Climate averages 1991–2020
Harrow weather
in March.
A cool, moderately wet month: the joint 8th warmest and the driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
March is a cool month in Harrow: daytime highs average 10.0°C and nights cool to about 3.4°C. By daytime temperature it is the joint 8th warmest of the 12 months.
Expect about 42 mm of rain on roughly 10 days, which makes March a moderately wet month (the driest month of the year). Daylight, from sunrise to sunset, lasts about 11 h 50 min on an average March day.
The nearest other city in this atlas is Hayes (9 km away). In March its highs average 10.1°C, about as warm as Harrow, with 43 mm of rain.
Among the 143 cities listed in the United Kingdom, Harrow ranks joint 35th of 143 for the warmest March highs and joint 11th of 143 for the driest March (rainfall, lowest first). The mean March high of those 143 cities is 9.5°C; Harrow is 0.5°C warmer than that mean.
From March to April, average highs rise by 2.9°C to 13.0°C, and monthly rainfall rises from 42 mm to 49 mm.
The annual picture
March 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
Harrow 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 | 55 | 10.9 | 8.48 h |
| February | 7.6°C2.2°C | 2.2°C | 45 | 9.4 | 9.910 h |
| March, selected | 10.0°C3.4°C | 3.4°C | 42 | 10.2 | 11.812 h |
| April | 13.0°C5.1°C | 5.1°C | 49 | 10.9 | 13.814 h |
| May | 16.1°C8.2°C | 8.2°C | 52 | 9.8 | 15.616 h |
| June | 19.0°C11.2°C | 11.2°C | 56 | 10.0 | 16.617 h |
| July | 21.2°C13.4°C | 13.4°C | 54 | 10.6 | 16.116 h |
| August | 20.8°C13.3°C | 13.3°C | 61 | 10.2 | 14.615 h |
| September | 18.1°C11.1°C | 11.1°C | 47 | 9.0 | 12.713 h |
| October | 14.2°C8.4°C | 8.4°C | 58 | 11.2 | 10.711 h |
| November | 10.0°C5.1°C | 5.1°C | 63 | 11.0 | 8.99 h |
| December | 7.4°C2.9°C | 2.9°C | 58 | 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
March in nearby cities
- Hayes in MarchUnited Kingdom · 9 kmHigh 10.1°C · Low 3.4°C · 43 mm rain
- Watford in MarchUnited Kingdom · 10 kmHigh 10.0°C · Low 3.4°C · 44 mm rain
- Uxbridge in MarchUnited Kingdom · 11 kmHigh 10.1°C · Low 3.4°C · 43 mm rain
- Archway in MarchUnited Kingdom · 14 kmHigh 10.1°C · Low 3.3°C · 42 mm rain
- Fulham in MarchUnited Kingdom · 14 kmHigh 10.5°C · Low 3.4°C · 42 mm rain
- London in MarchUnited Kingdom · 16 kmHigh 10.4°C · Low 3.2°C · 42 mm rain
- Enfield Town in MarchUnited Kingdom · 19 kmHigh 10.2°C · Low 3.5°C · 42 mm rain
- St Albans in MarchUnited Kingdom · 19 kmHigh 9.8°C · Low 3.2°C · 43 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 Harrow) is explained once on the Harrow year overview and on the Sources, method and limits page.
London, Archway and Fulham lie in the same rainfall cell, so their rainfall figures are identical to these; temperatures differ because they come from smaller 0.1° cells.