Climate averages 1991–2020
Watford 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 Watford: daytime highs average 21.1°C and nights cool to about 13.3°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 10 min on an average July day.
The nearest other city in this atlas is Harrow (10 km away). In July its highs average 21.2°C, about as warm as Watford, with 54 mm of rain.
Among the 143 cities listed in the United Kingdom, Watford ranks joint 30th 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; Watford is 1.1°C warmer than that mean.
From July to August, average highs fall by 0.3°C to 20.8°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
Watford climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 7.1°C2.3°C | 2.3°C | 54 | 11.2 | 8.48 h |
| February | 7.6°C2.2°C | 2.2°C | 45 | 9.9 | 9.910 h |
| March | 10.0°C3.4°C | 3.4°C | 44 | 10.3 | 11.812 h |
| April | 12.9°C5.1°C | 5.1°C | 50 | 11.4 | 13.814 h |
| May | 16.0°C8.1°C | 8.1°C | 56 | 10.5 | 15.616 h |
| June | 18.9°C11.1°C | 11.1°C | 58 | 10.5 | 16.617 h |
| July, selected | 21.1°C13.3°C | 13.3°C | 58 | 11.2 | 16.216 h |
| August | 20.8°C13.3°C | 13.3°C | 62 | 10.7 | 14.615 h |
| September | 18.1°C11.1°C | 11.1°C | 51 | 9.4 | 12.713 h |
| October | 14.2°C8.4°C | 8.4°C | 60 | 11.3 | 10.711 h |
| November | 10.0°C5.1°C | 5.1°C | 62 | 11.2 | 8.99 h |
| December | 7.4°C2.9°C | 2.9°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
- Harrow in JulyUnited Kingdom · 10 kmHigh 21.2°C · Low 13.4°C · 54 mm rain
- St Albans in JulyUnited Kingdom · 11 kmHigh 21.0°C · Low 13.1°C · 57 mm rain
- Hemel Hempstead in JulyUnited Kingdom · 12 kmHigh 20.7°C · Low 12.9°C · 58 mm rain
- Uxbridge in JulyUnited Kingdom · 13 kmHigh 21.2°C · Low 13.4°C · 53 mm rain
- Hayes in JulyUnited Kingdom · 16 kmHigh 21.3°C · Low 13.4°C · 53 mm rain
- Archway in JulyUnited Kingdom · 21 kmHigh 21.3°C · Low 13.4°C · 54 mm rain
- Slough in JulyUnited Kingdom · 21 kmHigh 21.4°C · Low 13.3°C · 53 mm rain
- Enfield Town in JulyUnited Kingdom · 21 kmHigh 21.5°C · Low 13.5°C · 58 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 Watford) is explained once on the Watford year overview and on the Sources, method and limits page.
Hemel Hempstead lies in the same rainfall cell, so its rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.