Current Conditions

Harpenden, England

92°F33°C

Hot

Wind

SE 5 mph8 km/h

Humidity

22%

Cloud Cover

As of Thursday, August 13, 2026 at 11:40 AM GMT+1

Today's Outlook

Day

Mostly clear and hot, with a high of 95°F35°C and morning low of 66°F19°C. Light wind from the SE around 5 mph8 km/h. Heat risk in the afternoon.

Night

Mostly clear, with a low around 79°F26°C. Breezy from the S at 7 mph11 km/h.

7-Day Forecast

Condition	High (°F)	Low (°F)	Precip (mm)	Cloud Cover (%)	Wind (mph)
Hot	High 95°F35°C	Low 66°F19°C	Precip 0 in0 mm—	Cloud 5%	Wind SSE 6 mph9 km/h	Thursday: Mostly clear and hot, with a high of 95°F35°C and morning low of 66°F19°C. Light wind from the SE around 5 mph8 km/h. Heat risk in the afternoon. Thursday Night: Mostly clear, with a low around 79°F26°C. Breezy from the S at 7 mph11 km/h.
Partly Cloudy	High 89°F32°C	Low 68°F20°C	Precip 0 in0 mm—	Cloud 44%	Wind NW 6 mph9 km/h	Friday: Partly cloudy and hot, with a high of 89°F32°C and morning low of 68°F20°C. Light wind from the NW around 6 mph9 km/h. Friday Night: Partly cloudy, with a low around 68°F20°C. Light wind from the WNW around 5 mph9 km/h.
Drizzle	High 76°F25°C	Low 65°F18°C	Precip 0.04 in1.1 mm19%	Cloud 71%	Wind N 8 mph13 km/h	Saturday: Mostly cloudy and warm, with a high of 76°F25°C and morning low of 65°F18°C. Breezy from the N at 8 to 9 mph14 to 15 km/h. 19% chance of drizzle throughout the day. Saturday Night: Mostly cloudy, with a low around 67°F19°C. Breezy from the N at 8 mph12 km/h. 15% chance of drizzle before dawn.
Drizzle	High 74°F23°C	Low 60°F15°C	Precip 0.02 in0.6 mm10%	Cloud 75%	Wind NNW 6 mph9 km/h	Sunday: Overcast and warm, with a high of 74°F23°C and morning low of 60°F15°C. Light wind from the NNW around 5 mph9 km/h. Sunday Night: Mostly cloudy, with a low around 60°F16°C. Breezy from the N at 6 to 7 mph10 to 11 km/h. 10% chance of drizzle overnight.
Drizzle	High 74°F23°C	Low 59°F15°C	Precip 0.04 in0.9 mm18%	Cloud 78%	Wind NNW 6 mph9 km/h	Monday: Mostly cloudy and warm, with a high of 74°F23°C and morning low of 60°F15°C. Breezy from the NNW at 6 to 7 mph9 to 11 km/h. Monday Night: Mostly cloudy, with a low around 59°F15°C. Light wind from the NW around 6 mph9 km/h. 18% chance of drizzle overnight.
Light Rain	High 74°F23°C	Low 63°F17°C	Precip 0.11 in2.8 mm37%	Cloud 81%	Wind W 9 mph15 km/h	Tuesday: Overcast and warm, with a high of 74°F23°C and morning low of 64°F18°C. Breezy from the W at 10 to 11 mph16 to 18 km/h. 37% chance of light rain throughout the day. Tuesday Night: Mostly cloudy, with a low around 63°F17°C. Breezy from the W at 8 to 10 mph13 to 16 km/h. 30% chance of drizzle throughout the night.
Drizzle	High 74°F23°C	Low 62°F17°C	Precip 0.08 in2 mm27%	Cloud 63%	Wind W 9 mph15 km/h	Wednesday: Mostly cloudy and warm, with a high of 74°F23°C and morning low of 62°F17°C. Breezy from the W at 10 to 11 mph16 to 17 km/h. 27% chance of drizzle throughout the day. Wednesday Night: Mostly cloudy, with a low around 62°F17°C. Breezy from the W at 8 to 9 mph13 to 14 km/h. 17% chance of drizzle throughout the night.

