The first time I tried to train for a December marathon through the monsoon I lasted four weeks before I broke. Not my body. My head. The puddle on the Mumbai promenade got me. The bus splashed me. The plan said tempo and the sky said no. I have run six marathons since. Three of them through monsoon builds. The lessons are not in the plans. They are in the negotiations between you and the sky.
The Indian marathon calendar is a quiet act of meteorological denial. The major city races — Mumbai, Delhi, Bengaluru, Hyderabad — sit between November and February. The training blocks for them, the long sixteen-week builds where the work actually gets done, fall almost entirely inside the southwest monsoon and its trailing tail. June, July, August, September. The wettest months of the year are also the months when you are supposed to be building the engine. This is the puzzle.
The first negotiation: the plan you imagined versus the plan that exists
In 2022 my coach said something I write down every June. He said: a monsoon training cycle is a draft. Not a script.
What he meant is this. The plan you printed on June first will not survive. Trains will be cancelled. The road outside your apartment will become a river. Power will go out. Your gym will flood. The long run you scheduled for Sunday will collide with a yellow alert. You will need to move. To make moves and keep moving.
The runners I know who finish their builds intact share one quality. They do not treat a moved workout as a failed workout. They treat it as a moved workout. The number of kilometres a plan asks for in a week matters less than the question of whether those kilometres landed somewhere in that week. Tuesday's tempo becomes Wednesday's tempo. Sunday's long run becomes Monday's long run. The body does not check the calendar. The body checks the load.
The minimum non-negotiables
Inside that flexibility there are three things that should hold. One long run a week, even if shorter than planned. One harder workout a week — tempo, threshold, or hills — even if indoor. Three easy runs that bring the weekly volume close to plan. Below this floor, fitness leaks. Above this floor, you have permission to improvise. The Daniels VDOT framework in the STRIDD lab gives you defensible pace anchors for those workouts.
The second negotiation: indoors versus outdoors
The treadmill is the most India-monsoon-relevant piece of equipment in any runner's life. It is also the most maligned. Mumbai marathoners I respect have logged half their monsoon long runs on a treadmill. So have Bengaluru marathoners — though in their case the question is less rain and more the perfectly engineered horror of running in unbroken drizzle for two and a half hours.
The trade-off is real. A treadmill removes weather. It also removes terrain. It removes camber. It removes the wind in your face that you will have at kilometre thirty of the real race. So the rule I have settled into is this. The long run is the run I most try to do outdoors. The tempo and easy runs are the runs I most willingly move indoors. Long runs build the specific resilience the marathon will demand. The other sessions build the engine, and the engine does not care about the surface.
Reading the weather like a runner
Yellow alert is run-if-you-can. Orange alert is move-it-or-treadmill. Red alert is rest, no matter what the plan says. A 2019 paper on heat and humidity in endurance running confirmed what monsoon runners have known instinctively for decades. Wet-bulb temperatures above twenty-eight Celsius push perceived effort up and economy down, and at high humidity an easy run becomes a tempo run without anyone changing pace. You are not weak. You are doing physiology.
The third negotiation: your skin, your gut, your shoes
Skin is the first thing to break in a monsoon build. Chafing in places dry runners never think about. The fix is boring and effective. Synthetic socks, not cotton. Petroleum jelly on the inner thighs, under the arms, anywhere a seam meets skin. Anti-fungal powder after the shower. Talcum powder before the long run if you have learned that you are prone to it. The cost is under three hundred rupees a month. The benefit is not having to skip Wednesday because your inner thigh is a wound.
Your gut is the second. Race-day fuelling rehearsal matters in monsoon training more than in any other season because heat and humidity change what your stomach will accept. Practice in the rain. Practice with the gel you intend to use at the Tata Mumbai Marathon or whatever your goal race is. The long run guide covers the structure. The fuelling test happens inside that structure, not after it.
Shoes that survive
A shoe in a monsoon does not last as long as a shoe in a Bengaluru winter. Foams age faster when soaked and re-soaked. Two pairs in rotation outlast one pair run continuously. Drying with newspaper inside, not on a heater, preserves the upper. None of this is exotic. It is just what monsoon marathoners learn the second year of running.
The fourth negotiation: the mind
Here is the truth nobody puts in a training plan. The hardest part of a monsoon marathon build is not the kilometres. It is the days when the weather decides for you. It is the long run you moved twice and now have to do at five in the evening through standing water on a road you do not love. It is the third Saturday in a row when the alert is orange and you choose between treadmill or rest.
The marathoners who finish strong learn to treat those days as the actual training. Not the perfect Tuesday session at six in the morning. The mucky, displaced, badly-lit, half-improvised long run on a Wednesday evening. That is the run that teaches you what the last ten kilometres of the marathon will feel like. The race will not be perfect. Your training does not need to be either.
If you are starting a monsoon build now, the simplest move is to begin with a structured plan that knows the season. The STRIDD plan generator produces a free marathon plan that adapts week by week. Pair it with the marathon plan hub for context, and the pace calculators for your targets. The full Running Lab archive has more on heat, humidity, and the curious art of finishing what the sky tried to drown.
Train the draft. Move the workouts. Make peace with the puddles. The race is in November. The story is being written now.