Live conditions in the salt marsh at Biddeford Pool, Maine · UNE salt-marsh water and weather station
🕒 Latest reading: Wednesday, Oct 21 2026 at 06:30 PM. Tap ⓘ on any box to learn what it means.
This station is highlighted in orange. Hover over any other icon for its name, or click it to visit UNE's nearby buoys and stations.
Written automatically from the numbers — it changes as new data arrives.
Warmest 95 °F (35.3 °C) on Jul 2 at 5:50 PM; coldest -4 °F (-20.3 °C) on Jan 31 at 3:45 AM.
From -4.1 ft (-1.24 m) to 7.7 ft (2.35 m) relative to the sensor’s reference level. Highest on Dec 07, 2025.
Warmest Aug 8 at 3:05 PM; coldest Jan 21 at 6:55 AM. Follows the air when the marsh drains at low tide.
A quick guide to each measurement on this page — no science degree needed.
What it is: The height of the water surface. Along the Maine coast the sea rises and falls about 9 feet twice a day (every ~12 h 25 min), pulled by the Moon and Sun.
Why it matters: The tide moves water — and everything in it — back and forth past a sensor, so many readings change with the tide. In marshes and ponds, water level shows how often the tide floods in and how high storms push it.
📏 Heights on tide charts are measured above average low tide (MLLW). Storms and strong onshore winds can push water higher than predicted.
📍 Here: typically 0.8 ft; -4.1 ft to 7.7 ft so far.
What it is: How warm or cold the water is, measured by a sensor just below the surface.
Why it matters: Temperature controls almost everything in the water: how much oxygen it can hold, how fast algae grow, which fish and shellfish are comfortable, and when lobsters and other animals move or molt.
📏 Gulf of Maine coastal water runs roughly 38–45 °F (3–7 °C) in late winter and 60–68 °F (15–20 °C) in late summer. Shallow ponds and marshes swing much more, warming fast on sunny days.
📍 Here: typically 52 °F; 24 °F to 88 °F so far.
What it is: How warm the air is, measured in a shaded, ventilated shield about 2 m (6 ft) above the ground.
Why it matters: It sets the weather we feel, and it warms or cools the water and soil around it.
📏 Coastal stations stay milder than inland ones — cooler on summer afternoons, warmer on winter nights.
📍 Here: typically 50 °F; -4 °F to 95 °F so far.
What it is: The temperature the air would have to cool to for dew or fog to form. Unlike humidity, it does not change just because the air warms up during the day.
Why it matters: It is the best measure of how muggy it feels and when fog will form.
📏 Dew point above ~65 °F (18 °C): sticky. Below ~50 °F (10 °C): crisp. When air temperature falls to the dew point, fog forms.
📍 Here: typically 44 °F; -14 °F to 78 °F so far.
What it is: How much water vapour is in the air compared with the most it could hold at that temperature.
Why it matters: High humidity feels muggy, means fog and dew are likely, and slows evaporation.
📏 100% means the air is saturated — fog, dew or rain.
📍 Here: typically 78%; 27% to 100% so far.
What it is: The weight of the air above, in hPa (hectopascals) or kPa (1 kPa = 10 hPa).
Why it matters: Falling pressure usually means a storm or front is coming; rising pressure means clearing weather. Very low pressure also lets the sea rise a little higher (storm surge).
📏 ~1013 hPa (101.3 kPa) is average. Under ~1000 hPa usually means a storm.
📍 Here: typically 101.7 kPa; 98.7 kPa to 104.2 kPa so far.
All measurements on one shared timeline. Use the buttons to zoom to the last day, week or month, or drag across any panel. Click a name in the legend to hide or show it.
Each day's range (shaded) and average (line); bars are daily totals.
Averages, lows and highs for each month (newest first).
| Month | Days | Water level avg | low | high | Water temperature avg | low | high | Air temperature avg | low | high | Dew point avg | Humidity avg | Air pressure avg |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Oct 2026 | 21/31 | 0.21 m | -0.57 m | 1.53 m | 13.7 °C | 4.8 °C | 27.5 °C | 11.9 °C | -1.8 °C | 26.2 °C | 7.8 °C | 78 % | 102.1 kPa |
| Sep 2026 | 30/30 | 0.34 m | -0.49 m | 1.74 m | 17.5 °C | 10.8 °C | 27.8 °C | 16.4 °C | 6.0 °C | 29.2 °C | 12.9 °C | 82 % | 102.1 kPa |
| Aug 2026 | 31/31 | -0.27 m | -1.24 m | 1.47 m | 20.7 °C | 16.0 °C | 31.2 °C | 20.9 °C | 13.2 °C | 32.1 °C | 17.6 °C | 83 % | 101.7 kPa |
| Jul 2026 | 31/31 | 0.03 m | -1.12 m | 1.67 m | 20.0 °C | 14.3 °C | 29.3 °C | 21.1 °C | 9.3 °C | 35.3 °C | 16.6 °C | 77 % | 101.5 kPa |
| Jun 2026 | 30/30 | 0.08 m | -0.75 m | 1.88 m | 17.5 °C | 10.7 °C | 28.6 °C | 18.2 °C | 5.4 °C | 30.0 °C | 14.4 °C | 80 % | 101.4 kPa |
| May 2026 | 31/31 | 0.32 m | -0.59 m | 1.80 m | 12.4 °C | 6.0 °C | 24.7 °C | 13.0 °C | 2.0 °C | 33.8 °C | 7.8 °C | 74 % | 101.7 kPa |
| Apr 2026 | 28/30 | 0.55 m | -0.03 m | 2.02 m | 7.7 °C | 0.8 °C | 16.8 °C | 6.5 °C | -2.9 °C | 18.5 °C | 2.7 °C | 79 % | 102.2 kPa |
| Mar 2026 | 31/31 | 0.63 m | 0.07 m | 2.16 m | 3.5 °C | -3.8 °C | 14.7 °C | 2.4 °C | -13.3 °C | 19.6 °C | -2.1 °C | 74 % | 102.1 kPa |
| Feb 2026 | 28/28 | 0.68 m | 0.09 m | 2.17 m | -0.1 °C | -3.5 °C | 5.8 °C | -3.3 °C | -14.9 °C | 10.8 °C | -8.3 °C | 70 % | 101.6 kPa |
| Jan 2026 | 31/31 | 0.65 m | 0.04 m | 2.32 m | 0.4 °C | -4.6 °C | 8.0 °C | -4.4 °C | -20.3 °C | 11.7 °C | -8.5 °C | 74 % | 101.6 kPa |
| Dec 2025 | 31/31 | 0.64 m | 0.03 m | 2.35 m | 1.4 °C | -4.4 °C | 10.9 °C | -2.3 °C | -15.0 °C | 11.1 °C | -7.5 °C | 69 % | 101.6 kPa |
=IMPORTDATA("https://ekelting.github.io/UNE-Marine-Monitoring-Network/biddeford-pool-marsh/data/daily.csv")