April to May and September to October. Month by month below, with the weather, what's on and what it costs to fly there from your city.
Most sources point to spring (April and May) and early autumn (September and October) for decent weather and thinner crowds; May and September come up most.
5 of the 9 travel guides we read name these months.
Average high and low in Edinburgh, and days with rain
JanuaryChecking fares…Burns Night is on 25 January; Up Helly Aa fire festival is held in Shetland.Up Helly Aa, a Viking fire festival, takes place in Shetland.Celtic Connections
FebruaryChecking fares…Snow in the Cairngorms draws skiers and snowboarders; few visitors overall.Calm and quiet with cooler weather and shorter days; ice climbing and snowshoeing are on offer.Winter Words Festival
MarchChecking fares…Spring weather is unpredictable and still chilly.Edinburgh Science Festival · Glasgow International Comedy Festival
Best timeAprilChecking fares…One of the drier months, not peak season, with good travel deals and longer days.Warms up and nature comes back to life; the Isle of Mull is a draw.Spirit of Speyside Whisky Festival is held in late April.
Best timeMayChecking fares…Warmer weather suits the Highlands, and the Highland games season begins.Late May has a lesser chance of rain and more sunny days than September, with long daylight.The last weekend in May is a Bank Holiday, so places are busier and pricier.Edinburgh Marathon Festival
JuneChecking fares…Often the driest month in parts of southern Ireland and sunny in both countries; Highlands daylight past 10 pm.A good month to explore East Lothian's coast and golf.TRNSMT Festival
AugustChecking fares…Edinburgh Fringe and the Edinburgh Festivals bring crowds; midges are a nuisance in the Highlands.Highlands midges can be a nuisance in August.Edinburgh Festival Fringe
Best timeSeptemberChecking fares…Mix of rain and dry spells, with golden foliage and the Braemar Gathering ending the Highland Games season.Weather can be hit and miss: an extended summer or early cold.Wigtown, Scotland's National Book Town, is a September pick.Braemar Gathering
Best timeOctoberChecking fares…Wettest month in Scotland, with nearly six inches of rain on average.Perthshire is known for autumn colour in October.Some tourist offices and hotels in the Highlands close for the low season.Scottish International Storytelling Festival
NovemberChecking fares…Last of the fall colour early in the month, first snow later; off-season rates apply.Edinburgh events honour St. Andrew.Edinburgh Christmas Market
DecemberChecking fares…Christmas lights and markets in towns and cities; ski season starts in the Highlands.Sun sets at 3:44pm in Glasgow on the winter solstice.Edinburgh's HogmanayWeather: Edinburgh averages from Met Office (long-term averages), as listed in its climate table on Wikipedia.
Live fares from your airport. Watch them and we alert you when they drop.
Festivals and seasons through the year
Cancún
The Grand Canyon
Disneyland
Miami
Myrtle Beach
Prague
Bali
Maui
Montreal
Venice
Aruba
New Orleans
Nashville
Disney World
New York
Rome
San Diego
Phuket
Boston
Dubai
Seoul
Florida
Lisbon
Los Angeles
Chicago
Paris
Las Vegas
San Francisco
Edinburgh
Napa
Sydney
Hawaii
Punta Cana
Savannah
Washington, DC
Mexico City
Zion National Park
Turks and Caicos
Puerto Vallarta
Honolulu
Banff
Yosemite
Tulum
The Bahamas
Sedona
Seattle
Santorini
Buenos Aires
London
Charleston
Rio de Janeiro
Palm Springs
Yellowstone
Amsterdam
Toronto
Key West
Orlando
Europe
Austin
Machu Picchu
Cabo San Lucas
Niagara Falls
Colorado
Oregon
Arizona
Acadia National Park
Galapagos
Lake Tahoe
Montana
Kauai
Okinawa
US Virgin Islands
Amalfi Coast
Santa Fe
Destin
Curacao
Utah
Joshua Tree
Patagonia
St. Thomas
Florida Keys
Smoky Mountains
Copenhagen
Death Valley
Mallorca
Madeira
Cape Town
Ibiza
Zanzibar
Lake Como
Madrid
New Mexico
Tennessee
Vermont
Wyoming
Bryce Canyon
Oahu
St. Martin
Hilton Head
Dolomites
Cape Cod
San Antonio
Rocky Mountain National Park
Dublin
Catalina Island
Athens
Asheville
Texas
South America
Shenandoah National Park
Phoenix
North Carolina
Medellín
Cairo
Budapest
Arches National Park
St. John
South Carolina
Reykjavik
Mykonos
Milan
Houston
Hanoi
Canary Islands
Big Island of Hawaii
Atlanta
The Caribbean
St. Barts
South Dakota
Rhode Island
New England
Nassau
Lima
Kyoto
Koh Samui
Colorado Springs
Chiang Mai
Stockholm
Porto
Montego Bay
Michigan
Melbourne
Louisiana
Kuala Lumpur
Kruger National Park
Jeju
Florence
Dallas
Zurich
Tampa
St. Kitts
Osaka
Munich
Moorea
Kailua-Kona
Everglades
Door County
Cusco
Calgary
Boracay
Bonaire
Swiss Alps
St. Croix
Seville
San Juan Islands
New Hampshire
Minnesota
Mazatlán
Manila
Kentucky
Isla Mujeres
Guam
French Riviera
Fort Lauderdale
Cinque Terre
Asia
Algarve
Virginia
Tenerife
Sapporo
Nairobi
Mumbai
The Hamptons
Grand Teton National Park
Finger Lakes
Charlotte
Bogotá
Auckland
Maine
Bora Bora
Olympic National Park
Redwood National Park
Sequoia National Park
Big Bend National Park
Mackinac Island
Sint Maarten
Nantucket
Outer Banks
California
Big Sur
Crater Lake
Scottsdale
Nice
Mount Rainier
Cozumel
Badlands National Park
Salt Lake City
Denali
Philadelphia
Tucson
Provence
Guadalajara
Albuquerque
Upper Peninsula
Sonoma
Memphis
Idaho
Da Nang
Cotswolds
Arkansas
St. Louis
Capri
Glacier National Park
Barcelona
Vancouver
Denver
Istanbul
Riviera Maya
Carmel-by-the-Sea
Santiago, Chile
Naples, Italy
Central America
Minneapolis
Sarasota
Halifax, Nova Scotia
Pittsburgh
Helsinki
Pensacola
Johannesburg
Brisbane
Málaga
Phu Quoc
Perth
Dubrovnik
Corpus Christi
Massachusetts
Oklahoma
Torres del Paine
Czech Republic
Ho Chi Minh City
Anchorage
Boise
Louisville
Juneau
Quito
West Virginia
Wisconsin
Canyonlands National Park
Baja California
Blue Ridge Mountains
Fort Myers
Detroit
Kansas City, Missouri
Kathmandu
Reno
Cebu
Brussels
Guangzhou
Chattanooga
Antalya
Daytona Beach
Cairns
Hilo
Alabama
Connecticut
New Jersey
Pennsylvania
Capitol Reef National Park