London, England
Best weekend slot
Saturday 8am–8pm
Verdict: Good
rain earlier today, ground firm
Next mow
Today 8am–4pm
Verdict: Good
no rain since Monday, ground firm
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 18.0°C cooling to 15.5°C
Wednesday 2 September: Good. 8am–4pm — no rain since Monday, ground firm
Wednesday 2 September · 8am–4pmConfident
8am–4pm — no rain since Monday, ground firm
- Good:Grass wetness
- Grass dryno rain since Monday
- Good:Ground firmness
- Ground firm11mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.99
- Good:Temperature
- Temperature17°C
- Good:Wind
- Wind light8 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Thursday 3 September: Good. 8am–8pm — rain earlier today, ground firm
Thursday 3 September · 8am–8pmConfident
8am–8pm — rain earlier today, ground firm
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm11mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.95
- Good:Temperature
- Temperature19°C
- Good:Wind
- Wind light13 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Friday 4 September: Good. 8am–11am — no rain since Wednesday, ground firm
Friday 4 September · 8am–11amConfident
8am–11am — no rain since Wednesday, ground firm
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground firm6mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.99
- Good:Temperature
- Temperature20°C
- Good:Wind
- Wind light21 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Saturday 5 September: Good. 8am–8pm — rain earlier today, ground firm
Saturday 5 September · 8am–8pmConfident
8am–8pm — rain earlier today, ground firm
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm6mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.98
- Good:Temperature
- Temperature15°C
- Good:Wind
- Wind light7 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Sunday 6 September: Good. 10am–8pm — no rain since Friday, ground firm
Sunday 6 September · 10am–8pmReasonably confident
10am–8pm — no rain since Friday, ground firm
- Good:Grass wetness
- Grass dryno rain since Friday
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.97
- Good:Temperature
- Temperature18°C
- Good:Wind
- Wind light6 km/h
- Sociable hours
- Fine by the neighboursstarts when it stops being antisocial
Limiting factor:none
Monday 7 September: Good. 8am–8pm — no rain since Friday, ground firm
Monday 7 September · 8am–8pmReasonably confident
8am–8pm — no rain since Friday, ground firm
- Good:Grass wetness
- Grass dryno rain since Friday
- Good:Ground firmness
- Ground firm3mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.97
- Good:Temperature
- Temperature16°C
- Good:Wind
- Wind light13 km/h
- Sociable hours
- A bit early or late, but finestarts when it stops being antisocial
Limiting factor:none
Tuesday 8 September: Good. 8am–2pm — dried off since a shower 1 hour ago, ground firm
Tuesday 8 September · 8am–2pmReasonably confident
8am–2pm — dried off since a shower 1 hour ago, ground firm
- Marginal:Grass wetness
- Grass drydried off since a shower 0 hours ago
- Good:Ground firmness
- Ground firm1mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.82
- Good:Temperature
- Temperature16°C
- Good:Wind
- Wind light13 km/h
- Sociable hours
- A bit early or late, but finestarts once the rain has passed
Limiting factor:none
Wednesday 9 September: Good. 2pm–8pm — grass dry — dried off since a shower 2 hours ago
Wednesday 9 September · 2pm–8pmReasonably confident
2pm–8pm — grass dry — dried off since a shower 2 hours ago
- Poor:Grass wetness
- Grass drydried off since a shower 2 hours ago
- Good:Ground firmness
- Ground firm15mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.64
- Good:Temperature
- Temperature14°C
- Good:Wind
- Wind light21 km/h
- Sociable hours
- Fine by the neighboursstarts once the rain has passed
Limiting factor:grass wetness
Thursday 10 September: Good. 8am–8pm — grass dry — rain earlier today
Thursday 10 September · 8am–8pmLow confidence this far out
8am–8pm — grass dry — rain earlier today
- Good:Grass wetness
- Grass dryrain earlier today
- Good:Ground firmness
- Ground firm18mm rain over the last week
- Good:Growth
- Growing steadilygrowth potential 0.37
- Good:Temperature
- Temperature10°C
- Good:Wind
- Wind light3 km/h
- Sociable hours
- A bit early or late, but finestarts once the dew has burnt off
Limiting factor:grass wetness
Friday 11 September: Good. 8am–8pm — no rain since Wednesday, ground firm
Friday 11 September · 8am–8pmLow confidence this far out
8am–8pm — no rain since Wednesday, ground firm
- Good:Grass wetness
- Grass dryno rain since Wednesday
- Good:Ground firmness
- Ground firm18mm rain over the last week
- Good:Growth
- Growing wellgrowth potential 0.58
- Good:Temperature
- Temperature11°C
- Good:Wind
- Wind light6 km/h
- Sociable hours
- A bit early or late, but finestarts once the dew has burnt off
Limiting factor:none
Soil temperature
16.4°C62°F
at 6cm — germination depth
Cooling over the next 11 days.
Seeding conditions are open — soil is 16.4°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 16.4°C at 6cm and holding above 9°C.
Warning: Heat stress
Thursday 3 September gets hot enough to stress the sward. Mow early or late, and raise the height.
Forecast from Open-Meteo, refreshed hourly. Soil temperature is modelled, not measured — how that works and where the thresholds come from.