Climate averages 1991–2020
St Helens weather
in August.
A mild, moderately wet month: the 2nd warmest and the 9th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
August is a mild month in St Helens: daytime highs average 18.7°C and nights cool to about 12.7°C. By daytime temperature it is the 2nd warmest of the 12 months.
Expect about 89 mm of rain on roughly 15 days, which makes August a moderately wet month (the 9th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 14 h 49 min on an average August day.
The nearest other city in this atlas is Warrington (12 km away). In August its highs average 18.9°C, about as warm as St Helens, with 89 mm of rain.
Among the 143 cities listed in the United Kingdom, St Helens ranks joint 111th of 143 for the warmest August highs and joint 123rd of 143 for the driest August (rainfall, lowest first). The mean August high of those 143 cities is 19.7°C; St Helens is 1.0°C cooler than that mean.
From August to September, average highs fall by 2.0°C to 16.6°C, and monthly rainfall falls from 89 mm to 78 mm.
The annual picture
August in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
St Helens climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.9°C2.6°C | 2.6°C | 79 | 15.0 | 8.18 h |
| February | 7.4°C2.4°C | 2.4°C | 68 | 13.2 | 9.810 h |
| March | 9.4°C3.3°C | 3.3°C | 67 | 13.0 | 11.812 h |
| April | 11.9°C4.9°C | 4.9°C | 64 | 12.5 | 14.014 h |
| May | 14.8°C7.8°C | 7.8°C | 66 | 12.6 | 15.916 h |
| June | 17.2°C10.7°C | 10.7°C | 79 | 13.3 | 16.917 h |
| July | 18.9°C12.7°C | 12.7°C | 80 | 14.9 | 16.516 h |
| August, selected | 18.7°C12.7°C | 12.7°C | 89 | 15.2 | 14.815 h |
| September | 16.6°C10.8°C | 10.8°C | 78 | 12.7 | 12.813 h |
| October | 13.3°C8.2°C | 8.2°C | 91 | 14.6 | 10.611 h |
| November | 9.6°C5.2°C | 5.2°C | 92 | 16.1 | 8.79 h |
| December | 7.2°C3.0°C | 3.0°C | 98 | 15.5 | 7.68 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
August in nearby cities
- Warrington in AugustUnited Kingdom · 12 kmHigh 18.9°C · Low 12.5°C · 89 mm rain
- Wigan in AugustUnited Kingdom · 12 kmHigh 18.7°C · Low 12.5°C · 89 mm rain
- Liverpool in AugustUnited Kingdom · 17 kmHigh 18.4°C · Low 13.3°C · 99 mm rain
- Bolton in AugustUnited Kingdom · 25 kmHigh 18.2°C · Low 11.8°C · 89 mm rain
- Southport in AugustUnited Kingdom · 28 kmHigh 18.2°C · Low 13.7°C · 117 mm rain
- Salford in AugustUnited Kingdom · 30 kmHigh 18.8°C · Low 11.9°C · 89 mm rain
- Chester in AugustUnited Kingdom · 31 kmHigh 19.2°C · Low 12.7°C · 80 mm rain
- Manchester in AugustUnited Kingdom · 33 kmHigh 18.8°C · Low 12.0°C · 89 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for St Helens) is explained once on the St Helens year overview and on the Sources, method and limits page.
Wigan lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.