Weather Impact Calculator
Estimate weather-related delays based on location and project duration. Calculate recommended contingency days for weather-sensitive activities.
Enter weather conditions to assess construction impact
REFERENCE INFORMATION
This tool provides standard reference data compiled from industry sources.
Note:
• Data is provided for quick reference and may not reflect the most current standards or specifications.
About This Calculator
The Weather Impact Calculator helps planners and project managers estimate weather-related delays for construction projects across the UAE and Gulf. Calculate recommended contingency days based on location, project duration, and weather-sensitive activities. Essential for realistic scheduling, tender contingency planning, and Extension of Time (EOT) claim substantiation in the Gulf's extreme summer climate.
When to Use This Calculator
- Planning project schedules with realistic weather contingency
- Preparing baseline programs that account for summer restrictions
- Calculating contingency days for tender submissions
- Substantiating Extension of Time claims for weather delays
- Identifying weather-sensitive activities for risk planning
How to Use This Calculator
Select Work Type
Choose the activity: concrete, steel erection, waterproofing, painting/finishing, excavation, or general construction.
Enter Weather Conditions
Input air temperature, relative humidity, wind speed and the expected condition (clear, light rain, heavy rain, sandstorm, extreme heat).
Enter Duration and Crew
Input the planned activity duration in days and the crew size.
Check Summer Restrictions
Between 15 June and 15 September, the MOHRE midday break stops outdoor work under direct sun from 12:30 to 15:00. Plan shifts around it.
Review Impact
Get the productivity impact, adjusted duration, heat index and safety recommendations.
Typical Scenarios in UAE & Gulf Projects
A 30-day concrete activity in July with 42°C air temperature, 55% humidity and light wind. The calculator gives a heat index of about 66°C, a 23% productivity impact and an adjusted duration of 37 days, and flags the MOHRE midday break (12:30–15:00, 15 June–15 September) and heat-stress controls.
A 30-day steel erection activity at 38°C, 40% humidity and 40 km/h wind. The calculator gives a 32% productivity impact and an adjusted duration of 40 days, and flags that crane lifts should stop above 35 km/h wind speed.
Frequently Asked Questions
Take Your Calculations Further
This calculator reflects the logic built into Arkan's construction management platform.
Last Updated: January 2026
Standards Reference: UAE Ministry of Human Resources and Emiratisation midday break rules, FIDIC 1999 Red Book Sub-Clause 8.4(c) exceptionally adverse climatic conditions (2017 edition Sub-Clause 8.5(c))