San Diego, at the southern tip of California, on the Pacific and right by the Mexican border, is worth visiting for its beaches, Balboa Park and its zoo, the USS Midway aircraft carrier, the coves of La Jolla and the Coronado peninsula. Things to do in San Diego, how many days to allow, when to go according to official NOAA normals and entry requirements for US and UK travelers: here are the essentials, with a calculation we have not found elsewhere, the number of rainy days to expect over a week, month by month.
With more than 1.4 million inhabitants, San Diego is the second-largest city in California and the eighth in the United States. It is nicknamed the « birthplace of California »: Juan Rodríguez Cabrillo landed here in 1542, and the presidio and mission San Diego de Alcalá, founded in 1769, formed the first European settlement in present-day California. The city also has long ties with the US Navy, which you can see all around the bay.
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San Diego at a glance
- Location Southern California, on the Pacific coast, at the Mexican border (cross-border metro area with Tijuana)
- Language English; Spanish widely spoken
- Currency US dollar; see our currency converter
- Time zone Pacific Time, UTC−8 (UTC−7 in summer): 8 hours behind London and 3 hours behind New York most of the year
- Entry US citizens: domestic travel; UK citizens: approved ESTA or US visa before travel (GOV.UK)
- Climate mild all year, dry from April to November; rain concentrated from December to March
- Highlights Balboa Park and the zoo, USS Midway, Gaslamp Quarter, Old Town, La Jolla, Coronado, Cabrillo National Monument, Torrey Pines
Things to do in San Diego: the highlights
Balboa Park
This 490-hectare (1,200-acre) urban park, set aside as early as 1835, is one of the oldest in the United States dedicated to public recreation. It hosted the 1915-1916 Panama-California Exposition and the 1935-1936 exposition, which left Spanish-style buildings, including the California Tower. It holds many museums: the San Diego Museum of Art, the Natural History Museum, the Museum of Us, the Museum of Photographic Arts and the Air & Space Museum. The whole park has been a National Historic Landmark since 1977. Allow at least half a day, more if you add the zoo.
The San Diego Zoo
Set on 40 hectares (100 acres) in Balboa Park, the zoo grew out of animals left behind after the 1915 exposition. It pioneered cageless enclosures that recreate natural habitats. It houses more than 12,000 animals of over 680 species and subspecies and is the most visited zoo in the United States. The same organization runs the San Diego Zoo Safari Park, outside the city but within the county. Book tickets on the official website.
The USS Midway Museum
Moored at Navy Pier, on the downtown waterfront, the aircraft carrier Midway has become a museum. It holds a large collection of aircraft, many of them built in Southern California. It is the visit most directly linked to the city’s military and naval past.
Gaslamp Quarter and the waterfront
Downtown, the Gaslamp Quarter stretches from Broadway to Harbor Drive, between 4th and 6th Avenues. This historic district has more than 90 buildings, most from the Victorian era, now home to restaurants, shops and bars: it is the heart of the nightlife. Petco Park, home of the Padres (baseball), is a block away. The waterfront links the district with the Midway and Seaport Village.
Old Town
The original town grew up at the foot of Presidio Hill. Old Town San Diego State Historic Park, created in 1968, brings together many buildings from 1820-1870 and recalls San Diego’s early Mexican and then American days. In 2005 and 2006, it was the most visited state park in California according to California State Parks.
La Jolla
A neighborhood in the north of San Diego, La Jolla covers 11 km (7 mi) of Pacific coastline: coves, cliffs and beaches. It is also home to the University of California San Diego, the Birch Aquarium and the Scripps Institution of Oceanography. If you come across seals or sea lions on the coast, watch them from a distance and follow the signs.
Torrey Pines State Natural Reserve
North of La Jolla, this 810-hectare (2,000-acre) reserve is one of the wildest stretches of the Southern California coast. Its 13 km (8 mi) of trails run along cliffs above Torrey Pines beach and protect the Torrey pine, a rare tree. During the whale migration, gray and humpback whales can be spotted from the cliffs.
Coronado and the Hotel del Coronado
Facing downtown across the bay, Coronado is a peninsula linked to the mainland by a sand spit, the Silver Strand. People come for its beach and the Hotel del Coronado, « The Del »: when it opened in 1888, it was the largest seaside resort hotel in the world. It is a rare example of a wooden Victorian beach resort, designated a National Historic Landmark in 1977.
Cabrillo National Monument and Point Loma
At the southern tip of the Point Loma peninsula, this national monument commemorates Cabrillo’s landing in the bay on September 28, 1542, the first European expedition to set foot on what is now the West Coast of the United States. The site looks out over the bay, the city and Coronado and, on clear days, as far as Tijuana and Mexico’s Coronado Islands. The old Point Loma lighthouse, in service from 1855 to 1891, is open to visitors.
