This guide describes Dehradun's historical climate, not a live 15-day forecast. Monthly averages help compare seasons but cannot predict an individual day. Forecast uncertainty generally increases with lead time and depends on the location and weather variable. See the current seven-day forecast for upcoming weather.
What is normal in Dehradun, month by month
| Month | Max | Min | Rain | Rain days |
|---|---|---|---|---|
| January | 17.1° | 4.6° | 43.6 mm | 5.1 |
| February | 20° | 6.8° | 56.6 mm | 5.9 |
| March | 25.1° | 10.7° | 40.7 mm | 5.6 |
| April | 30.7° | 15.5° | 24.7 mm | 4.8 |
| May | 33.6° | 19.4° | 35.8 mm | 7.7 |
| June | 32.8° | 22.2° | 134.2 mm | 13.8 |
| July | 29° | 23° | 416 mm | 28.3 |
| August | 28.4° | 22.5° | 404.2 mm | 28.1 |
| September | 28° | 20.1° | 171 mm | 17.7 |
| October | 26.7° | 14.6° | 18.1 mm | 2.6 |
| November | 22.8° | 9.9° | 4.3 mm | 1 |
| December | 19° | 6.1° | 12.1 mm | 2 |
83% of Dehradun's 1361 mm falls between June and September, so during those four months a 15-day view is useful for spotting when the next wet spell is due, not for how much rain falls on a given day. The dry half of the year is not completely dry here: 24 rain days and 182 mm between November and April, enough that a two-week view is still worth checking for rain outside the monsoon.
How much a fortnight can tell you in Dehradun
The wet season arrives here as a wall. July brings about 11.6 times the rain of May, so through late spring a 15-day outlook is answering one question rather than many: which side of that change you are on. Once it has happened, the day-to-day amount matters more than the trend.
The other thing worth knowing before reading a two-week forecast here is how far the year swings: 29°C between the hottest monthly average maximum and the coldest average minimum. The fastest change is into April, when the average daily maximum moves 5.6°C in a single month - and a forecast crossing that point is doing more work than one in a settled month.
The two turning points in the year
The biggest turn in Dehradun's year is the monsoon. Over 34 years the first sustained rain arrives around 18 June, and between 11 June and 26 June in half of years. If you are looking at a 15-day forecast in mid-June, that is the real question you are asking.
The other turn is heat: May averages a daily maximum of 33.6°C, and that falls by 4.6°C once the monsoon is established.
When the monsoon reaches Dehradun — the full record
Sources
Source: Open-Meteo's historical weather archive, whose default model blends ERA5 and ERA5-Land reanalysis with ECMWF IFS HRES from 2017 — 1991-2024 (34 years). Open-Meteo offers no rainfall from ERA5-Land, so the rain figures come from ERA5 and IFS. Temperatures are monthly averages of daily highs and lows; rainfall is the average monthly total. A grid estimate can differ from a local weather station.
The live forecast for Dehradun is on a separate page and comes from Open-Meteo, which is built on ECMWF and other models.