When Is Shoulder Season? May and September, Each in 7 of 10

Ask a hundred and thirty-six itineraries which month sits between the crowds and the bad weather and they give the same two answers: September, 94 times, and May, 93.

The finding

Across 136 AI-generated itineraries in 54 countries, each carrying a month-by-month season call, September is a shoulder month in 94 destinations and May in 93, and 58% of destinations name both. July and August are peak in 65% of destinations and the months to avoid in 35%; January and February are avoided more often, by 41%. The labels are the planner's, modeled from climate and travel-season knowledge, not from prices or arrivals.

• Shoulder season is May and September. 79% of destinations name one, 58% name both; June, October and April follow.
• Peak is July and August in two thirds of destinations, with December, June, October and January carrying the winter-sun and dry-season places.
• Winter is avoided more than summer. January or February in 41% of destinations; July or August in 35%.
• Spring is the recommended window for 76 of 136 destinations; summer for 28, a dry season for 16, autumn for 7.
• 26 destinations name no month to avoid, and 11 put a July or August in both peak and avoid: the Mediterranean and Californian coast.

Every month, four ways

Month	Peak	Shoulder	Off-peak	Avoid
January	24	4	58	55
February	13	13	62	54
March	13	24	77	22
April	16	56	56	8
May	12	93	29	2
June	32	71	10	26
July	88	7	10	42
August	86	8	7	47
September	18	94	10	14
October	28	57	42	9
November	9	29	77	21
December	32	4	64	36

Number of destinations (of 136) whose itinerary places the month in each class. The planner's schema puts each month in exactly one class, and 118 itineraries do; 18 put at least one month in two classes (13 to 15 month slots instead of 12), so the January and February off-peak and avoid columns double-count six destinations and the July and August peak and avoid columns double-count eleven. Those rows are read here as a generation inconsistency, not a signal.

When is shoulder season?

May and September, each for seven destinations in ten. The shape of the shoulder columns is the shape of a Northern Hemisphere year: the two months either side of the July and August peak, with June (71), October (57) and April (56) as the second ring. May carries the fewest avoid labels of any month, two destinations, and the fewest peak labels of the spring-to-autumn run, twelve.

September is peak rather than shoulder in 18 destinations, and they are a mixed set: the Italy routes and Madrid, where the planner puts the autumn peak in September; Munich, where it is Oktoberfest; New York and Washington; Acadia, the California coast and the Camino de Santiago, where September is the best weather of the year. The destinations where both May and September are shoulder run from the Albanian Riviera and the Algarve through Amsterdam, Austria and Athens, which is to say most of Europe. A traveler who can move a trip by a month gets the largest change in crowds for the smallest change in weather at those two edges.

What is the best time to travel?

Spring, for most of this corpus. Taking the first season word in the planner's recommended window, spring leads for 76 of 136 destinations, summer for 28, a dry season for 16, autumn for 7, a cool season for 3 and winter for 2; four windows name only a month range. That is a corpus weighted toward Europe (Italy alone has 11 itineraries), the United States (27) and Asia, with ten itineraries south of the equator, so the shares lean north and temperate.

The exceptions carry the information. Thailand's window is November to February, the dry season, with June to September avoided. Bali's is May to September, the other dry season, with November to March avoided. Iceland's is June to August, the only months the interior opens, with December to February avoided. Tokyo's is late March to May, cherry blossom, with a note that October and November tie it for autumn color. Corpus shares are a starting point; the destination's row is the plan, and a generated itinerary carries that row for the trip it plans.

Which months should I avoid?

January and February are the months to avoid for more destinations than any other: 55 name January and 54 name February, against 47 for August and 42 for July; December is 36. Read with the peak column, the winter avoid labels belong to cold-weather destinations (Iceland, the Alps in the months the passes close, most of the United States outside the Sunbelt) and to monsoon-facing coasts in their wet months (Bali's November to March).