How many days in San Diego? A 3-day itinerary
| Day | Morning | Afternoon | Evening |
|---|---|---|---|
| 1: downtown and the bay | USS Midway Museum | Waterfront, Seaport Village | Gaslamp Quarter |
| 2: Balboa Park | San Diego Zoo | Balboa Park museums and gardens | Old Town |
| 3: the coast | La Jolla and its coves | Torrey Pines, or Coronado and Point Loma | Sunset on a Pacific beach |
Two days are enough for the highlights of downtown and Balboa Park; three to four days let you add the north coast and Coronado. San Diego combines easily with Los Angeles on a California road trip.
When to go to San Diego?
Year-round, with a preference for late summer and fall (August to October). San Diego has a very dry Mediterranean climate: only 248 mm (9.8 in) of rain a year at the airport. Highs vary little, from 18.9 °C (66 °F) in December to 25.2 °C (77 °F) in August. August and September are the warmest months; winter stays mild in the afternoon but cool at night (9.9 °C / 50 °F in December), and it is the rainy season: most of the year’s rain falls from December to March. In May and June, a marine cloud layer nicknamed « May Gray » and « June Gloom » often keeps the coast gray and cool while the sun shines a few miles inland; it can last into July.
| Month | High | Low | Rain | Rainy days | Rainy days in 7 days | Sunshine / day | Verdict |
|---|---|---|---|---|---|---|---|
| January | 19.1 °C (66 °F) | 10.2 °C (50 °F) | 50 mm (2.0 in) | 6.5 | 1.5 | 7.7 h | ⚠️ Mild, among the wettest |
| February | 19.0 °C (66 °F) | 11.0 °C (52 °F) | 56 mm (2.2 in) | 7.1 | 1.8 | 8.1 h | ⚠️ Mild, rainy |
| March | 19.4 °C (67 °F) | 12.5 °C (54 °F) | 37 mm (1.5 in) | 6.2 | 1.4 | 8.4 h | ✅ Mild, a few showers |
| April | 20.4 °C (69 °F) | 13.9 °C (57 °F) | 17 mm (0.7 in) | 3.8 | 0.9 | 9.2 h | ✅ Pleasant, dry |
| May | 20.8 °C (69 °F) | 15.6 °C (60 °F) | 7 mm (0.3 in) | 2.2 | 0.5 | 8.1 h | ⚠️ Dry, often gray skies (May Gray) |
| June | 22.1 °C (72 °F) | 17.0 °C (63 °F) | 1 mm (0.0 in) | 0.7 | 0.2 | 8.1 h | ⚠️ Dry, often gray skies (June Gloom) |
| July | 24.1 °C (75 °F) | 18.9 °C (66 °F) | 2 mm (0.1 in) | 0.7 | 0.2 | 9.8 h | ✅ Warm, dry |
| August | 25.2 °C (77 °F) | 19.7 °C (67 °F) | 0 mm (0.0 in) | 0.3 | 0.1 | 9.5 h | ✅ The warmest, dry |
| September | 25.1 °C (77 °F) | 19.0 °C (66 °F) | 3 mm (0.1 in) | 0.9 | 0.2 | 8.4 h | ✅ Warm, dry |
| October | 23.7 °C (75 °F) | 16.4 °C (62 °F) | 13 mm (0.5 in) | 2.4 | 0.5 | 7.9 h | ✅ Mild, dry |
| November | 21.5 °C (71 °F) | 12.7 °C (55 °F) | 20 mm (0.8 in) | 3.7 | 0.9 | 7.7 h | ✅ Mild, rare rain |
| December | 18.9 °C (66 °F) | 9.9 °C (50 °F) | 42 mm (1.7 in) | 5.8 | 1.3 | 7.5 h | ⚠️ Cool at night, rainy |
A week in San Diego: how many rainy days?
Scaling the average number of days with precipitation in each month to a 7-day stay, you can expect about 0.1 rainy day in August, and less than one day in 7 from May to October. The most exposed month is February, with about 1.8 days out of 7. Note that the NOAA threshold is very low (0.25 mm / 0.01 in): some of these « rainy days » are only brief showers. Destination de Voyage calculation: days with precipitation in the month × 7 / number of days in the month, based on NOAA 1991-2020 normals.
San Diego averages 3,055 hours of sunshine a year (NOAA 1961-1990 normals), with 7.5 to 9.8 hours a day depending on the month; the gap with inland areas is smallest in May and June, because of the marine cloud layer. To compare with the rest of the state, see when to go to California.
