Portsmouth Intl
Weather station · 43.1°N 70.8°W · 34 m above sea level
ICAO KPSMStation data since 1956
Record high
32.2°C
in 1965
Record low
3.3°C
in 1963
Average high
21.4°C
all years on record
20.9°C short of the record for 23 September
Today’s high 11.3°C against 32.2°C in 1965. A reading that beats it is flagged here automatically, once a second cycle confirms it.
All-time record high
38.3°C
- Date
- Wednesday, 1 July 1964
- Time of day
- Not recorded. The daily archive stores the day, not the hour.
- Location
- Portsmouth Intl, United States
- Position
- 43.07°N 70.81°W · 34 m
Highest highest in available records since 1956. Source: NOAA GHCN-Daily.
All-time record low
−26.7°C
- Date
- Tuesday, 15 January 1957
- Time of day
- Not recorded. The daily archive stores the day, not the hour.
- Location
- Portsmouth Intl, United States
- Position
- 43.07°N 70.81°W · 34 m
Highest and lowest lowest in available records since 1956. Source: NOAA GHCN-Daily.
Where Portsmouth Intl is
43.07°N 70.81°W
Every year on record
1956 to 2026
Annual average · °C
Trend over 15 years with data: +0.18 °C per decade
Source: NOAA GHCN-Daily. Years the station did not cover are left as gaps, never joined across. The dashed line is a least squares trend through the years that have data.
Records by month
Jan
14.4°
−26.7°
Feb
18.9°
−22.8°
Mar
23.9°
−17.8°
Apr
32.2°
−7.8°
May
37.2°
−1.7°
Jun
38.0°
5.6°
Jul
38.3°
8.3°
Aug
35.0°
4.4°
Sep
34.4°
Recent days
| Day | High | At | Low | At |
|---|---|---|---|---|
| 2026-09-23 | 11.3°C | 00:55 UTC | 7.3°C | 06:55 UTC |
| 2026-09-22 | 18.0°C | 14:55 UTC | 13.8°C | 22:55 UTC |
Nearby stations
Data sources for this page
| Figure | Source | Type |
|---|---|---|
| Right now, today so far | NOAA Aviation Weather Center (METAR) and NOAA NWS WMO bulletins (SYNOP) | Measured, station |
| All-time, monthly and on-this-day records | NOAA NCEI Global Historical Climatology Network daily (GHCN-Daily), 1956 to 2026 | Measured, station |
| Nearby stations and distances | Computed from station positions in our own database | Calculated |
