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Select the parameter (dew point, temperature, or relative humidity) and enter the required values. The tool will instantly calculate the result.
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Estimate the highest temperature at which dew is expected to form using this free online dew point calculator. You can also explore the relationship between temperature, dew point, and relative humidity with our humidity calculator. Let’s dive deeper into the science of dew formation below.
“The dew point is the temperature at which water vapor begins to condense into liquid.”
You can calculate dew point temperature using the Magnus-Tetens formula:
Ts = (b × α(T,RH)) / (a - α(T,RH))
Where:
α(T,RH) = ln(RH/100) + aT/(b+T)
This formula highlights that calculating dew point requires knowing the relative and absolute humidities.
Relative humidity (RH) is the ratio of current moisture in the air to the maximum moisture the air can hold at a specific temperature.
Relative Humidity = 100% × Current Absolute Humidity / Maximum Absolute Humidity
Alternatively, it can be calculated using water vapor pressures:
Relative Humidity = 100% × Pw / Pws
Absolute humidity represents the actual amount of water present in the air, regardless of temperature.
Absolute Humidity = m / V
Condensation is the process by which water vapor turns back into liquid form.
The frost point is the temperature at which dew forms on icy surfaces instead of liquid water.
Below is a dew point chart showing typical relative humidity levels at 32°C (90°F):
| Dew Point | Relative Humidity at 32°C (90°F) | |
| Over 26°C | Over 80°F | 73% and higher |
| 24–26°C | 75–80°F | 62–72% |
| 21–24°C | 70–74°F | 52–61% |
| 18–21°C | 65–69°F | 44–51% |
| 16–18°C | 60–64°F | 37–43% |
| 13–16°C | 55–59°F | 31–36% |
| 10–12°C | 50–54°F | 26–30% |
| Under 10°C | Under 50°F | 25% and lower |
Helps prevent carburetor icing by monitoring moisture and fog conditions.
Maintains humidity to prevent leaf burn and ecosystem damage.
Controls gas generation and usage by regulating humidity and temperature.
Ensures proper sterilization and maintains composition integrity of medicines.
Dew typically forms up to 0.5–0.8 mm per night.
In some regions, dew is the main water source for plants.
Excess water from plant leaves forms droplets enriched in potassium and sugars; these are not dew.
| Dew Point | Comfort Level |
| <50°F (<10°C) | A bit dry |
| 50–60°F (10–16°C) | Dry and comfortable |
| 60–65°F (16–18°C) | Getting sticky |
| 65–70°F (18–21°C) | Unpleasant, lots of moisture |
| >70°F (>21°C) | Uncomfortable, oppressive, potentially dangerous above 75°F |
Use charts, calculators, or theoretical formulas. Examples:
Example 1: T = 32°C, RH = 77%
α = ln(77/100) + 17.62*32/(243.12+32) = -0.2613 + 2.049 = 1.7877
Ts = 243.12*1.7877 / (17.62 - 1.7877) ≈ 27°C
Example 2: Absolute humidity = 34%, Max = 56%
RH = 100% * 34/56 = 60.71%
The highest dew point possible is 95°F, as confirmed by our calculator.
Dew points under 50°F are dry; 50–60°F comfortable; above 70°F feels oppressive.
Dew points above 60°F in the morning indicate higher chances of heavy rainfall.
Humid air can affect airways, triggering irritation or asthma in severe cases.
Dew point measurements help meteorologists assess atmospheric moisture and forecast weather accurately. The free dew point calculator simplifies estimating dew points and relative humidity for safer, more comfortable conditions.
Wikipedia: Dew point, ScienceDirect: Dew point, Mesonet: Dewpoint Temperature
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