Weather at West Boothbay Harbor

Current Conditions

Larger WebCam Image | NOAA Weather Forecast | Tide Predictions | Mariner's Weather

NEW: Weather Forecast specific to the peninsulas and islands of Maine's midcoast region (since our weather is often a bit different from that inland) -- go to: NWS Gray Maine Recreational Forecast and look for "ISLANDS AND NECKS OF THE MID COAST OF MAINE"

The Past 24 Hours...

For explanations of the data shown in these graphs, see the Notes below.

24 Hour Wind Speed and Direction Record

24 Hour Temperature and Humidity Record

24 Hour Rainfall Rate

Hourly Rainfall Totals for the last 24 Hours

24 Hour Solar Radiation and UV Record

24 Hour Barometric Pressure Record

4 Week Wind Speed Record

4 Week Wind Direction Record

4 Week Temperature Record

4 Week Rainfall Record

4 Week Solar Radiation Record

4 Week Barometric Pressure Record


The 24-hour graphs represent data compiled over 5-minute intervals, and the graphs are updated every five to fifteen minutes (depending on the graph) -- but you need to manually refresh your browser to see the latest. For the 4-week graphs, the data is compiled over 1 hour intervals, and the graphs are updated every 12 hours.


The wind charts show the wind speed (average and gusts), and the direction the wind is blowing from. The wind speed is reported in knots, or nautical miles per hour. The top of the scale on the graph is set at 34 knots, which is the transition to Gale force winds. If we are experiencing Gale or Storm force winds, we have another chart with an expanded scale. But even that one doesn't get into Hurricane force; hopefully we'll never see winds that strong! It should be noted that our anemometer is not really in an optimum position (i.e., it's not high enough off the ground) to give a full picture of the true force of the wind, and where it is located, it is shielded somewhat for winds from the south to northwest directions; it is more adequately exposed for winds from the north and east directions.


The temperature graphs shows the air temperature (red line), dew point temperature (green line), and relative humidity (purple line), at the Harborfields dock. The dew point temperature is an indicator of how much water vapor is in the air. The relative humidity is related to the difference between actual air temperature and dew point temperature - the larger the difference, the relatively drier the air. At 100% humidity, the actual air temperature and the dew point temperature will be the same. As the actual air temperature rises and falls over time, you will see the relative humidity change even if the dew point temperature is not changing very much. The dew point temperature is also an indicator of the overnight low temperature that we might expect on a clear night with little wind.

Sea Surface Temperatures

Unfortunately, we do not have any automated sensors at our dock reporting the water temperature. However, a prospective guest once asked about the water temperatures in early August, for their kids swimming. Off the top of my head, I said probably about 65 degrees F, possibly as warm as 70.

But we can do better than that! The Maine Department of Marine Resources has been measuring the water temperature here in West Boothbay Harbor almost every day since 1905! We have compiled the most recent ten years of that data into the following graph:

10-Year Daily Average Sea Surface Temperatures,
Harborfields Cottages, West Boothbay Harbor, Maine (data from DMR)

So what does this tell us? In early August the water temperatures are .... about 65F, possibly as warm as 70!


Rain is measured with a "tipping bucket" that sends a signal for each small bucketfull of rain that is collected (it doesn't work for snow or other frozen or freezing precipitation... It also doesn't do well collecting rain that is not falling vertically such as when the wind is really blowing). Knowing the volume of each small bucketfull, the system can calculate the rate at which it is raining by counting how many times the buckets tip each minute, and can add up the total rainfall over some period of time from the total count of how many times the bucket has tipped. For the 24-hour graphs we show rainfall rate per minute, averaged over 5 minutes, and hourly rainfall totals. If the rain is steady, there should be a good correlation between the hourly total and the rainfall rate. For the four-week graph, we show daily rainfall totals.


The barometric pressure is recorded by the weather console in the Harborfields office, which is located about 55 feet or so above sea level, so the corrected value is the calculated pressure at sea level.

Solar Radiation

Is the sun shining? How strong is it? The solar radiometer might tell you whether it is day or night, clear or cloudy. If the solar gain is low and the humidity is high, we may be experiencing fog! But you could also just check the Web Cam! Note that UV can be strong even on cloudy or foggy days! Also note that the weather station falls in the shadow of some trees at a certain point in the afternoon... when that happens you'll see a sudden drop-off in the radiometer signal.

System Failures and Missing Data

For some unknown reason, sometimes our sensor unit stop sending some data to the console (the outside humidity and the solar radiation sensors are particularly prone to this), leading to blank graphs or gaps in the graphs. What ever the problem is, it eventually spontaneously self-corrects. Also, the weather hub computer that is pumping the data out to the internet sometimes mysteriously stops functioning; powering it off and back on re-boots it. We try to stay on top of these things, but we can't always fix whatever the problems are right away ... Sorry! These data are provided for entertainment and information only, and should not be relied upon for anything critical.

Home Harborfields Waterfront Vacation Cottages
PO Box 524
West Boothbay Harbor, Maine 04575
207-633-5082 June 2016
© 2016 Harborfields, Inc.