Year-round weather and climate in Harrow, United Kingdom
Average temperatures in Harrow run from an average low of 2°C36°F in January up to an average high of 23°C73°F in August. June is the driest month at 7 rainy days; March the wettest at 15 rainy days. Here is the annual climate data, so you know what you are packing for.
Good to know
- Population
- 149K
- Currency
- GBP
- Language
- English
- Time zone
- London
Best time to visit
The most pleasant weather falls in June, July, and August, offering a perfect balance of comfortable temperatures and clear skies.
Rain character
Moderate Showers: Rainfall is standard and manageable. A compact travel umbrella or light rain jacket will easily get you through any wet days.
Day-to-night swing
Evening Chill: Temperatures drop by a noticeable <span class="val-c">10°C</span><span class="val-f">18°F</span> when the sun goes down. A light sweater or jacket is usually all you need for evening plans.
Seasonality Profile
Temperate Year-Round: A relatively mild climate year-round, avoiding both extreme temperature swings and dramatic dry/wet seasons.
Evening vibe
Cozy Indoor Culture: Evenings are generally crisp, damp, or sweltering. Nightlife centers around indoor venues.
Sightseeing stamina
All-Day Strolling: Weather is generally forgiving for long walking days. Comfortable sneakers are your most important packing item.
Average temperatures, sunshine, and rainfall
Average monthly weather in Harrow, based on recent historical data. Essential insights on temperature swings, expected rainfall, and daily sunshine.
Bars span the average daily low to high. Jun is typically driest at 7 rainy days (32mm); Mar the wettest at 15 rainy days (72mm).
| Month | Average high | Average low | Daily sunshine | Rainy days | Total rainfall |
|---|---|---|---|---|---|
| Jan | 7°C / 45°F | 2°C / 35°F | 4h | 12 | 77mm |
| Feb | 10°C / 49°F | 4°C / 38°F | 4h | 12 | 63mm |
| Mar | 11°C / 53°F | 4°C / 40°F | 7h | 15 | 72mm |
| Apr | 15°C / 58°F | 6°C / 43°F | 9h | 12 | 55mm |
| May | 18°C / 65°F | 9°C / 49°F | 10h | 9 | 53mm |
| Jun | 22°C / 72°F | 12°C / 54°F | 13h | 7 | 32mm |
| Jul | 22°C / 72°F | 14°C / 57°F | 11h | 14 | 97mm |
| Aug | 23°C / 73°F | 14°C / 56°F | 10h | 8 | 52mm |
| Sep | 20°C / 68°F | 12°C / 54°F | 9h | 14 | 98mm |
| Oct | 16°C / 60°F | 9°C / 49°F | 6h | 12 | 85mm |
| Nov | 11°C / 51°F | 6°C / 42°F | 4h | 12 | 82mm |
| Dec | 9°C / 49°F | 5°C / 41°F | 3h | 12 | 70mm |
Weather data by Open-Meteo.com (opens in a new tab)
Frequently Asked Questions
When is the sunniest time of year to visit Harrow?
June is the sunniest month in Harrow, averaging 13 hours of sunshine a day. Pack sunglasses and high-SPF sunscreen.
What clothes should I pack for Harrow?
Your packing list depends entirely on when you travel. Temperatures in Harrow swing from an average low of 2°C36°F in January up to 23°C73°F in August. The Packola app builds a tailored packing list for you based on the live weather forecast for your exact travel dates.
Do I need to pack an umbrella for Harrow?
Harrow gets rain on about 139 days a year, with March being the wettest. If you're traveling then, pack an umbrella and a light rain jacket.
Pack smarter.
Averages get you close, but the week you travel is what matters. Get the live forecast, a smart packing list, and discover the best local spots and activities in Harrow with Packola.
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