Mumbai's monsoon is not like rain anywhere else in India. Between June and September, the city gets an average of 2,400mm of rain. Some days it is a brief afternoon shower. Other days it comes in sideways and umbrellas are useless. A jacket that works in Shimla in October will not work on a Mumbai local platform in July.
This guide explains what to look for, what to avoid, and which options are available at Outdoor Goats for both daily commuting and monsoon trekking.
Shop men's waterproof jackets: Men's Rainwear
Shop women's waterproof jackets: Women's Rainwear
Why Most Jackets Fail in Mumbai
The problem with Mumbai is not just the amount of rain. It is the combination of heavy rain and high humidity. A jacket that handles one but not the other will fail you.
- Jackets with only a water-repellent coating. This coating makes water bead off in light rain. But in Mumbai's heavy showers, it gets overwhelmed quickly. You need a jacket with a waterproof membrane inside the fabric, not just a coating on the outside.
- Jackets that do not breathe. A fully waterproof but non-breathable jacket traps body heat inside. In 30-degree humidity, you end up just as wet from sweat as from rain. This is the most common mistake people make.
- Thick hiking shells. Great for mountains. Too hot and too bulky for city commuting. Most people stop wearing them after one sweaty train journey.
- Jackets with unsealed seams. Water gets in through stitch holes first. A jacket with unsealed seams will let in water through every join in the fabric, no matter how waterproof the fabric itself is.
Find breathable, properly sealed options: Men's Rainwear
What to Look for in a Monsoon Jacket
Waterproof rating
The waterproof rating tells you how much water pressure the fabric can resist before it lets water through. It is measured in millimetres. Here is a simple guide:
|
Rating |
What it means |
Good for |
|
1,500 to 5,000mm |
Light rain only |
Not suitable for Mumbai monsoon |
|
5,000 to 10,000mm |
Moderate rain |
Light showers, short exposure |
|
10,000 to 20,000mm |
Heavy, sustained rain |
Mumbai commuting in full monsoon |
|
20,000mm and above |
Extreme conditions |
Trekking in heavy rain, exposed terrain |
For Mumbai, you need at least 10,000mm. Anything lower will start leaking during sustained heavy rain.
Shop jackets with the right rating: Men's Rainwear
Breathability
Breathability measures how much moisture (sweat vapour) can pass through the fabric from inside to outside. For Mumbai's humidity, aim for a breathability rating of at least 10,000g per square metre per 24 hours. Below this, you will feel very clammy during any physical activity including walking quickly or using public transport.
Shop breathable options for women: Women's Rainwear
Sealed seams
There are three types of seam sealing:
- Fully sealed seams. Every seam is covered with waterproof tape. The best option. Use this for heavy monsoon conditions.
- Partially sealed seams. Only the main seams are sealed. Fine for moderate rain, not ideal for sustained Mumbai downpours.
- Unsealed seams. No seam sealing. Fine for a light drizzle. Will leak in heavy rain.
Find fully sealed jackets in the rainwear range: Men's Rainwear
The hood
The hood matters more than most people realise. Look for one with a drawstring you can tighten around your face, a stiffened brim that directs water away from your eyes, and enough room to fit over a cap or helmet. A hood that collapses in wind or leaves a gap at your forehead makes the rest of the jacket pointless.
Packability
Mumbai mornings are often dry. Afternoons can be a full monsoon downpour. A jacket that cannot pack into its own pocket or a small pouch will be left at home on the days you need it most. Look for jackets that weigh under 400g and fold down to roughly the size of a water bottle.
Shop packable rain vests and light shells: Men's Vests and Rain Jackets
City Commuting vs Trekking: What is Different
|
Feature |
City commuting |
Monsoon trekking |
|
Waterproof rating |
10,000mm minimum |
15,000mm or above |
|
Breathability |
Very important. You are moving in heat and humidity. |
Very important. Physical effort is higher. |
|
Weight |
Under 400g. You carry it all day. |
Under 600g. Pack weight matters. |
|
Packability |
Essential. Must fit in a work bag. |
Helpful but less critical with a full pack. |
|
Hood |
Adjustable and close-fitting. |
Big enough to fit over a helmet. |
|
Seam sealing |
Partially sealed at minimum. |
Fully sealed for sustained rain. |
Best Options at Outdoor Goats for 2026
For city commuting
For daily Mumbai use, you want a lightweight jacket that packs small, has a waterproof rating of 10,000mm, sealed seams, and a hood that actually works. The Outdoor Goats men's and women's rainwear ranges have options designed for exactly this. Light enough for a work bag. Effective enough for a monsoon platform.
