The dew factor in Indian cricket, explained with data
"There will be dew later" may be the most common line in Indian winter cricket. It shapes toss decisions, bowling plans and fantasy picks. Here is what it is, why it matters, and what five years of weather data say about this season's venues.
What dew is
Air holds water vapour. When a surface cools to the dew-point temperature, water condenses on it. On clear, calm winter nights grass loses heat quickly and can cool below the air temperature, so dew can form on an outfield even when the air itself is not saturated.
A practical indicator is the dew-point spread: air temperature minus dew point. A spread of a few degrees in the late evening means the air is close to saturation and dew is likely as the night goes on. A spread of 10°C or more means the air is dry.
Why it matters on the field
- Grip. A wet ball is harder to hold and spin. Finger spinners are usually hit hardest.
- Skid. The ball skids on rather than gripping, which makes batting easier.
- Fielding. A wet outfield makes the ball run faster. Catching and throwing get harder.
- Toss. Captains often choose to bowl first when they expect dew, so they can bat when it is at its heaviest.
Ground staff often treat outfields with anti-dew sprays and drag ropes across the grass, which can reduce but not remove the effect.
What the data shows for this season's venues
We took hourly Open-Meteo ERA5 reanalysis data for the 15 days around each fixture date (seven days either side) over five winters (2021-22 to 2025-26). For every evening we calculated the dew-point spread at 10:00 pm IST, the closing stage of a day-night ODI or a 7:00 pm T20I. "Dew-risk evenings" counts the evenings where the spread was 4°C or less.
| Venue | Match | 10 pm humidity | 10 pm dew-point gap | Dew-risk evenings |
|---|---|---|---|---|
| Visakhapatnam | ODI · 13 Dec | 84% | 2.8°C | 80% |
| Bengaluru | ODI · 16 Dec | 84% | 2.8°C | 73% |
| Ahmedabad | ODI · 19 Dec | 52% | 10.5°C | 0% |
| Rajkot | T20I · 22 Dec | 53% | 10.4°C | 3% |
| Cuttack | T20I · 24 Dec | 86% | 2.4°C | 87% |
| Pune | T20I · 27 Dec | 67% | 6.5°C | 24% |
| Kolkata | ODI · 3 Jan | 80% | 3.5°C | 65% |
| Hyderabad | ODI · 6 Jan | 67% | 6.4°C | 21% |
| Mumbai | ODI · 9 Jan | 67% | 6.8°C | 23% |
How to read this. Reanalysis is modelled on a grid of roughly 25–30 km, so it describes the area, not the outfield itself. Treat these numbers as a guide to how likely dew is, not a measurement. A high share does not guarantee dew on the night, and a low share does not rule it out.
What it means for fantasy picks (general view)
At high-signal venues (the humid coastal and eastern grounds in this table) we lean towards:
- batters from the chasing side,
- seamers from the side bowling first, while the ball is still dry,
- caution with finger spinners who bowl in the second innings.
At low-signal venues (the dry inland grounds) the toss is less decisive. Spinners in both innings stay in play, and pitch reports matter more than dew forecasts.
On the day, check the toss: a captain who chooses to bowl first and mentions dew is giving you useful information.
FAQ
Why does dew help the team batting second?
A wet ball is harder to grip and skids on rather than gripping the surface. Spinners struggle to turn it and seamers struggle to bowl cutters and slower balls, so batting usually gets easier later in the evening.
Can you predict dew exactly?
No. Dew forms on the grass, and grass can cool below the air temperature on clear, calm nights. Weather data gives a useful indicator, but ground staff treatment, cloud and wind all change what happens on the night.
What is the dew-point spread?
The gap between the air temperature and the dew-point temperature. The smaller the gap, the closer the air is to saturation and the more likely dew becomes as surfaces cool.