Hillview Weather

20°C

Harrow, UK

Updated: 18/08/2026 22:02

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Updated: @ 18/08/2026 22:02 - next update at 00:00

Summary / Temperature

Wind

Rain/Melted Snow

Cloud Level

RaspberryPi5 webcam Web camera

20.5°C

---

Feels like:
20.5°C

24-hr
difference
-2.6°C

LOCALLY:	Today	Yesterday
High:	26.0°C 14:43	29.1°C 14:48
Low:	17.5°C 04:49	16.2°C 06:39

	N 0 mph Gust: 0 mph
Calm
60-Min Avg:	0 mph
120-Min Avg:	0 mph
Max Gust:	15 mph 03:01
Month:	21 mph 4 Aug

Today:	0.0 mm
Yesterday:	0.0 mm
Last Rain:	30/7/2026 23:25
August:	0.0 mm
Last 7 Days:	0.0 mm
Rain Season:¹	344.3 mm
Rain Days:	86 in 2026
19 days since last rain.

Barometer ( hPa)

Humidity/Dew Point

Moon

Current:	1008.4 hPa
1-Hr Trend:	Steady
3-Hr Trend:	Steady
High: 1011.8 \| Low: 1008.0

Humidity:	72 %
Humidex:	24.6°C
Dew Point:	15.3°C
Wetbulb:	17.4°C

Waxing Crescent

38%
Illuminated

Current UV Index

Solar Information

0.0 None

High: 2.9 @ 14:21

Time to Burn: 720 Mins

Sunrise is at: 05:51:45

Sunhours Today: Hrs

Sunhours Month: 154:46 Hrs

Heat Index

Cooling Degree Days

Sun

Current:	20.5°C
Today:	26.0°C 14:43
Yesterday:	29.8°C
Last Week:	37.2°C
Record:	43.9°C 01/01/1970

Today:	1.6
August:	63.1
2026 to Date:	278.3
Heating Degree Days
2026 to Date:	1431.2

Daylight:

14 hr 27 min
^{3 min 39 sec Shorter
Than Yesterday}

Almanac

Irrigation Index⁵

Station All Time Records

Sunshine Hours⁶

Sunrise:	05:51
Sunset:	20:18
Moonrise:	13:07
Moonset:	21:46
Full Moon:	28 August 2026
New Moon:	03:28 UTC 11 September 2026

Updated at Midnight
Current:	2.10 mm
7-Days Rain:	0.00 mm
7-Days ET:	33.50 mm
7-Day:	-33.5 mm
August:	-84 mm
Outside Now
Air Density:	1.19 kg/m³

HIGHS:	LOWS:
39.6°C 19/07/2022	-10.7°C 12/11/2004
12 hr Daytime Records
35.2 C on: 25 Jul 2019	-4.9C on: 17 Dec 2010
12 hr Night-time Records
26.2C on: 26 Jul 2019	-7.1C on: 18 Dec 2010

TODAY:

Cloud Conditions:

Sun Yesterday:

Updated:

Hi Res Rain⁷	Last Rain	Rain Rate	Max Rain Rate	Time Max Rain Rate
mm

AQI PM_{2.5µ dia}	AQI PM_{10µ dia}	NowCast AQI PM_{2.5µ dia}	NowCast AQI PM_{10µ dia}
µg/m³	µg/m³	µg/m³	µg/m³

¹ Rain season: Jan 1st to Dec 31st. ⁵ Estimated amount of water needed to replace the water used by plants and evaporation from the past week. Negative numbers mean amount of water needed, positive numbers mean excess water is present. ⁶Sun hours measured using an Instromet MetPlus data logger. ⁷Rainfall measured using an Instromet MetPlus.

WXSIM Weather Forecast - Tonight's and Wednesday's Outlook

Tonight

Chance rain
Low: 15°C

WXSIM forecast: Cloudy in the evening, becoming dense overcast after midnight. A slight chance of rain in the evening, then a chance of rain after midnight. Low 15°C. Wind west around 5 mph, gusting to 17 mph. Chance of precipitation 40 percent. Precipitation mostly less than 2 mm.
Local station forecast: Mostly cloudy and cooler, precipitation possible within 12 hours, possibly heavy at times, windy.

Wednesday

Fog a.m.
High: 22°C

WXSIM forecast: Mostly cloudy to cloudy in the morning, becoming partly to mostly cloudy in the afternoon. Patchy light fog in the morning. A chance of rain. High 22°C. UV index up to 4. Wind west around 7 mph. Chance of precipitation 30 percent. Precipitation mostly less than 2 mm.

WXSIM Short Term Weather Forecast

Wednesday

Fog a.m.
High: 22°C

Wednesday
night