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Search for a site to see weather ratings for bat, amphibian, reptile, bird, butterfly and water vole surveys.
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Dot shows today's ratingNext 16 days
Forecast · tap a day for details30-day planner
Days 1–16 from the forecast; days 17–30 from the last 5 years at this locationAll surveys at a glance
Next 14 days · tap a squareHow ratings work
Each day is rated against the weather limits in the guidance below, using hourly forecasts for the survey window (for example sunset to two hours after for bat emergence surveys). Go means every check passes, Marginal means at least one is borderline, so use your judgement and record the conditions, and No-go means at least one check fails. Days outside the survey season are shown as Out of season.
Thresholds and sources
Limitations
This is a planning aid, not a substitute for professional judgement or the full guidance. Forecasts are for a ~1–11 km model grid square and can differ from site conditions, especially at exposed, upland, coastal or sheltered sites. Always record actual conditions at the start and end of each survey. Where guidance gives no number (for example “strong wind” or “warm”), the value used here is stated in the table. Outlook days (17–30) show how often conditions met the criteria on those dates in the last five years. They are not a forecast.
Weather: the first 7 days use the UK Met Office models (UKV 2 km for about 2 days, then the Met Office Global 10 km model), and days 8–16 use the Open-Meteo best-match blend (led by DWD ICON), all via Open-Meteo (CC BY 4.0). The 5-year outlook uses ERA5 reanalysis from the Open-Meteo historical archive. Postcodes and places: postcodes.io (contains OS and Royal Mail data © Crown copyright and database right). Map © OpenStreetMap contributors. Sun times calculated in your browser. All times are UK local time.