If you… then…: planning your stay
| If you… | Then… |
|---|---|
| are traveling with kids | San Diego Zoo and Balboa Park, then Coronado beach |
| love history | Old Town, Cabrillo National Monument and the old Point Loma lighthouse, USS Midway |
| are looking for nature | La Jolla and Torrey Pines; during the migration season, watch for whales from the cliffs |
| go in May or June | pack a sweater: the coast is often gray in the morning (May Gray, June Gloom) |
| go between December and March | pair the beach with the Balboa Park museums: it is the rainy season |
| want to cross into Mexico | check your car rental contract first, and make sure you can re-enter the US (UK citizens: valid ESTA or visa) |
Getting to San Diego and getting around
- By air: San Diego International Airport (Lindbergh Field) sits on the bay, close to downtown. Many international visitors connect through another US hub or arrive via Los Angeles; check current routes from your home airport.
- In town: the San Diego Trolley, run by the Metropolitan Transit System (MTS), serves downtown among other areas; add buses, ride-hailing or walking downtown.
- By car: a car is still useful for La Jolla, Torrey Pines and the surrounding area. Not all rental contracts allow you to drive into Mexico: check before you go.
Where to stay in San Diego?
Downtown (Gaslamp Quarter, waterfront) is practical without a car, near the Trolley and the Midway. Old Town is a good base for the airport and the north. For the beach, look at Coronado, Pacific Beach or Mission Bay, and for a quieter stay, La Jolla. Prices vary a lot with the seasons and events: compare and book early.
Entry requirements, health and safety
- US citizens: a trip to San Diego is domestic travel, with no entry formalities.
- UK citizens: according to the UK FCDO (GOV.UK, updated 18 August 2026), you need an approved ESTA (only via the official ESTA website or ESTA Mobile app) or a US visa before you travel; some travel histories (Cuba since 12 January 2021, Iran, Iraq, Libya, North Korea, Somalia, Sudan, Syria or Yemen since March 2011) and arrests or criminal records can make you ineligible. Your passport must be valid for the length of your stay.
- Health: medical treatment is expensive and some hospitals ask non-residents for a deposit; UK prescriptions are not valid in the US (GOV.UK). Take out insurance covering medical costs. Emergency number: 911.
- Driving: GOV.UK says you can use a UK photocard driving licence, but you may also need the 1949 international driving permit (IDP), depending on the state, and car hire companies may set stricter conditions.
- Natural hazards: according to GOV.UK, California is among the states at higher risk of earthquakes, and wildfires are a danger in many dry areas: follow the instructions of local authorities and evacuation orders.
- Safety: GOV.UK notes that violent crime and gun crime rarely affect tourists, but advises taking care in unfamiliar areas and not walking through quieter areas alone at night.
For general trip planning, read our United States guide.
Frequently asked questions
How many days do you need in San Diego?
Two days for downtown, the Midway and Balboa Park with its zoo; three to four days to add La Jolla, Torrey Pines, Coronado and Point Loma.
What is the best time to visit San Diego?
San Diego can be visited year-round. From August to October it is warm and dry (an average high of 25.2 °C / 77 °F in August). Most of the rain falls from December to March, and in May-June the coast is often overcast in the morning, according to NOAA 1991-2020 normals for Lindbergh Field.
Is San Diego warm in winter?
Mild in the afternoon, cool at night: in January, an average of 19.1 °C (66 °F) in the afternoon and 10.2 °C (50 °F) in the early morning at the airport (NOAA, 1991-2020).
Do you need a visa to visit San Diego?
US citizens need nothing: it is domestic travel. According to GOV.UK, UK citizens need an approved ESTA or a US visa before travelling; travel to Cuba on or after 12 January 2021, among other cases, makes you ineligible for an ESTA.
How do you fly to San Diego?
San Diego International Airport is right next to downtown; many international travelers connect through another US hub or fly into Los Angeles, about two hours’ drive away.
Our sources
- Entry, safety and health information read on 26 October 2026: UK FCDO, foreign travel advice for the USA (GOV.UK, updated 18 August 2026)
- NOAA, 1991-2020 normals for San Diego International Airport (Lindbergh Field), and 1961-1990 sunshine normals, via the Wikipedia climate box (« Template:San Diego weatherbox »)
- Wikipedia (English): « San Diego », « Balboa Park », « San Diego Zoo », « USS Midway Museum », « La Jolla », « Old Town San Diego State Historic Park », « Hotel del Coronado », « Cabrillo National Monument », « Gaslamp Quarter », « Torrey Pines State Natural Reserve », « Coronado, California »
- Destination de Voyage calculations: sunshine per day, rainy days over a 7-day stay
- Our methodology
Updated October 2026.
To continue your trip, see our guides to California, Los Angeles and Mexico, and our destinations in the Americas.
