · 8am–8pmLow confidence this far out
8am–8pm — growing slowly — growth potential 0.26
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground firm34mm rain over the last week
- Marginal:Growth
- Growing slowlygrowth potential 0.26
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light9 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:growth
Friday 11 September: Not worth it. No — 0.1mm of rain falling.
Friday 11 SeptemberLow confidence this far out
No — 0.1mm of rain falling.
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground firm29mm rain over the last week
- Good:Growth
- Growing steadilygrowth potential 0.39
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light5 km/h
Limiting factor:none
Nearby
Your own postcode
These are town-centre figures. Yours will differ a little.