Belfast, Northern Ireland
Best weekend slot
Saturday 8am–9pm
Verdict: Good
no rain since Friday, ground firm
Next mow
Tomorrow 10am–midday
Verdict: Good
grass dry — rain earlier today
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
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 |
What this means right now
Good: Seeding window open
Seeding conditions are open — soil is 14.1°C at 6cm and holding above 9°C.
Forecast from Open-Meteo, refreshed hourly. Soil temperature is modelled, not measured — how that works and where the thresholds come from.