15-Day Forecast

	Day	High	Low	Precip	Cloud Cover	Condition	Wind
	ThursdayAug 13	95°F35°C	66°F19°C	0 in0 mm· —	5%	Hot	SSE 6 mph9 km/h
DayMostly clear and hot, with a high of 95°F35°C and morning low of 66°F19°C. Light wind from the SE around 5 mph8 km/h. Heat risk in the afternoon. NightMostly clear, with a low around 79°F26°C. Breezy from the S at 7 mph11 km/h.
	FridayAug 14	89°F32°C	68°F20°C	0 in0 mm· —	44%	Partly Cloudy	NW 6 mph9 km/h
DayPartly cloudy and hot, with a high of 89°F32°C and morning low of 68°F20°C. Light wind from the NW around 6 mph9 km/h. NightPartly cloudy, with a low around 68°F20°C. Light wind from the WNW around 5 mph9 km/h.
	SaturdayAug 15	76°F25°C	65°F18°C	0.04 in1.1 mm· 19%	71%	Drizzle	N 8 mph13 km/h
DayMostly cloudy and warm, with a high of 76°F25°C and morning low of 65°F18°C. Breezy from the N at 8 to 9 mph14 to 15 km/h. 19% chance of drizzle throughout the day. NightMostly cloudy, with a low around 67°F19°C. Breezy from the N at 8 mph12 km/h. 15% chance of drizzle before dawn.
	SundayAug 16	74°F23°C	60°F15°C	0.02 in0.6 mm· 10%	75%	Drizzle	NNW 6 mph9 km/h
DayOvercast and warm, with a high of 74°F23°C and morning low of 60°F15°C. Light wind from the NNW around 5 mph9 km/h. NightMostly cloudy, with a low around 60°F16°C. Breezy from the N at 6 to 7 mph10 to 11 km/h. 10% chance of drizzle overnight.
	MondayAug 17	74°F23°C	59°F15°C	0.04 in0.9 mm· 18%	78%	Drizzle	NNW 6 mph9 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 60°F15°C. Breezy from the NNW at 6 to 7 mph9 to 11 km/h. NightMostly cloudy, with a low around 59°F15°C. Light wind from the NW around 6 mph9 km/h. 18% chance of drizzle overnight.
	TuesdayAug 18	74°F23°C	63°F17°C	0.11 in2.8 mm· 37%	81%	Light Rain	W 9 mph15 km/h
DayOvercast and warm, with a high of 74°F23°C and morning low of 64°F18°C. Breezy from the W at 10 to 11 mph16 to 18 km/h. 37% chance of light rain throughout the day. NightMostly cloudy, with a low around 63°F17°C. Breezy from the W at 8 to 10 mph13 to 16 km/h. 30% chance of drizzle throughout the night.
	WednesdayAug 19	74°F23°C	62°F17°C	0.08 in2 mm· 27%	63%	Drizzle	W 9 mph15 km/h
DayMostly cloudy and warm, with a high of 74°F23°C and morning low of 62°F17°C. Breezy from the W at 10 to 11 mph16 to 17 km/h. 27% chance of drizzle throughout the day. NightMostly cloudy, with a low around 62°F17°C. Breezy from the W at 8 to 9 mph13 to 14 km/h. 17% chance of drizzle throughout the night.
	ThursdayAug 20	70°F21°C	59°F15°C	0.15 in3.8 mm· 30%	67%	Showers	W 8 mph13 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 59°F15°C. Breezy from the W at 9 to 10 mph14 to 16 km/h. 29% chance of light rain throughout the day. NightMostly cloudy, with a low around 59°F15°C. Breezy from the W at 7 to 9 mph12 to 14 km/h. 30% chance of showers throughout the night.
	FridayAug 21	69°F21°C	56°F13°C	0.1 in2.5 mm· 28%	63%	Showers	W 8 mph13 km/h
DayMostly cloudy and warm, with a high of 69°F21°C and morning low of 56°F13°C. Breezy from the W at 9 to 10 mph14 to 16 km/h. 26% chance of drizzle throughout the day. NightMostly cloudy, with a low around 56°F13°C. Breezy from the WNW at 7 to 9 mph12 to 14 km/h. 28% chance of showers throughout the night.
	SaturdayAug 22	69°F20°C	55°F13°C	0.11 in2.7 mm· 32%	65%	Showers	W 8 mph13 km/h
DayMostly cloudy and warm, with a high of 69°F20°C and morning low of 55°F13°C. Breezy from the W at 8 to 9 mph14 to 15 km/h. 24% chance of drizzle throughout the day. NightMostly cloudy, with a low around 55°F13°C. Breezy from the W at 7 to 8 mph12 to 13 km/h. 32% chance of showers throughout the night.
	SundayAug 23	69°F21°C	55°F13°C	0.13 in3.2 mm· 29%	68%	Showers	SW 8 mph14 km/h
DayMostly cloudy and warm, with a high of 69°F21°C and morning low of 56°F13°C. Breezy from the SW at 9 to 10 mph15 to 16 km/h. 28% chance of light rain throughout the day. NightMostly cloudy, with a low around 55°F13°C. Breezy from the SSW at 8 to 9 mph13 to 14 km/h. 29% chance of drizzle throughout the night.
	MondayAug 24	70°F21°C	56°F13°C	0.11 in2.8 mm· 28%	65%	Showers	SW 9 mph14 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 56°F14°C. Breezy from the SW at 9 to 10 mph15 to 17 km/h. 28% chance of showers throughout the day. NightMostly cloudy, with a low around 56°F13°C. Breezy from the SW at 8 to 9 mph13 to 14 km/h. 26% chance of drizzle throughout the night.
	TuesdayAug 25	70°F21°C	57°F14°C	0.12 in3 mm· 24%	71%	Drizzle	SW 9 mph14 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 57°F14°C. Breezy from the SW at 9 to 10 mph15 to 16 km/h. 24% chance of drizzle throughout the day. NightMostly cloudy, with a low around 57°F14°C. Breezy from the SW at 8 mph13 km/h. 21% chance of drizzle throughout the night.
	WednesdayAug 26	70°F21°C	57°F14°C	0.11 in2.7 mm· 29%	69%	Drizzle	SW 9 mph14 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 57°F14°C. Breezy from the WSW at 9 to 10 mph15 to 16 km/h. 29% chance of drizzle throughout the day. NightMostly cloudy, with a low around 57°F14°C. Breezy from the SW at 8 to 9 mph13 to 14 km/h. 25% chance of drizzle throughout the night.
	ThursdayAug 27	70°F21°C	56°F13°C	0.12 in3 mm· 25%	65%	Drizzle	WSW 9 mph15 km/h
DayMostly cloudy and warm, with a high of 70°F21°C and morning low of 56°F13°C. Breezy from the WSW at 10 to 11 mph16 to 18 km/h. 25% chance of drizzle throughout the day. NightMostly cloudy, with a low around 56°F13°C. Breezy from the WSW at 8 to 9 mph13 to 15 km/h. 22% chance of drizzle throughout the night.