Shop men's city rain jackets: Men's Rainwear
Shop women's rain jackets: Women's Rainwear
Shop rain vests and packable shells: Men's Vests and Rain Jackets
For trekking in the Western Ghats during monsoon
Monsoon trekking in the Sahyadri is one of the best outdoor experiences in India. It is also one of the wettest. For trails between June and September, you need a jacket rated at 15,000mm or above, fully sealed seams, and a hood big enough for a helmet. The Outdoor Goats outdoor trekking range has more structured jackets built for this use.
Shop outdoor trekking rain jackets: Men's Rainwear
Shop all trekking and hiking gear: Hike and Trek activity page
What to Wear Under Your Rain Jacket
A rain jacket keeps water out. It does not keep you warm. What you wear underneath matters, especially when you move between outdoor rain and air-conditioned offices or vehicles.
- A moisture-wicking inner layer. This layer pulls sweat away from your skin so you stay dry from the inside. Even when the jacket is working hard outside, you stay comfortable inside.
- A fleece layer on cooler days. A lightweight fleece between your inner layer and your jacket adds warmth without bulk. Fleece stays warm even when damp, which makes it the right choice for wet conditions.
- Avoid cotton against your skin. Cotton holds moisture and keeps it against your body. In Mumbai's combination of outdoor rain and cold air conditioning, this makes you uncomfortable all day.
Shop moisture-wicking inner layers: Baselayers collection
Shop fleece jackets: Fleece and Hoodies
Looking After Your Jacket
- Wash it regularly. Dirt and body oils break down the water-repellent coating faster than rain does. Wash on a gentle cold-water cycle.
- Do not use fabric softener or regular detergent. Use a wash product made for waterproof clothing such as Nikwax Tech Wash.
- Tumble dry on low heat after washing. Gentle heat reactivates the water-repellent coating.
- Reapply water-repellent spray once a year or when water stops beading on the surface.
- Store it hanging or loosely folded. Keeping it compressed in a bag for months at a time can weaken the waterproof membrane.
Frequently Asked Questions
Is a rain poncho better than a jacket for Mumbai?
Ponchos are cheaper and cover more of your body. But they catch wind and flip easily. They are also impractical on crowded local trains and busy streets. A fitted jacket with a good hood is more practical for city use, even if it costs more.
Shop fitted rain jackets: Men's Rainwear and Women's Rainwear
How do I tell if a jacket is truly waterproof or just water-resistant?
Water-resistant means it has a coating that repels light rain. Waterproof means it has a membrane inside the fabric that blocks water under pressure. Look for a waterproof rating in the product details. If no rating is listed, the jacket is probably only water-resistant. Proper waterproof jackets always state a rating.
Find clearly rated waterproof jackets: Men's Rainwear
Can I use my city rain jacket for Sahyadri trekking?
A city jacket rated at 10,000mm will manage the Sahyadri in light to moderate rain. In heavy monsoon downpours on exposed ridgelines like Harishchandragad or Rajmachi, a more robust jacket rated at 15,000mm with fully sealed seams works much better. The two situations overlap but are not the same.
Shop outdoor trekking jackets: Men's Rainwear
How many rain jackets do I need?
One good jacket is enough. Most people buy a cheap one, find it does not work, and buy a better one the following year. Buy the right jacket once: rated at 10,000mm or above, sealed seams, packs small. One good jacket will last three to five seasons.
Browse the full rainwear range: Men's Rainwear and Women's Rainwear
|
Find Your Monsoon Jacket From packable city shells to full trekking rain jackets, Outdoor Goats has waterproof options for every kind of Mumbai weather. |
Comments