The Met Office station in this table is Heathrow. It is the long climate record people mean when they quote 'London,' and it is still an airport station west of the centre. Kew, Greenwich, and Hampstead exist in the same Met Office catalogue and are not substituted here.

The UK sheet is a different table, the HadUK-Grid national average. If you are choosing a month for London, use this one. Summers are the warmer months in the highs, and rain does not collapse to one season the way it does on the Mexican coast. No single month is crowned.

Month by month

The highest average daily high is 23.89°C in July. The lowest average daily low is 2.65°C in February. The wettest month in the water column is November at 66.63 mm, and the lightest is March at 38.78 mm. These sentences only restate the table. They are not a ranking of the best month to go.

Station: Heathrow, 1991–2020. Averages for 1991-2020. The rule runs from that month’s average low to its average high, on this station’s own scale. The black bar under the water figure is that month against the wettest month here.
Month	High °C	Low °C	Rainfall (mm)
January	8.42	2.68	58.83
February	8.98	2.65	44.96
March	11.73	4.14	38.78
April	15.00	6.03	42.31
May	18.37	9.08	45.91
June	21.57	12.03	47.25
July	23.89	14.18	45.80
August	23.40	14.06	52.78
September	20.22	11.62	49.61
October	15.81	8.78	65.07
November	11.47	5.26	66.63
December	8.79	3.08	57.05

Met Office location-specific long-term averages for 1991–2020. The Met Office says these station averages are a sample for general interest, and that where a station record is incomplete, values for missing months may be estimated from well-correlated stations. Source: Station: Heathrow, 1991–2020.. As of 2026-11-14.

The facts, in sentences

Plugs and voltage

The IEC world-plugs list shows the United Kingdom at 230 volts and 50 hertz, with plug type G.

IEC World Plugs. As of 14 November 2026.

Driving side

Highway Code rule 160 says that once moving you should keep to the left, unless road signs or markings indicate otherwise. The exceptions named in that rule are overtaking, turning right, or passing parked vehicles or pedestrians in the road. This Highway Code applies in England, Scotland, and Wales.

The Highway Code, rules 159 to 203, GOV.UK. As of 14 November 2026.

Tap water

CDC's traveler page for the United Kingdom, last reviewed 25 August 2026, does not say whether tap water is safe or unsafe. It says food and water standards vary by destination and by what you are doing, and it points readers to CDC's food and water precautions. This page does not turn that into medical advice.

CDC Travelers' Health, the United Kingdom. As of 14 November 2026.

Currency

ISO 4217 lists the currency name Pound Sterling and the code GBP for United Kingdom.

ISO 4217 currency list (SIX). As of 14 November 2026.

Time zone

London uses the IANA zone Europe/London, which zone1970.tab assigns to Great Britain.

IANA tzdb zone1970.tab, Europe/London. As of 14 November 2026.

Tipping

VisitBritain says tipping is not expected in Britain the way it is in some other countries, staff must be paid at least the National Minimum Wage, and a tip is polite for good service rather than required. Some bills add a service charge, which you can decline. If nothing is added, VisitBritain calls 10–15 a standard restaurant tip when the service was good, and 10–15 percent a nice gesture for a taxi, or rounding the fare up to the next pound. A hotel porter is customarily about £2.

VisitBritain, useful information. As of 14 November 2026.

Entry requirements

The UK government's visa check. We do not restate the result. GOV.UK: Official entry requirements. Checked 14 November 2026. We do not rewrite the rule.

Hotels, tours, and a plug

Hotel and tour links stay off until a partner ID is set in the site config. They are not affiliate links today. The adapter search is an Amazon link with tag thetravelfact-20.Affiliate disclosure.

Viator

Tours. ID empty, so there is no outbound link.

Expedia

Hotels. ID empty, so there is no outbound link.

Booking.com

Hotels. ID empty, so there is no outbound link.

Travelpayouts

Network. ID empty, so there is no outbound link.

Travel adapter for London. A search, not a product we chose. Match the plug type on this page before you buy.

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