Nearby Cities

St Albans5 mi8 km Luton5 mi8 km Hemel Hempstead6 mi9 km Welwyn Garden City6 mi10 km Hatfield7 mi11 km Dunstable9 mi14 km

About This Forecast

This forecast is powered by WeatherMesh, the world's most advanced and accurate weather model powered by AI. WeatherMesh is built on proprietary data from WindBorne's Global Sounding Balloon constellation — the world's largest fleet of autonomous, long-duration weather balloons — collecting observations across 100% of Earth, including over oceans and remote regions where no other data exists.

WeatherMesh consistently outperforms legacy models in independent benchmarks. View Benchmarks →

Access WeatherMesh forecasts programmatically via our API. API Documentation →

How to Access Weather Forecasts

Pattern	Example	Description
/weather/{country}/{city}/	/weather/united-states/san-francisco/	City forecast (canonical URL)
/weather/{city}/	/weather/tokyo/	Shorthand — redirects to most populous match
/weather/{country}/{region}/{city}/	/weather/united-states/california/san-francisco/	With region — redirects to canonical
/weather/nearby?lat={lat}&lon={lon}	/weather/nearby?lat=48.1&lon=11.5	Find nearest city by coordinates
/weather/{country}/	/weather/germany/	Country index — all cities by region

Country and city names use lowercase slugs with hyphens (e.g. united-states, san-francisco). Arbitrary city names are supported — if not in our database, we geocode the name and serve the forecast for that location.

For programmatic access, use theWindBorne Forecast APIwhich returns structured JSON for any coordinates worldwide.

Coordinates: 51.8168°N, 0.3571°W·Elevation: 107m·Timezone: Europe/London·Population: 30,674