The summer avoid labels overlap with peak in a way the winter ones do not. Of the 42 destinations that avoid July, 10 also call July peak, and Portugal does the same for August: the Algarve, the Amalfi Coast, Athens, Big Sur, the French Riviera, two Greece itineraries, Sardinia, Sicily, Venice and Portugal, all summer coasts. The schema says a month belongs to one class, so those 11 are an inconsistency in the generation rather than a verdict, and this page does not read a meaning into them beyond noting where they cluster. In the other 125 destinations peak and avoid never share a month.

26 destinations name no month to avoid at all: Amsterdam, Austria, Dublin, Hawaii, Lake Como, most of the Italy itineraries, the California budget route, Acadia. Those are the trips a traveler can move to whatever month the fares favor.

Seven destinations, month by month

Destination	Recommended window	Peak	Shoulder	Avoid
Tokyo, 3 days	Spring (late March to May)	Apr, Oct, Nov	Mar, May, Sep	Jun, Jul, Aug
Bali, 7 days	Dry season (May to September)	Jul, Aug	May, Jun, Sep	Nov to Mar
Paris, 5 days	Spring (April to June)	Jul, Aug	Apr, May, Jun, Sep, Oct	none
Iceland, 7 days	Summer (June to August)	Jun, Jul, Aug	May, Sep	Dec, Jan, Feb
Thailand, 10 days	November to February	Dec, Jan	Nov, Feb, Mar	Jun to Sep
Italy, 7 days	Spring and autumn	May, Jun, Sep, Oct	Apr, Jul, Aug	none
New Orleans, 4 days	Spring (March to May)	Apr, May	Mar, Oct, Nov	Jun to Sep

Italy is the row to read twice: July and August are shoulder there, not peak, because the itinerary's peak is the spring and autumn window the planner recommends. Four of the eleven peak-and-avoid coasts one table up are Italian (Amalfi, Sardinia, Sicily, Venice), and the country-level Italy itinerary reads its summer the opposite way.

What the number is not

These are the planner's season classes, generated with each itinerary from climate and travel-season knowledge. They are not booking prices, not arrival statistics, not hotel rates, and not independently verified. "Peak" is the planner's read of when a destination is busiest, "avoid" of when the weather or the crowds make it a poor choice. The schema puts each month in one class; 18 of 136 itineraries break that, two carry an empty or "null" avoid entry, and the counts here treat the breaks as noise rather than meaning. The corpus is the 136 itineraries live on the site on one day, weighted toward Europe, the United States and Asia; a Southern Hemisphere or monsoon destination reads the year differently, and ten of them are here.

Use the shares to pick the month before the destination is fixed, and the destination's row once it is. Fares are the other half of the decision, and this page has none.

Methodology

The corpus is the 136 AI-generated itineraries live on monkeyeatingmango.com on September 23, 2026, fetched from the site's own itinerary endpoint, across 54 countries. Each itinerary's weather section carries a recommended window (a short headline) and four month lists: peak, shoulder, off-peak and avoid. Every list was counted per month across all 136, ignoring two entries that were not month names (an empty string and the word "null"); the headline was classed by the first season word it contains (spring, summer, autumn, winter, dry season, cool season), or as a month range when it has none. Shares are of 136. Eighteen itineraries place at least one month in two classes against the schema's one-class rule and are counted as labeled. The season classes are modeled by the planner with the itinerary; no price, arrival or weather-station data was joined to them. The United States contributes 27 itineraries, Italy 11, Spain 7, and Portugal, the United Kingdom and Iceland 5 each; ten itineraries sit south of the equator.

Related reading

• A week-long trip costs $328 a day; a 3-day trip costs $414: cost per day by trip length, the other half of the when-and-where decision
• Trip Cost Index 2026: what the corpus says a trip costs
• Japan travel guide: the seasons behind Tokyo's row, with the trains and the passes
• How to plan the perfect trip: the planning sequence, month before destination

Last updated September 2026.