Climate averages 1991–2020
Hemel Hempstead weather
in July.
A mild, moderately wet month: the warmest and the joint 8th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
July is a mild month in Hemel Hempstead: daytime highs average 20.7°C and nights cool to about 12.9°C. By daytime temperature it is the warmest month of the year.
Expect about 58 mm of rain on roughly 11 days, which makes July a moderately wet month (the joint 8th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 16 h 11 min on an average July day.
The nearest other city in this atlas is St Albans (8 km away). In July its highs average 21.0°C, about as warm as Hemel Hempstead, with 57 mm of rain.
Among the 143 cities listed in the United Kingdom, Hemel Hempstead ranks joint 49th of 143 for the warmest July highs and joint 38th of 143 for the driest July (rainfall, lowest first). The mean July high of those 143 cities is 20.0°C; Hemel Hempstead is 0.8°C warmer than that mean.
From July to August, average highs fall by 0.3°C to 20.4°C, and monthly rainfall rises from 58 mm to 62 mm.
The annual picture
July 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
Hemel Hempstead climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 6.6°C1.9°C | 1.9°C | 54 | 11.2 | 8.48 h |
| February | 7.2°C1.7°C | 1.7°C | 45 | 9.9 | 9.910 h |
| March | 9.6°C2.9°C | 2.9°C | 44 | 10.3 | 11.812 h |
| April | 12.5°C4.6°C | 4.6°C | 50 | 11.4 | 13.814 h |
| May | 15.6°C7.7°C | 7.7°C | 56 | 10.5 | 15.616 h |
| June | 18.5°C10.7°C | 10.7°C | 58 | 10.5 | 16.617 h |
| July, selected | 20.7°C12.9°C | 12.9°C | 58 | 11.2 | 16.216 h |
| August | 20.4°C12.8°C | 12.8°C | 62 | 10.7 | 14.615 h |
| September | 17.7°C10.7°C | 10.7°C | 51 | 9.4 | 12.713 h |
| October | 13.7°C8.0°C | 8.0°C | 60 | 11.3 | 10.711 h |
| November | 9.6°C4.6°C | 4.6°C | 62 | 11.2 | 8.99 h |
| December | 6.9°C2.5°C | 2.5°C | 57 | 11.2 | 7.98 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
July in nearby cities
- St Albans in JulyUnited Kingdom · 8 kmHigh 21.0°C · Low 13.1°C · 57 mm rain
- Watford in JulyUnited Kingdom · 12 kmHigh 21.1°C · Low 13.3°C · 58 mm rain
- Luton in JulyUnited Kingdom · 14 kmHigh 21.0°C · Low 12.9°C · 60 mm rain
- Harrow in JulyUnited Kingdom · 21 kmHigh 21.2°C · Low 13.4°C · 54 mm rain
- Uxbridge in JulyUnited Kingdom · 23 kmHigh 21.2°C · Low 13.4°C · 53 mm rain
- Stevenage in JulyUnited Kingdom · 24 kmHigh 21.1°C · Low 13.0°C · 60 mm rain
- High Wycombe in JulyUnited Kingdom · 25 kmHigh 21.2°C · Low 13.1°C · 59 mm rain
- Aylesbury in JulyUnited Kingdom · 26 kmHigh 21.1°C · Low 12.9°C · 59 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 Hemel Hempstead) is explained once on the Hemel Hempstead year overview and on the Sources, method and limits page.
Watford lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.